Siemens S7-200PLC Specifications

Important Notes, Contents
SIMATIC
S7-200 Programmable Controller
System Manual
This manual has the order number:
6ES7298-8FA20-8BH0
Introducing the S7-200
Micro PLC
Installing an S7-200 Micro
PLC
Getting Started with an
S7-200 Programming
System
Basic Concepts for
Programming an S7-200
CPU
1
CPU Memory: Data Types
and Addressing Modes
5
CPU and Input/Output
Configuration
Setting Up Communications
Hardware and Network
Communications
6
Conventions for S7-200
Instructions
8
SIMATIC Instructions
IEC 1131-3 Instructions
S7-200 Specifications
Error Codes
Special Memory (SM) Bits
S7-200 Troubleshooting
Guide
3
4
7
9
10
A
B
C
Execution Times for STL
Instructions
D
E
F
S7-200 Quick Reference
Information
G
S7-200 Order Numbers
03/99
Release 01
2
Index
Safety Guidelines
This manual contains notices which you should observe to ensure your own personal safety, as well as to
protect the product and connected equipment. These notices are highlighted in the manual by a warning
triangle and are marked as follows according to the level of danger:
!
Danger
indicates that death, severe personal injury, or substantial property damage will result if proper
precautions are not taken.
!
Warning
indicates that death, severe personal injury, or substantial property damage can result if proper
precautions are not taken.
!
Caution
indicates that minor personal injury or property damage can result if proper precautions are not taken.
Qualified Personnel
The device/system may only be set up and operated in conjunction with this manual. Only qualified
personnel should be allowed to install and work on this equipment. Qualified persons are defined as
persons who are authorized to commission, to ground, and to tag circuits, equipment, and systems in
accordance with established safety practices and standards.
Correct Usage
Note the following:
!
Warning
This device and its components may only be used for the applications described in the catalog or the
technical description, and only in connection with devices or components from other manufacturers which
have been approved or recommended by Siemens.
This product can only function correctly and safely if it is transported, stored, set up, and installed
correctly, and operated and maintained as recommended.
Trademarks
SiemensRand SIMATICR are registered trademarks of SIEMENS AG.
STEP 7  and S7 are trademarks of SIEMENS AG.
MicrosoftR, WindowsR, Windows 95R, Windows 98R, and Windows NTR are registered trademarks of
Microsoft Corporation.
Underwriters LaboratoriesR is a registered trademark of Underwriters Laboratories, Inc.
Copyright Siemens AG 1999 All rights reserved
Disclaimer of Liability
The reproduction, transmission or use of this document or its contents is not
permitted without express written authority. Offenders will be liable for
damages. All rights, including rights created by patent grant or registration of
a utility model or design, are reserved.
We have checked the contents of this manual for agreement with the
hardware and software described. Since deviations cannot be precluded
entirely, we cannot guarantee full agreement. However, the data in this
manual are reviewed regularly and any necessary corrections included in
subsequent editions. Suggestions for improvement are welcomed.
Siemens AG
Bereich Automatisierungs- und Antriebstechnik
Geschaeftsgebiet Industrie-Automatisierungssysteme
Postfach 4848, D-90327 Nuernberg
Index-2
Siemens Aktiengesellschaft
E Siemens AG 1999
Technical
datamanual
subject to change.
S7-200 Programmable Controller System Manual
This
has
C79000-G7076-C233
the order number:
C79000-G7076-C233
Important Notes
Purpose
The S7-200 series is a line of micro-programmable logic controllers (Micro PLCs)
that can control a variety of automation applications. Compact design, low cost,
and a powerful instruction set make the S7-200 controllers a perfect solution for
controlling small applications. The wide variety of CPU sizes and voltages, and the
windows-based programming tool, give you the flexibility you need to solve your
automation problems.
The S7-200 product line has been redesigned to be smaller, faster, and to have
increased functionality. The new S7-200 products are intended to replace the
previous products.
This manual provides information about installing and programming the S7-200
Micro PLCs. The S7-200 Programmable Controller System Manual includes the
following topics:
Installing and wiring
Understanding the CPU operations, data types and addressing modes, scan
cycle, password protection, and network communication
Specifications
Descriptions of and examples for the SIMATIC and IEC 1131-3 programming
instructions
Typical execution times for SIMATIC STL instructions
Audience
This manual is designed for engineers, programmers, installers, and electricians
who have a general knowledge of programmable logic controllers.
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
iii
Important Notes
Scope of the Manual
The information contained in this manual pertains in particular to the following
products:
S7-200 CPU models: CPU 221, CPU 222, and CPU 224
STEP 7-Micro/WIN 32, version 3.0, a 32-bit programming software package for
Windows 95, Windows 98, and the Windows NT environment
Agency Approvals
The SIMATIC S7-200 series meets the following regulations:
European Community (CE) Low Voltage Directive 73/23/EEC
European Community (CE) EMC Directive 89/336/EEC
Underwriters Laboratories, Inc.: UL 508 Listed (Industrial Control Equipment)
Canadian Standards Association: CSA C22.2 Number 142 Certified (Process
Control Equipment)
Factory Mutual Research: FM Class I, Division 2, Groups A, B, C, & D
Hazardous Locations, T4A
Refer to Appendix A for compliance information.
Related Information
Refer to the following for more detailed information about selected topics:
STEP 7-Micro/WIN 32 CD/disk: provides online help, the STEP 7-Micro/WIN
Getting Started (a printable online manual).
Process Field Bus (PROFIBUS) standard (EN 50170): describes the standard
protocol for the S7-200 DP communication capability.
TD 200 Operator Interface User Manual: describes how to install and use the
TD 200 with an S7-200 programmable logic controller.
iv
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Important Notes
How to Use This Manual
If you are a first-time (novice) user of S7-200 Micro PLCs, you should read the
entire S7-200 Programmable Controller System Manual. If you are an experienced
user, refer to the manual table of contents or index to find specific information.
The S7-200 Programmable Controller System Manual is organized according to
the following topics:
“Introducing the S7-200 Micro PLC” (Chapter 1) provides an overview of some
of the features of the equipment.
“Installing an S7-200 Micro PLC” (Chapter 2) provides procedures, dimensions,
and basic guidelines for installing the S7-200 CPU modules and expansion I/O
modules.
“Getting Started with an S7-200 Programming System” (Chapter 3) describes
how to set up an S7-200 programming system.
“Basic Concepts for Programming an S7-200 CPU” (Chapter 4), “CPU Memory:
Data Types and Addressing Modes” (Chapter 5), and “CPU and Input/Output
Control” (Chapter 6) provide information about how the S7-200 CPU processes
data and executes your program.
“Setting Up Communications Hardware and Network Communications”
(Chapter 7) provides information about how to install and remove
communications hardware and how to connect the S7-200 CPU to different
types of networks.
“Conventions for S7-200 Instructions” (Chapter 8) provides an overview of the
different programming language concepts and terminology.
Descriptions and examples of SIMATIC LAD, FBD, and STL programming
instructions are provided in Chapter 9.
Descriptions and examples of IEC 1131-3 LAD and FBD programming
instructions are provided in Chapter 10.
Additional information (such as the equipment specifications, error code
descriptions, troubleshooting, and STL instruction execution times) are provided in
the appendices.
Additional Assistance
For assistance in answering technical questions, for training on this product, or for
ordering, contact your Siemens distributor or sales office.
For Internet information about Siemens products and services, technical support,
or FAQs (frequently asked questions) and application tips, use the following
Internet addresses:
http://www.ad.siemens.de
http://www.siemens.com/s7-200
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
for general Siemens information
for S7-200 product information
v
Important Notes
vi
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Contents
1
2
3
4
Introducing the S7-200 Micro PLC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-1
1.1
Comparing the Features of the S7-200 Micro PLCs . . . . . . . . . . . . . . . . . .
1-2
1.2
Major Components of the S7-200 Micro PLC . . . . . . . . . . . . . . . . . . . . . . . .
1-4
Installing an S7-200 PLC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-1
2.1
Panel Layout Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-2
2.2
Installing and Removing an S7-200 Micro PLC or Expansion Module . . .
2-6
2.3
Installing the Field Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-9
2.4
Using Suppression Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-16
2.5
Power Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-18
Getting Started with an S7-200 Programming System . . . . . . . . . . . . . . . . . . . . .
3-1
3.1
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-2
3.2
Quick Start for STEP 7-Micro/WIN 32 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3-3
3.3
How Do I Set Up Communications Using the PC/PPI Cable? . . . . . . . . . .
3-5
3.4
How Do I Go Online With the S7-200 CPU? . . . . . . . . . . . . . . . . . . . . . . . . .
3-9
3.5
How Do I Change the Communications Parameters for My PLC? . . . . . .
3-10
Basic Concepts for Programming an S7-200 CPU . . . . . . . . . . . . . . . . . . . . . . . . .
4-1
4.1
Guidelines for Designing a Micro PLC System . . . . . . . . . . . . . . . . . . . . . . .
4-2
4.2
Concepts of an S7-200 Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-5
4.3
Concepts of the S7-200 Programming Languages and Editors . . . . . . . . .
4-6
4.4
Understanding the Differences between SIMATIC and
IEC 1131-3 Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-10
4.5
Basic Elements for Constructing a Program . . . . . . . . . . . . . . . . . . . . . . . . .
4-18
4.6
Understanding the Scan Cycle of the CPU . . . . . . . . . . . . . . . . . . . . . . . . . .
4-22
4.7
Selecting the Mode of Operation for the CPU . . . . . . . . . . . . . . . . . . . . . . .
4-25
4.8
Creating a Password for the CPU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-27
4.9
Debugging and Monitoring Your Program . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-30
4.10
Error Handling for the S7-200 CPU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-36
S7-200 Programmable Controller System Manual
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vii
Contents
5
6
7
8
viii
CPU Memory: Data Types and Addressing Modes . . . . . . . . . . . . . . . . . . . . . . . .
5-1
5.1
Direct Addressing of the CPU Memory Areas . . . . . . . . . . . . . . . . . . . . . . .
5-2
5.2
SIMATIC Indirect Addressing of the CPU Memory Areas . . . . . . . . . . . . . .
5-13
5.3
Memory Retention for the S7-200 CPU . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5-15
5.4
Using Your Program to Store Data Permanently . . . . . . . . . . . . . . . . . . . . .
5-20
5.5
Using a Memory Cartridge to Store Your Program . . . . . . . . . . . . . . . . . . .
5-22
CPU and Input/Output Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-1
6.1
Local I/O and Expansion I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-2
6.2
Using the Selectable Input Filter to Provide Noise Rejection . . . . . . . . . . .
6-4
6.3
Pulse Catch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-5
6.4
Using the Output Table to Configure the States of the Outputs . . . . . . . . .
6-8
6.5
Analog Input Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-9
6.6
High-Speed I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-10
6.7
Analog Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-13
Setting Up Communications Hardware and Network Communications . . . . . .
7-1
7.1
What Are My Communication Choices? . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7-2
7.2
Installing and Removing Communication Interfaces . . . . . . . . . . . . . . . . . .
7-7
7.3
Selecting and Changing Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7-9
7.4
Communicating With Modems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7-16
7.5
Network Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7-27
7.6
Network Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7-31
7.7
Using the PC/PPI Cable with Other Devices and Freeport . . . . . . . . . . . .
7-35
7.8
Network Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7-41
Conventions for S7-200 Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8-1
8.1
Concepts and Conventions For STEP 7-Micro/WIN 32 Programming . . .
8-2
8.2
Valid Ranges for the S7-200 CPUs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8-7
S7-200 Programmable Controller System Manual
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Contents
9
10
SIMATIC Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9-1
9.1
SIMATIC Bit Logic Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9-2
9.2
SIMATIC Compare Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9-10
9.3
SIMATIC Timer Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9-15
9.4
SIMATIC Counter Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9-23
9.5
SIMATIC High-Speed Counter Instructions . . . . . . . . . . . . . . . . . . . . . . . . . .
9-27
9.6
SIMATIC Pulse Output Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9-49
9.7
SIMATIC Clock Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9-70
9.8
SIMATIC Integer Math Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9-72
9.9
SIMATIC Real Math Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9-81
9.10
SIMATIC Move Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9-99
9.11
SIMATIC Table Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-104
9.12
SIMATIC Logical Operations Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-110
9.13
SIMATIC Shift and Rotate Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-116
9.14
SIMATIC Conversion Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-126
9.15
SIMATIC Program Control Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-141
9.16
SIMATIC Interrupt and Communications Instructions . . . . . . . . . . . . . . . . . 9-165
9.17
SIMATIC Logic Stack Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-192
IEC 1131-3 Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10-1
10.1
IEC Bit Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10-2
10.2
IEC Compare Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10-7
10.3
IEC Timer Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-11
10.4
IEC Counter Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-15
10.5
IEC Math Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-19
10.6
IEC Move Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-24
10.7
IEC Logic Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-26
10.8
IEC Shift and Rotate Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-29
10.9
IEC Conversion Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-32
S7-200 Programmable Controller System Manual
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ix
Contents
A
S7-200 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A-1
A.1
General Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A-2
A.2
Specifications for the CPU 221 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A-6
A.3
Specifications for the CPU 222 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A-11
A.4
Specifications for the CPU 224 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A-16
A.5
Specifications for the EM221 Digital Input Module . . . . . . . . . . . . . . . . . . . .
A-21
A.6
Specifications for the EM222 Digital Output Modules . . . . . . . . . . . . . . . . .
A-23
A.7
Specifications for the EM223 Digital Combination Modules,
8 Inputs/8 Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A-25
A.8
Optional Cartridges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A-28
A.9
I/O Expansion Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A-29
A.10
PC/PPI Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A-30
Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B-1
B.1
Fatal Error Codes and Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B-2
B.2
Run-Time Programming Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B-3
B.3
Compile Rule Violations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B-4
C
Special Memory (SM) Bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C-1
D
S7-200 Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D-1
E
S7-200 Order Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
E-1
F
Execution Times for STL Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
F-1
G
S7-200 Quick Reference Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
G-1
B
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Index-1
x
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Introducing the S7-200 Micro PLC
1
The S7-200 series is a line of micro-programmable logic controllers (Micro PLCs)
that can control a variety of automation applications. Figure 1-1 shows an S7-200
Micro PLC. The compact design, expandability, low cost, and powerful instruction
set of the S7-200 Micro PLC make a perfect solution for controlling small
applications. In addition, the wide variety of CPU sizes and voltages provides you
with the flexibility you need to solve your automation problems.
Figure 1-1
S7-200 Micro PLC
Chapter Overview
Section
Description
Page
1.1
Comparing the Features of the S7-200 Micro PLCs
1-2
1.2
Major Components of the S7-200 Micro PLC
1-4
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
1-1
Introducing the S7-200 Micro PLC
1.1
Comparing the Features of the S7-200 Micro PLCs
Equipment Requirements
Figure 1-2 shows the basic S7-200 Micro PLC system, which includes an S7-200
CPU, a personal computer, STEP 7-Micro/WIN 32, version 3.0 programming
software, and a communications cable.
In order to use a personal computer (PC), you must have one of the following:
A PC/PPI cable
A communications processor (CP) and multipoint interface (MPI) cable
A multipoint interface (MPI) card. A communications cable is provided with the
MPI card.
Computer
S7-200 CPU
STEP 7-Micro/WIN 32
PC/PPI Cable
Figure 1-2
Components of an S7-200 Micro PLC System
Capabilities of the S7-200 CPUs
The S7-200 family includes a wide variety of CPUs. This variety provides a range
of features to aid in designing a cost-effective automation solution. Table 1-1
provides a summary of the major features of the S7-200 CPUs.
1-2
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Introducing the S7-200 Micro PLC
Table 1-1
Summary of the S7-200 CPUs
CPU 221
Feature
CPU 222
CPU 224
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Physical Size of Unit
90 mm x 80 mm x
62 mm
90 mm x 80 mm x
62 mm
120.5 mm x 80 mm
x 62 mm
Program
2048 words
2048 words
4096 words
User data
1024 words
1024 words
2560 words
Memory type
EEPROM
EEPROM
EEPROM
Memory cartridge
EEPROM
EEPROM
EEPROM
Data backup (super capacitor)
50 hours typical
50 hours typical
190 hours typical
Local I/O
6 In/4 Out
8 In/6 Out
14 In/10 Out
Number of expansion modules
none
2 modules
7 modules
Digital I/O image size
256 (128 In/128 Out)
256 (128 In/128 Out)
256 (128 In/128 Out)
Digital I/O physical size
10
62
128
Analog I/O image size
none
16 In/16 Out
16 In/16 Out
Analog I/O physical size
none
12 In/10 Out
12 In/10 Out
Boolean execution speed
0.37 µs/instruction
0.37 µs/instruction
0.37 µs/instruction
Internal relays
256
256
256
Counters/Timers
256/256
256/256
256/256
Sequential control relays
256
256
256
For/Next loops
Yes
Yes
Yes
Integer math (+ - * /)
Yes
Yes
Yes
Real math (+ - * /)
Yes
Yes
Yes
Built-in high-speed counter
4 (20 KHz)
4 (20 KHz)
6 (20 KHz)
Analog adjustments
1
1
2
Pulse outputs
2 (20 KHz, DC only)
2 (20 KHz, DC only)
2 (20 KHz, DC only)
Communication interrupts
1 transmit/2 receive
1 transmit/2 receive
1 transmit/2 receive
Timed interrupts
2 (1 ms to 255 ms)
2 (1 ms to 255 ms)
2 (1 ms to 255 ms)
Hardware input interrupts
4
4
4
Real-time clock
Yes (cartridge)
Yes (cartridge)
Yes (built-in)
Password protection
Yes
Yes
Yes
Number of communication ports:
1 (RS-485)
1 (RS-485)
1 (RS-485)
Protocols supported Port 0:
PPI, MPI slave,
Freeport
PPI, MPI slave,
Freeport
PPI, MPI slave,
Freeport
PROFIBUS peer-to-peer
(NETR/NETW)
(NETR/NETW)
(NETR/NETW)
Memory
Local I/O
Total I/O
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Instructions
Enhanced Features
Communications
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
1-3
Introducing the S7-200 Micro PLC
1.2
Major Components of the S7-200 Micro PLC
An S7-200 Micro PLC consists of an S7-200 CPU alone or with a variety of
optional expansion modules.
S7-200 CPU
The S7-200 CPU combines a central processing unit (CPU), power supply, and
discrete I/O points into a compact, stand-alone device.
The CPU executes the program and stores the data for controlling the
automation task or process.
Additional I/O points can be added to the CPU with expansion modules up to
the physical size limits listed in Table 1-1.
The power supply provides electrical power for the base unit and for any
expansion module that is connected.
The inputs and outputs are the system control points: the inputs monitor the
signals from the field devices (such as sensors and switches), and the outputs
control pumps, motors, or other devices in your process.
The communications port allows you to connect the CPU to a programming
device or to other devices.
Status lights provide visual information about the CPU mode (RUN or STOP),
the current state of the local I/O, and whether a system fault has been
detected.
Some CPUs provide a real-time clock as a built-in feature, while other CPUs
require the real-time clock cartridge.
A plug-in serial EEPROM cartridge provides a means to store CPU programs
and transfer programs from one CPU to another.
A plug-in battery cartridge provides extended retention of data memory in RAM.
1-4
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Introducing the S7-200 Micro PLC
Figure 1-3 shows the S7-200 CPU.
Status LEDs
Top terminal door
Power terminal
Output terminal
Cartridge
Front access door
RUN STOP switch
Potentiometer
Expansion I/O connection
Communication
Port
Bottom terminal door
Input terminal
Sensor power
Figure 1-3
S7-200 CPU
Expansion Modules
The S7-200 CPU provides a certain number of local I/O. Adding an expansion
module provides additional input or output points (see Figure 1-4).
Figure 1-4
CPU with an Expansion Module
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
1-5
Introducing the S7-200 Micro PLC
1-6
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
2
Installing an S7-200 PLC
The installation of the S7-200 equipment is designed to be easy. You can use the
mounting holes to attach the modules to a panel, or you can use the built-in clips to
mount the modules onto a standard (DIN) rail. The small size of the S7-200 allows
you to make efficient use of space.
This chapter provides guidelines for installing and wiring your S7-200 system.
Chapter Overview
Section
Description
Page
2.1
Panel Layout Considerations
2-2
2.2
Installing and Removing an S7-200 Micro PLC or Expansion
Module
2-6
2.3
Installing the Field Wiring
2-9
2.4
Using Suppression Circuits
2-16
2.5
Power Considerations
2-18
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
2-1
Installing an S7-200 PLC
2.1
Panel Layout Considerations
Installation Configuration
You can install an S7-200 either on a panel or on a standard rail. You can mount
the S7-200 either horizontally or vertically. You can connect the S7-200 to
expansion modules by one of these methods:
A flexible ribbon cable with mating connector is built into the I/O module for
easy connection to the PLC or another expansion module.
An I/O expansion cable is also available to add flexibility to your mounting
configuration.
Figure 2-1 shows a typical configuration for these types of installations.
Panel mounting
S7-200
I/O
Standard rail mounting
I/O
S7-200
I/O
I/O
Figure 2-1
2-2
I/O
I/O
Mounting Configurations
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Installing an S7-200 PLC
Clearance Requirements for Installing an S7-200 PLC
Use the following guidelines as you plan your installation:
The S7-200 CPU and expansion modules are designed for natural convection
cooling. You must provide a clearance of at least 25 mm (1 in.), both above and
below the units, for proper cooling. See Figure 2-2. Continuous operation of all
electronic products at maximum ambient temperature and load reduces their
life.
For vertical mounting, the maximum ambient temperature is reduced by 10° C.
The CPU should be mounted below any expansion modules. If you are
mounting on a vertical DIN rail, you should use the DIN rail stop.
Allow 75 mm (3 in.) for mounting depth. See Figure 2-2.
Be sure to allow enough space in your mounting design to accommodate the
I/O wiring and communication cable connections.
25 mm
(1 in.)
ÂÂÂÂÂÂÂ
ÂÂÂÂÂÂÂ
ÂÂÂÂÂÂÂ
ÂÂÂÂÂÂÂ
ÂÂÂÂÂÂÂ
Clearance for cooling
25 mm
(1 in.)
S7-200
Front View
Figure 2-2
I/O
Front of the
enclosure
S7-200
Mounting
surface
75 mm
(3 in.)
Side View
Horizontal and Vertical Clearance Requirements for Installing an S7-200 PLC
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
2-3
Installing an S7-200 PLC
Standard Rail Requirements
The S7-200 CPU and expansion modules can be installed on a standard (DIN) rail
(DIN EN 50 022). Figure 2-3 shows the dimensions for this rail.
1.0 mm
(0.04 in.)
35 mm
(1.38 in.)
7.5 mm
(0.30 in.)
Figure 2-3
Standard Rail Dimensions
Panel-Mounting Dimensions
S7-200 CPUs and expansion modules include mounting holes to facilitate
installation on panels. Figure 2-4 through Figure 2-6 provide the mounting
dimensions for the different S7-200 CPUs and expansion modules.
90 mm
(3.54 in.)
4 mm
(0.16 in.)
82 mm
(3.23 in.)
4 mm
(0.16 in.)
88 mm
(3.46 in.)
96 mm
(3.78 in.)
80 mm
(3.15 in.)
CPU 221
CPU 222
4 mm
(0.16 in.)
Figure 2-4
2-4
ÁÁ
Mounting holes
(M4 or No. 8)
Mounting Dimensions for CPU 221 and CPU 222
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Installing an S7-200 PLC
4 mm
(0.16 in.)
120.5 mm
(4.74 in.)
4 mm
(0.16 in.)
112.5 mm
(4.43 in.)
88 mm
(3.46 in.)
96 mm
(3.78 in.)
CPU 224
80 mm
(3.15 in.)
ÁÁ
4 mm
(0.16 in.)
Figure 2-5
Mounting Dimensions for a CPU 224
Mounting holes
(M4 or No. 8)
Existing
CPU or
Expansion
Module
4 mm
(0.16 in.)
ÁÁ
ÁÁ
Á
Á
8-Point
Expansion
Module
ÁÁ
ÁÁ
Á
Á
4 mm
(0.16 in.)
96 mm
(3.78 in.)
16-Point
Expansion
Module
88 mm
(3.46 in.)
80 mm
(3.15 in.)
ÁÁ
ÁÁ
38 mm
(1.50 in.)
9.5 mm*
(0.37 in.)
63.2 mm
(2.49 in.)
46 mm
(1.81 in.)
71.2 mm
(2.80 in.)
9.5 mm*
(0.37 in.)
Figure 2-6
Mounting holes
(M4 or No. 8)
4 mm
(0.16 in.)
4 mm
(0.16 in.)
* Minimum spacing
between modules
when hardmounted
with M4 or No. 8
screws to a panel.
Mounting Dimensions for Expansion Modules
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
2-5
Installing an S7-200 PLC
2.2
Installing and Removing an S7-200 Micro PLC or Expansion
Module
Mounting an S7-200 Micro PLC or Expansion Module onto a Panel
!
Warning
Attempts to install or remove S7-200 CPUs or related equipment with power
applied could cause electric shock or faulty operation of equipment.
Failure to disable all power to the S7-200 and related equipment during installation
or removal procedures may result in death or serious personal injury, and/or
damage to equipment.
Always follow appropriate safety precautions and ensure that power to the S7-200
is disabled before attempting to install or remove S7-200 CPUs or related
equipment.
Use the following procedure for installing an S7-200 CPU onto a panel:
1. Locate, drill, and tap the mounting holes for DIN M4 or American
Standard number 8 screws. Refer to Section 2.1 for mounting dimensions and
other considerations.
2. Secure the S7-200 CPUs onto the panel, using DIN M4 or American
Standard number 8 screws.
To install the expansion module onto a panel, follow these steps:
1. Locate, drill, and tap the mounting holes for DIN M4 or American
Standard number 8 screws. Refer to Section 2.1 for mounting dimensions and
other considerations.
2. Place the I/O module next to the PLC or expansion module and secure it.
3. Plug the expansion module ribbon cable into the CPU connector under the front
access door. The cable is keyed for correct orientation.
4. Installation is complete.
2-6
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Installing an S7-200 PLC
Installing an S7-200 Micro PLC or Expansion Module onto a Standard Rail
!
Warning
Attempts to install or remove S7-200 CPUs or related equipment when they are
powered up could cause electric shock or faulty operation of equipment.
Failure to disable all power to the S7-200 CPUs and related equipment during
installation or removal procedures may result in death or serious personal injury,
and/or damage to equipment.
Always follow appropriate safety precautions and ensure that power to the S7-200
is disabled before attempting to install or remove S7-200 CPUs or related
equipment.
To install the S7-200 CPU onto a standard rail, follow these steps:
1. Secure the rail to the mounting panel every 75 mm (3.0 in.).
2. Snap open the clip (located on the bottom of the S7-200) and hook the back of
the S7-200 onto the rail.
3. Snap the clip closed, carefully checking to ensure that the clip has fastened the
S7-200 securely onto the rail.
To install the expansion module onto a standard rail, use the following steps:
1. Snap open the clip and hook the back of the expansion module onto the rail
next to the CPU or expansion module.
2. Snap the clip closed to secure the expansion module to the rail. Carefully check
to ensure that the clip has fastened the module securely onto the rail.
3. Plug the expansion module ribbon cable into the CPU connector under the front
access door. The cable is keyed for correct orientation.
4. Installation is complete.
Note
Modules in an environment with high vibration potential or modules that have been
installed in a vertical position may require DIN rail stops.
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
2-7
Installing an S7-200 PLC
Removing the S7-200 Micro PLC or Expansion Module
!
Warning
Attempts to install or remove S7-200 CPUs or related equipment when they are
powered up could cause electric shock or faulty operation of equipment.
Failure to disable all power to the S7-200 CPUs and related equipment during
installation or removal procedures may result in death or serious personal injury,
and/or damage to equipment.
Always follow appropriate safety precautions and ensure that power to the S7-200
modules is disabled before installation.
To remove the S7-200 CPU or expansion module, follow these steps:
1. Disconnect all the wiring and cabling that is attached to the module that you are
removing. See Figure 2-7. Some CPUs and expansion modules have
removeable connectors.
2. Open the front access door and disconnect the ribbon cable from the adjacent
modules.
3. Unscrew the mounting screws or snap open the clip, and remove the module.
!
Warning
If you install an incorrect module, the program in the micro PLC could function
unpredictably.
Failure to replace an expansion module and expansion cable with the same model
or in the proper orientation may result in death or serious personal injury, and/or
damage to equipment.
Replace an expansion module with the same model, and orient it correctly.
To remove this unit:
Disconnect cable connection here
Figure 2-7
2-8
Removing the Expansion Module
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Installing an S7-200 PLC
2.3
!
Installing the Field Wiring
Warning
Attempts to install or remove S7-200 CPUs or related equipment when they are
powered up could cause electric shock or faulty operation of equipment.
Failure to disable all power to the S7-200 CPUs and related equipment during
installation or removal procedures may result in death or serious personal injury,
and/or damage to equipment.
Always follow appropriate safety precautions and ensure that power to the S7-200
is disabled before installing field wiring.
General Guidelines
The following items are general guidelines for designing the installation and wiring
of your S7-200 Micro PLC:
Ensure that you follow all applicable electrical codes when wiring the S7-200
Micro PLC. Install and operate all equipment according to all applicable national
and local standards. Contact your local authorities to determine which codes
and standards apply to your specific case.
Always use the proper wire size to carry the required current. The S7-200
accepts wire sizes from 1.50 mm2 to 0.50 mm2 (14 AWG to 22 AWG).
Ensure that you do not over-tighten the connector screws. The maximum
torque is 0.56 N-m (5 inch-pounds).
Always use the shortest wire possible (maximum 500 m shielded, 300 m
unshielded). Wiring should be run in pairs, with a neutral or common wire paired
with a hot or signal-carrying wire.
Separate AC wiring and high-energy, rapidly switched DC wiring from
low-energy signal wiring.
Properly identify and route the wiring to the S7-200, using strain relief for the
wiring as required. For more information about identifying the terminals, see the
specifications in Appendix A.
Install appropriate surge suppression devices for any wiring that is subject to
lightning surges.
External power should not be applied to an output load in parallel with a DC
output point. This may cause reverse current through the output, unless a diode
or other barrier is provided in the installation.
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
2-9
Installing an S7-200 PLC
!
Warning
Control devices can fail in an unsafe condition, resulting in unexpected operation
of controlled equipment.
Such unexpected action could result in death or serious personal injury, and/or
equipment damage.
Consider using an emergency stop function, electromechanical overrides, or other
redundant safeguards that are independent of the programmable controller.
Grounding and Circuit Reference Point Guidelines for Using Isolated Circuits
The following items are grounding and circuit guidelines for using isolated circuits:
You should identify the reference point (0 voltage reference) for each circuit in
the installation, and the points at which circuits with possibly different
references can connect together. Such connections can result in unwanted
current flows that can cause logic errors or can damage circuits. A common
cause of different reference potentials is grounds that are physically separated
by long distances. When devices with widely separated grounds are connected
with a communication or sensor cable, unexpected currents can flow through
the circuit created by the cable and the ground. Even over short distances, load
currents of heavy machinery can cause differences in ground potential or can
directly induce unwanted currents by electromagnetic induction. Power supplies
that are improperly referenced with respect to each other can cause damaging
currents to flow between their associated circuits.
When you connect CPUs with different ground potentials to the same PPI
network, you should use an isolated RS-485 repeater.
S7-200 products include isolation boundaries at certain points to help prevent
unwanted current flows in your installation. When you plan your installation, you
should consider where these isolation boundaries are provided, and where they
are not provided. You should also consider the isolation boundaries in
associated power supplies and other equipment, and where all associated
power supplies have their reference points.
You should choose your ground reference points and use the isolation
boundaries provided to interrupt unneeded circuit loops that could allow
unwanted currents to flow. Remember to consider temporary connections which
may introduce a new circuit reference, such as the connection of a
programming device to the CPU.
When locating grounds, you must also consider safety grounding requirements
and the proper operation of protective interrupting devices.
In most installations, you will have the best noise immunity if you connect the
sensor supply M terminal to ground.
2-10
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Installing an S7-200 PLC
The following descriptions are an introduction to general isolation characteristics of
the S7-200 family, but some features may be different on specific products.
Consult your product specifications in Appendix A for information about which
circuits include isolation boundaries and the ratings of the boundaries. Isolation
boundaries rated less than 1,500 VAC are designed as functional isolation only,
and should not be depended on as safety boundaries.
Logic circuit reference is the same as DC sensor supply M.
Logic circuit reference is the same as the input power supply M on a CPU with
DC power supply.
CPU communication ports have the same reference as logic circuit.
Analog inputs and outputs are not isolated from logic circuit. Analog inputs are
full differential to provide low voltage common mode rejection.
Logic circuit is isolated from ground to 500 VAC.
DC digital inputs and outputs are isolated from logic circuit to 500 VAC.
DC digital I/O groups are isolated from each other by 500 VAC.
Relay outputs are isolated from logic circuit to 1,500 VAC.
Relay output groups are isolated from each other by 1,500 VAC.
AC power supply line and neutral are isolated from ground, the logic circuit, and
all I/O to 1,500 VAC.
Using the Optional Field Wiring Connector with Units without a Removable
Connector
The optional field wiring fan-out connector (Figure 2-8) allows for field wiring
connections to remain fixed when you remove and re-install the S7-200 unit. Refer
to Appendix E for the order number of the fan-out connector.
Field Wiring
Fan-Out Connector
Figure 2-8
Optional Field Wiring Connector
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Installing an S7-200 PLC
Using the Removable Terminal Block Connector
The removable terminal block connector (Figure 2-9) allows field wiring
connections to remain fixed when you remove and re-install the S7-200 CPU and
I/O expansion modules.
To remove the terminal block connector from the CPU or expansion module, follow
these steps:
1. Raise the top terminal door of the CPU or expansion module.
2. Insert a screwdriver in the notch in the middle of the terminal block as shown in
Figure 2-9.
3. Press down firmly and pry out the terminal connector as shown below.
To reinstall a terminal block connector in a CPU or expansion module, follow these
steps:
1. Raise the top terminal door of the CPU or expansion module.
2. Ensure that the new terminal block connector is properly aligned with the pins
on the CPU or expansion module.
3. Press down the terminal block connector into the CPU or expansion module
until the connector snaps into place.
Figure 2-9
2-12
Removable Terminal Block Connector for the CPU 224 and I/O Expansion
Modules.
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Installing an S7-200 PLC
Guidelines for AC Installation
The following items are general wiring guidelines for AC installations. Refer to
Figure 2-10.
[a] Provide a single disconnect switch that removes power from the CPU, all
input circuits, and all output (load) circuits.
[b] Provide overcurrent devices to protect the CPU power supply, the output
points, and the input points. You can also fuse each output point individually for
greater protection.
[c] External overcurrent protection for input points is not required when you use
the 24 VDC sensor supply from the Micro PLC. This sensor supply is
short-circuit protected.
[d] Connect all S7-200 ground terminals to the closest available earth ground to
provide the highest level of noise immunity. It is recommended that all ground
terminals be connected to a single electrical point. Use 14 AWG or 1.5 mm2
wire for this connection.
[e] DC sensor supply from the base unit may be used for base unit inputs,
[f] expansion DC inputs, and [g] expansion relay coils. This sensor supply is
short-circuit protected.
[h] In most installations, you will have the best noise immunity if you connect
the sensor supply M terminal to ground.
L1
N
PE
[a] [b]
[d]
[f]
DO
DI
[g]
PST
M L+
S7-200
AC/DC/Rly
DI
EM 221 DC
DO
EM 222 Rly
[h]
[e]
Figure 2-10
[c]
120 VAC/230 VAC Using a Single Overcurrent Switch to Protect the CPU and
Load Wiring
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2-13
Installing an S7-200 PLC
Guidelines for DC Installation
The following items are general wiring guidelines for DC installations. Refer to
Figure 2-11.
[a] Provide a single disconnect switch that removes power from the CPU, all
input circuits, and all output (load) circuits.
[b] Provide overcurrent devices to protect the CPU power supply, [c] the output
points, and [d] the input points. You can also fuse each output point individually
for greater protection. External overcurrent protection for input points is not
required when you use the 24 VDC sensor supply from the Micro PLC. This
sensor supply is current limited internally.
[e] Ensure that the DC power supply has sufficient surge capacity to maintain
voltage during sudden load changes. External capacitance may be required.
[f] In most installations, you will have best noise immunity by connecting all DC
power supplies to ground. Equip ungrounded DC power supplies with a resistor
and a capacitor in parallel [g] from the power source common to protective
earth ground. The resistor provides a leakage path to prevent static charge
accumulations, and the capacitor provides a drain for high frequency noise.
Typical values are 1 MΩ and 4,700 pf.
[h] Connect all S7-200 ground terminals to the closest available earth ground to
provide the highest level of noise immunity. It is recommended that all ground
terminals be connected to a single electrical point. Use 14 AWG or 1.5 mm2
wire for this connection.
Always supply 24 VDC circuits from a source that provides safe electrical
separation from 120/230 VAC power and similar hazards.
The following documents provide standard definitions of safe separation:
PELV (protected extra low voltage) according to EN 60204-1
Class 2 or Limited Voltage/Current Circuit according to UL 508
2-14
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Installing an S7-200 PLC
Floating [f] or Grounded [g]
[a]
L1
N
PE
AC
[h]
[g]
DC
[f]
[e]
[b]
[c]
DO
DI
PS
S7-200
DC/DC/DC
M
DO
EM 222
DC
DI
EM 221
DC
[d]
24 VDC
Figure 2-11
L+
M
DC System Installation
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2-15
Installing an S7-200 PLC
2.4
Using Suppression Circuits
General Guidelines
Equip inductive loads with suppression circuits that limit voltage rise on loss of
power. Use the following guidelines to design adequate suppression. The
effectiveness of a given design depends on the application, and you must verify it
for a particular use. Be sure all components are rated for use in the application.
Protecting DC Transistors
The S7-200 DC transistor outputs contain zener diodes that are adequate for many
installations. Use external suppression diodes for either large or frequently
switched inductive loads to prevent overpowering the internal diodes. Figure 2-12
and Figure 2-13 show typical applications for DC transistor outputs.
[a]
+VDC
[a] IN4001 diode or
equivalent
Inductor
Figure 2-12
Diode Suppression for DC Transistor Outputs
+VDC
[a]
[b]
[a] IN4001 diode or
equivalent
[b] 8.2 V zener, 5W
Inductor
Figure 2-13
2-16
Zener Diode Suppression for DC Transistor Outputs
S7-200 Programmable Controller System Manual
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Installing an S7-200 PLC
Protecting Relays That Control DC Power
Resistor/capacitor networks, as shown in Figure 2-14, can be used for low voltage
(30 V) DC relay applications. Connect the network across the load.
R+
R
C
where minimum R = 12 Ω
+VDC
Inductor
Figure 2-14
V DC
IL
IL
C + I LK
where K is 0.5 µF/A to 1 µF/A
Resistor/Capacitor Network on Relay-Driven DC Load
You can also use diode suppression, as shown in Figure 2-12 and Figure 2-13, for
DC relay applications. A threshold voltage of up to 36 V is allowed if you use a
reverse zener diode.
Protecting Relays That Control AC Power
When you use a relay to switch 115 VAC/230 VAC inductive loads, you should
place resistor/capacitor networks across the relay contacts as shown in
Figure 2-15. You can also use a metal oxide varistor (MOV) to limit peak voltage.
Ensure that the working voltage of the MOV is at least 20% greater than the
nominal line voltage.
R
R > 0.5 x Vrms for relay
MOV
C
C = 0.002 µF to 0.005 µF for each
10 VA of steady-state load
Inductor
Figure 2-15
AC Load with Network across Relay
The capacitor allows leakage current to flow around the open switch. Be sure that
the leakage current, I (leakage) = 2 x 3.14 x f x C x Vrms, is acceptable for the
application.
For example: A NEMA size 2 contactor lists 183 VA coil inrush and 17 VA sealed
coil load. At 115 VAC, the inrush current is 183 VA/115 V = 1.59 A, which is within
the 2-A switching capability of the relay contacts.
The resistor = 0.5 x 115 = 57.5 W; choose 68 W as a standard value.
The capacitor = (17 VA/10) x 0.005 = 0.0085 µF; choose 0.01 µF as the value.
The leakage current = 2 x 3.14 x 60 x 0.01 x 10-6 x 115 = 0.43 mA rms.
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2-17
Installing an S7-200 PLC
2.5
Power Considerations
The S7-200 base units have an internal power supply that provides power for the
base unit, the expansion modules, and other 24 VDC user power requirements.
Use the following information as a guide for determining how much power (or
current) the base unit can provide for your configuration.
Power Requirements
Each S7-200 CPU supplies both 5 VDC and 24 VDC power:
Each CPU has a 24 VDC sensor supply that can supply 24 VDC for local input
points or for relay coils on the expansion modules. If the power requirement for
24 VDC exceeds the power budget of the CPU, you can add an external
24 VDC power supply to provide 24 VDC to the expansion modules. You must
manually connect the 24 VDC supply to the input points or relay coils.
The CPU also provides 5 VDC power for the expansion modules when an
expansion module is connected. If the 5 VDC power requirements for
expansion modules exceeds the power budget of the CPU, you must remove
expansion modules until the requirement is within the power budget.
The specifications in Appendix A provide information about the power budgets of
the CPUs and the power requirements of the expansion modules.
!
Warning
Connecting an external 24 VDC power supply in parallel with the S7-200 DC
Sensor Supply can result in a conflict between the two supplies as each seeks to
establish its own preferred output voltage level.
The result of this conflict can be shortened lifetime or immediate failure of one or
both power supplies, with consequent unpredictable operation of the PLC system.
Unpredictable operation could result in death or serious injury to personnel, and/or
damage to equipment and property.
The S7-200 DC Sensor Supply and any external power supply should provide
power to different points. A single connection of the commons is allowed.
2-18
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Installing an S7-200 PLC
Calculating a Sample Power Requirement
Table 2-1 shows a sample calculation of the power requirements for an S7-200
Micro PLC that includes the following:
CPU 224 AC/DC/Relay
3 each EM 223 8 DC In/8 Relay Out
1 each EM 221 8 DC In
This installation has a total of 46 inputs and 34 outputs.
The CPU in this example provides sufficient 5 VDC current for the expansion
modules, but does not provide enough 24 VDC current from the sensor supply for
all of the inputs and expansion relay coils. The I/O requires 400 mA and the CPU
provides only 280 mA. This installation requires an additional source of at least
120 mA at 24 VDC power to operate all the included 24 VDC inputs and outputs.
Table 2-1
Power Budget Calculations for a Sample Configuration
CPU Power Budget
CPU 224 AC/DC/Relay
5 VDC
24 VDC
660 mA
280 mA
5 VDC
24 VDC
minus
System Requirements
CPU 224, 14 inputs
14 * 4 mA =
56 mA
3 EM 223, 8 inputs each
3 * 8 * 4 mA =
96 mA
3 EM 223, 8 relay coils each
3 * 8 * 9 mA =
216 mA
1 EM 221, 8 inputs each
8 * 4 mA =
3 EM 223, 5 V power required
3 * 80 mA =
240 mA
1 EM 221, 5V power required
1 * 30 mA =
30 mA
Total Requirements
32 mA
270 mA
400 mA
equals
Current Balance
Current Balance Total
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5 VDC
24 VDC
390 mA
[120 mA]
2-19
Installing an S7-200 PLC
Calculating Your Power Requirement
Use the table below to determine how much power (or current) the CPU can
provide for your configuration. Refer to Appendix A for the power budgets of your
CPU and the power requirements of your expansion modules.
Power Budget
5 VDC
24 VDC
minus
System Requirements
5 VDC
24 VDC
Base Unit
Total Requirements
equals
Current Balance
5 VDC
24 VDC
Current Balance Total
2-20
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Getting Started with an S7-200
Programming System
3
This chapter describes how to set up an S7-200 programming system. The S7-200
programming system described in this chapter consists of:
S
An S7-200 CPU
S
A PC or programming device with STEP 7-Micro/WIN 32 installed
S
An interconnecting cable
Chapter Overview
Section
Description
Page
3.1
Overview
3-2
3.2
Quick Start for STEP 7-Micro/WIN 32
3-3
3.3
How Do I Set Up Communications Using the PC/PPI Cable?
3-5
3.4
How Do I Go Online With the S7-200 CPU?
3-9
3.5
How Do I Change the Communications Parameters for My
PLC?
3-10
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3-1
Getting Started with an S7-200 Programming System
3.1
Overview
General Information
You will need to base your installation on the following criteria:
S
The operating system that you are using (Windows 95, Windows 98, or
Windows NT 4.0)
S
The type of hardware you are using, for example:
– PC with PC/PPI cable
– PC or SIMATIC programming device with communications processor (CP)
card
– CPU 221, CPU 222, CPU 224
– Modem
S
The baud rate you are using
Recommended Equipment
STEP 7-Micro/WIN 32, version 3.0 is a Windows-based software application that
supports the 32-bit Windows 95, Windows 98, and Windows NT environments. In
order to use STEP 7-Micro/WIN 32, the following equipment is recommended:
S
A personal computer (PC) with an 80586 or greater processor and 16 Mbytes of
RAM, or a Siemens programming device with STEP 7-Micro/WIN 32 installed
(such as a PG 740); minimum computer requirement: 80486 processor with 8
Mbytes
S
One of the following sets of equipment:
– A PC/PPI cable connected to your communications port
– A communications processor (CP) card
S
VGA monitor, or any monitor supported by Microsoft Windows
S
At least 50 Mbytes of free hard disk space
S
Windows 95, Windows 98, or Windows NT 4.0
S
Optional but recommended: any mouse supported by Microsoft Windows
STEP 7-Micro/WIN 32 provides extensive online help and an online Getting
Started Manual. Use the Help menu command or press F1 to obtain the most
current information.
3-2
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Getting Started with an S7-200 Programming System
3.2
Quick Start for STEP 7-Micro/WIN 32
Pre-Installation Instructions
Before running the setup procedure, do the following:
S
If a previous version of STEP 7-Micro/WIN 32 is installed, back up all
STEP 7-Micro/WIN projects to diskette.
S
Make sure all applications are closed, including the Microsoft Office toolbar.
S
Be sure the cable between your personal computer and the CPU is connected.
See Section 3.3 for instructions.
Installing STEP 7-Micro/WIN 32
Use the following procedure to install the STEP 7-Micro/WIN 32 software:
1. Start by inserting the CD or disk in the CD or disk drive of your computer.
2. Click once on the “Start” button to open the Windows menu.
3. Click on the Run... menu item.
4. If you are installing from a:
disk: In the Run dialog box, type a:\setup and click on OK or press ENTER. This
starts the setup procedure.
CD: In the Run dialog box, type e:\setup and click on OK or press ENTER. This
starts the setup procedure.
5. Follow the online setup procedure to complete the installation.
6. At the end of the installation, the Setting the PG/PC Interface dialog box
appears automatically. Click “Cancel” to bring up the main
STEP 7-Micro/WIN 32 window. See Figure 3-1.
Review the READMEX.TXT file included on your CD or diskettes for the most
recent information about STEP 7-Micro/WIN 32. (In the x position, the letter
A = German, B = English, C = French, D = Spanish, E = Italian.)
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3-3
Getting Started with an S7-200 Programming System
"
Project Edit View PLC Debug Tools Windows Help
View
Program Block
Symbol Table
Status Chart
Data Block
System Block
Cross Reference
Communications
Figure 3-1
View Menu of STEP 7-Micro/WIN 32
Common Problem List for Single Connection User
The following situations can cause the communication to fail:
3-4
S
Wrong baud rate: Correct the baud rate
S
Wrong station address: Correct the station address
S
PC/PPI cable set incorrectly: Check DIP switch settings on PC/PPI cable
S
Wrong communication port on personal computer: Check comm port
S
CPU in freeport mode (comm port under control of user program): Put CPU in
STOP mode
S
Conflict with other masters: Disconnect the CPU from the network.
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Getting Started with an S7-200 Programming System
3.3
How Do I Set Up Communications Using the PC/PPI Cable?
This section explains how to set up communications between an S7-200 CPU and
your personal computer using the PC/PPI cable. This is single master configuration
with no other hardware (such as a modem or a programming device) installed.
How Do I Connect My Computer to the CPU?
Figure 3-2 shows a typical configuration for connecting your personal computer to
your CPU with the PC/PPI cable. To establish proper communications between the
components, follow these steps:
1. Set the DIP switches on the PC/PPI cable for the baud rate supported by your
personal computer. You should also select 11-bit and DCE if these options are
supported by your PC/PPI cable.
2. Connect the RS-232 end of the PC/PPI cable (labeled PC) to the
communications port of your computer, either COM1 or COM2, and tighten the
connecting screws.
3. Connect the RS-485 end of the PC/PPI cable (labeled PPI) to the
communications port of the CPU, and tighten the connecting screws.
For the technical specifications of the PC/PPI cable, see Appendix A; for its order
number, see Appendix E.
Computer
DIP switch settings (down = 0, up = 1):
S7-200 CPU
1
RS-232
0
RS-485
PC/PPI cable
Isolated
PC/PPI Cable
PPI
1
0
Figure 3-2
1 2 3 4 5
Baud
Rate
38.4K
19.2K
9.6K
2.4K
1.2K
PC
123 SWITCH 4
000
001
010 SWITCH 5
100
101
1 = 10 BIT
0 = 11 BIT
1 = DTE
0 = DCE
Communicating with a CPU in PPI Mode
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3-5
Getting Started with an S7-200 Programming System
How Do I Verify the Default Parameters for My Interface?
You can verify the default parameters for your interface by following the steps
below:
1. In the STEP 7-Micro/WIN 32 window, click the Communications icon, or select
View > Communications from the menu. The Communications Setup dialog
box appears.
2. In the Communications Setup dialog box, double-click on the icon for the
PC/PPI cable. The Setting the PG/PC Interface dialog box appears. See
Figure 3-3.
3. Select the “Properties” button. The Properties dialog box for the interface
appears (see Figure 3-4). Check the properties to ensure that they are correct.
The transmission rate should be 9,600 baud.
4. For help in changing the default parameters, see Section 7.3 in Chapter 7.
Note
If the hardware that you are using does not appear on the list shown in Setting
the PG/PC Interface dialog box, then you must install the correct hardware. See
Installing and Removing Interfaces in Section 7.2.
3-6
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Getting Started with an S7-200 Programming System
Communications Links
Communications Setup
PC/PPI
cable
Address: 0
"
DoubleSetting
click the
icon representing the PLC
the PG/PC Interface
you
wish to communicate with.
Access Path
Double click
the Point
module
icon to change to
Access
of Application:
communication parameters.
Micro/WIN -->PC/PPI cable (PPI)
(Standard
for Micro/WIN)
Double click
the modem
icon to setup the
modem parameters or dial to start modem
Interface Parameter set used:
communications.
Properties...
PC/PPI cable (PPI)
Communication Parameters
MPI-ISA on board (MPI)
Remote Address:
2
MPI-ISA on board (PPI)
Local Address:
0
MPI-ISA Card (PROFIBUS)
Module: PC Adapter
PC/PPI
(MPI)cable (COM 1)
PC Adapter (PROFIBUS)PC/
Protocol: PPI cablePPI
(PPI)
Transmission Rate:
9.6 bps
(Assigning Parameters to a PC/PPI Cable
Mode
PC/PPI cable (COM 1)
for a PPI Network)
Copy...
Delete
Interfaces
Install...
OK
Figure 3-3
Cancel
Help
Setting the PG/PC Interface Dialog Box
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3-7
Getting Started with an S7-200 Programming System
"
Setting the PG/PC Interface
Access Path
Properties - PC/PPI cable (PPI)
Local Connection
PPI
Station Parameters
Address:
0
Timeout:
1s
Network Parameters
Multiple Master Network
Transmission Rate:
9.6 kbps
Highest Station Address:
31
OK
Default
Cancel
OK
Figure 3-4
3-8
Cancel
Help
Help
Properties - PG/PC Interface Dialog Box
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Getting Started with an S7-200 Programming System
3.4
How Do I Go Online With the S7-200 CPU?
Once you have installed STEP 7-Micro/WIN 32 software on your PC and set up
communications with the PC/PPI cable, you are ready to go online with the S7-200
CPU. (If you are using a programming device, the STEP 7-Micro/WIN 32 is already
installed.)
Follow the steps below to go online with the S7-200 CPU:
1. In the STEP 7-Micro/WIN 32 screen, click the Communications icon, or select
View > Communications from the menu. The Communications Setup dialog
box appears and shows that there are no CPUs connected.
2. Double click the refresh icon in the Communications Setup dialog box.
STEP 7-Micro/WIN 32 checks for any S7-200 CPUs (stations) that are
connected. A CPU icon appears on the Communications Setup dialog box for
each connected station. See Figure 3-5.
3. Double click the station that you want to communicate with. You will notice that
the communication parameters on the Setup Communications dialog box
reflects the parameters for the selected station.
4. You are now online with the S7-200 CPU.
Communications Links
Communications Setup
Double click the icon representing the PLC
you wish to communicate with.
PC/PPI
Address: 0
CPU224
Double click the interface icon to change to
communication parameters.
Double click the modem icon to setup the
modem parameters or dial to start modem
communications.
Double-Click
to Refresh
Communication Parameters
Remote Address
Local Address
0
Module
PC/PPI cable (COM 1)
Protocol
PPI
Transmission Rate 9.6 kbps
Mode
Figure 3-5
11-bit
Communications Setup Dialog Box
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3-9
Getting Started with an S7-200 Programming System
3.5
How Do I Change the Communications Parameters for My PLC?
Once you are online with the S7-200 CPU, you can verify or change the
communications parameters for your PLC.
To change the communications parameters follow the steps below:
1. Click the System Block icon on the navigation bar, or select View > System
Block from the menu.
2. The System Block dialog box appears. Click on the Port(s) tab (see Figure 3-6).
By default, the station address is 2, and the baud rate is 9.6 kbaud.
3. Select “OK” to keep these parameters. If you wish to change the parameters,
make your changes, then click the “Apply” button, then click “OK”.
4. Click the Download icon on the toolbar to load the changes into the PLC.
5. Your communications parameters have been accepted.
System Block
Port(s)
Background Time
Pulse Catch Bits
Analog Input Filters
Retentive Ranges
Password
Port 0
Output Table
Defaults
Port 1
PLC Address: 2
Highest Address: 31
Input Filters
2
(range 1...126)
31
(range 1...126)
9.6 kbps
Baud Rate: 9.6 kbps
Retry Count: 3
Gap Update Factor: 10
3
(range 0...8)
10
(range 1...100)
Configuration parameters must be downloaded before they take effect.
Not all PLC types support every System Block option. Press F1 to see
which options are supported by each PLC.
OK
Figure 3-6
3-10
Cancel
Apply
Changing the Communications Parameters
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Basic Concepts for Programming an
S7-200 CPU
4
Before you start to program your application using the S7-200 CPU, you should
become familiar with some of the basic operational features of the CPU.
Chapter Overview
Section
Description
Page
4.1
Guidelines for Designing a Micro PLC System
4-2
4.2
Concepts of an S7-200 Program
4-5
4.3
Concepts of the S7-200 Programming Languages and Editors
4-6
4.4
Understanding the Differences between SIMATIC and
IEC 1131-3 Instructions
4-10
4.5
Basic Elements for Constructing a Program
4-18
4.6
Understanding the Scan Cycle of the CPU
4-22
4.7
Selecting the Mode of Operation for the CPU
4-25
4.8
Creating a Password for the CPU
4-27
4.9
Debugging and Monitoring Your Program
4-30
4.10
Error Handling for the S7-200 CPU
4-36
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4-1
Basic Concepts for Programming an S7-200 CPU
4.1
Guidelines for Designing a Micro PLC System
There are many methods for designing a Micro PLC system. This section provides
some general guidelines that can apply to many design projects. Of course, you
must follow the directives of your own company’s procedures and of the accepted
practices of your own training and location. Figure 4-1 shows some of the basic
steps in the design process.
Partition your process or machine.
Create the functional specifications of the units.
Design the hard-wired safety circuits.
Specify the operator stations.
Create the PLC configuration drawings.
Create a list of symbolic signal-naming conventions (optional).
Figure 4-1
Basic Steps for Planning a PLC System
Partitioning Your Process or Machine
Divide your process or machine into sections that have a level of independence
from each other. These partitions determine the boundaries between controllers
and influence the functional description specifications and the assignment of
resources.
4-2
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Basic Concepts for Programming an S7-200 CPU
Creating the Functional Specifications
Write the descriptions of operation for each section of the process or machine.
Include the following topics:
Input/output (I/O) points
Functional description of the operation
Permissive states (states that must be achieved before allowing action) for
each actuator (solenoids, motors, drives, etc.)
Description of the operator interface
Interfaces with other sections of the process or machine
Designing the Safety Circuits
Identify equipment requiring hard-wired logic for safety. Control devices can fail in
an unsafe manner, producing unexpected startup or change in the operation of
machinery. Where unexpected or incorrect operation of the machinery could result
in physical injury to people or significant property damage, consideration should be
given to the use of electro-mechanical overrides which operate independently of
the CPU to prevent unsafe operations.
The following tasks should be included in the design of safety circuits:
Identify improper or unexpected operation of actuators that could be hazardous.
Identify the conditions that would assure the operation is not hazardous, and
determine how to detect these conditions independently of the CPU.
Identify how the CPU and I/O affect the process when power is applied and
removed, and when errors are detected. This information should only be used
for designing for the normal and expected abnormal operation, and should not
be relied on for safety purposes.
Design manual or electro-mechanical safety overrides that block the hazardous
operation independent of the CPU.
Provide appropriate status information from the independent circuits to the CPU
so that the program and any operator interfaces have necessary information.
Identify any other safety-related requirements for safe operation of the process.
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Basic Concepts for Programming an S7-200 CPU
Specifying the Operator Stations
Based on the requirements of the functional specifications, create drawings of the
operator stations. Include the following items:
Overview showing the location of each operator station in relation to the
process or machine
Mechanical layout of the devices (display, switches, lights, etc.) for the operator
station
Electrical drawings with the associated I/O of the CPU or expansion module
Creating the PLC Configuration Drawings
Based on the requirements of the functional specification, create configuration
drawings of the control equipment. Include the following items:
Overview showing the location of each CPU in relation to the process or
machine
Mechanical layout of the CPU and expansion I/O modules (including cabinets
and other equipment)
Electrical drawings for each CPU and expansion I/O module (including the
device model numbers, communication addresses, and I/O addresses)
Creating a List of Symbolic Names
If you choose to use symbolic names for addressing, create a list of symbolic
names for the absolute addresses. Include not only the physical I/O signals, but
also the other elements to be used in your program.
4-4
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4.2
Concepts of an S7-200 Program
Relating the Program to Inputs and Outputs
The basic operation of the S7-200 CPU is very simple:
The CPU reads the status of the inputs.
The program that is stored in the CPU uses these inputs to evaluate the control
logic. As the program runs, the CPU updates the data.
The CPU writes the data to the outputs.
Figure 4-2 shows a simple diagram of how an electrical relay diagram relates to
the S7-200 CPU. In this example, the state of the operator panel switch for
opening the drain is added to the states of other inputs. The calculations of these
states then determine the state for the output that goes to the solenoid that closes
the drain.
The CPU continuously cycles through the program, reading and writing data.
Opn_Drn_PB
Cls_Drn_PB
A_Mtr_Fbk
E_Stop_On
Drain_Sol
Drain_Sol
S7-200 CPU
Output
Area
Input
Area
Output
Input
Areas of Memory
in the CPU
Figure 4-2
S
Drain Solenoid
Operator Station
Relating the Program to Inputs and Outputs
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Basic Concepts for Programming an S7-200 CPU
4.3
Concepts of the S7-200 Programming Languages and Editors
The S7-200 CPUs offer many types of instructions that allow you to solve a wide
variety of automation tasks. There are two basic instruction sets available in the
S7-200 CPU: SIMATIC and IEC 1131-3. Also, our PC-based programming
software, STEP 7-Micro/WIN 32, provides different editor choices that allow you to
create control programs with these instructions. For example, you may prefer to
create programs in a more graphical environment, while someone else in your
company may prefer a text-based assembly-language style of editor.
You have two primary choices to consider whenever you create your programs.
Type of instruction set to use (SIMATIC or IEC 1131-3 )
Type of editor to use (Statement List, Ladder Logic, or Function Block Diagram)
The S7-200 instruction set and editor combinations shown in Table 4-1 are
possible.
Table 4-1
SIMATIC and IEC 1131-3 Instruction Set and Editors
SIMATIC Instruction Set
IEC 1131-3 Instruction Set
Statement List (STL) Editor
not available
Ladder Logic (LAD) Editor
Ladder Logic (LAD) Editor
Function Block Diagram (FBD) Editor
Function Block Diagram (FBD) Editor
Statement List Editor
The STEP 7-Micro/WIN 32 Statement List (STL) editor allows you to create control
programs by entering the instruction mnemonics. In general, the STL editor is
more suitable for experienced programmers who are familiar with PLCs and logic
programming. The STL editor also allows you to create programs that you could
not otherwise create with the Ladder Logic or Function Block Diagram editors. This
is because you are programming in the native language of the CPU, rather than in
a graphical editor where some restrictions must be applied in order to draw the
diagrams correctly. Figure 4-3 shows an example of a statement list program.
STL
NETWORK
LD
I0.0
LD
I0.1
LD
I2.0
A
I2.1
OLD
ALD
=
Q5.0
Figure 4-3
4-6
Example of an STL Program
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Basic Concepts for Programming an S7-200 CPU
As you can see from Figure 4-3, this text-based concept is very similar to
assembly language programming. The CPU executes each instruction in the order
dictated by the program, from top to bottom, and then restarts at the top. STL and
assembly language are also similar in another sense. S7-200 CPUs use a logic
stack to resolve the control logic (see Figure 4-4). The LAD and FBD editors
automatically insert the instructions that are necessary to handle the stack
operation. In STL, you have to insert these instructions to handle the stack.
Bits of the Logic Stack
Load (LD)
Loads a new value (nv) onto the
stack.
Before Load
iv0
iv1
iv2
iv3
iv4
iv5
iv6
iv7
iv8
After Load
nv
iv0
iv1
iv2
iv3
iv4
iv5
iv6
iv7
iv8 is lost.
S0
S1
S2
S3
S4
S5
S6
S7
S8
Stack 0
Stack 1
Stack 2
Stack 3
Stack 4
Stack 5
Stack 6
Stack 7
Stack 8
-
First stack level, or top of the stack
Second stack level
Third stack level
Fourth stack level
Fifth stack level
Sixth stack level
Seventh stack level
Eighth stack level
Ninth stack level
And (A)
ANDs a new value (nv) with the
initial value (iv) at the top of the
stack.
Or (O)
ORs a new value (nv) with the initial
value (iv) at the top of the stack.
S0 = iv0 + nv
S0 = iv0 * nv
Before And
After And
Before Or
After Or
iv0
iv1
iv2
iv3
iv4
iv5
iv6
iv7
iv8
S0
iv1
iv2
iv3
iv4
iv5
iv6
iv7
iv8
iv0
iv1
iv2
iv3
iv4
iv5
iv6
iv7
iv8
S0
iv1
iv2
iv3
iv4
iv5
iv6
iv7
iv8
In these examples, “iv0” to “iv7” identify the initial values of the logic stack, “nv” identifies a new value provided by the instruction, and
“S0” identifies the calculated value that is stored in the logic stack.
Figure 4-4
Logic Stack of the S7-200 CPU
The main points to consider when you select the STL editor are:
STL is most appropriate for experienced programmers.
STL sometimes allows you to solve problems that you cannot solve very easily
with the LAD or FBD editor.
You can only use the STL editor with the SIMATIC instruction set.
While you can always use the STL editor to view or edit a program that was
created with the SIMATIC LAD or FBD editors, the reverse is not always true.
You cannot always use the SIMATIC LAD or FBD editors to display a program
that was written with the STL editor.
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Basic Concepts for Programming an S7-200 CPU
Ladder Logic Editor
The STEP 7-Micro/WIN 32 Ladder Logic (LAD) editor allows you to build programs
that resemble the equivalent of an electrical wiring diagram. Ladder programming
is probably the method of choice for many PLC programmers and maintenance
personnel. Basically, the ladder programs allow the CPU to emulate the flow of
electric current from a power source, through a series of logical input conditions
that in turn enable logical output conditions. The logic is usually separated into
small, easy-to-understand pieces that are often called “rungs” or “networks.” The
program is executed one network at a time, from left to right and then top to
bottom as dictated by the program. Once the CPU has reached the end of the
program, it starts over again at the top of the program.
Figure 4-5 shows an example of a ladder logic program.
Network 1
I0.0
Q5.0
I0.1
I2.0
I2.1
Network 2
MOV_B
I2.1
VB50
Figure 4-5
EN
ENO
IN
OUT
SWAP
EN
AC0
AC0
ENO
IN
Example of LAD Program
The various instructions are represented by graphic symbols and include three
basic forms. As shown in Figure 4-5, you can connect multiple box instructions in
series.
Contacts - represent logic “input” conditions analogous to switches, buttons,
internal conditions and so on.
Coils - usually represent logic “output” results analogous to lamps, motor
starters, interposing relays, internal output conditions and so on.
Boxes - represent additional instructions such as timers, counters, or math
instructions.
The main points to consider when you select the LAD editor are:
Ladder logic is easy for beginning programmers to use.
Graphical representation is often easy to understand, and is popular around the
world.
The LAD editor can be used with both the SIMATIC and IEC 1131-3 instruction
sets.
You can always use the STL editor to display a program created with the
SIMATIC LAD editor.
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Function Block Diagram Editor
The STEP 7-Micro/WIN 32 Function Block Diagram (FBD) editor allows you to
view the instructions as logic boxes that resemble common logic gate diagrams.
There are no contacts and coils as found in the LAD editor, but there are
equivalent instructions that appear as box instructions. The program logic is
derived from the connections between these box instructions. That is, the output
from one instruction (such as an AND box) can be used to enable another
instruction (such as a timer) to create the necessary control logic. This connection
concept allows you to solve a wide variety of logic problems.
Figure 4-6 shows an example of a program created with the Function Block
Diagram editor.
T33
I2.1
V50.0
Figure 4-6
AND
AC0
IN
PT
TON
Example of FBD Program
The main points to consider when you select the FBD editor are:
The graphical logic gate style of representation is good for following program
flow.
The FBD editor can be used with both the SIMATIC and IEC 1131-3 instruction
sets.
You can always use the STL editor to display a program created with the
SIMATIC FBD editor.
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Basic Concepts for Programming an S7-200 CPU
4.4
Understanding the Differences between SIMATIC and IEC 1131-3
Instructions
SIMATIC Instruction Set
Most PLCs offer similar basic instructions, but there are usually small differences in
their appearance, operation, etc. from vendor to vendor. The SIMATIC instruction
set is designed for the S7-200 PLCs. These instructions may look and operate
slightly differently when compared to similar instructions in another brand of PLC.
The main points to consider when you select the SIMATIC instruction set are:
SIMATIC instructions usually have the shortest execution times.
All three editors (LAD, STL, FBD) work with the SIMATIC instruction set.
IEC 1131-3 Instruction Set
The International Electrotechnical Commission is a worldwide organization that
develops global standards for all fields of electrotechnology. Over the last several
years, the commission has developed an emerging standard that specifically
relates to many aspects of PLC programming. This standard encourages different
PLC manufacturers to offer instructions that are the same in both appearance and
operation. There are a few key differences between the SIMATIC instruction set
and the IEC1131-3 instruction set.
The IEC 1131-3 instruction set is restricted to those instructions that are
standard among PLC vendors. Some instructions that are normally included in
the SIMATIC set are not standard instructions in the IEC 1131-3 specification.
(These are still available for use as non-standard instructions, but if you use
them, the program is no longer strictly IEC 1131-3 compatible).
Some box instructions accept multiple data formats. This concept is often
referred to as overloading. For example, rather than have separate ADD_I (Add
Integer) and ADD_R (Add Real), math boxes, the IEC 1131-3 ADD instruction
examines the format of the data being added, and automatically chooses the
correct instruction in the CPU. This can save valuable program design time.
When you use the IEC 1131-3 instructions, the instruction parameters are
automatically checked for the proper data format. The data format checking is
not obvious to the user. For example, if you tried to enter an integer value for an
instruction that expected a bit value (on/off), an error results. This feature helps
to minimize programming syntax errors.
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Basic Concepts for Programming an S7-200 CPU
The main points to consider when you select IEC 1131-3 instructions are:
It is usually easier to learn how to create programs for different brands of PLCs.
Fewer instructions are available (as specified by the standard) but you can
always use many of the SIMATIC instructions as well.
Some instructions operate differently than their SIMATIC counterparts (timers,
counters, multiply, divide, etc.)
These instructions may have longer execution times.
These instructions can only be used within the LAD and FBD editors.
IEC 1131-3 specifies that variables must be declared with a type and supports
system checking of data type.
SIMATIC and IEC 1131-3 Variable Data Types
Every SIMATIC and IEC 1131-3 instruction or parameterized subroutine is
identified by a precise definition referred to as a signature. For all standard
instructions, the allowable data types for each instruction operand is obtained from
the signature. For parameterized subroutines, the signature of the subroutine is
created by the user through the Local Variable Table.
STEP 7-Micro/WIN 32 implements simple data type checking for the SIMATIC
mode, and strong data type checking for the IEC 1131-3 mode. When a data type
is specified for either a local or global variable, STEP 7-Micro/WIN 32 ensures that
the operand data type matches the instruction signature to the level specified.
Table 4-2 defines elementary data types and Table 4-3 shows complex data types
available in STEP 7-Micro/WIN 32.
Table 4-2
IEC 1131-3 Elementary Data Types
Elementary Data Types
Description
Data Range
BOOL
Boolean
0 to 1
BYTE
Unsigned byte
0 to 255
WORD
Unsigned integer
0 to 65,535
INT
Signed integer
-32768 to +32767
DWORD
Unsigned double integer
0 to 232 - 1
DINT
Signed double integer
-231 to +231 - 1
REAL
IEEE 32-bit floating point
-1038 to +1038
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Table 4-3
IEC 1131-3 Complex Data Types
Complex Data Types
TON1
Description
On-Delay Timer
Address Range
1 ms
T32, T96
10 ms
T33 to T36, T97 to T100
100 ms T37 to T63, T101 to T255
TOF
Off-Delay Timer
1 ms
T32, T96
10 ms
T33 to T36, T97 to T100
100 ms T37 to T63, T101 to T255
TP
Pulse Timer (See
Note 1)
1 ms
T32, T96
10 ms
T33 to T36, T97 to T100
100 ms T37 to T63, T101 to T255
CTU
Up Counter
0 to 255
CTD
Down Counter
0 to 255
CTUD
Up/Down Counter
0 to 255
SR
Set Dominant
Bistable
--
RS
Reset Dominant
Bistable
--
1
The pulse timer function block uses TON timers to perform the pulse operation.
This will reduce the total number of available TON timers.
Data Type Checking There are three levels of data type checking: strong data
type checking, simple data type checking, and no data type checking.
Strong Data Type Checking In this mode, the parameter data type must match
the symbol or variable data type. Each formal parameter has only one data type
(except for overloaded instructions). For example, the IN parameter of a SRW
(Shift Right Word) instruction has the data type WORD. Only variables that are
assigned the WORD data type will compile successfully. Variables that are data
typed as INT are not valid for WORD instruction parameters when strong data type
checking is enforced.
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Strong data type checking is performed only within IEC 1131-3 modes. See
Table 4-4.
Table 4-4
Strong Data Type Checking User Selected and Equivalent Data Types
Equivalent Data Type
User Selected Data type
BOOL
BOOL
BYTE
BYTE
WORD
WORD
INT
INT
DWORD
DWORD
DINT
DINT
REAL
REAL
Simple Data Type Checking In the simple data type checking mode, when a
symbol or a variable is given a data type, it is also automatically assigned all data
types that match the bit size of the selected data type. For example, if you select
DINT as the data type, the local variable also automatically assigns the data type
DWORD because both are 32-bit data types. The data type REAL is not
automatically assigned, even though it is also a 32-bit data type. The data type
REAL is defined as having no other data type equivalent; it is always unique.
Simple data type checking is only performed within SIMATIC modes when you use
local variables. See Table 4-5.
Table 4-5
Simple Data Type Checking: User Selected and Equivalent Data Types
Equivalent Data Type
User Selected Data type
BOOL
BOOL
BYTE
BYTE
WORD
WORD, INT
INT
WORD, INT
DWORD
DWORD, DINT
DINT
DWORD, DINT
REAL
REAL
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Basic Concepts for Programming an S7-200 CPU
No Data Type Checking The no data type checking mode is available only for
SIMATIC global variables where the data types are not selectable. In this mode, all
data types of equivalent size are automatically assigned to the symbol. For
example, a symbol that is assigned the address VD100 is assigned the data types
shown in Table 4-6 automatically by STEP 7-Micro/WIN 32.
Table 4-6
Size Determined Data Type for SIMATIC Global Symbols
Assigned Equivalent Data Type
User Selected Address
V0.0
BOOL
VB0
BYTE
VW0
WORD, INT
VD0
DWORD, DINT, REAL
Advantages of Data Type Checking
Data type checking helps you to avoid common programming mistakes. If an
instruction supports signed numbers, STEP 7-Micro/WIN 32 will flag the use of an
unsigned number for an instruction operand. For example, the relation comparison
< I is a signed instruction. -1 is less than 0 for signed data type operands.
However, when the < I instruction is allowed to support an unsigned data type, the
programmer must ensure that the following never occurs. During run-time program
execution, an unsigned value of 40,000 is actually less than 0 for a < I instruction.
!
Warning
You should ensure that the use of the unsigned number for signed instructions
does not cross the positive and negative boundary.
Failure to ensure that unsigned numbers for signed instructions do not cross the
positive and negative boundary can create unpredictable results in your program
or controller operation.
Always ensure that the unsigned number for a signed instruction does not cross
the positive and negative boundary.
In summary, under the IEC 1131-3 editing mode, strong data type checking helps
you to identify these errors during compilation by generating errors for data types
that are illegal for the instruction. This capability is not available for the SIMATIC
editors.
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Basic Concepts for Programming an S7-200 CPU
Selecting Between SIMATIC and IEC 1131-3 Programming Modes
Since IEC 1131-3 is strongly data typed, and SIMATIC is not strongly data typed,
STEP 7-Micro/WIN 32 does not allow you to move programs between the two
different editing modes. You must choose a preferred editing mode.
Overloaded Instructions
Overloaded instructions support a range of data types. Strong data type checking
is still applied since all of the operand data types must match before the instruction
compiles successfully. Table 4-7 shows an example of the IEC overloaded ADD
instruction.
Table 4-7
Example of IEC Overloaded ADD Instruction
Instruction
Allowed Data Types
(Strong Data Type Checking)
Allowed Data Types
(Data Type Checking)
ADD
INT
WORD, INT
ADD
DINT
DWORD, DINT
ADD
REAL
REAL
Compiled Instruction
ADD_I (Add Integer)
ADD_D (Add Double Integer)
ADD_R (Add Real)
When all of the operands have the data type DINT, an Add Double Integer
instruction will be generated by the compiler. A compilation error occurs if data
types are mixed for the overloaded instruction. What is considered illegal depends
on the level of data type checking. The following example will generate a compiler
error under strong data type checking, but will pass compile for simple data type
checking.
ADD IN1 = INT, IN2 = WORD, IN3 = INT
Strong data type checking: compile error
Data type checking: compiles to ADD_I (Add Integer)
Like the relation contact comparison example, the simple data type checking will
not prevent common run-time programming errors from occurring. With simple
data type checking, the compiler will not catch the following common programming
errors: ADD 40000, 1 will be a negative number, not an unsigned 40,001.
Using Direct Addressing in IEC for Overloaded Instructions
IEC 1131-3 programming modes permit you to use directly represented memory
locations as a part of instruction parameter configuration. Both variables and
memory locations can be used within parameters. Remember that directly
represented memory locations do not contain explicit type information. Also, type
information cannot be determined from any of the overloaded IEC instructions,
because these instructions accept varying data types.
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Basic Concepts for Programming an S7-200 CPU
Data types for directly represented parameters are determined by examining other
typed parameters included within the instruction. When an instruction parameter
type is configured to use a variable that is of a specific type, all directly
represented parameters will be assumed to be of that type. Table 4-8 and
Table 4-9 show examples of data types for directly represented parameters.
Table 4-8
Example of Data Types for Direct Addressing
Address
Name
Comment
Var1
REAL
This is a floating-point variable.
Var2
DINT
This is a double integer variable.
Var3
INT
Table 4-9
Var1
%VD100
ADD
ENO
EN
IN1
OUT
IN2
Var2
%VD300
EN
IN1
IN2
Description
%VD200
VD100 and VD200 will be assumed to be of type REAL since
Var1 is of type REAL.
VD300 and VD400 will be assumed to be of type DINT since
Var2 is of type DINT.
ADD
Var3
%VW500
This is an integer variable.
Examples of Direct Addressing in Overloaded Instructions
Example
ENO
OUT
%VD400
ADD
EN
ENO
IN1
OUT
%VW600
VW500 and VW600 will be assumed to be of type INT since
Var3 is of type INT.
IN2
EN
ADD
ENO
Var1
IN1
OUT
%AC0
IN2
%AC0
%AC0
Data Type
EN
ADD
ENO
IN1
OUT
AC0 and AC1 will be assumed to be of type REAL since Var1
is of type REAL.
%AC1
%AC1
IN2
EN
ADD
ENO
%*AC0
IN1
OUT
%*AC0
IN2
%*AC1
This configuration is illegal since the type cannot be
determined. The type of data within the accumulators could
be any type.
This configuration is illegal since the type cannot be
determined. The type of data within the accumulator pointers
could be any type.
Using Conversion Instructions
Conversion instructions permit the movement from one data type to another.
STEP 7-Micro/WIN 32 supports the conversion instructions shown in Table 4-10
for moving values between the simple data types.
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Basic Concepts for Programming an S7-200 CPU
Table 4-10 Conversion Instructions
Conversion Instruction
Strong Data Type Checking
Allowed Operands
Data Type Checking
Allowed Operands
BYTE to INT
IN:
OUT:
BYTE
INT
IN:
OUT:
BYTE
WORD, INT
INT to BYTE
IN:
OUT:
INT
BYTE
IN:
OUT:
WORD, INT
BYTE
INT to DINT
IN:
OUT
DINT
DINT
IN:
OUT:
WORD, INT
DWORD, DINT
DINT to INT
IN:
OUT:
DINT
INT
IN:
OUT:
DWORD, DINT
WORD, INT
DINT to REAL
IN:
OUT:
DINT
REAL
IN:
OUT:
DWORD, DINT
REAL
REAL to DINT (ROUND)
IN:
OUT:
REAL
DINT
IN:
OUT:
REAL
DWORD, DINT
Under the IEC 1131-3 editing mode you can use the overloaded Move instruction
to convert between INT and WORD, and DINT and DWORD. The Move instruction
allows data types of the same size to be moved without the compiler generating
errors. See Table 4-11.
Table 4-11 Using Overloaded MOVE Instruction.
IEC 1131-3 Overloaded Move
IN
OUT
MOVE (INT to WORD)
INT
WORD
MOVE (WORD to INT)
WORD
INT
MOVE (DINT to DWORD)
DINT
DWORD
MOVE (DWORD to DINT)
DWORD
DINT
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Basic Concepts for Programming an S7-200 CPU
4.5
Basic Elements for Constructing a Program
The S7-200 CPU continuously executes your program to control a task or process.
You create this program with STEP 7-Micro/WIN 32 and download it to the CPU.
From the main program, you can call different subroutines or interrupt routines.
Organizing the Program
Programs for an S7-200 CPU are constructed from three basic elements: the main
program, subroutines (optional), and interrupt routines (optional). An S7-200
program is structured into the following organizational elements:
Main program: The main body of the program is where you place the
instructions that control your application. The instructions in the main program
are executed sequentially, once per scan of the CPU.
Subroutines: These optional elements of your program are executed only when
they are called from the main program.
Interrupt routines: These optional elements of your program are executed on
each occurrence of the interrupt event.
Example Program Using Subroutines and Interrupts
Following are sample programs for a timed interrupt that can be used for
applications such as reading the value of an analog input. In this example, the
sample rate of the analog input is set to 100 ms.
Figure 4-7 through Figure 4-11 show programs for using a subroutine and an
interrupt routine for the various S7-200 programming languages.
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Basic Concepts for Programming an S7-200 CPU
SIMATIC LAD
MAIN PROGRAM OB1
Network 1
SM0.1
SBR0
EN
SUBROUTINE 0
Network 1
SM0.0
100
MOV_B
EN ENO
IN OUT
ATCH
EN ENO
SMB34
0
10
ENI
INT
EVNT
INTERRUPT ROUTINE 0
Network 1
SM0.0
MOV_W
EN ENO
AIW4
Figure 4-7
IN
OUT
VW100
SIMATIC LAD Program for Using a Subroutine and an Interrupt Routine
Statement List
Main Program OB1
Network 1
LD
SM0.1
CALL
0
//When first scan cycle
//bit comes on
//Call subroutine 0.
Subroutine 0
Network 1
LD
SM0.0
MOVB 100, SMB34
AENO
ATCH
0, 10
AENO
ENI
//Always on memory bit.
//Set timed interrupt 0
//interval to 100 ms.
//If move is successful,
//attach timed interrupt 0
//to interrupt routine 0.
//If attach is successful,
//then enable Global Interrupt.
Interrupt Routine 0
//Begin interrupt routine 0.
Network 1
LD SM0.0
MOVW AIW4,VW100
Figure 4-8
//Always on memory bit.
//Sample Analog Input 4.
SIMATIC STL Program for Using a Subroutine and an Interrupt Routine
S7-200 Programmable Controller System Manual
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Basic Concepts for Programming an S7-200 CPU
SIMATIC FBD
MAIN PROGRAM OB1
Network 1
SM0.1
SBR0
EN
SUBROUTINE 0
Network 1
MOV_B
EN ENO
SM0.0
100
IN OUT
ATCH
EN ENO
SMB34
0
10
ENI
INT
EVENT
INTERRUPT ROUTINE 0
Network 1
SM0.0
AIW4
Figure 4-9
MOV_W
EN ENO
IN
OUT
VW100
SIMATIC FBD Program for Using a Subroutine and an Interrupt Routine
IEC LAD
MAIN PROGRAM
Network 1
%SM0.1
SBR0
EN
SUBROUTINE 0
Network 1
%SM0.0
MOVE
EN ENO
100
IN OUT
ATCH
EN ENO
0
INT
10
EVNT
%SMB34
ENI
INTERRUPT ROUTINE 0
Network 1
%SM0.0
MOVE
EN ENO
%AIW4
Figure 4-10
4-20
IN OUT
%VW100
IEC LAD Program for Using a Subroutine and an Interrupt Routine
S7-200 Programmable Controller System Manual
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Basic Concepts for Programming an S7-200 CPU
IEC FBD
MAIN PROGRAM OB1
Network 1
%SM0.1
SBR0
EN
SUBROUTINE 0
Network 1
%SM0.0
MOVE
EN ENO
100
IN OUT
ATCH
EN ENO
%SMB34
0
10
ENI
EN
INT
EVENT
INTERRUPT ROUTINE 0
Network 1
%SM0.0
MOVE
EN ENO
%AIW4
IN OUT
Figure 4-11
&VW100
IEC FBD Program for Using a Subroutine and an Interrupt Routine
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Basic Concepts for Programming an S7-200 CPU
4.6
Understanding the Scan Cycle of the CPU
The S7-200 CPU is designed to execute a series of tasks, including your program,
repetitively. This cyclical execution of tasks is called the scan cycle. During the
scan cycle shown in Figure 4-12, the CPU performs most or all of the following
tasks:
Reading the inputs
Executing the program
Processing any communication requests
Executing the CPU self-test diagnostics
Writing to the outputs
One Scan Cycle
Writing to the outputs
Executing the CPU self-test diagnostics
Reading the inputs
Executing the program
Processing any communications requests
Figure 4-12
Scan Cycle of the S7-200 CPU
The series of tasks executed during the scan cycle is dependent upon the
operating mode of the CPU. The S7-200 CPU has two modes of operation, STOP
mode and RUN mode. With respect to the scan cycle, the main difference between
STOP and RUN mode is that in RUN mode your program is executed, and in
STOP mode your program is not executed.
Reading the Digital Inputs
Each scan cycle begins by reading the current value of the digital inputs and then
writing these values to the process-image input register.
The CPU reserves the process-image input register in increments of eight bits (one
byte). If the CPU or expansion module does not provide a physical input point for
each bit of the reserved byte, you cannot reallocate these bits to subsequent
modules in the I/O chain or use them in your program. The CPU resets these
unused inputs to zero in the image register at the beginning of every scan.
However, if your CPU can accommodate several expansion modules and you are
not using this I/O capacity (have not installed the expansion modules), you can use
the unused expansion input bits as additional memory bits.
4-22
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Basic Concepts for Programming an S7-200 CPU
The CPU does not update analog inputs as part of the normal scan cycle unless
digital filtering of analog inputs is enabled. Digital filtering is provided as a user
selectable option and can be individually enabled for each analog input point.
Digital filtering is intended for use with low-cost analog modules that do not provide
filtering internal to the module. Digital filtering should be used in applications where
the input signal varies slowly with time. If the signal is a high-speed signal, then
digital filtering should not be enabled.
When analog input filtering is enabled for an analog input, the CPU updates that
analog input once per scan cycle, performs the filtering function, and stores the
filtered value internally. The filtered value is then supplied each time your program
accesses the analog input.
When analog filtering is not enabled for an analog input, the CPU reads the value
of the analog input from the physical module each time your program accesses the
analog input.
Executing the Program
During the execution phase of the scan cycle, the CPU executes your program,
starting with the first instruction and proceeding to the end instruction. The
immediate I/O instructions give you immediate access to inputs and outputs during
the execution of either the program or an interrupt routine.
If you use interrupts in your program, the interrupt routines that are associated with
the interrupt events are stored as part of the program. (See Section 4.5.) The
interrupt routines are not executed as part of the normal scan cycle, but are
executed when the interrupt event occurs (which may be at any point in the scan
cycle).
Processing the Communication Requests
During the message-processing phase of the scan cycle, the CPU processes any
messages that were received from the communications port.
Executing the CPU Self-Diagnostic Test
During this phase of the scan cycle, the CPU checks its firmware and your
program memory (RUN mode only). It also checks the status of any I/O modules.
Writing to the Digital Outputs
At the end of every scan cycle, the CPU writes the values stored in the
process-image output register to the digital outputs.
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Basic Concepts for Programming an S7-200 CPU
The CPU reserves the process-image output register in increments of eight bits
(one byte). If the CPU or expansion module does not provide a physical output
point for each bit of the reserved byte, you cannot reallocate these bits to
subsequent modules in the I/O chain.
When the CPU operating mode is changed from RUN to STOP, the digital outputs
are set to the values defined in the Output Table, or are left in their current state
(see Section 6.4). Analog outputs remain at the value last written. By default, the
digital outputs are turned off.
Interrupting the Scan Cycle
If you use interrupts, the routines associated with each interrupt event are stored
as part of the program. The interrupt routines are not executed as part of the
normal scan cycle, but are executed when the interrupt event occurs (which may
be at any point in the scan cycle). Interrupts are serviced by the CPU on a
first-come-first-served basis within their respective priority assignments.
Process-Image Input and Output Registers
It is usually advantageous to use the process-image register rather than to directly
access inputs or outputs during the execution of your program. There are three
reasons for using the image registers:
The sampling of all inputs at the top of the scan synchronizes and freezes the
values of the inputs for the program execution phase of the scan cycle. The
outputs are updated from the image register after the execution of the program
is complete. This provides a stabilizing effect on the system.
Your program can access the image register much quicker than it can access
I/O points, allowing faster execution of the program.
I/O points are bit entities and must be accessed as bits, but you can access the
image register as bits, bytes, words, or double words. Thus, the image registers
provide additional flexibility.
Immediate I/O
Immediate I/O instructions allow direct access to the actual input or output point,
even though the image registers are normally used as either the source or the
destination for I/O accesses. The corresponding process-image input register
location is not modified when you use an immediate instruction to access an input
point. The corresponding process-image output register location is updated
simultaneously when you use an immediate instruction to access an output point.
The CPU treats analog I/O as immediate data unless digital filtering of analog input
is enabled. See Section 6.5. When you write a value to an analog output, the
output is updated immediately.
4-24
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Basic Concepts for Programming an S7-200 CPU
4.7
Selecting the Mode of Operation for the CPU
The S7-200 CPU has two modes of operation:
STOP: The CPU is not executing the program. You can download a program or
configure the CPU when the CPU is in STOP mode.
RUN: The CPU is running the program.
The status LED on the front of the CPU indicates the current mode of operation.
You can change the mode of operation by:
Manually changing the mode switch located on the PLC
Using the STEP 7-Micro/WIN 32 programming software and setting the CPU
mode switch to TERM or RUN
Inserting a STOP instruction in your program
Changing the Operating Mode with the Mode Switch
You can use the mode switch (located under the front access door of the CPU) to
manually select the operating mode for the CPU:
Setting the mode switch to STOP mode stops the execution of the program.
Setting the mode switch to RUN mode starts the execution of the program.
Setting the mode switch to TERM (terminal) mode does not change the CPU
operating mode, but it does allow the programming software
(STEP 7-Micro/WIN 32) to change the CPU operating mode.
If a power cycle occurs when the mode switch is set to either STOP or TERM, the
CPU goes automatically to STOP mode when power is restored. If a power cycle
occurs when the mode switch is set to RUN, the CPU goes to RUN mode when
power is restored.
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Basic Concepts for Programming an S7-200 CPU
Changing the Operating Mode with STEP 7-Micro/WIN 32
As shown in Figure 4-13, you can use STEP 7-Micro/WIN 32 to change the
operating mode of the CPU. To enable the software to change the operating mode,
you must set the mode switch on the CPU to either TERM or RUN.
"
Project Edit View PLC Debug Tools Windows Help
RUN mode
Figure 4-13
STOP mode
Using STEP 7-Micro/WIN 32 to Change the Operating Mode of the CPU
Changing the Operating Mode from the Program
You can insert the STOP instruction in your program to change the CPU to STOP
mode. This allows you to halt the execution of your program based on the program
logic. For more information about the STOP instruction, see Chapter 9 for
SIMATIC instructions and Chapter 10 for IEC 1131-3 instructions.
4-26
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Basic Concepts for Programming an S7-200 CPU
4.8
Creating a Password for the CPU
All models of the S7-200 CPU provide password protection for restricting access to
specific CPU functions. A password authorizes access to the CPU functions and
memory: without a password, the CPU provides unrestricted access. When
password protected, the CPU prohibits all restricted operations according to the
configuration provided when the password was installed.
Restricting Access to the CPU
As shown in Table 4-12, S7-200 CPUs provide three levels of restricting access to
CPU functions. Each level allows certain functions to be accessible without a
password. For all three levels of access, entering the correct password provides
access to all of the CPU functions. The default condition for the S7-200 CPU is
level 1 (no restriction).
Entering the password over a network does not compromise the password
protection for the CPU. Having one user authorized to access restricted CPU
functions does not authorize other users to access those functions. Only one user
is allowed unrestricted access to the CPU at a time.
Note
After you enter the password, the authorization level for that password remains
effective for up to one minute after the programming device has been
disconnected from the CPU. If another user immediately connects to the CPU
within this time, he may have access to the programming device.
Table 4-12 Restricting Access to the S7-200 CPU
Task
Read and write user data
Start, stop and restart the CPU
Level 1
Not
restricted
ti t d
Level 2
Not
restricted
ti t d
Level 3
Not
restricted
ti t d
Read and write the time-of-day clock
Upload the user program, data, and the
configuration
Download to the CPU
Delete the user program, data, and the
configuration
Password
required
Password
required
i d
Force data or single/multiple scan
Copy to the memory cartridge
Write outputs in STOP mode
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Basic Concepts for Programming an S7-200 CPU
Configuring the CPU Password
You can use STEP 7-Micro/WIN 32 to create the password for the CPU. Select the
menu command View > System Block and click the Password tab. See
Figure 4-14. Enter the appropriate level of access for the CPU, then enter and
verify the password for the CPU.
System Block
Analog Input Filters
Ports(s)
Pulse Catch Bits
Retentive Ranges
Background Time
Output Table
Password
Input Filters
Full Privileges (Level 1)
Partial Privileges (Level 2)
Minimum Privileges (Level 3)
Password:
Verify:
Configuration parameters must be downloaded before they take effect.
Not all PLC types support every System Block option. Press F1 to see which
options are supported by each PLC.
OK
Figure 4-14
4-28
Cancel
Apply
Configuring a Password for the CPU
S7-200 Programmable Controller System Manual
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Basic Concepts for Programming an S7-200 CPU
What to Do If You Forget the CPU Password
If you forget the CPU password, you must clear the CPU memory and reload your
program. Clearing the CPU memory puts the CPU in STOP mode and resets the
CPU to the factory-set defaults, except for the CPU address, baud rate, and the
time-of-day clock.
To clear your program in the CPU, select the PLC > Clear... menu command to
display the Clear dialog box. Select all three blocks and confirm your action by
clicking the “OK” button. If you have a password configured, a
password-authorization dialog box is displayed. Entering the Clear password
(clearplc) allows you to continue the Clear All operation.
The Clear All operation does not remove the program from a memory cartridge.
Since the memory cartridge stores the password along with the program, you must
also reprogram the memory cartridge to remove the lost password.
!
Warning
Clearing the CPU memory causes the outputs to turn off (or in the case of an
analog output, to be frozen at a specific value).
If the S7-200 CPU is connected to equipment when you clear the CPU memory,
changes in the state of the outputs can be transmitted to the equipment. If you had
configured the “safe state” for the outputs to be different from the factory settings,
changes in the outputs could cause unpredictable operation of your equipment,
which could also cause death or serious injury to personnel, and/or damage to
equipment.
Always follow appropriate safety precautions and ensure that your process is in a
safe state before clearing the CPU memory.
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Basic Concepts for Programming an S7-200 CPU
4.9
Debugging and Monitoring Your Program
STEP 7-Micro/WIN 32 provides a variety of tools for debugging and monitoring
your program.
Using Single/Multiple Scans to Monitor Your Program
You can specify that the CPU execute your program for a limited number of scans
(from 1 scan to 65,535 scans). By selecting the number of scans for the CPU to
run, you can monitor the program as it changes the process variables. Use the
menu command Debug > Multiple Scans to specify the number of scans to be
executed. Figure 4-15 shows the dialog box for entering the number of scans for
the CPU to execute.
Execute Scans
Program Scan(s)
Execute
1
OK
Figure 4-15
4-30
Cancel
Executing Your Program for a Specific Number of Scans
S7-200 Programmable Controller System Manual
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Basic Concepts for Programming an S7-200 CPU
Using a Status Chart to Monitor and Modify Your Program
As shown in Figure 4-16, you can use a Status Chart to read, write, force, and
monitor variables while the program is running. Use the menu command View >
Status Chart.
S
The status chart toolbar icons are shown in the STEP 7-Micro/WIN 32 toolbar
area. These toolbar icons (Sort Ascending, Sort Descending, Single Read,
Write All, Force, Unforce, Unforce All, and Read All Forced) are enabled when
you select the status chart.
S
You can create multiple status charts.
S
To select a format for a cell, select the cell, then press the right mouse button to
enable the drop-down list (Figure 4-16).
Status Chart
Address
1 “Start_1”
2 “Start_2”
3 “Stop_1”
4 “Stop_2”
5 “High_Level”
6 “Low_Level”
7 “Reset”
8 “Pump_1”
9 “Pump_2”
10 “Mixer_Motor”
11 “Steam_Valve”
12 “Drain_Valve”
13 “Drain_Pump”
14 “Hi_Lev_Reached”
15 “Mix_Timer”
16 “Cycle_Counter”
Format
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Bit
Signed
Signed
Current Value
2#0
2#0
2#0
2#0
2#0
2#0
2#0
2#0
2#0
2#0
2#0
2#0
2#0
2#0
+0
+0
New Value
1
Cut
Copy
Paste
Force
Ctrl+X
Ctrl+C
Ctrl+V
Unforce
Insert
Delete
Define Symbol...
CHT1
Figure 4-16
Monitoring and Modifying Variables with a Status Chart
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Basic Concepts for Programming an S7-200 CPU
Displaying the Status of the Program in Ladder Logic
You can monitor the status of the ladder program by using STEP 7-Micro/WIN 32.
STEP 7-Micro/WIN 32 must be displaying ladder logic. Ladder status displays the
status of all instruction operand values. See Figure 4-17. All status is based upon
the value of these elements that are read at the end of a PLC scan cycle. STEP
7-Micro/WIN 32 acquires the values for the status display across multiple PLC
scan cycles and then updates the ladder status screen display. Consequently, the
ladder status display does not reflect the actual status of each ladder element of
the time of execution.
To open the LAD status window, select the status icon from the toolbar
(Figure 4-17).
LAD Program status (end of scan)
Tools Windows Help
SIMATIC LAD
Name
Start
Stop
High Level
Var Type
TEMP
TEMP
TEMP
Data Type
BOOL
BOOL
BOOL
Comment
Network 1 Fill the tank with Paint Ingredient 1 and monitor the tank level.
On
On
On
On
Off
OB1
Figure 4-17
4-32
Displaying the Status of a Program in Ladder Logic
S7-200 Programmable Controller System Manual
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Basic Concepts for Programming an S7-200 CPU
Displaying the Status of the Program in Function Block Diagram
You can monitor the status of the FBD program by using STEP 7-Micro/WIN 32.
STEP 7-Micro/WIN 32 must be displaying FBD. FBD status displays the status of
all instruction operand values. All status is based upon the values of operands that
were read at the end of a PLC scan cycle. STEP 7-Micro/WIN 32 acquires the
values for the status display across multiple PLC scan cycles and then updates the
FBD status screen display. Consequently, the FBD status display does not reflect
the actual status of each FBD element at the time of execution.
To open the FBD status window, select the status icon from the toolbar
(Figure 4-18).
FBD Program status (end of scan)
Tools Windows Help
SIMATIC FBD
Name
Var Type
Data Type
TEMP
TEMP
TEMP
Start
Stop
High Level
Comment
BOOL
BOOL
BOOL
Network 1
ON
OFF
AND
OFF
=
OB1
Figure 4-18
Displaying the Status of a Program in Function Block Diagram
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Basic Concepts for Programming an S7-200 CPU
Forcing Specific Values
The S7-200 CPU allows you to force any or all of the I/O points (I and Q bits). In
addition, you can also force up to 16 internal memory values (V or M) or analog I/O
values (AI or AQ). V memory or M memory values can be forced in bytes, words,
or double words. Analog values are forced as words only, on even-numbered byte
boundaries (such as AIW6 or AQW14). All forced values are stored in the
permanent EEPROM memory of the CPU.
Because the forced data might be changed during the scan cycle (either by the
program, by the I/O update cycle, or by the communications-processing cycle), the
CPU reapplies the forced values at various times in the scan cycle. Figure 4-19
shows the scan cycle, highlighting when the CPU updates the forced variables.
The Force function overrides an immediate-read or immediate-write instruction.
The Force function also overrides an output that was configured to go to a
specified value on transition to STOP mode: if the CPU goes to STOP mode, the
output reflects the forced value and not the configured value.
As shown in Figure 4-20, you can use the Status Chart to force values. To force a
new value, enter the value in the New Value column of the Status Chart, then
press the Force button on the toolbar. To force an existing value, highlight the
value in the Current Value column, then press the Force button.
Read the inputs
Write the outputs
Force values are applied to the inputs
as they are read.
Force values are applied to the
outputs as they are written.
Execute the program
Force values are applied to all
immediate I/O accesses.
One Scan Cycle
Execute the CPU self-test
diagnostics
Force values are applied for up to
16 memory values after the
program has been executed.
Process any communication requests
Force values are applied to all read/write communication accesses.
Figure 4-19
4-34
Scan Cycle of the S7-200 CPU
S7-200 Programmable Controller System Manual
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Basic Concepts for Programming an S7-200 CPU
Reads the forced values
from the CPU.
Unforces the current selection.
Tools Windows Help
Unforces all CPU
forced values.
Forces the current selection.
Status Chart
Address
1 “Start_1”
2 “Start_2”
3 “Stop_1”
4 “Stop_2”
5
6 VB100
7 VW100
8 VD100
9 VD100.1
10
11 VD0
12 VD4
13 VB8
14
15
16
Format
Bit
Bit
Bit
Bit
Signed
Current Value
2#0
2#0
2#0
2#0
Hexadecimal
Hexadecimal
Hexadecimal
16#01
16#0100
16#01000000
2#0
New Value
Indicates that this variable
is forced.
1
Indicates that only part of
this variable is forced.
Bit
Signed
+17789
Signed
Floating Point 3.214000
iabcdefghijk***
String
2#1
CHT1
Figure 4-20
Forcing Variables with the Status Chart
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Basic Concepts for Programming an S7-200 CPU
4.10
Error Handling for the S7-200 CPU
The S7-200 CPU classifies errors as either fatal errors or non-fatal errors. You can
use STEP 7-Micro/WIN 32 to view the error codes that were generated by the
error. Select PLC > Information from the menu bar to view these errors.
Figure 4-21 shows the dialog box that displays the error code and the description
of the error. Refer to Appendix B for a complete listing of the error codes.
In Figure 4-21, the Last Fatal field shows the previous fatal error code generated
by the CPU. This value is retained over power cycles if the RAM is retained. This
location is cleared whenever all memory of the CPU is cleared, or if the RAM is not
retained after a prolonged power outage.
The Total Fatal field is the count of fatal errors generated by the CPU since the last
time the CPU had all memory areas cleared. This value is retained over power
cycles if the RAM is retained. This location is cleared whenever all memory of the
CPU is cleared, or when the RAM is not retained after a prolonged power outage.
PLC Information
Operating Mode:
STOP
Versions
Scan Rates (ms)
PLC
CPU224 REL 1.00
0
0
0
Firmware
01.00
Minimum
ASIC
01.00
Maximum
Use the description and the code
for troubleshooting the possible
cause of the error.
Errors
Fatal
0
No fatal errors present.
Non-Fatal
0
No non-fatal errors present.
Last Fatal
0
No non-fatal errors present.
Total Fatal
0
Module
Type
Discrete
Points
I/O16 In/16 Out
Address
10.0 / ...
1
2
3
4
5
Status
Not present
Not present
Not present
Not present
Not present
DP Status...
Figure 4-21
4-36
Last
Reset Scan Rates
Close
CPU Information Dialog: Error Status Tab
S7-200 Programmable Controller System Manual
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Basic Concepts for Programming an S7-200 CPU
Responding to Fatal Errors
Fatal errors cause the CPU to stop the execution of your program. Depending
upon the severity of the fatal error, it can render the CPU incapable of performing
any or all functions. The objective for handling fatal errors is to bring the CPU to a
safe state from which the CPU can respond to interrogations about the existing
error conditions. When a fatal error is detected by the CPU, the CPU changes to
the STOP mode, turns on the System Fault LED and the STOP LED, and turns off
the outputs. The CPU remains in this condition until the fatal error condition is
corrected.
Once you have made the changes to correct the fatal error condition, you must
restart the CPU. You can restart the CPU by using one of these methods:
S
Turning the power off and then on
S
Changing the mode switch from RUN or TERM to STOP
S
Use STEP 7-Micro/WIN to restart the CPU. STEP 7-Micro/WIN 32 implements
the PLC > Power-Up Reset from the main menu bar. This forces the PLC to
restart and clear any fatal errors.
Restarting the CPU clears the fatal error condition and performs power-up
diagnostic testing to verify that the fatal error has been corrected. If another fatal
error condition is found, the CPU again sets the fault LED indicating that an error
still exists. Otherwise, the CPU begins normal operation.
There are several possible error conditions that can render the CPU incapable of
communication. In these cases, you cannot view the error code from the CPU.
These types of errors indicate hardware failures that require the CPU to be
repaired; they cannot be fixed by changes to the program or clearing the CPU
memory.
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Basic Concepts for Programming an S7-200 CPU
Responding to Non-Fatal Errors
Non-fatal errors can degrade some aspect of the CPU performance, but they do
not render the CPU incapable of executing your program or updating the I/O. As
shown in Figure 4-21, you can use STEP 7-Micro/WIN 32 to view the error codes
that were generated by the non-fatal error. There are three basic categories of
non-fatal errors:
S
Run-time errors. All non-fatal errors detected in RUN mode are reflected in
special memory (SM) bits. Your program can monitor and evaluate these bits.
Refer to Appendix C for more information about the SM bits used for reporting
non-fatal run-time errors.
At startup, the CPU reads the I/O configuration and stores this information in
the system data memory and in the SM memory. During normal operation, the
I/O status is periodically updated and stored in the SM memory. If the CPU
detects a difference in the I/O configuration, the CPU sets the
configuration-changed bit in the module-error byte; the I/O module is not
updated until this bit is reset. For the CPU to reset this bit, the module I/O must
again match the I/O configuration stored in the system data memory.
S
Program-compile errors. The CPU compiles the program as it downloads. If the
CPU detects that the program violates a compilation rule, the download is
aborted and an error code is generated. (A program that was already
downloaded to the CPU would still exist in the EEPROM and would not be lost.)
After you correct your program, you can download it again.
S
Program execution errors. Your program can create error conditions while the
program is being executed. For example, an indirect-address pointer that was
valid when the program compiled may be modified during the execution of the
program to point to an out-of-range address. This is considered a run-time
programming error. Use the dialog box shown in Figure 4-21 on page 4-36 to
determine what type of error occurred.
The CPU does not change to STOP mode when it detects a non-fatal error. It only
logs the event in SM memory and continues with the execution of your program.
However, you can design your program to force the CPU to STOP mode when a
non-fatal error is detected. Figure 4-22 shows a network of a program that is
monitoring an SM bit. This instruction changes the CPU to STOP mode whenever
an I/O error is detected.
Network 5
When an I/O error occurs (SM5.0), go to STOP mode.
SM5.0
STOP
Figure 4-22
4-38
Designing Your Program to Detect Non-Fatal Error Conditions
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CPU Memory: Data Types and Addressing
Modes
5
The S7-200 CPU provides specialized areas of memory to make the processing of
the control data faster and more efficient.
Chapter Overview
Section
Description
Page
5.1
Direct Addressing of the CPU Memory Areas
5-2
5.2
SIMATIC Indirect Addressing of the CPU Memory Areas
5-13
5.3
Memory Retention for the S7-200 CPU
5-15
5.4
Using Your Program to Store Data Permanently
5-20
5.5
Using a Memory Cartridge to Store Your Program
5-22
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5-1
CPU Memory: Data Types and Addressing Modes
5.1
Direct Addressing of the CPU Memory Areas
The S7-200 CPU stores information in different memory locations that have unique
addresses. You can explicitly identify the memory address that you want to access.
This allows your program to have direct access to the information.
Using the Memory Address to Access Data
To access a bit in a memory area, you specify the address, which includes the
memory area identifier, the byte address, and the bit number. Figure 5-1 shows an
example of accessing a bit (which is also called “byte.bit” addressing). In this
example, the memory area and byte address (I = input, and 3 = byte 3) are
followed by a period (“.”) to separate the bit address (bit 4).
MSB
I 3 . 4
LSB
7 6 5 4 3 2 1 0
Bit of byte, or bit number: bit 4 of 8 (0 to 7)
Period separates the byte address
from the bit number
Byte address: byte 3 (the fourth byte)
Area identifier (I = input)
MSB = most significant bit
LSB = least significant bit
Figure 5-1
5-2
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Accessing a Bit of Data in the CPU Memory (Byte.bit Addressing)
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CPU Memory: Data Types and Addressing Modes
You can access data in many CPU memory areas (V, I, Q, M, S, L, and SM) as
bytes, words, or double words by using the byte-address format. To access a byte,
word, or double word of data in the CPU memory, you must specify the address in
a way similar to specifying the address for a bit. This includes an area identifier,
data size designation, and the starting byte address of the byte, word, or
double-word value, as shown in Figure 5-2. Data in other CPU memory areas
(such as T, C, HC, and the accumulators) are accessed by using an address
format that includes an area identifier and a device number.
V B 100
MSB
7
VB100
LSB
0
Byte address
Access to a byte size
VB100
Area identifier (V memory)
Least significant byte
Most significant byte
MSB
15
VW100
8
Byte address
Access to a word size
LSB
0
7
VB100
V W 100
VB101
Area identifier (V memory)
Most significant byte
MSB
31
VD100
24
Least significant byte
23
VB100
16
VB101
15
LSB
0
8 7
VB102
VB103
V D 100
MSB =
LSB =
Figure 5-2
most significant bit
least significant bit
Byte address
Access to a double word size
Area identifier (V memory)
Comparing Byte, Word, and Double-Word Access to the Same Address
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5-3
CPU Memory: Data Types and Addressing Modes
Representation of Numbers
Table 5-1 shows the range of integer values that can be represented by the
different sizes of data.
Real (or floating-point) numbers are represented as 32-bit, single-precision
numbers whose format is: +1.175495E-38 to +3.402823E+38 (positive), and
-1.175495E-38 to -3.402823E+38 (negative). Real number values are accessed in
double-word lengths. Refer to ANSI/IEEE 754-1985 standard for more information
about real or floating-point numbers.
Table 5-1
Data Size Designations and Associated Integer Ranges
Unsigned Integer Range
D t Si
Data
Size
Decimal
Signed Integer Range
Hexadecimal
Decimal
Hexadecimal
B (Byte):
8-bit value
0 to 255
0 to FF
-128 to 127
80 to 7F
W (Word):
16-bit value
0 to 65,535
0 to FFFF
-32,768 to 32,767
8000 to 7FFF
D (Double word,
Dword):
32-bit value
0 to
4,294,967,295
0 to
FFFF FFFF
-2,147,483,648 to
2,147,483,647
8000 0000 to
7FFF FFFF
Addressing the Process-Image Input Register (I)
As described in Section 4.6, the CPU samples the physical input points at the
beginning of each scan cycle and writes these values to the process-image input
register. You can access the process-image input register in bits, bytes, words, or
double words.
Format:
Bit
Byte, Word, Double Word
I[byte address].[bit address]
I0.1
I[size][starting byte address] IB4
Addressing the Process-Image Output Register (Q)
At the end of the scan cycle, the CPU copies the values stored in the
process-image output register to the physical output points. You can access the
process-image output register in bits, bytes, words, or double words.
Format:
Bit
Byte, Word, Double Word
5-4
Q[byte address].[bit address]
Q1.1
Q[size][starting byte address] QB5
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CPU Memory: Data Types and Addressing Modes
Addressing the Variable (V) Memory Area
You can use V memory to store intermediate results of operations being performed
by the control logic in your program. You can also use V memory to store other
data pertaining to your process or task. You can access the V memory area in bits,
bytes, words, or double words.
Format:
Bit
Byte, Word, Double Word
V[byte address].[bit address]
V10.2
V[size][starting byte address] VW100
Addressing the Bit Memory (M) Area
You can use the bit memory area (M memory) as control relays to store the
intermediate status of an operation or other control information. While the name
“bit memory area” implies that this information is stored in bit-length units, you can
access the bit memory area not only in bits, but also in bytes, words, or double
words.
Format:
Bit
Byte, Word, Double Word
M26.7
M[byte address].[bit address]
M[size][starting byte address] MD20
Addressing the Sequence Control Relay (S) Memory Area
Sequence Control Relay bits (S) are used to organize machine operations or steps
into equivalent program segments. SCRs allow logical segmentation of the control
program. You can access the S bits as bits, bytes, words, or double words.
Format:
Bit
Byte, Word, Double Word
S[byte address].[bit address]
S3.1
S[size][starting byte address] SB4
Addressing the Special Memory (SM) Bits
The SM bits provide a means for communicating information between the CPU and
your program. You can use these bits to select and control some of the special
functions of the S7-200 CPU, such as:
A bit that turns on for the first scan cycle
Bits that toggle at fixed rates
Bits that show the status of math or operational instructions
For more information about the SM bits, see Appendix C. While the SM area is
based on bits, you can access the data in this area as bits, bytes, words, or double
words.
Format:
Bit
Byte, Word, Double Word
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SM[byte address].[bit address] SM0.1
SM[size][starting byte address] SMB86
5-5
CPU Memory: Data Types and Addressing Modes
Addressing the Local (L) Memory Area
The S7-200 PLCs provide 64 bytes of local (L) memory of which 60 can be used
as scratchpad memory or for passing formal parameters to subroutines. If you are
programming in either LAD or FBD, STEP 7-Micro/WIN 32 reserves the last four
bytes of local memory for its own use. If you program in STL, all 64 bytes of
L memory are accessible, but it is recommended that you do not use the last four
bytes of L memory.
Local memory is similar to V memory with one major exception. V memory has a
global scope while L memory has a local scope. The term global scope means that
the same memory location can be accessed from any program entity (main
program, subroutines, or interrupt routines). The term local scope means that the
memory allocation is associated with a particular program entity. The S7-200 PLCs
allocate 64 bytes of L for the main, 64 bytes for each subroutine nesting level, and
64 bytes for interrupt routines.
The allocation of L memory for the main cannot be accessed from subroutines or
from interrupt routines. A subroutine cannot access the L memory allocation of the
main, an interrupt routine, or another subroutine. Likewise, an interrupt routine
cannot access the L memory allocation of the main or of a subroutine.
The allocation of L memory is made by the S7-200 PLC on an as-needed basis.
This means that while the main portion of the program is being executed, the L
memory allocations for subroutines and interrupt routines do not exist. At the time
that an interrupt occurs or a subroutine is called, local memory is allocated as
required. The new allocation of L memory may reuse the same L memory locations
of a different subroutine or interrupt routine.
The L memory is not initialized by the PLC at the time of allocation and may
contain any value. When you pass formal parameters in a subroutine call, the
values of the parameters being passed are placed by the CPU in the appropriate
L memory locations of the called subroutine. L memory locations, which do not
receive a value as a result of the formal parameter passing step, will not be
initialized and may contain any value at the time of allocation.
You can access L memory as bits, bytes, words or double words. You can use
L memory as a pointer for indirect addressing but you cannot indirectly address
L memory.
Format:
Bit
Byte, Word, Double Word
5-6
L [byte address] . [bit address]
L [size] [starting byte address]
L0.0
LB33
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CPU Memory: Data Types and Addressing Modes
Addressing the Timer (T) Memory Area
In the S7-200 CPU, timers are devices that count increments of time. The S7-200
timers have resolutions (time-base increments) of 1 ms, 10 ms, or 100 ms. There
are two variables that are associated with a timer:
Current value: this 16-bit signed integer stores the amount of time counted by
the timer.
Timer bit: this bit is set or cleared as a result of comparing the current and the
preset value. The preset value is entered as part of the timer instruction.
You access both of these variables by using the timer address (T + timer number).
Access to either the timer bit or the current value is dependent on the instruction
used: instructions with bit operands access the timer bit, while instructions with
word operands access the current value. As shown in Figure 5-3, the Normally
Open Contact instruction accesses the timer bit, while the Move Word (MOV_W)
instruction accesses the current value of the timer. For more information about the
S7-200 instructions, see Chapter 9 for SIMATIC instructions and Chapter 10 for
IEC 1131-3 instructions.
Format:
T[timer number]
T24
Timer Bits (Read/Write)
Current Value
T3
Timer number (bit address)
Area identifier (timer)
MSB
15
MOV_W
EN
I2.1
T3
IN
OUT
T0
T1
T2
T3
T0
T1
T2
T3
Current Value of the Timer
(Read/Write)
VW200
Timer number
(current value address)
T0
T1
T2
T3
LSB
0
Timer Bits
T0
T1
T2
T3
Area identifier (timer)
Figure 5-3
Accessing the SIMATIC Timer Data
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5-7
CPU Memory: Data Types and Addressing Modes
Addressing the Counter (C) Memory Area
In the S7-200 CPU, counters are devices that count each low-to-high transition
event on the counter input(s). The CPU provides three types of counters: one type
counts up only, one type counts down, and one type counts both up and down.
There are two variables that are associated with a counter:
Current value: this 16-bit signed integer stores the accumulated count.
Counter bit: this bit is set or cleared as a result of comparing the current and
the preset value. The preset value is entered as part of the counter instruction.
You access both of these variables by using the counter address (C + counter
number). Access to either the counter bit or the current value is dependent on the
instruction used: instructions with bit operands access the counter bit, while
instructions with word operands access the current value. As shown in Figure 5-4,
the Normally Open Contact instruction accesses the counter bit, while the Move
Word (MOV_W) instruction accesses the current value of the counter. For more
information about the S7-200 instruction set, see Chapter 9 for SIMATIC
instructions and Chapter 10 for IEC 1131-3 instructions.
Format:
C[counter number]
C20
Counter Bits
(Read/Write)
C3
Current Value
MOV_W
EN ENO
I2.1
C3
IN
OUT
C0
C1
C2
C3
C0
C1
C2
C3
Counter number (bit address)
Area identifier (counter)
Current Value
(Read/Write)
C0
C1
C2
C3
MSB
15
VW200
Counter number
(current value address)
LSB
0
Counter
Bits
C0
C1
C2
C3
Area identifier (counter)
Figure 5-4
5-8
Accessing the SIMATIC Counter Data
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CPU Memory: Data Types and Addressing Modes
Addressing the Analog Inputs (AI)
The S7-200 converts a real-world, analog value (such as temperature or voltage)
into a word-length (16-bit) digital value. You access these values by the area
identifier (AI), size of the data (W), and the starting byte address. Since analog
inputs are words and always start on even-number bytes (such as 0, 2, or 4), you
access them with even-number byte addresses (such as AIW0, AIW2, or AIW4),
as shown in Figure 5-5. Analog input values are read-only values.
Format:
AIW[starting byte address]
AI W 8
MSB
LSB
15
AIW8
8
7
Byte address
0
byte 8
Access to a word-size value
byte 9
Most significant byte
Figure 5-5
AIW4
Area identifier (analog input)
Least significant byte
Accessing an Analog Input
Addressing the Analog Outputs (AQ)
The S7-200 converts a word-length (16-bit) digital value into a current or voltage,
proportional to the digital value (such as for a current or voltage). You write these
values by the area identifier (AQ), size of the data (W), and the starting byte
address. Since analog outputs are words and always start on even-number bytes
(such as 0, 2, or 4), you write them with even-number byte addresses (such as
AQW0, AQW2, or AQW4), as shown in Figure 5-6. Analog output values are
write-only values.
Format:
AQW[starting byte address]
MSB
LSB
15
AQW10
8
byte 10
Most significant byte
Figure 5-6
7
0
byte 11
Least significant byte
AQW4
AQ W 10
Byte address
Access to a word-size value
Area identifier (analog output)
Accessing an Analog Output
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CPU Memory: Data Types and Addressing Modes
Addressing the Accumulators (AC)
Accumulators are read/write devices that can be used like memory. For example,
you can use accumulators to pass parameters to and from subroutines and to
store intermediate values used in a calculation. The CPU provides four 32-bit
accumulators (AC0, AC1, AC2, and AC3). You can access the data in the
accumulators as bytes, words, or double words. As shown in Figure 5-7, to access
the accumulator as bytes or words you use the least significant 8 or 16 bits of the
value that is stored in the accumulator. To access the accumulator as a double
word, you use all 32 bits. The size of the data being accessed is determined by the
instruction that is used to access the accumulator.
Format:
AC[accumulator number]
AC0
Note
See Section 9.16, SIMATIC Communications Instructions, in Chapter 9 for
information about using the accumulators with interrupt routines.
MSB
7
MOV_B
EN ENO
AC2
IN
OUT
LSB
0
AC2 (accessed as a byte)
VB200
Accumulator number
Area identifier (Accumulator)
MSB
15
DEC_W
EN ENO
AC1
IN
OUT
8
LSB
0
7
Most significant Least significant
Byte 1
Byte 0
AC1 (accessed as a word)
VW100
Accumulator number
Area identifier (Accumulator)
INV_D
EN ENO
AC3
IN
OUT
MSB
31
5-10
16 15
Most significant
Byte 3
8
7
LSB
0
Least significant
Byte 2
Byte 1
Byte 0
VD250
Accumulator number
Area identifier (Accumulator)
Figure 5-7
24 23
AC3 (accessed as a double word)
Addressing the Accumulators
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CPU Memory: Data Types and Addressing Modes
Addressing the High-Speed Counters (HC)
High-speed counters are designed to count very high-speed events independent of
the CPU scan. High-speed counters have a signed, 32-bit integer counting value
(or current value). To access the count value for the high-speed counter, you
specify the address of the high-speed counter, using the memory type (HC) and
the counter number (such as HC0). The current value of the high-speed counter is
a read-only value and, as shown in Figure 5-8, can be addressed only as a double
word (32 bits).
Format:
HC[high-speed counter number] HC1
MSB
31
LSB
0
HC2
Most significant
Byte 3
Least significant
Byte 2
Byte 1
Byte 0
HC 2
High-speed counter number
Area identifier (high-speed counter)
Figure 5-8
Accessing the High-Speed Counter Current Values
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5-11
CPU Memory: Data Types and Addressing Modes
Using Constant Values
You can use a constant value in many of the S7-200 instructions. Constants can
be bytes, words, or double words. The CPU stores all constants as binary
numbers, which can then be represented in decimal, hexadecimal, ASCII or
floating point formats.
Decimal Format:
Hexadecimal Format:
ASCII Format:
Real or Floating-Point Format:
[decimal value]
16#[hexadecimal value]
.’[ASCII text]’
ANSI/IEEE 754-1985
The binary format is in the form of:
2#1010_0101_1010_0101
The S7-200 CPU does not support “data typing” or data checking (such as
specifying that the constant is stored as an integer, a signed integer, or a double
integer). For example, an Add instruction can use the value in VW100 as a signed
integer value, while an Exclusive Or instruction can use the same value in VW100
as an unsigned binary value.
The following examples show constants for decimal, hexadecimal, ASCII, and
floating point format:
5-12
Decimal constant:
20047
Hexadecimal constant:
16#4E4F
ASCII constant:
’Text goes between single
quotes.’
Real or floating-point format:
+1.175495E-38 (positive)
-1.175495E-38 (negative)
Binary format
2#1010_0101_1010_0101
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CPU Memory: Data Types and Addressing Modes
5.2
SIMATIC Indirect Addressing of the CPU Memory Areas
Indirect addressing uses a pointer to access the data in memory. The S7-200 CPU
allows you to use pointers to address the following memory areas indirectly: I, Q,
V, M, S, T (current value only), and C (current value only). You cannot address
individual bit or analog values indirectly.
Creating a Pointer
To address a location in memory indirectly, you must first create a pointer to that
location. Pointers are double word memory locations that contain the address of
another memory location. You can only use V memory locations, L memory
locations, or accumulator registers (AC1, AC2, AC3) as pointers. To create a
pointer, you must use the Move Double Word (MOVD) instruction to move the
address of the indirectly addressed memory location to the pointer location. The
input operand of the instruction must be preceded with an ampersand (&) to signify
that the address of a memory location, instead of its contents, is to be moved into
the location identified in the output operand of the instruction (the pointer).
Example:
MOVD
MOVD
MOVD
&VB100, VD204
&MB4, AC2
&C4, L6
Using a Pointer to Access Data
Entering an asterisk (*) in front of an operand for an instruction specifies that the
operand is a pointer. Using the example shown in Figure 5-9, *AC1 specifies that
AC1 is a pointer to the word-length value being referenced by the Move Word
(MOVW) instruction. In this example, the values stored in both V200 and V201 are
moved to accumulator AC0.
AC1
V199
address of VW200
V200
12
V201
34
V202
56
V203
78
MOVD &VW200, AC1
AC0
1234
MOVW *AC1, AC0
V204
Figure 5-9
Creates the pointer by
moving the address of
VB200 (address of
VW200’s initial byte) to
AC1.
Moves the word
value pointed to by
AC1 to AC0.
Using a Pointer for Indirect Addressing
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CPU Memory: Data Types and Addressing Modes
Modifying Pointers
You can change the value of a pointer. Since pointers are 32-bit values, use
double-word instructions to modify pointer values. Simple mathematical operations,
such as adding or incrementing, can be used to modify pointer values. Remember
to adjust for the size of the data that you are accessing:
When accessing bytes, increment the pointer value by one.
When accessing a word or a current value for a timer or counter, add or
increment the pointer value by two.
When accessing a double word, add or increment the pointer value by four.
Figure 5-10 shows an example of how you can create an indirect address pointer,
how data is accessed indirectly, and how you can increment the pointer.
AC1
V199
address of VW200
V200
12
V201
34
V202
56
V203
78
MOVD &VW200, AC1
AC0
1234
MOVW *AC1, AC0
V204
address of VW202
V200
12
V201
34
V202
56
V203
78
V204
AC0
INCD AC1
Increments the pointer
two times to point to the
next word location.
MOVW *AC1, AC0
Moves the word value
pointed to by AC1
(VW202) to AC0.
5678
Figure 5-10
5-14
Moves the word value
pointed to by AC1
(VW200) to AC0.
INCD AC1
AC1
V199
Creates the pointer by
moving the address of
VB200 (address of
VW200’s initial byte)
to AC1.
Modifying a Pointer When Accessing a Word Value
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CPU Memory: Data Types and Addressing Modes
5.3
Memory Retention for the S7-200 CPU
The S7-200 CPU provides several methods to ensure that your program, the
program data, and the configuration data for your CPU are properly retained. See
Figure 5-11.
The CPU provides an EEPROM to store permanently all of your program,
user-selected data areas, and the configuration data for your CPU.
The CPU provides a super capacitor that maintains the integrity of the RAM
after power has been removed from the CPU. Depending on the CPU, the
super capacitor can maintain the RAM for several days.
The CPU supports an optional battery cartridge that extends the amount of time
that the RAM can be maintained after power has been removed from the CPU.
The battery cartridge provides power only after the super capacitor has been
drained.
This section discusses the permanent storage and retention of the data in RAM
under a variety of circumstances.
RAM: maintained by the super capacitor
and the optional battery cartridge
EEPROM: provides
permanent storage
User program
User program
CPU configuration
CPU configuration
V memory
V memory
(permanent area)
M memory
Timer and Counter
current values
Figure 5-11
M memory
(permanent area)
Storage Areas of an S7-200 CPU
Downloading and Uploading Your Project
Your project consists of three elements: the user program, the data block
(optional), and the CPU configuration (optional). As shown in Figure 5-12,
downloading the project stores these elements in the RAM area of the CPU
memory. The CPU also automatically copies the user program, data block (DB1),
and the CPU configuration to the EEPROM for permanent storage.
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5-15
CPU Memory: Data Types and Addressing Modes
User program
CPU configuration
Data block (DB1): up to the
maximum V memory range
S7-200 CPU
User program
User program
CPU configuration
CPU configuration
User program
CPU configuration DB1
V memory
V memory
(permanent area)
M memory
M memory
(permanent area)
Timer and counter
current values
Figure 5-12
RAM
EEPROM
Downloading the Elements of the Project
When you upload a project from the CPU, as shown in Figure 5-13, the CPU
configuration is uploaded from the RAM to your computer. The user program and
the permanent V memory area are uploaded from the EEPROM to your computer
and the CPU configuration is uploaded from the RAM to your computer.
CPU configuration
S7-200 CPU
User program
User program
CPU configuration
CPU configuration
V memory
DB1
M memory
(permanent area)
M memory
Timer and counter
current values
Figure 5-13
5-16
V memory
(permanent area)
RAM
EEPROM
Uploading the Elements of the Project
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CPU Memory: Data Types and Addressing Modes
Automatically Saving the Data from the Bit Memory (M) Area When the CPU
Loses Power
If the first 14 bytes of M memory (MB0 to MB13) are configured to be retentive,
they are permanently saved to the EEPROM when the CPU loses power. As
shown in Figure 5-14, the CPU moves these retentive areas of M memory to the
EEPROM. In STEP 7-Micro/WIN 32, the default setting is set to off.
RAM
EEPROM (Permanent)
User program
User program
CPU configuration
CPU configuration
V memory
M memory
Timer and counter
current values
Figure 5-14
First 14 bytes of M memory
(MB0 to MB13), if configured to be
retentive, are copied to the
EEPROM when the CPU loses
power.
V memory
(permanent area)
M memory
(permanent area)
Saving Parts of Bit Memory (M) to EEPROM on Power Off
Retaining Memory on Power On
At power on, the CPU restores the user program and the CPU configuration from
the EEPROM memory. See Figure 5-15.
RAM
User program
CPU configuration
EEPROM (Permanent)
User program
User program
CPU configuration
CPU configuration
V memory
V memory
(permanent area)
M memory
M memory
(permanent area)
Timer and Counter
current values
Figure 5-15
Restoring the User Program and CPU Configuration on Power On
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5-17
CPU Memory: Data Types and Addressing Modes
At power on, the CPU checks the RAM to verify that the super capacitor
successfully maintained the data stored in RAM memory. If the RAM was
successfully maintained, the retentive areas of RAM are left unchanged. As shown
in Figure 5-16, the non-retentive areas of V memory are restored from the
corresponding permanent area of V memory in the EEPROM.
RAM
EEPROM (Permanent)
User program
User program
CPU configuration
The corresponding areas of
permanent V memory are copied
to the non-retentive areas of
V memory in RAM.
V memory
M memory
V memory
(permanent area)
M memory
(permanent area)
Timer and counter
current values
Figure 5-16
CPU configuration
All other non-retentive
areas of memory are
set to 0.
Restoring Program Data on Power On (Data Was Successfully Maintained in
RAM)
If the contents of the RAM were not maintained (such as after an extended power
failure), the CPU clears the RAM (including both the retentive and non-retentive
ranges) and sets the Retentive Data Lost memory bit (SM0.2) for the first scan
cycle following power on. As shown in Figure 5-17, the data stored in the
permanent EEPROM are then copied to the RAM.
RAM
EEPROM (Permanent)
User program
User program
CPU configuration
V memory (permanent area)
V memory
M memory
CPU configuration
V memory
(permanent area)
M memory (permanent area), if
defined as retentive
M memory
(permanent area)
Timer and counter
current values
All other areas of memory
are set to 0.
Figure 5-17
5-18
Restoring Program Data on Power On (Data Not Maintained in RAM)
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
CPU Memory: Data Types and Addressing Modes
Defining Retentive Ranges of Memory
You can define up to six retentive ranges to select the areas of memory you want
to retain through power cycles (see Figure 5-18). You can define ranges of
addresses in the following memory areas to be retentive: V, M, C, and T. For
timers, only the retentive timers (TONR) can be retained. In STEP 7-Micro/WIN 32
the default is that M memory is defined as non-retentive. The default disables the
power down save feature of the CPU.
Note
Only the current values for timers and counters can be retained: the timer and
counter bits are not retentive.
To define the retentive ranges for the memory areas, select the
View System Block menu command and click the Retentive Ranges tab. The
dialog box for defining specific ranges to be retentive is shown in Figure 5-18. To
obtain the default retentive ranges for your CPU, press the Defaults button.
System Block
Analog Input Filters
Port(s)
Retentive Ranges
Pulse Catch Bits
Password
Data Area
Offset
Background Time
Output Table
Input Filters
Number of
Elements
Defaults
Range 0: VB
0
5120
Clear
Range 1: VB
0
0
Clear
Range 2: T
0
32
Clear
Range 3: T
64
32
Clear
Range 4: C
0
256
Clear
Range 5: MB
14
18
Clear
Configuration parameters must be downloaded before they take effect.
Not all PLC types support every System Block option. Press F1 to see which options
are supported by each PLC.
OK
Figure 5-18
Cancel
Apply
Configuring the Retentive Ranges for the CPU Memory
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
5-19
CPU Memory: Data Types and Addressing Modes
5.4
Using Your Program to Store Data Permanently
You can save a value (byte, word, or double word) stored in V memory to
EEPROM. This feature can be used to store a value in any location of the
permanent V memory area.
A save-to-EEPROM operation typically affects the scan time by up to 5 ms. The
value written by the save operation overwrites any previous value stored in the
permanent V memory area of the EEPROM.
Note
The save-to-EEPROM operation does not update the data in the memory
cartridge.
Copying V Memory to the EEPROM
Special Memory Byte 31 (SMB31) and Special Memory Word 32 (SMW32)
command the CPU to copy a value in V memory to the permanent V memory area
of the EEPROM. Figure 5-19 shows the format of SMB31 and SMW32. Use the
following steps to program the CPU to save or write a specific value in V memory:
1. Load the V memory address of the value to be saved in SMW32.
2. Load the size of the data in SM31.0 and SM31.1. (See Figure 5-19.)
3. Set SM31.7 to 1.
At the end of every scan cycle, the CPU checks SM31.7; if SM31.7 equals 1, the
specified value is saved to the EEPROM. The operation is complete when the
CPU resets SM31.7 to 0. Do not change the value in V memory until the save
operation is complete.
MSB
7
SMB31
The CPU resets
SM31.7 after each
save operation.
sv
LSB
0
0 0
0
0
0 s1 s0
Size of value to be saved:
00 - byte
01 - byte
10 - word
11 - double word
Save to EEPROM:
0 = No
1 = Yes
MSB
15
SMW32
LSB
0
V memory address
Specify the V memory address as an offset from V0.
Figure 5-19
5-20
Format of SMB31 and SMW32
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
CPU Memory: Data Types and Addressing Modes
Limiting the Number of Programmed Saves to EEPROM
Since the number of save operations to the EEPROM is limited (100,000 minimum,
and 1,000,000 typical), you should ensure that only necessary values are saved.
Otherwise, the EEPROM can be worn out and the CPU can fail. Typically, you
perform save operations at the occurrence of specific events that occur rather
infrequently.
For example, if the scan time of the S7-200 is 50 ms and a value was saved once
per scan, the EEPROM would last a minimum of 5,000 seconds, which is less than
an hour and a half. On the other hand, if a value were saved once an hour, the
EEPROM would last a minimum of 11 years.
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
5-21
CPU Memory: Data Types and Addressing Modes
5.5
Using a Memory Cartridge to Store Your Program
The CPUs support an optional memory cartridge that provides a portable
EEPROM storage for your program. The CPU stores the following elements on the
memory cartridge:
User program
Data stored in the permanent V memory area of the EEPROM
CPU configuration
For more information about the memory cartridge, see Appendix A.
Copying to the Memory Cartridge
You can copy your program to the memory cartridge from the RAM only when the
CPU is powered on, the CPU is in STOP mode, and the memory cartridge is
installed.
!
Caution
Electrostatic discharge can damage the memory cartridge or the receptacle on the
CPU.
Make contact with a grounded conductive pad and/or wear a grounded wrist strap
when you handle the cartridge. Store the cartridge in a conductive container.
5-22
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
CPU Memory: Data Types and Addressing Modes
You can install or remove the memory cartridge while the CPU is powered on. To
install the memory cartridge, remove the plastic cover from the PLC, and insert the
memory cartridge on the PLC. (The memory cartridge is keyed for proper
installation.) After the memory cartridge is installed, use the following procedure to
copy the program.
1. If the program has not already been downloaded to the CPU, download the
program.
2. Use the menu command PLC Program Memory Cartridge to copy the
program to the memory cartridge. Figure 5-20 shows the elements of the CPU
memory that are stored on the memory cartridge.
3. Remove the memory cartridge (optional).
RAM
EEPROM (Permanent)
User program
User program
CPU configuration
User program
CPU configuration
CPU configuration
V memory
V memory
(permanent area)
M memory
M memory
(permanent area)
Timer and counter
current values
Memory
Cartridge
V memory (permanent area)
Figure 5-20
Copying the CPU Memory to the Memory Cartridge
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5-23
CPU Memory: Data Types and Addressing Modes
Restoring the Program and Memory with a Memory Cartridge
To transfer the program from a memory cartridge to the CPU, you must cycle the
power to the CPU with the memory cartridge installed. As shown in Figure 5-21,
the CPU performs the following tasks after a power cycle (when a memory
cartridge is installed):
The RAM is cleared.
The contents of the memory cartridge are copied to the RAM.
The user program, the CPU configuration, and the V memory area are copied
to the permanent EEPROM.
Note
Powering on a CPU with a blank memory cartridge, or a memory cartridge that
was programmed in a different model number CPU may cause an error. Memory
cartridges that were programmed by a CPU 221 or CPU 222 can be read by a
CPU 224. Memory cartridges that were programmed by a CPU 224 will be
rejected by a CPU 221 or CPU 222.
Remove the memory cartridge and power on again. The memory cartridge can
then be inserted and programmed.
RAM
EEPROM(Permanent)
User program
User program
CPU configuration
User program
CPU configuration
V memory (permanent area)
V memory
CPU configuration
V memory
(permanent area)
M memory
M memory
(permanent area)
Timer and counter
current values
All other areas of
memory are set to 0.
User program
CPU configuration
Memory
Cartridge
V memory (permanent area)
Figure 5-21
5-24
Restoring Memory on Power On (with Memory Cartridge Installed)
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
CPU and Input/Output Configuration
6
The inputs and outputs are the system control points: the inputs monitor the
signals from the field devices (such as sensors and switches), and the outputs
control pumps, motors, or other devices in your process. You can have local I/O
(provided by the CPU) or expansion I/O (provided by an expansion I/O module).
The S7-200 CPUs also provide high-speed I/O.
Chapter Overview
Section
Description
Page
6.1
Local I/O and Expansion I/O
6-2
6.2
Using the Selectable Input Filter to Provide Noise Rejection
6-4
6.3
Pulse Catch
6-5
6.4
Using the Output Table to Configure the States of the Outputs
6-8
6.5
Analog Input Filter
6-9
6.6
High-Speed I/O
6-10
6.7
Analog Adjustments
6-13
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6-1
CPU and Input/Output Configuration
6.1
Local I/O and Expansion I/O
The inputs and outputs are the system control points: the inputs monitor the
signals from the field devices (such as sensors and switches), and the outputs
control pumps, motors, or other devices in your process. You can have local I/O
(provided by the CPU) or expansion I/O (provided by an expansion I/O module):
The S7-200 CPU provides a certain number of digital local I/O points. For more
information about the amount of local I/O provided by your CPU, refer to the
specifications in Appendix A.
The S7-200 CPU 222 and CPU 224 support the addition of both digital and
analog expansion I/O. For more information about the capabilities of the
different expansion I/O modules, refer to the specifications in Appendix A.
Addressing the Local and Expansion I/O
The local I/O provided by the CPU provides a fixed set of I/O addresses. You can
add I/O points to the CPU by connecting expansion I/O modules to the right side of
the CPU, forming an I/O chain. The addresses of the points of the module are
determined by the type of I/O and the position of the module in the chain, with
respect to the preceding input or output module of the same type. For example, an
output module does not affect the addresses of the points on an input module, and
vice versa. Likewise, analog modules do not affect the addressing of digital
modules, and vice versa.
Discrete or digital expansion modules always reserve process-image register
space in increments of eight bits (one byte). If a module does not provide a
physical point for each bit of each reserved byte, these unused bits cannot be
assigned to subsequent modules in the I/O chain. For input modules, the unused
bits in reserved bytes are set to zero with each input update cycle.
Analog expansion modules are always allocated in increments of two points. If a
module does not provide physical I/O for each of these points, these I/O points are
lost and are not available for assignment to subsequent modules in the I/O chain.
6-2
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CPU and Input/Output Configuration
Examples of Local and Expansion I/O
Figure 6-1 and Figure 6-2 provide examples that show how different hardware
configurations affect the I/O numbering. Notice that some of the configurations
contain gaps in the addressing that cannot be used by your program.
CPU 221
Process-image I/O register assigned to physical I/O:
I0.0
I0.1
I0.2
I0.3
I0.4
I0.5
Figure 6-1
Q0.0
Q0.1
Q0.2
Q0.3
I/O Numbering Examples for a CPU 221
Module 0
Module 1
Module 3
4 In /
4 Out
8
In
8
Out
CPU 224
Process-image I/O register assigned to physical I/O:
I0.0
I0.1
I0.2
I0.3
I0.4
I0.5
I0.6
I0.7
I1.0
I1.1
I1.2
I1.3
I1.4
I1.5
Figure 6-2
Q0.0
Q0.1
Q0.2
Q0.3
Q0.4
Q0.5
Q0.6
Q0.7
Q1.0
Q1.1
I2.0
I2.1
I2.2
I2.3
Q2.0
Q2.1
Q2.2
Q2.3
I3.0
I3.1
I3.2
I3.3
I3.4
I3.5
I3.6
I3.7
Q3.0
Q3.1
Q3.2
Q3.3
Q3.4
Q3.5
Q3.6
Q3.7
I/O Numbering Examples for a CPU 224
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
6-3
CPU and Input/Output Configuration
6.2
Using the Selectable Input Filter to Provide Noise Rejection
The S7-200 CPUs allow you to select an input filter that defines a delay time
(selectable from 0.2 ms to 12.8 ms) for some or all of the local digital input points.
(See Appendix A for information about your particular CPU.) As shown in
Figure 6-3, each delay specification applies to groups of four input points. This
delay helps to filter noise on the input wiring that could cause inadvertent changes
to the states of the inputs.
The input filter is part of the CPU configuration data that is downloaded and stored
in the CPU memory. To configure the delay times for the input filter, use the menu
command View > System Block and click on the Input Filters tab.
System Block
Analog Input Filters
Port(s)
Retentive Ranges
Background Time
Pulse Catch Bits
Password
I0.0 - I0.3 4.40
ms
I0.4 - I0.7 4.40
ms
I1.0 - I1.3 4.40
ms
I1.4 - I1.5 4.40
ms
Output Table
Input Filters
Defaults
Configuration parameters must be downloaded before they take effect.
Not all PLC types support every System Block option. Press F1 to see
which options are supported by each PLC.
OK
Figure 6-3
6-4
Cancel
Apply
Configuring the Input Filters for Rejecting Noise
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
CPU and Input/Output Configuration
6.3
Pulse Catch
The S7-200 CPUs provide a pulse catch feature for each of the local digital inputs.
The pulse catch feature allows you to capture high-going pulses or low-going
pulses that are of such a short duration that they would not always be seen when
the CPU reads the digital inputs at the beginning of the scan cycle.
Pulse catch operation can be individually enabled on each of the local digital
inputs. When pulse catch is enabled for an input, a change in state of the input is
latched and held until the next input cycle update. In this way a pulse that lasts for
a short period of time is caught and held until the CPU reads the inputs, assuring
you that the pulse will not be missed. The basic operation of the PLC with and
without pulse catch enabled is shown in Figure 6-4.
CPU scan n
CPU scan n+1
Time
Input update
Input update
Input
Pulse catch
disabled
This pulse is missed because it
occurred between the input
updates
Pulse caught
Pulse catch
enabled
Figure 6-4
PLC Operation With and Without Pulse Catch
When using the pulse catch function, you must be sure to adjust the input filter
time so that the pulse is not removed by the filter. (The pulse catch function
operates on the input after it passes through the input filter.)
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C79000-G7076-C233-01
6-5
CPU and Input/Output Configuration
A block diagram of the digital input circuit is shown in Figure 6-5.
External
digital input
Optical
isolation
Pulse catch
function
Digital input
filter
Input to CPU
Pulse catch
enable
Figure 6-5
Digital Input Circuit
The response of an enabled pulse catch circuit to various input conditions is shown
in Figure 6-6.
CPU scan n
CPU scan n+1
Time
Input update
Input update
Input
Pulse catch
enabled
Input
Pulse catch
enabled
Input
Pulse catch
enabled
Figure 6-6
6-6
Pulse Catch Example
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
CPU and Input/Output Configuration
To access the pulse catch configuration screen, select the menu command
View > System Block from the main menu bar and click on the Pulse Catch Bits
tab. Figure 6-7 shows the Pulse Catch configuration screen. The default CPU
configuration and the default STEP 7-Micro/WIN 32 configuration are disabled for
all inputs.
System Block
Por(ts)
Retentive Ranges
Analog Input Filters
Password
Output Table
Background Time
Pulse Catch Bits
Defaults
Select desired inputs
7
6 5 4
Input Filters
3 2
1 0
I0.x
I1.x
Configuration parameters must be downloaded before they take effect.
Not all PLC types support every System Block option. Press F1 to see
which options are supported by each PLC.
OK
Figure 6-7
Cancel
Apply
Pulse Catch Configuration Screen
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C79000-G7076-C233-01
6-7
CPU and Input/Output Configuration
6.4
Using the Output Table to Configure the States of the Outputs
The S7-200 CPU provides the capability either to set the state of the digital output
points to known values upon a transition to the STOP mode, or to leave the
outputs in the state they were in before the transition to the STOP mode.
The output table is part of the CPU configuration data that is downloaded and
stored in the CPU memory.
The configuration of output values applies only to the digital outputs. Analog output
values are effectively frozen upon a transition to the STOP mode. The CPU does
not update the analog inputs or outputs as a system function. No internal memory
image is maintained for these points by the CPU.
To access the output table configuration dialog box, select the menu command
View > System Block and click on the Output Table tab. See Figure 6-8. You have
two options for configuring the outputs:
S
If you want to freeze the outputs in their last state, choose the Freeze Outputs
box and click on “OK.”
S
If you want to copy the table values to the outputs, then enter the output table
values. Click the checkbox for each output bit you want to set to On (1) after a
run-to-stop transition, and click on “OK” to save your selections.
The default values of the table are all zeroes.The default STEP 7-Micro/WIN 32
configuration and the default CPU configuration are disabled for all outputs.
System Block
Analog Input Filters
Port(s)
Retentive Ranges
Background Time
Pulse Catch Bits
Password
Output Table
Input Filters
Defaults
Freeze Outputs
7 6 5 4 3 2 1 0
7 6 5 4 3 2 1 0
Q8.x
Q0.x
Q9. x
Q1.x
Q10.x
Q2.x
These outputs
Q11.x
Q3.x
will be on after
Q12.x
a run-to-stop
Q4.x
transition.
Q13.x
Q5.x
Q14.x
Q6.x
Q15.x
Q7.x
Configuration parameters must be downloaded before they take effect.
Not all PLC types support every System Block option. Press F1 to
see which options are supported by each PLC.
OK
Figure 6-8
6-8
Cancel
Apply
Configuring the State of the Outputs
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C79000-G7076-C233-01
CPU and Input/Output Configuration
6.5
Analog Input Filter
With the CPU 222 and CPU 224, you can select software filtering on individual
analog inputs. The filtered value is the average value of the sum of a preselected
number of samples of the analog input. The filter specification (number of samples
and dead band) is the same for all analog inputs for which filtering is enabled.
The filter has a fast response feature to allow large changes to be quickly reflected
in the filter value. The filter makes a step function change to the latest analog input
value when the input exceeds a specified change from the average value. This
change is called the dead band and is specified in counts of the digital value of the
analog input.
Note
Be sure that analog filtering is appropriate for your application. Otherwise, disable
the analog input filter using the STEP 7-Micro/WIN 32 configuration screen shown
in Figure 6-9.
To access the analog input filter, select the menu command View > System Block
and click on the Analog Input Filters tab. Select the analog inputs that you want to
filter and click “OK.” See Figure 6-9. The default STEP 7-Micro/WIN 32
configuration is enabled for all inputs.
System Block
Port(s)
Retentive Ranges
Password
Output Table
Background Time
Pulse Catch Bits
Analog Input Filters
Input Filters
Defaults
Select which Analog Inputs to filter
AIW 14- 0
14
12
10
8
6
4
2
0
AIW 30 - 16
30
28
26
24
22
20
18
16
Number of samples
Deadband (16 - 4080)
320
0 = No Deadband
Configuration parameters must be downloaded before they take effect.
64
Not all PLC types support every System Block option. Press F1 to see
which options are supported by each PLC.
OK
Figure 6-9
Cancel
Apply
Analog Input Filter
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6-9
CPU and Input/Output Configuration
6.6
High-Speed I/O
Your S7-200 CPU provides high-speed I/O for controlling high-speed events. For
more information about the high-speed I/O provided by each CPU, refer to the
specifications in Appendix A.
High-Speed Counters
The S7-200 CPUs provide integrated high-speed counter functions that count
external events at rates up to 20 kHz without degrading the performance of the
CPU. Each of the high-speed counters is described below:
HSC0 and HSC4 are versatile counters that can be configured for one of eight
different counting modes of operation, including single-phase and two-phase
clock inputs.
HSC1 and HSC2 are versatile counters that can be configured for one of twelve
different counting modes of operation, including single-phase and two-phase
clock inputs.
HSC3 and HSC5 are simple counters that have one mode of operation
(single-phase clock inputs only).
Table 6-1 defines the modes of operations supported by high-speed counters
HSC0, HSC3, HSC4, and HSC5. All S7-200 CPUs support these high-speed
counters.
Table 6-1
High-Speed Counters HSC0, HSC3, HSC4, HSC5
HSC0
Mode
6-10
HSC3
HSC4
HSC5
I0.0
I0.1
I0.2
I0.1
I0.3
I0.4
I0.5
I0.4
0
Clk
-
-
Clk
Clk
-
-
Clk
1
Clk
-
Reset
-
Clk
-
Reset
-
2
-
-
-
-
-
-
-
-
3
Clk
Direction
-
-
Clk
Direction
-
-
4
Clk
Direction
Reset
-
Clk
Direction
Reset
-
5
-
-
-
-
-
-
-
-
6
Clk Up
Clk Down
-
-
Clk Up
Clk Down
-
-
7
Clk Up
Clk Down
Reset
-
Clk Up
Clk Down
Reset
-
8
-
-
-
-
-
-
-
-
9
Phase A
Phase B
-
-
Phase A
Phase B
-
-
10
Phase A
Phase B
Reset
-
Phase A
Phase B
Reset
-
11
-
-
-
-
-
-
-
-
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CPU and Input/Output Configuration
From this table you can see that if you are using HSC0 in modes 3 through 10
(Clock and Direction or any of the two-phase clocking modes), you cannot use
HSC3 because HSC0 and HSC3 both use I0.1. The same is true for HSC4 and
HSC5, which both use I0.4.
You can use I0.0 through I0.3 for high-speed counter inputs, or you can configure
these inputs to provide edge interrupt events. You cannot use these inputs as edge
interrupts and as high-speed counter inputs at the same time.
The same input cannot be used for two different functions; however, any input not
being used by the present mode of its high-speed counter can be used for another
purpose. For example, if HSC0 is being used in mode 2 which uses I0.0 and I0.2,
I0.1 can be used for edge interrupts or for HSC3.
Table 6-2 defines the modes of operations supported by high-speed counters
HSC1 and HSC2. Only the CPU 224 supports these high-speed counters.
Table 6-2
High-Speed Counters HSC1 and HSC2
HSC1
Mode
HSC2
I0.6
I0.7
I1.0
I1.1
I1.2
I1.3
I1.4
I1.5
0
Clk
-
-
-
Clk
-
-
-
1
Clk
-
Reset
-
Clk
-
Reset
-
2
Clk
-
Reset
Start
Clk
-
Reset
Start
3
Clk
Direction
-
-
Clk
Direction
-
-
4
Clk
Direction
Reset
-
Clk
Direction
Reset
-
5
Clk
Direction
Reset
Start
Clk
Direction
Reset
Start
6
Clk Up
Clk Down
-
-
Clk Up
Clk Down
-
-
7
Clk Up
Clk Down
Reset
-
Clk Up
Clk Down
Reset
-
8
Clk Up
Clk Down
Reset
Start
Clk Up
Clk Down
Reset
Start
9
Phase A
Phase B
-
-
Phase A
Phase B
-
-
10
Phase A
Phase B
Reset
-
Phase A
Phase B
Reset
-
11
Phase A
Phase B
Reset
Start
Phase A
Phase B
Reset
Start
Each counter has dedicated inputs for clocks, direction control, reset, and start,
where these functions are supported. In quadrature modes, an option is provided
to select one or four times the maximum counting rates. HSC1 and HSC2 are
completely independent of each other and do not affect other high-speed functions.
Both counters run at maximum rates without interfering with one another.
For more information about using the high-speed counters, see Section 9.5,
SIMATIC High-Speed Counter Instructions in Chapter 9.
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6-11
CPU and Input/Output Configuration
High-Speed Pulse Output
The S7-200 CPUs support high-speed pulse outputs. Q0.0 and Q0.1 can either
generate high-speed pulse train outputs (PTO) or perform pulse width modulation
(PWM) control.
The pulse train function provides a square wave (50% duty cycle) output for a
specified number of pulses and a specified cycle time. The number of pulses
can be specified from 1 to 4,294,967,295 pulses. The cycle time can be
specified in either microsecond or millisecond increments either from 50 µs to
65,535 µs or from 2 ms to 65,535 ms. Specifying any odd number of
microseconds or milliseconds (such as 75 ms) causes some duty cycle
distortion. The Pulse Train Output (PTO) function can be programmed to
produce one train of pulses or it can be programmed to produce a pulse profile
consisting of multiple trains of pulses. In the pulse profile mode of operation, the
PTO function can be programmed to control a stepper motor through a simple
ramp up, run, and ramp down sequence or more complicated sequences. The
pulse profile can consist of up to 255 segments with a segment corresponding
to the ramp up or run or ramp down operation.
The pulse width modulation function provides a fixed cycle time with a variable
duty cycle output. The cycle time and the pulse width can be specified in either
microsecond or millisecond increments. The cycle time has a range either from
50 µs to 65,535 µs or from 2 ms to 65,535 ms. The pulse width time has a
range either from 0 µs to 65,535 µs or from 0 ms to 65,535 ms. When the pulse
width is equal to the cycle time, the duty cycle is 100 percent and the output is
turned on continuously. When the pulse width is zero, the duty cycle is 0
percent and the output is turned off.
For more information about the high-speed outputs, see Section 9.5,
SIMATIC High-Speed Counter Instructions in Chapter 9.
6-12
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CPU and Input/Output Configuration
6.7
Analog Adjustments
The analog adjustment potentiometers are located under the front access cover of
the module. You can adjust these potentiometers to increase or decrease values
that are stored in bytes of Special Memory (SMB28 and SMB29). These read-only
values can be used by the program for a variety of functions, such as updating the
current value for a timer or a counter, entering or changing the preset values, or
setting limits.
SMB28 holds the digital value that represents the position of analog adjustment 0.
SMB29 holds the digital value that represents the position of analog adjustment 1.
The analog adjustment has a nominal range of 0 to 255 and a repeatability of ± 2
counts.
You use a small screwdriver to make the adjustments: turn the potentiometer
clockwise (to the right) to increase the value, and counterclockwise (to the left) to
decrease the value. Figure 6-10 shows an example program using the analog
adjustment.
LAD
I0.0
SMB28
Q0.0
/
VW100
T33
Figure 6-10
EN
B_I
ENO
IN
OUT
IN
T33
TON
PT
Q0.0
VW100
STL
Read analog
adjustment 0 and
save the
word-based value in
VW100.
LD
BTI
I0.0
SMB28, VW100
LDN
TON
Q0.0
T33, VW100
LD
=
T33
Q0.0
Use the word-based
value as a preset
for a timer. Turn on
Q0.0 when T33
reaches preset.
Example of Analog Adjustment
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CPU and Input/Output Configuration
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Setting Up Communications Hardware
and Network Communications
7
This chapter describes communications using STEP 7-Micro/WIN 32, version 3.0.
Previous versions of the software may operate differently. It also tells you how to
set up your communications hardware and how to set up an S7-200
communications network.
Chapter Overview
Section
Description
Page
7.1
What Are My Communication Choices?
7-2
7.2
Installing and Removing Communication Interfaces
7-7
7.3
Selecting and Changing Parameters
7-9
7.4
Communicating With Modems
7-16
7.5
Network Overview
7-27
7.6
Network Components
7-31
7.7
Using the PC/PPI Cable with Other Devices and Freeport
7-35
7.8
Network Performance
7-41
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7-1
Setting Up Communications Hardware and Network Communications
7.1
What Are My Communication Choices?
You can arrange the S7-200 CPUs in a variety of configurations to support network
communications. You can install the STEP 7-Micro/WIN 32 software on a personal
computer (PC) that has a Windows 95, Windows 98, or Windows NT operating
system, or you can install it on a SIMATIC programming device (such as a
PG 740). You can use the PC or the programming device as a master device in
any of the following communications configurations:
Single Master: A single master device is connected to one or more slave
devices. See Figure 7-1.
Multiple Master: A single master device is connected to one or more slave
devices and one or more master devices. See Figure 7-2.
For 11-bit modem users: A single master device is connected to one or more
slave devices. This master device is connected by means of 11-bit modems
either to one S7-200 CPU functioning as a slave device or to a network of
S7-200 CPUs functioning as slave devices.
For 10-bit modem users: A single master device is connected to only one
S7-200 CPU functioning as a slave device by means of a10-bit modem.
Figure 7-1 and Figure 7-2 show a configuration with a personal computer
connected to several S7-200 CPUs. STEP 7-Micro/WIN 32 is designed to
communicate with one S7-200 CPU at a time; however, you can access any CPU
on the network. The CPUs could be either slave or master devices. The TD 200 is
a master device. For detailed information on network communications, see
Section 7.5.
Network Connector
Station 0
S7-200 CPU
Station 2
PC/PPI
Cable
RS-485
S7-200 CPU
Station 3
RS-232
S7-200 CPU
Station 4
Figure 7-1
7-2
Using a PC/PPI Cable for Communicating with Several S7-200 CPUs
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Setting Up Communications Hardware and Network Communications
Master devices
TD 200
OP15
CPU 224
CP card
MPI cable
(RS-485)
CPU 221
CPU 224
CPU 221
CPU 224
Slave devices
Figure 7-2
Example of a CP Card with Master and Slave Devices
How Do I Choose My Communication Configuration?
Table 7-1 shows the possible hardware configurations and baud rates that
STEP 7-Micro/WIN 32 supports.
Table 7-1
Hardware Configurations Supported by STEP 7-Micro/WIN 32
Hardware
Supported
Type
PC/PPI
cable
Cable connector to
PC comm port
CP 5511
Type II,
PCMCIA-card
CP 5611
PCI-card (version
3 or greater)
MPI
Integrated in PG
PC ISA-card
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Baud Rate
Supported
9.6 kbaud
19.2 kbaud
Comments
Supports PPI protocol
Supports PPI, MPI, and PROFIBUS
protocols for notebook PCs
9.6 kbaud
19.2 kbaud
187 5 kbaud
187.5
Su orts PPI, MPI, and PROFIBUS
Supports
protocols for PCs
7-3
Setting Up Communications Hardware and Network Communications
Data Communications Using the CP or MPI Card
Siemens offers several network interface cards that you can put into a personal
computer or SIMATIC programming device. These cards allow the PC or SIMATIC
programming device to act as a network master. These cards contain dedicated
hardware to assist the PC or programming device in managing a multiple-master
network, and can support different protocols at several baud rates. See Table 7-1.
The specific card and protocol are set up using the PG/PC Interface from within
STEP 7-Micro/WIN 32. See Section 7.3. When using Windows 95, Windows 98, or
Windows NT, you can select any protocol (PPI, MPI, or PROFIBUS) to be used
with any of the network cards.
Each card provides a single RS-485 port for connection to the PROFIBUS
network. The CP 5511 PCMCIA card has an adapter that provides the 9-pin D port.
You connect one end of an MPI cable to the RS-485 port of the card and connect
the other end to a programming port connector on your network. See Figure 7-2.
For more information on the communications processor cards, see the SIMATIC
Components for Totally Integrated Automation Catalog ST 70.
From What Point Do I Set Up Communications?
You can set up communications from the following points in Windows 95,
Windows 98, or Windows NT 4.0:
During the final step of the installation of your STEP 7-Micro/WIN 32 software
Within STEP 7-Micro/WIN 32
7-4
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Setting Up Communications Hardware and Network Communications
How Do I Set Up Communications within STEP 7-Micro/WIN 32?
Within STEP 7-Micro/WIN 32, there is a Setup Communications dialog box that
you can use to configure your communications setup. You can use one of the
following ways to find this dialog box:
S
Select the menu command View > Communications.
S
Click the Communications icon on the STEP 7-Micro/WIN 32 screen (see
Figure 7-3).
"
Project Edit View PLC Debug Tools Windows Help
View
Program Block
Symbol Table
Status Chart
Data Block
System Block
Cross Reference
Communications
Figure 7-3
View Menu of STEP 7-Micro/WIN 32
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7-5
Setting Up Communications Hardware and Network Communications
In the Communications Setup dialog box, double-click the top icon on the
right-hand side. The Setting the PG/PC Interface dialog box appears. See
Figure 7-4.
Communications Links
Communications Setup
PC/PPI
cable
Address: 0
"
DoubleSetting
click the
icon representing the PLC
the PG/PC Interface
you
wish to communicate with.
Access Path
Double click
the Point
module
icon to change to
Access
of Application:
communication parameters.
Micro/WIN -->PC/PPI cable (PPI)
(Standard
for Micro/WIN)
Double click
the modem
icon to setup the
modem parameters or dial to start modem
Interface Parameter set used:
communications.
Properties...
PC/PPI cable (PPI)
Communication Parameters
Remote Address:
2
MPI-ISA on board (MPI)
MPI-ISA on board (PPI)
Local Address:
0
MPI-ISA Card (PROFIBUS)
Protocol: PC Adapter
PPI(MPI)
PC Adapter (PROFIBUS)PC/
Transmission
Rate:
9.6 bps
PPI
cable (PPI)
Module:
PC/PPI cable (COM 1)
(Assigning Parameters to a PC/PPI Cable
Mode
PC/PPI cable (COM 1)
for a PPI Network)
Copy...
Delete
Interfaces
Install...
OK
Figure 7-4
7-6
Cancel
Help
Setting the PG/PC Interface Dialog Box
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Setting Up Communications Hardware and Network Communications
7.2
Installing and Removing Communication Interfaces
You can install or remove communications hardware by using the Install/Remove
Interfaces dialog box shown in Figure 7-5. On the left side of this dialog box is a list
of hardware types that you have not installed yet. On the right side is a list of
currently installed hardware types. If you are using the Windows NT 4.0 operating
system, there is a “Resources” button under the Installed list box.
Installing the Hardware:
To install the hardware, follow these steps:
1. In the Setting the PG/PC Interface dialog box (shown in Figure 7-4), press the
“Install” button to access the Install/Remove Interfaces dialog box, shown in
Figure 7-5.
2. From the Selection list box, select the hardware type that you have. A
description of your selection is shown in the lower window.
3. Click the “Install -->” button.
4. When you are finished installing hardware, click the “Close” button. The Setting
the PG/PC Interface dialog box appears, and your selections are shown in the
Interface Parameter set used list box (see Figure 7-4).
Removing the Hardware:
To remove hardware, follow these steps:
1. Select the hardware from the Installed list box on the right.
2. Click the “<-- Remove” button.
3. When you are finished removing hardware, click the “Close” button. The Setting
the PG/PC Interface dialog box appears, and your selections are shown in the
Interface Parameter set used list box (see Figure 7-4).
Install/Remove Interfaces
Selection:
Installed:
CPU5412
CPU5511 (Plug & Play)
CPU5611 (Plug & Play)
MPI-ISA on board
PC Adapter (PC/MPI-Cable)
PC/PPI cable
PC/PPI cable
Install -->
<-- Remove
Resources...
This button appears
if you are using a
Windows NT
operating system.
PPI Access via Serial Interface
Close
Figure 7-5
Help
Install/Remove Interfaces Dialog Box
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7-7
Setting Up Communications Hardware and Network Communications
Special Hardware Installation Information for Windows NT Users
Installing hardware modules under the Windows NT operating system is slightly
different from installing hardware modules under Windows 95. Although the
hardware modules are the same for either operating system, installation under
Windows NT requires more knowledge of the hardware that you want to install.
Windows 95 tries automatically to set up system resources for you; however,
Windows NT does not. Windows NT provides you with default values only. These
values may or may not match the hardware configuration. However, these
parameters can be modified easily to match the required system settings.
When you have installed a piece of hardware, select it from the Installed list box
and click the “Resources” button (Figure 7-5). The Resources dialog box appears
(Figure 7-6). The Resources dialog box allows you to modify the system settings
for the actual piece of hardware that you installed. If this button is unavailable
(gray), you do not need to do anything more.
At this point you may need to refer to your hardware manual to determine the
setting for each of the parameters listed in the dialog box, depending on your
hardware settings. You may need to try several different interrupts in order to
establish communication correctly.
Resources - MPI-ISA Card<Board 1>
Memory Range:
#000CC000-000CC7FF
Input/Output Range:
Interrupt Request:
#15
Direct Memory Access:
# - Current hardware setting
* - Possible conflict with other hardware
OK
Figure 7-6
Cancel
Help
Resources Dialog Box for Windows NT
Note
If you are using Windows NT and a PC/PPI cable, no other master can be
present on the network.
7-8
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Setting Up Communications Hardware and Network Communications
7.3
Selecting and Changing Parameters
Selecting the Correct Interface Parameter Set and Setting It Up
When you have reached the Setting the PG/PC Interface dialog box, be sure that
“Micro/WIN” appears in the Access Point of Application list box (see Figure 7-4).
The Setting the PG/PC Interface box is common to several different applications,
such as STEP 7 and WinCC, so you may need to tell the program the application
for which you are setting parameters.
When you have selected “Micro/WIN” and have installed your hardware, you need
to set the actual properties for communicating with your hardware. The first step is
to determine the protocol that you want to use on your network. You should use
PPI protocol for all of your CPUs.
When you have decided what protocol you want to use, you can choose the
correct setup from the Interface Parameter set used list box in the Setting the
PG/PC Interface dialog box. This box lists each hardware type that you have
installed, along with the protocol type in parentheses. For example, a simple setup
might require you to use the PC/PPI cable to communicate with a CPU 222. In this
case, you select “PC/PPI cable(PPI).”
After you have selected the correct interface parameter set, you must set up the
individual parameters for the current configuration. Click the “Properties...” button
in the Setting the PG/PC Interface dialog box. This action takes you to one of
several possible dialog boxes, depending on the parameter set that you selected
(see Figure 7-7). The sections that follow describe each of these dialog boxes in
detail.
In summary, to select an interface parameter set, follow these steps:
1. In the Setting the PG/PC Interface dialog box (see Figure 7-4), select
“Micro/WIN” in the Access Point of Application list box in the Access Path tab.
2. Ensure that your hardware is installed. See Section 7.2.
3. Determine the protocol that you want to use. You should use PPI protocol for all
of your CPUs.
4. Select the correct setup from the Interface Parameter Set Used list box in the
Setting the PG/PC Interface dialog box.
5. Click the “Properties...” button in the Setting the PG/PC Interface dialog box.
From this point, you make selections according to the parameter set that you
chose.
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7-9
Setting Up Communications Hardware and Network Communications
Setting Up the PC/PPI Cable (PPI) Parameters
This section explains how to set up the PPI parameters for the Windows 95,
Windows 98, or Windows NT 4.0 operating systems, and for the PC/PPI cable.
From the Setting the PG/PC Interface dialog box, if you are using the PC/PPI
cable and you click the “Properties...” button, the properties sheet appears for
PC/PPI cable (PPI). See Figure 7-7.
STEP 7-Micro/WIN 32 defaults to multiple-master PPI protocol when
communicating to S7-200 CPUs. This protocol allows STEP 7-Micro/WIN 32 to
co-exist with other master devices (TD 200s and operator panels) on a network.
This mode is enabled by checking the “Multiple Master Network” check box on the
PC/PPI Cable Properties dialog in the PG/PC Interface. Windows NT 4.0 does not
support the multiple-master option.
STEP 7-Micro/WIN 32 also supports a single-master PPI protocol. When using the
single-master protocol, STEP 7-Micro/WIN 32 assumes that it is the only master
on the network and does not cooperate to share the network with other masters.
Single-master protocol should be used when transmitting over modems or over
very noisy networks. The single-master mode is selected by clearing the “Multiple
Master Network” check box on the PC/PPI Cable Properties dialog box in the
PG/PC Interface.
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Setting Up Communications Hardware and Network Communications
Follow these steps to set up the PPI parameters:
1. In the PPI tab, in the Station Parameters area, select a number in the Address
box. This number indicates where you want STEP 7-Micro/WIN 32 to reside on
the programmable controller network. The default station address for the
personal computer on which you are running STEP 7-Micro/WIN 32 is station
address 0. The default station address for the first PLC on your network is
station address 2. Each device (PC, PLC, etc.) on your network must have a
unique station address; do not assign the same address to multiple devices.
2. Select a value in the Timeout box. This value represents the length of time that
you want the communications drivers to spend to attempt to establish
connections. The default value should be sufficient.
3. Determine whether you want STEP 7-Micro/WIN 32 to participate on a network
that has multiple masters. You can leave the check mark in the Multiple Master
Network box, unless you are using a modem or Windows NT 4.0. In that case,
the box cannot be checked because STEP 7-Micro/WIN 32 does not support
that functionality.
4. Set the transmission rate at which you want STEP 7-Micro/WIN 32 to
communicate over the network. The PPI cable supports 9.6 kbaud and
19.2 kbaud.
5. Select the highest station address. This is the address where
STEP 7-Micro/WIN 32 stops looking for other masters on the network.
Setting the PG/PC Interface
Access Path
Properties
PC/PPI
cable (PPI)
Access
Point- of
Application:
PPI
Local Connection
Station Parameters
Address:
0
Timeout:
1s
Properties...
Network Parameters
Copy...
4 Multiple Master Network
Transmission Rate:
Delete
9.6 kbps
Highest Station Address:
31
OK
OK
Figure 7-7
Default
Cancel
Cancel
Help
Help
Properties - PC/PPI Cable (PPI) Dialog, PPI Tab
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7-11
Setting Up Communications Hardware and Network Communications
6. Click the Local Connection tab. See Figure 7-8.
7. In the Local Connection tab, select the COM port to which your PC/PPI cable is
connected. If you are using a modem, select the COM port to which the modem
is connected and select the Use Modem check box.
8. Click the “OK” button to exit the Setting the PG/PC Interface dialog.
"
Setting the PG/PC Interface
Access Path
Properties
cable (PPI)
Access
Point- PC/PPI
of Application:
Micro/WIN
cable (I
PPI -->PC/PPI
Local Connection
(Standard for Micro/WIN)
Interface Parameter set used:
COM port:
PC/PPI cable (PPI)
1
Properties...
MPI-ISA on board (MPI)
Use Modem
MPI-ISA on board (PPI)
MPI-ISA Card (PROFIBUS)
PC Adapter (MPI)
PC Adapter (PROFIBUS)PC/
PPI cable (PPI)
Copy...
Delete
(Assigning Parameters to a PC/PPI Cable
for a PPI Network)
Interfaces
OK
OK
Figure 7-8
Default
Cancel
Cancel
Help
Install...
Help
Properties - PC/PPI Cable (PPI) Dialog, Local Connection Tab
Configurations Using a PC with an MPI or CP Card: Multiple-Master Network
Many configurations are possible when you use a multipoint interface card or
communications processor card. Either card provides a single RS-485 port for
connection to the network using an MPI cable. You can have a station running the
STEP 7-Micro/WIN 32 programming software (PC with MPI or CP card, or a
SIMATIC programming device) connected to a network that includes several
master devices. (This is also true of the PC/PPI cable if you have enabled multiple
masters.) These master devices include operator panels and text displays (TD 200
units). Figure 7-9 shows a configuration with two TD 200 units added to the
network.
7-12
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Setting Up Communications Hardware and Network Communications
Note
If you are using the PPI parameter set, STEP 7-Micro/WIN 32 does not support
two different applications running on the same MPI or CP card at the same time.
Close the other application before connecting STEP 7-Micro/WIN 32 to the
network through the MPI or CP card.
In this configuration, the communication possibilities are listed below:
STEP 7-Micro/WIN 32 (on station 0) can be monitoring the status on
programming station 2, while the TD 200 units (stations 5 and 1) communicate
with the CPU 224 modules (stations 3 and 4, respectively).
Both CPU 224 modules can be enabled to send messages by using network
instructions (NETR and NETW).
Station 3 can read data from and write data to station 2 (CPU 222) and
station 4 (CPU 224).
Station 4 can read data from and write data to station 2 (CPU 222) and
station 3 (CPU 224).
It is possible to connect many master and slave stations to the same network.
However, the performance of the network can be adversely affected as more
stations are added.
Station 0
CPU 222
Station 2
CPU 224
Station 3
CPU 224
Station 4
TD 200
Station 1
TD 200
Station 5
MPI cable
(RS-485)
Apply termination and bias at stations 2 and 4. These stations are at the extreme ends of the network.
The connectors used at stations 2, 3 and 4 have a programming port connector.
Figure 7-9
Using an MPI or CP Card to Communicate with S7-200 CPUs
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Setting Up Communications Hardware and Network Communications
Setting Up the CP or MPI Card (PPI) Parameters
This section explains how to set up the PPI parameters for the Windows 95,
Windows 98 or Windows NT 4.0 operating systems and the following hardware:
CP 5511
CP 5611
MPI
From the Setting the PG/PC Interface dialog box, if you are using any of the MPI
or CP cards listed above along with the PPI protocol, and you click the
“Properties...” button, the properties sheet appears for XXX Card (PPI), where
“XXX” stands for the type of card you installed, for example, MPI-ISA. See
Figure 7-10.
Note
Use the MPI protocol when you are communicating to an S7-200 CPU 215, port 1.
For more information about the CPU 215 and the MPI protocol, see the previous
S7-200 Programmable Controller System Manual (order number
6ES7298-8FA01-8BH0).
Follow these steps to set up PPI parameters:
1. In the PPI tab, select a number in the Address box. This number indicates
where you want STEP 7-Micro/WIN 32 to reside on the programmable
controller network.
2. Select a value in the Timeout box. This value represents the length of time that
you want the communications drivers to spend to attempt to establish
connections. The default value should be sufficient.
3. Set the transmission rate at which you want STEP 7-Micro/WIN 32 to
communicate over the network.
4. Select the highest station address. This is the address where
STEP 7-Micro/WIN 32 stops looking for other masters on the network.
5. Click the “OK” button to exit the Setting the PG/PC Interface dialog box.
7-14
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Setting Up Communications Hardware and Network Communications
Properties - MPI-ISA Card (PPI)
PPI
Station Parameters
Address:
0
Timeout:
1s
Network Parameters
4 Multiple Master Network
Transmission Rate:
9.6 kbps
Highest Station Address:
31
OK
Figure 7-10
Default
Cancel
Help
MPI-ISA Card (PPI) Properties Sheet
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Setting Up Communications Hardware and Network Communications
7.4
Communicating With Modems
Setting Up the Communications Parameters When Using Modems
To set up communications parameters between your programming device or PC
and the CPU when using modems, you must use the module parameter set for the
PC/PPI cable. Otherwise, the Configure Modems function is not available. Ensure
that the Configure Modems function is enabled, and then set up the configuration
parameters by following these steps:
Note
STEP 7-Micro/WIN 32 displays predefined modems in the Modem Setup dialog
box. These modem types have been tested and verified to work with
STEP 7-Micro/WIN 32 at the settings displayed.
Setting Up The Local Modem:
1. Select the menu command View > Communications (or click on the
Communications icon).
In the Communications Setup dialog box, double click on the PC/PPI cable
icon, and the Setting the PG/PC Interface dialog box appears. Go on to step 3.
If the Communications Setup dialog box does not show the PC/PPI cable icon,
double-click the PC card icon or the top icon in the right-hand area.
2. In the Setting the PG/PC Interface dialog box, select PC/PPI cable(PPI). If this
selection is not in the list box, you must install it. See Section 7.2.
3. Click the “Properties” button. The PC/PPI cable(PPI) properties sheet for your
CPU and modem appears. See Figure 7-8.
4. In the Properties - PC/PPI cable (PPI) sheet, click the Local Connection tab.
5. In the COM Port area, ensure that the Use Modem box contains a check mark.
If the box is empty, select it to insert a check mark. See Figure 7-8.
6. Click the “OK” button. The Setting the PG/PC Interface dialog box appears.
7. Click the “OK” button. The Communications Setup dialog box appears. There
are now two modem icons and a Connect Modem icon (see Figure 7-11).
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Setting Up Communications Hardware and Network Communications
Communications Links
Communications Setup
Double click the icon representing the PLC
you wish to communicate with.
Double click the interface icon to change to
communication parameters.
Double click the modem icon to setup the
modem parameters or dial to start modem
communications.
Communication Parameters
Remote Address
2
Local Address
0
Module
PC/PPI cable (COM 1)
Protocol
PPI
PC/PPI cable
Address: 0
Bausch Induline IL 4K4
(11-bit, 9600 Baud, Predefined)
Connect Modem
(None Selected)
Double-Click
to Refresh
Transmission Rate 9.6 kbps
Mode
Figure 7-11
11-bit
Communications Setup Dialog Box
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Setting Up Communications Hardware and Network Communications
8. In the Communications Setup dialog box, double-click on the first modem icon.
The Modem Setup dialog box for the local modem appears (Figure 7-12).
9. In the Local Modem area, select your modem type. If your modem is not listed,
select the Add button to configure your modem. To do this, you must know the
AT commands for your modem. Refer to the documentation for your modem.
10.In the Communications Mode area, select the communications mode (either
10-bit or 11-bit). The communications mode that you select depends upon your
modem capabilities. (The 10-bit and 11-bit communications modes are
described later in this section.) Both the local and the remote modem must
have the same communications mode. Click the “Configure” button.
Communications Links
Communications Setup
PC/PPI cable
Address: 1
Double click the icon representing the PLC
you
wish to communicate with.
Bausch Induline IL 4K4
(11-bit, 9600 Baud, Predefined)
Double click the interface icon to change to
communication parameters.
Double click the modem icon to setup the
Modem
Setup or dial to start modem
modem
parameters
communications.
Communication
Local Modem
Parameters
Bausch Induline
Remote Address:
2 IL 14K4 (11-bit)
Remote Modem
Local Address:
PC/PPI cable (COM 1)
Protocol:
PPI
Add
Mode
(None Selected)
Double-Click
to Refresh
0
Module:
Transmission Rate:
ÂÂ
ÂÂ
Connect Modem
Remove...
Configure...
9.6 bps
Communications Mode
Note: Both Local and Remote Modems must communicate using
the same communications mode.
10-Bit Communications
11-Bit Communications
OK
Figure 7-12
7-18
Cancel
Modem Setup Dialog Box for the Local Modem
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Setting Up Communications Hardware and Network Communications
11. The Configure dialog box appears (Figure 7-13). If you are using a predefined
modem, the only field that you can edit in this dialog box is the Timeout area.
The timeout is the length of time that the local modem attempts to set up a
connection to the remote modem. If the time indicated in seconds in the
Timeout field elapses before the connection is set up, the attempt to connect
fails. If you are not using a predefined modem, you must enter the AT
command string for your modem. Refer to the documentation for your modem.
12.If you want to test the configuration of your local modem, click the
“Program/Test” button while the modem is connected to your local machine
(programming device or PC). This configures the modem to the current protocol
and settings, and verifies that the modem accepts the configuration settings.
Click ‘‘OK’’ to return to the Communications Setup dialog box.
13.Disconnect your local modem and connect your remote modem to your local
machine (programming device or PC).
Configure
Bausch Induline IL 14K4 (11-bit)
Initialization String
AT&F0&K0X3&D0
Communication String
*W=9600,8,E,1
Prefix
Suffix
^M
ATDT
Hangup String
ATH0
Timeout
30
Program/Test
Status
Advanced...
Figure 7-13
OK
Cancel
Local Modem Configuration
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
7-19
Setting Up Communications Hardware and Network Communications
Setting Up The Remote Modem:
1. In the Communications Setup dialog box, double-click on the second modem
icon (Figure 7-11). The Modem Setup dialog box for the remote modem
appears (Figure 7-14).
2. In the Remote Modem area, select your modem type. If your modem is not
listed, select the “Add” button to configure your modem. To do this, you must
know the AT commands for your modem. Refer to the documentation for your
modem.
3. In the Communications Mode area, select the communications mode (either
10-bit or 11-bit). The communications mode that you select depends upon your
modem capabilities. (The 10-bit and 11-bit communications modes are
described later in this section.) Both the local and the remote modem must
have the same communications mode. Click the “Configure” button.
4. The Configure dialog box appears (Figure 7-15). If you are using a predefined
modem there are no fields that you can edit. If you are not using a predefined
modem, you must enter the AT command string for your modem. Refer to the
documentation for your modem.
5. To test the configuration of your remote modem, click the “Program/Test” button
while the modem is connected to your local machine (programming device or
PC). This action transfers the parameters into a memory chip in the remote
modem.
6. Click the “OK” button. The Communications Setup dialog box appears.
Modem Setup
Local Modem
Remote Modem
Bausch Induline IL 14K4 (11-bit)
Add
Remove...
Configure...
Communications Mode
Note: Both Local and Remote Modems must communicate using
the same communications mode.
10-Bit Communications
11-Bit Communications
OK
Figure 7-14
7-20
Cancel
Modem Setup Dialog Box for Remote Modem
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Setting Up Communications Hardware and Network Communications
Configure
Bausch Induline IL 14K4 (11-bit)
Initialization String
AT&F08K0X3&D0
Communication String
*W=9600,8,E,1
Suffix
&Y0&W0^M
Program/Test
Status
Advanced...
Figure 7-15
OK
Cancel
Remote Modem Configuration
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
7-21
Setting Up Communications Hardware and Network Communications
7. Disconnect your remote modem from your local machine (your programming
device or PC).
8. Connect the remote modem to your S7-200 programmable controller.
9. Connect your local modem to your programming device or PC.
Connecting the Modems:
1. To connect your modem, double-click on the Connect Modem icon in the
Communications Setup dialog box. The Dial dialog box appears. See
Figure 7-16.
2. Enter the phone number in the Phone Number field of the Dial dialog box.
3. To connect the local modem to the remote modem, click the “Connect” button.
4. Your modem setup is complete.
Communications Links
Communications Setup
PC/PPI cable
Address: 0
Double click the icon representing the PLC
you wish to communicate with.
Bausch Induline IL 4K4
(11-bit, 9600 Baud, Predefined)
Double click the interface icon to change to
communication parameters.
Double click the modem icon to setup the
modem parameters or dial to start modem
communications.
Dial
Communication Parameters
2 Phone Number:
Remote Address:
Local Address:
PC/PPI cable (COM 1)
Protocol:
PPI
Transmission Rate:
Figure 7-16
7-22
ÂÂ
ÂÂ
0
Module:
Mode
Connect Modem
9.6 bps
Connect
(None Selected)
Double-Click
to Refresh
Cancel
11-bit
Connecting the Modems
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Setting Up Communications Hardware and Network Communications
Using a 10-Bit Modem to Connect an S7-200 CPU to a STEP 7-Micro/WIN 32
Master
Using STEP 7-Micro/WIN 32 on a PC with a Windows 95, Windows 98, or
Windows NT operating system, or using a SIMATIC programming device (such as
a PG 740) as a single-master device, you can connect to only one S7-200 CPU.
You can use a Hayes-compatible 10-bit modem to communicate to a single remote
S7-200 CPU.
You will need the following equipment:
A single S7-200 CPU as a slave device. The CPU 221, CPU 222, and CPU 224
support the 10-bit format. Previous S7-200 CPUs do not support the 10-bit
format.
An RS-232 cable to connect the PC or SIMATIC programming device to a
full-duplex,10-bit local modem
A 5-switch PC/PPI cable (set to the proper baud rate, 10-bit data
communications mode, and DTE mode) to connect the remote modem to the
CPU
An optional 9-pin to 25-pin adapter (if your modem connector requires it)
Note
The 4-switch PC/PPI cable does not support the 10-bit format.
RS-232
COMx
PG/
PC
25-pin to 9-pin
Adapter
Telephone line
Full-duplex
Full-duplex
RS-232
Note: x = your port number
Figure 7-17
10-bit
modem
10-bit
modem
Local
Remote
5-Switch
PC/PPI cable
CPU 224
RS-232
RS-485
S7-200 Data Communications Using a 10-Bit Modem with a 5-Switch PC/PPI
Cable
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
7-23
Setting Up Communications Hardware and Network Communications
This configuration allows only one master device and one slave device. In this
configuration, the S7-200 controller requires one start bit, eight data bits, no parity
bit, one stop bit, asynchronous communication, and a transmission speed of 9600
baud. The modem requires the settings listed in Table 7-2. Figure 7-18 shows the
pin assignments for a 25-Pin to 9-Pin Adapter.
Table 7-2
Modem
Modem Settings Required for a 10-Bit Modem
Data Format
in Bits
Transmission
Speed between
Modem and PC
Transmission
Speed on
the Line
Other Features
8 data
Ignore DTR signal
1 start
No hardware flow
control
10-Bit
10
Bit
9600 baud
9600 baud
1 stop
No software flow
control
t l
no parity
25-Pin to 9-Pin Adapter
25-pin
2
3
4
7
Figure 7-18
7-24
PC/PPI cable
9-pin
2
3
7
5
Pin Assignments for a 25-Pin to 9-Pin Adapter
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Setting Up Communications Hardware and Network Communications
Using an 11-Bit Modem to Connect an S7-200 CPU to a STEP 7-Micro/WIN 32
Master
Using STEP 7-Micro/WIN 32 on a PC with a Windows 95, Windows 98, or
Windows NT operating system, or on a SIMATIC programming device (such as a
PG 740) as a single-master device, you can connect to one or more S7-200 CPUs.
Most modems are not capable of supporting the 11-bit protocol.
Depending on whether you want to connect to only one S7-200 CPU or to a
network of them (see Figure 7-19), you need the following:
A standard RS-232 cable to connect the PC or SIMATIC programming device to
a full-duplex,11-bit local modem
One of the following PC/PPI cables:
– A 5-switch PC/PPI cable (set to the proper baud rate, the 11- bit data
communications mode, and the DTE mode) to connect the remote modem
to the CPU
– A 4-switch PC/PPI cable (set to the proper baud rate) and a null modem
adapter to connect the remote modem to the CPU
If there are multiple CPUs connected to the remote modem, you will need a
Siemens programming port connector on a PROFIBUS network (see
Figure 7-23 for the bias and termination of interconnecting cables).
RS-232
COMx
PG/
PC
25-pin to 9-pin
Adapter
Telephone line
Full-duplex
Full-duplex
Figure 7-19
11-bit
modem
11-bit
modem
RS-232
Note: x = your port number
Null modem 4-Switch
adapter PC/PPI cable
Local
Remote
CPU 224
RS-232
S7-200 Data Communications Using an 11-Bit Modem with a 4-Switch PC/PPI
Cable
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
7-25
Setting Up Communications Hardware and Network Communications
This configuration allows only one master device and supports only the PPI
protocol. In order to communicate through the PPI interface, the S7-200 PLC
requires that the modem use an 11-bit data string. In this mode, the S7-200
controller requires one start bit, eight data bits, one parity bit (even parity), one
stop bit, asynchronous communication, and a transmission speed of 9600 baud.
Many modems are not capable of supporting this data format. The modem
requires the settings listed in Table 7-3.
Figure 7-20 shows the pin assignments for a null modem adapter and a 25-Pin to
9-Pin Adapter.
Table 7-3
Modem Settings Required for an 11-Bit Modem
Data Format
in Bits
Modem
Transmission
Speed between
Modem and PC
Transmission
Speed on
the Line
8 data
Ignore DTR signal
1 start
No hardware flow
control
11-Bit
11
Bit
9600 baud
9600 baud
1 stop
No software flow
control
t l
1 parity (even)
Null Modem Adapter
25-Pin to 9-Pin Adapter
Modem
25-pin
25-pin
25-pin
2
3
4
5
6
7
8
20
2
3
4
7
2
3
4
5
6
7
8
20
Figure 7-20
7-26
Other Features
PC/PPI cable
9-pin
2
3
7
5
Pin Assignments for a Null Modem Adapter and a 25-Pin to 9-Pin Adapter
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Setting Up Communications Hardware and Network Communications
7.5
Network Overview
Network Masters
Figure 7-21 shows a configuration with a personal computer connected to several
S7-200 CPUs. STEP 7-Micro/WIN 32 is designed to communicate with one S7-200
CPU at a time; however, you can access any CPU on the network. The CPUs in
Figure 7-21 could be either slave or master devices. The TD 200 is a master
device.
Station 0
S7-200 CPU
Station 2
PC/PPI
Cable
RS-485
S7-200 CPU
Station 3
RS-232
S7-200 CPU
Station 4
TD 200
Station 5
Figure 7-21
Using a PC/PPI Cable for Communicating with Several S7-200 CPUs with the
Multiple Master Option Enabled
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
7-27
Setting Up Communications Hardware and Network Communications
Network Communication Protocols
The S7-200 CPUs support a variety of communication capabilities. Depending on
the S7-200 CPU that you use, your network can support one or more of the
following communication protocols:
Point-to-Point Interface (PPI)
Multipoint Interface (MPI)
PROFIBUS
These protocols are based upon the Open System Interconnection (OSI)
seven-layer model of communications architecture. The PPI and MPI protocols are
implemented on a token ring network which conforms to the Process Field Bus
(PROFIBUS) standard as defined in the European Standard EN 50170.
These protocols are asynchronous, character-based protocols with one start bit,
eight data bits, even parity, and one stop bit. Communication frames depend upon
special start and stop characters, source and destination station addresses, frame
length, and a checksum for data integrity. The three protocols can run on a
network simultaneously without interfering with each other as long as the baud rate
is the same for each of them.
The PROFIBUS network uses the RS-485 standard on twisted pair cables. This
allows up to 32 devices to be connected together on a network segment. Network
segments can be up to 1,200 m (3,936 ft.) in length, depending on the baud rate.
Network segments can be connected with repeaters to allow more devices on a
network and greater cable lengths. Networks can be up to 9,600 m (31,488 ft.)
using repeaters, depending on the baud rate. See Table 7-6.
The protocols define two types of network devices: masters and slaves. Master
devices can initiate a request to another device on the network. Slave devices can
only respond to requests from master devices. Slaves never initiate a request on
their own.
The protocols support 127 addresses (0 through 126) on a network. There can be
up to 32 master devices on a network. All devices on a network must have
different addresses in order to be able to communicate. SIMATIC programming
devices and PCs running STEP 7-Micro/WIN 32 have the default address of 0.
Operator panels such as the TD 200, OP3, and the OP7 default to address 1. The
programmable controllers have the default address of 2.
7-28
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C79000-G7076-C233-01
Setting Up Communications Hardware and Network Communications
PPI Protocol
PPI is a master/slave protocol. In this protocol the master devices (other CPUs,
SIMATIC programming devices, or TD 200s) send requests to the slave devices
and the slave devices respond. Slave devices do not initiate messages, but wait
until a master sends them a request or polls them for a response. All S7-200 CPUs
act as slave devices on the network.
Some S7-200 CPUs can act as master devices while they are in RUN mode, if you
enable PPI master mode in the user program. (See the description of SMB30 in
Appendix C.) Once PPI master mode has been enabled, you can read from or
write to other CPUs by using the Network Read (NETR) and Network Write
(NETW) instructions. See Section 9.16, SIMATIC Communications Instructions in
Chapter 9 for a description of these instructions. While acting as a PPI master, the
S7-200 CPU still responds as a slave to requests from other masters.
PPI has no limit on how many masters can communicate to any one slave CPU,
but there can be no more than 32 masters on a network.
MPI Protocol
MPI may be either a Master/Master protocol or a Master/Slave protocol. Exactly
how the protocol operates is based on the type of device. If the destination device
is an S7-300 CPU, then a master/master connection is established because all
S7-300 CPUs are network masters. If the destination device is an S7-200 CPU,
then a master/slave connection is established because the S7-200 CPUs are slave
devices.
MPI always establishes a connection between the two devices communicating with
each other. A connection is like a private link between the two devices. Another
master cannot interfere with a connection established between two devices. A
master can establish a connection to use for a short period of time, or the
connection can remain open indefinitely.
Because the connections are private links between devices and require resources
in the CPU, each CPU can only support a finite number of connections. Every CPU
supports four connections. Each CPU reserves two of its connections; one for a
SIMATIC programming device or PC, and one for operator panels. The reserved
connection for a SIMATIC programming device or PC enables you to always attach
at least one SIMATIC programming device or PC to the CPU. The CPUs also
reserve a connection for an operator panel. These reserved connections cannot be
used by other types of master devices (such as CPUs).
The S7-300 and S7-400 CPUs can communicate with the S7-200 CPUs by
establishing a connection on the non-reserved connections of the S7-200 CPU.
The S7-300s and S7-400s can read and write data to the S7-200s using the XGET
and XPUT instructions (refer to your S7-300 or S7-400 programming manuals).
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
7-29
Setting Up Communications Hardware and Network Communications
PROFIBUS Protocol
The PROFIBUS protocol is designed for high-speed communications with
distributed I/O devices (remote I/O). There are many PROFIBUS devices available
from a variety of manufacturers. These devices range from simple input or output
modules to motor controllers and programmable controllers.
PROFIBUS networks usually have one master and several slave I/O devices. The
master device is configured to know what types of I/O slaves are connected and at
what addresses. The master initializes the network and verifies that the slave
devices on the network match the configuration. The master writes output data to
the slaves and reads input data from them continuously. When a DP master
configures a slave device successfully, it then owns that slave device. If there is a
second master device on the network, it has very limited access to the slaves
owned by the first master.
User-Defined Protocols (Freeport)
Freeport communications is a mode of operation through which the user program
can control the communication port of the S7-200 CPU. Using Freeport mode, you
can implement user-defined communication protocols to interface to many types of
intelligent devices.
The user program controls the operation of the communication port through the
use of the receive interrupts, transmit interrupts, the transmit instruction (XMT) and
the receive instruction (RCV). The communication protocol is controlled entirely by
the user program while in Freeport mode. Freeport mode is enabled by means of
SMB30 (port 0) and is only active when the CPU is in RUN mode. When the CPU
returns to STOP mode, Freeport communications are halted and the
communication port reverts to normal PPI protocol operation. See Section 9.16,
SIMATIC Communications Instructions in Chapter 9 for a description of the
Transmit and Receive instructions.
7-30
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C79000-G7076-C233-01
Setting Up Communications Hardware and Network Communications
7.6
Network Components
The communication port on each S7-200 enables you to connect it to a network
bus. The information below describes this port, the connectors for the network bus,
the network cable, and repeaters used to extend the network.
Communication Port
The communication ports on the S7-200 CPUs are RS-485 compatible on a
nine-pin subminiature D connector in accordance with the PROFIBUS standard as
defined in the European Standard EN 50170. Figure 7-22 shows the connector that
provides the physical connection for the communication port, and Table 7-4
describes the communication port pin assignments.
Figure 7-22
Table 7-4
Socket 5
Socket 1
Socket 9
Socket 6
Pin Assignment for the S7-200 CPU Communication Port
S7-200 Communication Port Pin Assignments
Socket
PROFIBUS Designation
Port 0
1
Shield
Logic common
2
24 V Return
Logic common
3
RS-485 Signal B
RS-485 Signal B
4
Request-to-Send
RTS (TTL)
5
5 V Return
Logic common
6
+5 V
+5 V, 100 Ω series resistor
7
+24 V
+24 V
8
RS-485 Signal A
RS-485 Signal A
9
Not applicable
10-bit protocol select (input)
Shield
Chassis ground
Connector shell
S7-200 Programmable Controller System Manual
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7-31
Setting Up Communications Hardware and Network Communications
Network Connectors
Siemens offers two types of networking connectors that you can use to connect
multiple devices to a network easily. Both connectors have two sets of terminal
screws to allow you to attach the incoming and outgoing network cables. Both
connectors also have switches to bias and terminate the network selectively. One
connector type provides only a connection to the CPU. The other adds a
programming port (see Figure 7-23). See Appendix E for ordering information.
The connector with the programming port connection allows a SIMATIC
programming device or operator panel to be added to the network without
disturbing any existing network connections. The programming port connector
passes all signals from the CPU through to the programming port. This connector
is useful for connecting devices (such as a TD 200 or an OP3) which draw power
from the CPU. The power pins on the communication port connector of the CPU
are passed through to the programming port.
!
Caution
Interconnecting equipment with different reference potentials can cause unwanted
currents to flow through the interconnecting cable.
These unwanted currents can cause communication errors or can damage
equipment.
Be sure all equipment that you are about to connect with a communication cable
either shares a common circuit reference or is isolated to prevent unwanted
current flows. See “Grounding and Circuit Reference Point for Using Isolated
Circuits” in Section 2.3.
7-32
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Setting Up Communications Hardware and Network Communications
Switch position = On
Terminated and biased
Switch position = Off
No termination or bias
On
Network
connector with
programming
port
Off
Ä
Ä
TxD/RxD +
TxD/RxD -
A
220 Ω
390 Ω
Cable shield
Bare shielding
(~12 mm or 1/2 in.) must
contact the metal guides
of all locations.
3
8
5
1
B
TxD/RxD +
A
TxD/RxD Cable shield
TxD/RxD +
6
Switch position = On
Terminated and biased
Figure 7-23
A B AB
Interconnecting cable
Pin #
390 Ω
Ä
Ä
ABAB
Cable must be
terminated and biased
at both ends.
Network
connector
On
Ä
Ä
ÄÄ
ABAB
B
Switch position = On
Terminated and biased
Pin #
6
B
Network
connector
A
TxD/RxD -
3
8
Network
connector
5
1
Cable shield
Switch position = Off
No termination or bias
Bias and Termination of Interconnecting Cable
Cable for a PROFIBUS Network
Table 7-5 lists the general specifications for a PROFIBUS network cable. See
Appendix E for the Siemens order number for PROFIBUS cable meeting these
requirements.
Table 7-5
General Specifications for a PROFIBUS Network Cable
Specification
General Features
Type
Shielded, twisted pair
Conductor cross section
24 AWG (0.22 mm2) or larger
Cable capacitance
< 60 pF/m
Nominal impedance
100 Ω to 120 Ω
The maximum length of a PROFIBUS network segment depends on the baud rate
and the type of cable used. Table 7-6 lists the maximum segment lengths for cable
matching the specifications listed in Table 7-5.
Table 7-6
Maximum Cable Length of a Segment in a PROFIBUS Network
Transmission Rate
Maximum Cable Length of a Segment
9.6 kbaud to 19.2 kbaud
1,200 m (3,936 ft.)
187.5 kbaud
1,000 m (3,280 ft.)
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
7-33
Setting Up Communications Hardware and Network Communications
Network Repeaters
Siemens provides network repeaters to connect PROFIBUS network segments.
See Figure 7-24. The use of repeaters extends the overall network length, allows
you to add devices to a network, and/or provides a way to isolate different network
segments. PROFIBUS allows a maximum of 32 devices on a network segment of
up to 1,200 m (3,936 ft.) at 9600 baud. Each repeater allows you to add another 32
devices to the network and extend the network another 1,200 m (3,936 ft.) at
9600 baud. Up to 9 repeaters may be used in a network. Each repeater provides
bias and termination for the network segment. See Appendix E for ordering
information.
CPU
CPU
32 Devices/1,200 m (3,936 ft.)
Figure 7-24
7-34
Repeater
CPU
CPU
Repeater
32 Devices/1,200 m (3,936 ft.)
Network with Repeaters
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Setting Up Communications Hardware and Network Communications
7.7
Using the PC/PPI Cable with Other Devices and Freeport
You can use the PC/PPI cable and the Freeport communication functions to
connect the S7-200 CPUs to many devices that are compatible with the RS-232
standard.
There are two different types of PC/PPI cables:
An isolated PC/PPI cable with an RS-232 port that has 5 DIP switches for
setting baud rate and other configuration items (see Figure 7-26). For technical
specifications about the isolated PC/PPI cable, see Appendix A.
A non-isolated PC/PPI cable with a RS-232 port that has 4 DIP switches for
setting the baud rate. For technical specifications about the non-isolated
PC/PPI cable, refer to the previous S7-200 Programmable Controller System
Manual (order number 6ES7-298-8FA01-8BH0).
Both PC/PPI cables support baud rates between 600 baud and 38,400 baud. Use
the DIP switches on the housing of the PC/PPI cable to configure the cable for the
correct baud rate. Table 7-7 shows the baud rates and switch positions.
Table 7-7
Baud Rate Switch Selections on the PC/PPI Cable
Baud Rate
Switch (1 = Up)
38400
000
19200
001
9600
010
4800
011
2400
100
1200
101
600
110
The PC/PPI cable is in the transmit mode when data is transmitted from the
RS-232 port to the RS-485 port. The cable is in receive mode when it is idle or is
transmitting data from the RS-485 port to the RS-232 port. The cable changes
from receive to transmit mode immediately when it detects characters on the
RS-232 transmit line. The cable switches back to receive mode when the RS-232
transmit line is in the idle state for a period of time defined as the turnaround time
of the cable. This time depends on the baud rate selection made on the DIP
switches of the cable (see Table 7-8).
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
7-35
Setting Up Communications Hardware and Network Communications
If you are using the PC/PPI cable in a system where Freeport communication is
used, the turnaround time must be comprehended by the user program in the
S7-200 CPU for the following situations:
The S7-200 CPU responds to messages transmitted by the RS-232 device.
After receiving a request message from the RS-232 device, the transmission
of a response message by the S7-200 CPU must be delayed for a period of
time greater than or equal to the turnaround time of the cable.
The RS-232 device responds to messages transmitted from the S7-200 CPU.
After receiving a response message from the RS-232 device, the
transmission of the next request message by the S7-200 CPU must be
delayed for a period of time greater than or equal to the turnaround time of
the cable.
In both situations, the delay allows the PC/PPI cable sufficient time to switch from
transmit mode to receive mode so that data can be transmitted from the RS-485
port to the RS-232 port.
Table 7-8
7-36
PC/PPI Cable Turnaround Time (Transmit to Receive Mode)
Baud Rate
Turnaround Time (in Milliseconds)
38400
0.5
19200
1
9600
2
4800
4
2400
7
1200
14
600
28
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Setting Up Communications Hardware and Network Communications
Using a Modem with a 5-Switch PC/PPI Cable
You can use the 5-switch PC/PPI cable to connect the RS-232 communication port
of a modem to an S7-200 CPU. Modems normally use the RS-232 control signals
(such as RTS, CTS, and DTR) to allow a PC to control the modem. The PC/PPI
cable does not monitor any of these signals, but does provide RTS in DTE mode.
When you use a modem with a PC/PPI cable, the modem must be configured to
operate without these signals. As a minimum, you must configure the modem to
ignore DTR. Consult the operator manual supplied with the modem to determine
the commands required to configure the modem.
The RS-232 port of the 5-switch PC/PPI cable can be set to either the Data
Communications Equipment (DCE) or Data Terminal Equipment (DTE) mode. The
only signals present on this port are transmit data, Request to Send, receive data,
and ground. The 5-switch PC/PPI cable does not use or supply Clear to
Send (CTS). See Table 7-9 and Table 7-10 for the PC/PPI cable pin-outs.
A modem is classified as Data Communications Equipment (DCE). When you
connect a PC/PPI cable to a modem, the RS-232 port of the PC/PPI cable should
be set to Data Terminal Equipment (DTE), as selected by the DIP switch 5 on the
cable. This eliminates the need for a null modem adapter between the PC/PPI
cable and the modem. You may still require a 9-pin to 25-pin adapter (depending
on the connector on your modem). See Figure 7-25 for a typical setup and the pin
assignment for a 25-pin to 9-pin adapter.
RS-232
PC/PPI
cable
S7-200
Modem
25-pin to 9-pin
Adapter
9 pin
2
3
7
5
Figure 7-25
25 pin
2 TD
3 RD
4 RTS
7 GND
Pin Assignment for a 5-Switch PC/PPI cable With a Modem
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
7-37
Setting Up Communications Hardware and Network Communications
To set the mode to Data Communications Equipment (DCE), you should set
switch 5 to the 0 or down position (see Figure 7-26). To set the mode to Data
Terminal Equipment (DTE), you should set switch 5 to the 1 or up position.
Table 7-9 shows the pin numbers and functions for the RS-485 to RS-232 port of
the PC/PPI cable in DTE mode. Table 7-10 shows the pin numbers and functions
for the RS-485 to RS-232 port of the PC/PPI cable in DCE mode. You should note
that the PC/PPI cable supplies RTS only when it is in DTE mode.
Computer
DIP switch settings (down = 0, up = 1):
S7-200 CPU
1
RS-232
0
RS-485
PC/PPI cable
Isolated
PC/PPI Cable
PPI
1
0
Figure 7-26
7-38
1 2 3 4 5
Baud
Rate
38.4K
19.2K
9.6K
2.4K
1.2K
PC
123 SWITCH 4
000
001
010 SWITCH 5
100
101
1 = 10 BIT
0 = 11 BIT
1 = DTE
0 = DCE
Communicating with a CPU in PPI Mode
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Setting Up Communications Hardware and Network Communications
Switch 4 of the PC/PPI cable tells the S7-200 CPU to use either a 10-bit protocol
or the normal 11-bit PPI protocol. This switch setting has no use if the CPU is not
connected to STEP 7-Micro/WIN 32 and should be left in the 11-bit setting for
proper operation with other devices.
Table 7-9
Pin-outs for RS-485 to RS-232 DTE Connector
RS-232 DTE Connector Pin-out1
RS-485 Connector Pin-out
Pin
Number
1
Signal Description
Pin
Number
Signal Description
1
Ground (RS-485 logic ground)
1
Data Carrier Detect (DCD) (not used)
2
24 V Return (RS-485 logic ground)
2
Receive Data (RD)
(input to PC/PPI cable)
3
Signal B (RxD/TxD+)
3
Transmit Data (TD)
(output from PC/PPI cable)
4
RTS (TTL level)
4
Data Terminal Ready (DTR)
(not used)
5
Ground (RS-485 logic ground)
5
Ground (RS-232 logic ground)
6
+5 V (with 100 Ω series resistor)
6
Data Set Ready (DSR) (not used)
7
24 V Supply
7
Request To Send (RTS)
(output from PC/PPI cable)
8
Signal A (RxD/TxD-)
8
Clear To Send (CTS) (not used)
9
Protocol select
9
Ring Indicator (RI) (not used)
A conversion from female to male, and a conversion from 9-pin to 25-pin is required for modems
Table 7-10 Pin-outs for RS-485 to RS-232 DCE Connector
RS-485 Connector Pin-out
Pin
Number
Signal Description
RS-232 DCE Connector Pin-out
Pin
Number
Signal Description
1
Ground (RS-485 logic ground)
1
Data Carrier Detect (DCD) (not used)
2
24 V Return (RS-485 logic ground)
2
Receive Data (RD)
(output from PC/PPI cable)
3
Signal B (RxD/TxD+)
3
Transmit Data (TD)
(input to PC/PPI cable)
4
RTS (TTL level)
4
Data Terminal Ready (DTR)
(not used)
5
Ground (RS-485 logic ground)
5
Ground (RS-232 logic ground)
6
+5 V (with 100 Ω series resistor)
6
Data Set Ready (DSR) (not used)
7
24 V Supply
7
Request To Send (RTS) (not used)
8
Signal A (RxD/TxD-)
8
Clear To Send (CTS) (not used)
9
Protocol select
9
Ring Indicator (RI) (not used)
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
7-39
Setting Up Communications Hardware and Network Communications
Using a Modem with a 4-Switch PC/PPI Cable
You can use a 4-switch PC/PPI cable to connect the RS-232 communication port
of a modem to an S7-200 CPU. Modems normally use the RS-232 control signals
(such as RTS, CTS, and DTR) to allow a PC to control the modem. This PC/PPI
cable does not use any of these signals, so when you use a modem with a
4-switch PC/PPI cable, the modem must be configured to operate without these
signals. As a minimum, you must configure the modem to ignore RTS and DTR.
Consult the operator manual supplied with the modem to determine the commands
required to configure the modem.
A modem is classified as Data Communications Equipment (DCE). The RS-232
port of the 4-switch PC/PPI cable is also classified as DCE. When you connect two
devices of the same class (both DCE), the transmit data and receive data pins
must be swapped. A null modem adapter swaps these lines. See Figure 7-27 for a
typical setup and the pin assignment for a null modem adapter.
PC/PPI
cable
RS-232
S7-200
Modem
Null modem
9-pin to 25-pin adapter
9 pin
2
3
5
Figure 7-27
7-40
25 pin
2 TD
3 RD
4 RTS
5 CTS
6 DSR
8 DCD
20 DTR
7 GND
11-Bit Modem with a Combination Null Modem and a 9-pin to 25-pin Adapter
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Setting Up Communications Hardware and Network Communications
7.8
Network Performance
Optimizing Network Performance
The two factors which have the greatest effect on network performance are the
baud rate and the number of masters. Operating the network at the highest baud
rate supported by all devices has the greatest effect on the network. Minimizing the
number of masters on a network also increases the performance of the network.
Each master on the network increases the overhead requirements of the network.
Fewer masters lessen the overhead.
The following factors also affect the performance of the network:
Selection of master and slave addresses
Gap update factor
The addresses of the master devices should be set so that all of the masters are at
sequential addresses with no gaps between addresses. Whenever there is an
address gap between masters, the masters continually check the addresses in the
gap to see if there is another master wanting to come online. This checking
requires time and increases the overhead of the network. If there is no address
gap between masters, no checking is done and so the overhead is minimized.
Slave addresses may be set to any value without affecting network performance as
long as the slaves are not between masters. Slaves between masters increase the
network overhead in the same way as having address gaps between masters.
The S7-200 CPUs can be configured to check address gaps only on a periodic
basis. This checking is accomplished by setting the gap update factor (GUF) in the
CPU configuration for a CPU port with STEP 7-Micro/WIN 32. The GUF tells the
CPU how often to check the address gap for other masters. A GUF of one tells the
CPU to check the address gap every time it holds the token. A GUF of two tells the
CPU to check the address gap once every two times it holds the token. Setting a
higher GUF reduces the network overhead if there are address gaps between
masters. If there are no address gaps between masters, the GUF has no effect on
performance. Setting a large number for the GUF causes long delays in bringing
masters online since addresses are checked less frequently. The GUF is only used
when a CPU is operating as a PPI master.
The highest station address (HSA) defines the highest address at which a master
should look for another master. Setting an HSA limits the address gap which must
be checked by the last master (highest address) in the network. Limiting the size of
the address gap minimizes the time required to find and bring online another
master. The highest station address has no effect on slave addresses. Masters
can still communicate with slaves which have addresses greater than the HSA.
The HSA is only used when a CPU is operating as a PPI master. The HSA can be
set in the CPU configuration for a CPU port with STEP 7-Micro/WIN 32.
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
7-41
Setting Up Communications Hardware and Network Communications
As a general rule, you should set the highest station address on all masters to the
same value. This address should be greater than or equal to the highest master
address. The S7-200 CPUs default to a value of 31 for the highest station address.
Token Rotation
In a token-passing network, the station that holds the token is the only station that
has the right to initiate communication. Therefore, an important performance figure
for a token-passing network is the token rotation time. This is the time required for
the token to be circulated to each of the masters (token holders) in the logical ring.
In order to illustrate the operation of a multiple-master network, consider the
example shown in Figure 7-28.
The network in Figure 7-28 has four S7-200 CPUs, and each has its own TD 200.
Two CPU 224 modules gather data from all the other CPUs.
Note
The example provided here is based on a network such as the one shown in
Figure 7-28. The configuration includes TD 200 units. The CPU 224 modules are
using the NETR and NETW instructions. The formulas for token hold time and
token rotation time shown in Figure 7-29 are also based on such a configuration.
COM PROFIBUS provides an analyzer to determine network performance.
CPU 222
Station 2
CPU 222
Station 4
CPU 224
Station 6
CPU 224
Station 8
TD 200
Station 9
Figure 7-28
7-42
TD 200
Station 7
TD 200
Station 5
TD 200
Station 3
Example of a Token-Passing Network
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Setting Up Communications Hardware and Network Communications
In this configuration, the TD 200 (station 3) communicates with the CPU 222
(station 2), TD 200 (station 5) communicates with CPU 222 (station 4), and so on.
Also, CPU 224 (station 6) is sending messages to stations 2, 4, and 8, and
CPU 224 (station 8) is sending messages to stations 2, 4, and 6. In this network,
there are six master stations (the four TD 200 units and the two CPU 224 modules)
and two slave stations (the two CPU 222 modules).
Sending Messages
In order for a master to send a message, it must hold the token. For example:
When station 3 has the token, it initiates a request message to station 2 and then it
passes the token to station 5. Station 5 then initiates a request message to
station 4 and then passes the token to station 6. Station 6 then initiates a message
to station 2, 4, or 8, and passes the token to station 7. This process of initiating a
message and passing the token continues around the logical ring from station 3 to
station 5, station 6, station 7, station 8, station 9, and finally back to station 3. The
token must rotate completely around the logical ring in order for a master to be
able to send a request for information. For a logical ring of six stations, sending
one request message per token hold to read or write one double-word value (four
bytes of data), the token rotation time is approximately 900 ms at 9600 baud.
Increasing the number of bytes of data accessed per message or increasing the
number of stations increases the token rotation time.
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
7-43
Setting Up Communications Hardware and Network Communications
Token Rotation Time
The token rotation time is determined by how long each station holds the token.
You can determine the token rotation time for your S7-200 multiple-master network
by adding the times that each master holds the token. If the PPI master mode has
been enabled (under the PPI protocol on your network), you can send messages
to other CPUs by using the Network Read (NETR) and Network Write (NETW)
instructions with the CPU. See the description of these instructions in Section 9.16,
SIMATIC Communications Instructions in Chapter 9. If you send messages using
these instructions, you can use the formula shown in Figure 7-29 to calculate the
approximate token rotation time when the following assumptions are true:
Each station sends one request per token hold.
The request is either a read or write request for consecutive data locations.
There is no conflict for use of the one communication buffer in the CPU.
There is no CPU that has a scan time longer than about 10 ms.
Token hold time (Thold) = (128 overhead + n data char) < 11 bits/char < 1/baud rate
Token rotation time (Trot) = Thold of master 1 + Thold of master 2 + . . . + Thold of master m
where n is the number of data characters (bytes)
and m is the number of masters
Solving for the token rotation time using the example shown above, where each of the six
masters has the same token hold time, yields:
T (token hold time)
= (128 + 4 char) < 11 bits/char < 1/9600 bit times/s
= 151.25 ms/master
T (token rotation time) = 151.25 ms/master < 6 masters
= 907.5 ms
(One “bit time” equals the duration of one signaling period.)
Figure 7-29
7-44
Formulas for Token Hold Time and Token Rotation Time, Using NETR and
NETW
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Setting Up Communications Hardware and Network Communications
Token Rotation Comparison
Table 7-11, Table 7-12, and Table 7-13 show comparisons of the token rotation
time versus the number of stations and amount of data at 9.6 kbaud, 19.2 kbaud,
and 187.5 kbaud, respectively. The times are figured for a case where you use the
Network Read (NETR) and Network Write (NETW) instructions with the CPU or
other master devices.
Table 7-11 Token Rotation Time versus Number of Stations and Amount of Data at 9.6 kbaud
Bytes Transferred
per Station at
9.6 kbaud
Number of Stations, with Time in Seconds
2
stations
3
stations
4
stations
5
stations
6
stations
7
stations
8
stations
9
stations
10
stations
1
0.30
0.44
0.59
0.74
0.89
1.03
1.18
1.33
1.48
2
0.30
0.45
0.60
0.74
0.89
1.04
1.19
1.34
1.49
3
0.30
0.45
0.60
0.75
0.90
1.05
1.20
1.35
1.50
4
0.30
0.45
0.61
0.76
0.91
1.06
1.21
1.36
1.51
5
0.30
0.46
0.61
0.76
0.91
1.07
1.22
1.37
1.52
6
0.31
0.46
0.61
0.77
0.92
1.07
1.23
1.38
1.54
7
0.31
0.46
0.62
0.77
0.93
1.08
1.24
1.39
1.55
8
0.31
0.47
0.62
0.78
0.94
1.09
1.25
1.40
1.56
9
0.31
0.47
0.63
0.78
0.94
1.10
1.26
1.41
1.57
10
0.32
0.47
0.63
0.79
0.95
1.11
1.27
1.42
1.58
11
0.32
0.48
0.64
0.80
0.96
1.11
1.27
1.43
1.59
12
0.32
0.48
0.64
0.80
0.96
1.12
1.28
1.44
1.60
13
0.32
0.48
0.65
0.81
0.97
1.13
1.29
1.45
1.62
14
0.33
0.49
0.65
0.81
0.98
1.14
1.30
1.46
1.63
15
0.33
0.49
0.66
0.82
0.98
1.15
1.31
1.47
1.64
16
0.33
0.50
0.66
0.83
0.99
1.16
1.32
1.49
1.65
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
7-45
Setting Up Communications Hardware and Network Communications
Table 7-12 Token Rotation Time versus Number of Stations and Amount of Data at 19.2 kbaud
Bytes Transferred
per Station at
19.2 kbaud
Number of Stations, with Time in Seconds
2
stations
3
stations
4
stations
5
stations
6
stations
7
stations
8
stations
9
stations
10
stations
1
0.15
0.22
0.30
0.37
0.44
0.52
0.59
0.67
0.74
2
0.15
0.22
0.30
0.37
0.45
0.52
0.60
0.67
0.74
3
0.15
0.23
0.30
0.38
0.45
0.53
0.60
0.68
0.75
4
0.15
0.23
0.30
0.38
0.45
0.53
0.61
0.68
0.76
5
0.15
0.23
0.30
0.38
0.46
0.53
0.61
0.69
0.76
6
0.15
0.23
0.31
0.38
0.46
0.54
0.61
0.69
0.77
7
0.15
0.23
0.31
0.39
0.46
0.54
0.62
0.70
0.77
8
0.16
0.23
0.31
0.39
0.47
0.55
0.62
0.70
0.78
9
0.16
0.24
0.31
0.39
0.47
0.55
0.63
0.71
0.78
10
0.16
0.24
0.32
0.40
0.47
0.55
0.63
0.71
0.79
11
0.16
0.24
0.32
0.40
0.48
0.56
0.64
0.72
0.80
12
0.16
0.24
0.32
0.40
0.48
0.56
0.64
0.72
0.80
13
0.16
0.24
0.32
0.40
0.48
0.57
0.65
0.73
0.81
14
0.16
0.24
0.33
0.41
0.49
0.57
0.65
0.73
0.81
15
0.16
0.25
0.33
0.41
0.49
0.57
0.66
0.74
0.82
16
0.17
0.25
0.33
0.41
0.50
0.58
0.66
0.74
0.83
Table 7-13 Token Rotation Time versus Number of Stations and Amount of Data at 187.5 kbytes
Bytes Transferred
per Station at
187.5 kbaud
7-46
Number of Stations, with Time in Milliseconds
2
stations
3
stations
4
stations
5
stations
6
stations
7
stations
8
stations
9
stations
10
stations
1
8.68
13.02
17.37
21.71
26.05
30.39
34.73
39.07
43.41
2
8.80
13.20
17.60
22.00
26.40
30.80
35.20
39.60
44.00
3
8.92
13.38
17.83
22.29
26.75
31.21
35.67
40.13
44.59
4
9.03
13.55
18.07
22.59
27.10
31.62
36.14
40.66
45.17
5
9.15
13.73
18.30
22.88
27.46
32.03
36.61
41.18
45.76
6
9.27
13.90
18.54
23.17
27.81
32.44
37.08
41.71
46.35
7
9.39
14.08
18.77
23.47
28.16
32.85
37.55
42.24
46.93
8
9.50
14.26
19.01
23.76
28.51
33.26
38.02
42.77
47.52
9
9.62
14.43
19.24
24.05
28.86
33.67
38.49
43.30
48.11
10
9.74
14.61
19.48
24.35
29.22
34.09
38.95
43.82
48.69
11
9.86
14.78
19.71
24.64
29.57
34.50
39.42
44.35
49.28
12
9.97
14.96
19.95
24.93
29.92
34.91
39.89
44.88
49.87
13
10.09
15.14
20.18
25.23
30.27
35.32
40.36
45.41
50.45
14
10.21
15.31
20.42
25.52
30.62
35.73
40.83
45.84
51.04
15
10.33
15.49
20.65
25.81
30.98
36.14
41.30
46.46
51.63
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Conventions for S7-200 Instructions
8
The following conventions are used in this chapter to illustrate the equivalent
ladder logic, function block diagram, and statement list instructions and the CPUs
in which the instructions are available.
Chapter Overview
Section
Description
Page
8.1
Concepts and Conventions for STEP 7-Micro/WIN 32
Programming
8-2
8.2
Valid Ranges for the S7-200 CPUs
8-7
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
8-1
Conventions for S7-200 Instructions
8.1
Concepts and Conventions For STEP 7-Micro/WIN 32
Programming
The following diagram shows the Micro/WIN 32 instruction format as used
throughout this chapter. A description of the components of the instruction format
follows the diagram.
Add Integer and Subtract Integer
L
A
D
ADD_I
ENO
EN
F
B
D
IN1 OUT
OUT
The Add Integer and Subtract Integer instructions add
or subtract two 16-bit integers and produce a 16-bit result
(OUT).
In LAD and FBD:
IN1 + IN2 = OUT
IN1 - IN2 = OUT
In STL:
IN1 + OUT = OUT
OUT - IN1 = OUT
IN2
SUB_I
EN
ENO
IN1 OUT
OUT
IN2
S
T
L
Inputs/Outputs
Error conditions that set ENO = 0: SM1.1 (overflow),
SM4.3 (run-time), 0006 (indirect address)
These instructions affect the following Special Memory
bits: SM1.0 (zero); SM1.1 (overflow); SM1.2 (negative)
+I
IN1, OUT
-I
IN1, OUT
3
3
3
221
222
224
Operands
Data Types
IN1, IN2
VW, IW, QW, MW, SW, SMW, LW, AIW, T, C, AC, Constant, *VD,
*AC, *LD
INT
OUT
VW, IW, QW, MW, SW, SMW, LW, T, C, AC, *VD, *AC, *LD
INT
8-2
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Conventions for S7-200 Instructions
Title of the Instruction or Instruction Group: In this example Add Integer and
Subtract Integer is the title.
Figure Showing the Micro/WIN 32 Instruction: The figure below the instruction
title contains a picture of the LAD instruction element, the FBD instruction element
and for SIMATIC instructions, the STL instruction mnemonics and operands. In
some cases, the picture of the LAD and FBD instructions are the same, and only
one box containing both the LAD and FBD picture is shown (this is the case in this
example). The SIMATIC STL instruction mnemonics and operands always appear
in a separate box.
In the example, the LAD/FBD pictures have three inputs (inputs are always on the
left side of the picture) and two outputs (outputs are always on the right side of the
picture). In LAD there are two basic types of inputs and outputs. The first type of
input/output is a power flow input or output.
In LAD, which is patterned after Relay Ladder Logic Electrical Drawings, there is a
left power rail that is energized. In LAD, contacts that are closed allow energy to
flow through them to the next element and contacts that are open block that
energy flow. Any LAD element that can be connected to the left or right power rail
or to a contact has a power flow input and/or output.
In SIMATIC FBD, which does not use the concept of left and right power rails, the
term “power flow” is used to express the analogous concept of control flow through
the FBD logic blocks. The logic “1” path through FBD elements is called power
flow.
In LAD a power flow input or output is always exclusively power flow and cannot be
assigned to an operand. In FBD the origin of a power flow input and the destination
of a power flow output can be assigned directly to an operand.
In addition to power flow many, but not all, instructions have one or more input and
output operands. The allowed parameters for the operand inputs and outputs are
provided in the Inputs/Outputs table beneath the LAD/FBD/STL figure.
CPU Type: The instruction figure shows the CPUs that support the instruction. In
this example, the instruction is supported by the CPU 221, CPU 222, and
CPU 224.
Instruction Description: The text to the right of the instruction figure on
page 8-2 describes the operation of the instruction(s). In some cases there is a
description of the operation of the instruction for each language and in other cases
there will be a single description that applies to all three programming languages.
Note that IEC terminology is slightly different from SIMATIC terminology. For
example, a SIMATIC Count Up (CTU) is called an instruction; an IEC CTU is called
a function block.
Error Conditions that Set ENO = 0: If the LAD/FBD instructions have an ENO
output, this section lists the error conditions that result in ENO being set to a zero.
SM Bits Affected: If the instruction affects SM bits as a normal part of executing
the instruction, the bits affected and how they are affected are listed in this section.
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
8-3
Conventions for S7-200 Instructions
Operand Table: Beneath the LAD/FBD/STL figure is a table that lists the allowed
operands for each of the inputs and outputs, along with the data types of each
operand. The memory ranges of the operands for each CPU are shown in
Table 8-3.
EN/ENO operands and data types are not shown in the instruction operand table
because the operands are the same for all LAD and FBD instructions. Table 8-1
lists these operands and data types for LAD and FBD. These operands apply to all
LAD and FBD instructions shown in this manual.
Table 8-1
EN/ENO Operands and Data Types for LAD and FBD
Language
Editor
LAD
FBD
Inputs/Outputs
Operands
Data Types
EN
Power Flow
BOOL
ENO
Power Flow
BOOL
EN
I, Q, M, S, SM, T, C, V, L, Power Flow
BOOL
ENO
I, Q, M, S, SM, T, C, V, L, Power Flow
BOOL
General Conventions of Programming
Network: In LAD the program is divided into segments called networks. A network
is an ordered arrangement of contacts, coils, and boxes that are all connected to
form a complete circuit between the left power rail and the right power rail (no short
circuits, no open circuits, and no reverse power flow conditions exist).
STEP 7-Micro/WIN 32 allows you to create comments for your LAD program on a
network by network basis.
FBD programming uses the network concept for segmenting and commenting your
program. STL programs do not use networks; however, you can use the
NETWORK keyword to segment your program. If you do this, your program can be
converted to either LAD or to FBD.
Execution Subsections: In LAD, FBD, or STL a program consists of at least one
mandatory section and other optional sections. The mandatory section is the Main
Program. Optional sections can include one or more subroutines and/or interrupt
routines. You can easily move between subsections of the program by selecting or
clicking on the subsection tabs displayed by STEP 7-Micro/WIN 32.
EN/ENO Definition: EN (Enable IN) is a Boolean input for boxes in LAD and
FBD. Power flow must be present at this input for the box instruction to be
executed. In STL the instructions do not have an EN input, but the top of stack
value must be a logic “1” for the corresponding STL instruction to be executed.
ENO (Enable Out) is a Boolean output for boxes in LAD and FBD. If the box has
power flow at the EN input and the box executes its function without error, then the
ENO output will pass power flow to the next element. If an error is detected in the
execution of the box, then power flow is terminated at the box that generated the
error.
8-4
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Conventions for S7-200 Instructions
In SIMATIC STL, there is no ENO output, but the STL instructions that correspond
to the LAD and FBD instructions with ENO outputs do set a special ENO bit. This
bit is accessible with the STL instruction AENO (AND ENO), and may be used to
generate the same effect as the ENO bit of a box.
Conditional/Unconditional Inputs: In LAD and FBD, a box or a coil that is
dependent upon power flow is shown without a connection to any element on the
left side. A coil or box that is independent of power flow is shown with a connection
directly to the left power rail. Both conditional and unconditional inputs are shown
in Figure 8-1.
LAD
JMP
Instruction that is dependent on power flow
NEXT
Instruction that is independent of power flow
FBD
JMP
NEXT
Figure 8-1
LAD Diagram of Conditional and Unconditional Inputs
Instructions without Outputs: Boxes that cannot cascade are drawn with no
Boolean outputs. These include subroutine calls, JMP, CRET, etc. There are also
ladder coils that can only be placed on the left power rail. These include LBL,
NEXT, SCR, SCRE, etc. These are shown in FBD as boxes and are distinguished
with unlabeled power inputs and no outputs.
Compare Instructions: SIMATIC FBD, IEC Ladder, and IEC FBD compare
instructions are shown as boxes although the operation is performed as a contact.
The compare instruction is executed regardless of the state of power flow. If power
flow is false, the output is false. If power flow is true, the output is set depending
upon the result of the compare.
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
8-5
Conventions for S7-200 Instructions
STEP 7-Micro/WIN 32 Conventions: In STEP 7-Micro/WIN 32, the following
conventions apply:
The ladder editor symbol “--->” is an optional power flow connection.
The ladder editor symbol “--->>” is a required power flow connection.
Double quotes around a symbol name “var1” indicate that the symbol is of
global scope.
The pound character in front of a symbol name #var1 indicates that the symbol
is of local scope.
The operand symbol “?” or “????” indicates a value is required.
The symbols “<<” or “>>” indicate that either a value or a power flow can be
used.
The >| indicates that the output is a ENO output.
The % symbol indicates a direct address in IEC modes.
Negation Bubbles in FBD: The logical NOT condition of the state of the operand
or power flow driving the input is shown by the small circle on the input to an FBD
instruction. In Figure 8-2, Q0.0 is equal to the NOT of I0.0 AND I0.1.
AND
I0.0
Q0.0
I0.1
Figure 8-2
FBD Diagram of the Logical NOT Condition
Immediate Indicators in FBD: The immediate condition of of a Boolean operand
is shown by the vertical line on the input to an FBD instruction (Figure 8-3).
AND
I0.0
Q0.0
I0.1
Figure 8-3
FBD Diagram of the Immediate Condition
Tab Key in FBD: The tab key moves the cursor from one input to another. The
input currently selected becomes red.
8-6
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Conventions for S7-200 Instructions
8.2
Valid Ranges for the S7-200 CPUs
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Table 8-2
Summary of S7-200 CPU Memory Ranges and Features
Description
CPU 221
CPU 222
CPU 224
User program size
2 Kwords
2 Kwords
4 Kwords
User data size
1 Kwords
1 Kwords
2.5 Kwords
Process-image input register
I0.0 to I15.7
I0.0 to I15.7
I0.0 to I15.7
Process-image output register
Q0.0 to Q15.7
Q0.0 to Q15.7
Q0.0 to Q15.7
Analog inputs (read only)
--
AIW0 to AIW30
AIW0 to AIW30
Analog outputs (write only)
--
AQW0 to AQW30
AQW0 to AQW30
Variable memory (V)1
VB0.0 to VB2047.7
VB0.0 to VB2047.7
VB0.0 to VB5119.7
Local memory (L)2
LB0.0 to LB63.7
LB0.0 to LB63.7
LB0.0 to LB63.7
Bit memory (M)
M0.0 to M31.7
M0.0 to M31.7
M0.0 to M31.7
Special Memory (SM)
SM0.0 to SM179.7
SM0.0 to SM179.7
SM0.0 to SM179.7
SM0.0 to SM29.7
SM0.0 to SM29.7
SM0.0 to SM29.7
256 (T0 to T255)
256 (T0 to T255)
256 (T0 to T255)
T0, T64
T0, T64
T0, T64
T1 to T4, T65 to T68
T1 to T4, T65 to T68
T1 to T4, T65 to T68
Retentiveon-delay 100 ms
T5 to T31, T69 to T95
T5 to T31, T69 to T95
T5 to T31, T69 to T95
On/Off delay
T32, T96
T32, T96
T32, T96
Read only
Timers
Retentive on-delay
1 ms
Retentive on-delay
10 ms
1 ms
On/Off delay
10 ms
T33 to T36, T97 to T100
T33 to T36, T97 to T100
T33 to T36, T97 to T100
On/Off delay
100 ms
T37 to T63, T101 to T255
T37 to T63, T101 to T255
T37 to T63, T101 to T255
Counters
C0 to C255
C0 to C255
C0 to C255
High-speed counter
HC0, HC3, HC4, HC5
HC0, HC3, HC4, HC5
HC0 to HC5
Sequential control relays (S)
S0.0 to S31.7
S0.0 to S31.7
S0.0 to S31.7
Accumulator registers
AC0 to AC3
AC0 to AC3
AC0 to AC3
Jumps/Labels
0 to 255
0 to 255
0 to 255
Call/Subroutine
0 to 63
0 to 63
0 to 63
Interrupt routines
0 to 127
0 to 127
0 to 127
PID loops
0 to 7
0 to 7
0 to 7
Port
Port 0
Port 0
Port 0
1 All V memory can be saved to permanent memory.
2 LB60 to LB63 are reserved by STEP 7-Micro/WIN 32, version 3.0 or later.
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
8-7
Conventions for S7-200 Instructions
Table 8-3
S7-200 CPU Operand Ranges
Access Method
Bit access (byte.bit)
Byte access
Word access
Double word access
CPU 221
CPU 224
V
0.0 to 2047.7
V
0.0 to 2047.7
V
0.0 to 5119.7
I
0.0 to 15.7
I
0.0 to 15.7
I
0.0 to 15.7
Q
0.0 to 15.7
Q
0.0 to 15.7
Q
0.0 to 15.7
M
0.0 to 31.7
M
0.0 to 31.7
M
0.0 to 31.7
SM
0.0 to 179.7
SM
0.0 to 179.7
SM
0.0 to 179.7
S
0.0 to 31.7
S
0.0 to 31.7
S
0.0 to 31.7
T
0 to 255
T
0 to 255
T
0 to 255
C
0 to 255
C
0 to 255
C
0 to 255
L
0.0 to 63.7
L
0.0 to 63.7
L
0.0 to 63.7
VB
0 to 2047
VB
0 to 2047
VB
0 to 5119
IB
0 to 15
IB
0 to 15
IB
0 to 15
QB
0 to 15
QB
0 to 15
QB
0 to 15
MB
0 to 31
MB
0 to 31
MB
0 to 31
SMB
0 to 179
SMB
0 to 179
SMB
0 to 179
SB
0 to 31
SB
0 to 31
SB
0 to 31
LB
0 to 63
LB
0 to 63
LB
0 to 63
AC
0 to 3
AC
0 to 3
AC
0 to 3
Constant
Constant
Constant
VW
0 to 2046
VW
0 to 2046
VW
0 to 5118
IW
0 to 14
IW
0 to 14
IW
0 to14
QW
0 to 14
QW
0 to 14
QW
0 to 14
MW
0 to 30
MW
0 to 30
MW
0 to 30
SMW 0 to 178
SMW 0 to 178
SMW 0 to 178
SW
0 to 30
SW
0 to 30
SW
0 to 30
T
0 to 255
T
0 to 255
T
0 to 255
C
0 to 255
C
0 to 255
C
0 to 255
LW
0 to 62
LW
0 to 62
LW
0 to 62
AC
0 to 3
AC
0 to 3
AC
0 to 3
AIW
0 to 30
AIW
0 to 30
AIW
0 to 30
AQW 0 to 30
AQW 0 to 30
AQW 0 to 30
Constant
Constant
Constant
VD
0 to 2044
VD
0 to 2044
VD
0 to 5116
ID
0 to 12
ID
0 to 12
ID
0 to 12
QD
0 to 12
QD
0 to 12
QD
0 to 12
MD
0 to 28
MD
0 to 28
MD
0 to 28
SMD 0 to 176
SMD 0 to 176
SMD 0 to 176
SD
0 to 28
SD
0 to 28
SD
0 to 28
LD
0 to 60
LD
0 to 60
LD
0 to 60
AC
0 to 3
AC
0 to 3
AC
0 to 3
HC
0, 3, 4, 5
HC
0, 3, 4, 5
HC
0 to 5
Constant
8-8
CPU 222
Constant
Constant
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9
SIMATIC Instructions
This chapter describes the SIMATIC instruction set for the S7-200.
Chapter Overview
Section
Description
Page
9.1
SIMATIC Bit Logic Instructions
9-2
9.2
SIMATIC Compare Instructions
9-10
9.3
SIMATIC Timer Instructions
9-15
9.4
SIMATIC Counter Instructions
9-23
9.5
SIMATIC High-Speed Counter Instructions
9-27
9.6
SIMATIC Pulse Output Instructions
9-49
9.7
SIMATIC Clock Instructions
9-70
9.8
SIMATIC Integer Math Instructions
9-72
9.9
SIMATIC Real Math Instructions
9-81
9.10
SIMATIC Move Instructions
9-99
9.11
SIMATIC Table Instructions
9-104
9.12
SIMATIC Logical Operations Instructions
9-110
9.13
SIMATIC Shift and Rotate Instructions
9-116
9.14
SIMATIC Conversion Instructions
9-126
9.15
SIMATIC Program Control Instructions
9-141
9.16
SIMATIC Interrupt and Communications Instructions
9-165
9.17
SIMATIC Logic Stack Instructions
9-192
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-1
SIMATIC Instructions
9.1
SIMATIC Bit Logic Instructions
Standard Contacts
L
A
D
bit
bit
The Normally Open contact is closed (on) when the bit
is equal to 1.
/
F
B
D
These instructions obtain the referenced value from the
memory or process-image register if the data type is I or
Q. You can use a maximum of seven inputs to both the
AND and the OR boxes.
AND
The Normally Closed contact is closed (on) when the bit
is equal to 0.
In LAD, normally open and normally closed instructions
are represented by contacts.
OR
S
T
L
LD
A
O
LDN
AN
ON
bit
bit
bit
bit
bit
bit
3
3
3
221
222
224
In FBD, normally open instructions are represented by
AND/OR boxes. These instructions can be used to
manipulate Boolean signals in the same manner as
ladder contacts. Normally closed instructions are also
represented by boxes. A normally closed instruction is
constructed by placing the negation symbol on the stem
of the input signal.
In STL, the Normally Open contact is represented by the
Load, And, and Or instructions. These instructions
Load, AND, or OR the bit value of the address bit to the
top of the stack.
In STL, the Normally closed contact is represented by
the Load Not, And Not, and Or Not instructions. These
instructions Load, AND, or OR the logical Not of the bit
value of the address bit to the top of the stack.
Inputs/Outputs
Operands
Data Types
bit (LAD, STL)
I, Q, M, SM, T, C, V, S, L
BOOL
Input (FBD)
I, Q, M, SM, T, C, V, S, L, Power Flow
BOOL
Output (FBD)
I, Q, M, SM, T, C, V, S, L, Power Flow
BOOL
9-2
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Immediate Contacts
L
A
D
bit
I
The immediate instruction obtains the physical input
value when the instruction is executed, but the
process-image register is not updated.
bit
/I
The Normally Open Immediate contact is closed (on)
when the physical input point (bit) is 1.
The Normally Closed Immediate contact is closed (on)
when the physical input point (bit) is 0.
F
B
D
In LAD, normally open and normally closed immediate
instructions are represented by contacts.
S
T
L
LDI
AI
OI
bit
bit
bit
LDNI
ANI
ONI
bit
bit
bit
3
3
3
221
222
224
In FBD, normally open immediate instructions are
represented by the immediate indicator in front of the
operand tic. The immediate indicator may not be present
when power flow is used. The instruction can be used to
manipulate physical signals in the same manner as
ladder contacts.
In FBD, normally closed immediate instructions are also
represented by the immediate indicator and negation
symbol in front of the operand tic. The immediate
indicator cannot be present when power flow is used.
The normally closed instruction is constructed by placing
the negation symbol on the stem of the input signal.
In STL, the Normally Open Immediate contact is represented by the Load Immediate, And
Immediate, and Or Immediate instructions. These instructions Load, AND, or OR the physical
input value to the top of the stack immediately.
In STL, the Normally Closed Immediate contact is represented by the Load Not Immediate,
And Not Immediate, and Or Not Immediate instructions. These instructions immediately
Load, AND, or OR the logical Not of the value of the physical input point to the top of the stack.
Inputs/Outputs
Operands
Data Types
bit (LAD, STL)
I
BOOL
Input (FBD)
I
BOOL
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-3
SIMATIC Instructions
Not
L
A
D
NOT
F
B
D
In LAD, the NOT instruction is shown as a contact.
L
A
D
S
T
L
The NOT contact changes the state of power flow. When
power flow reaches the Not contact, it stops. When
power flow does not reach the Not contact, it supplies
power flow.
In FBD, the NOT instruction uses the graphical negation
symbol with Boolean box inputs.
In STL, the NOT instruction changes the value on the top
of the stack from 0 to 1, or from 1 to 0.
NOT
3
3
3
221
222
224
Operands:
none
Data Types: None
Positive, Negative Transition
L
A
D
The Positive Transition contact allows power to flow for
one scan for each off-to-on transition.
P
The Negative Transition contact allows power to flow
for one scan for each on-to-off transition.
N
F
B
D
In LAD, the Positive and Negative Transition instructions
are represented by contacts.
P
IN
OUT
N
IN
S
T
L
Inputs/Outputs
OUT
In FBD, the instructions are represented by the P and N
boxes.
In STL, the Positive Transition contact is represented by
the Edge Up instruction. Upon detection of a 0-to-1
transition in the value on the top of the stack, the top of
the stack value is set to 1; otherwise, it is set to 0.
In STL, the Negative Transition contact is represented by
the Edge Down instruction. Upon detection of a 1-to-0
transition in the value on the top of the stack, the top of
the stack value is set to 1; otherwise, it is set to 0.
EU
ED
3
3
3
221
222
224
Operands
Data Types
IN (FBD)
I, Q, M, SM, T, C, V, S, L, Power Flow
BOOL
OUT (FBD)
I, Q, M, SM, T, C, V, S, L, Power Flow
BOOL
9-4
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Contact Examples
LAD
Network 1
I0.0
I0.1
STL
NETWORK 1
LD
I0.0
A
I0.1
=
Q0.0
Q0.0
Network 2
I0.0
NETWORK 2
LD
I0.0
NOT
=
Q0.1
Q0.1
NOT
Network 3
I0.1
NETWORK 3
LD
I0.1
ED
=
Q0.2
Q0.2
N
FBD
Network 1
AND
I0.0
Q0.0
I0.1
Network 2
Q0.1
=
I0.0
Network 3
N
I0.1
IN
OUT
Q0.2
Timing Diagram
I0.0
I0.1
Q0.0
Q0.1
On for one scan
Q0.2
Figure 9-1
Examples of Boolean Contact Instructions for SIMATIC LAD, STL, and FBD
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-5
SIMATIC Instructions
Output
L
A
D
bit
When the Output instruction is executed, the output bit
in the process image register is turned on.
In LAD and FBD, when the output instruction is
executed, the specified bit is set to equal to power flow.
F
B
D
bit
=
S
T
L
In STL, the output instruction copies the top of the stack
to the specified bit.
= bit
3
3
3
221
222
224
Inputs/Outputs
Operands
Data Types
bit
I, Q, M, SM, T, C, V, S, L
BOOL
Input (LAD)
Power Flow
BOOL
Input (FBD)
I, Q, M, SM, T, C, V, S, L, Power Flow
BOOL
Output Immediate
L
A
D
bit
I
bit
=I
F
B
D
S
T
L
=I bit
3
3
3
221
222
224
Inputs/Outputs
When the Output Immediate instruction is executed, the
physical output point (bit or OUT) is set equal to power
flow.
The “I” indicates an immediate reference; the new value
is written to both the physical output and the
corresponding process-image register location when the
instruction is executed. This differs from the
non-immediate references, which write the new value to
the process-image register only.
In STL, the output immediate instruction copies the top of
the stack to the specified physical output point (bit)
immediately.
Operands
Data Types
bit
Q
BOOL
Input (LAD)
Power Flow
BOOL
Input (FBD)
I, Q, M, SM, T, C, V, S, L, Power Flow
BOOL
9-6
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Set, Reset (N Bits)
bit
S
N
bit
R
N
L
A
D
F
B
D
bit
When the Set and Reset instructions are executed, the
specified number of points (N) starting at the value
specified by the bit or OUT parameter are set (turned on)
or reset (turned off).
The range of points that can be set or reset is 1 to 255.
When using the Reset instruction, if the bit is specified to
be either a T- or C-bit, then either the timer or counter bit
is reset and the timer/counter current value is cleared.
S
Error conditions that set ENO = 0: SM4.3 (run-time),
0006 (indirect address), 0091 (operand out of range)
EN
N
bit
R
EN
N
S
T
L
S
bit, N
R
bit, N
3
3
3
221
222
224
Inputs/Outputs
Operands
Data Types
bit
I, Q, M, SM, T, C, V, S, L
BOOL
N
VB, IB, QB, MB, SMB, SB, LB, AC, Constant,*VD, *AC, *LD
BYTE
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-7
SIMATIC Instructions
Set Immediate, Reset Immediate (N Bits)
L
A
D
bit
SI
N
bit
RI
N
bit
F
B
D
SI
EN
N
bit
RI
EN
The range of points that can be set or reset is 1 to 128.
The “I” indicates an immediate reference; the new value
is written to both the physical output point and the
corresponding process-image register location when the
instruction is executed. This differs from the
non-immediate references, which write the new value to
the process-image register only.
Error conditions that set ENO = 0:
N
SM4.3 (run-time), 0006 (indirect address), 0091 (operand
out of range)
S
T
L
SI
bit, N
RI
bit, N
3
3
3
221
222
224
Inputs/Outputs
bit
When the Set Immediate and Reset Immediate
instructions are executed, the specified number of
physical output points (N) starting at the bit or OUT are
immediately set (turned on) or immediately reset (turned
off).
Operands
Data Types
Q
N
BOOL
VB, IB, QB, MB, SMB, SB, LB, AC, Constant,*VD, *AC, *LD
BYTE
No Operation
L
A
D
N
NOP
The No Operation instruction has no effect on the user
program execution. The operand N is a number from 0 to
255.
Operands:
S
T
L
9-8
NOP
N:
Constant (0 to 255)
Data Types: BYTE
N
3
3
3
221
222
224
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Output Examples
LAD
Network 1
I0.0
STL
NETWORK 1
LD
I0.0
=
Q0.0
S
Q0.1, 1
R
Q0.2, 2
Q0.0
Q0.1
S
1
Q0.2
R
2
FBD
Network 1
Q0.0
=
AND
I0.0
SM0.0
Q0.1
S
EN
1
N
Q0.2
R
EN
2
N
Timing Diagram
I0.0
Q0.0
Q0.1
Q0.2
Q0.3
Figure 9-2
Examples of Output Instructions for SIMATIC LAD, STL, and FBD
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-9
SIMATIC Instructions
9.2
SIMATIC Compare Instructions
Compare Byte
L
A
D
IN1
==B
IN2
The Compare Byte instruction is used to compare two
values: IN1 to IN2. Comparisons include: IN1 = IN2,
IN1 >= IN2, IN1 <= IN2, IN1 > IN2, IN1 < IN2, or
IN1 <> IN2.
Byte comparisons are unsigned.
F
B
D
==B
In LAD, the contact is on when the comparison is true.
In FBD, the output is on when the comparison is true.
In STL, the instructions Load, AND, or OR, a 1 with the
top of stack when the comparison is true.
S
T
L
LDB=
IN1, IN2
AB=
IN1, IN2
OB=
IN1, IN2
LDB<> IN1, IN2
AB<>
IN1, IN2
OB<>
IN1, IN2
LDB<
IN1, IN2
AB<
IN1, IN2
OB<
IN1, IN2
LDB<= IN1, IN2
AB<=
IN1, IN2
OB<=
IN1, IN2
LDB>
IN1, IN2
AB>
IN1, IN2
OB>
IN1, IN2
LDB>=
AB>=
OB>=
Inputs/Outputs
IN1, IN2
IN1, IN2
IN1, IN2
3
3
3
221
222
224
Operands
Data Types
Inputs
IB, QB, MB, SMB, VB, SB, LB, AC, Constant, *VD, *AC,*LD
BYTE
Outputs (FBD)
I, Q, M, SM, T, C, V, S, L, Power Flow
BOOL
9-10
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Compare Integer
L
A
D
IN1
==I
IN2
The Compare Integer instruction is used to compare two
values: IN1 to IN2. Comparisons include: IN1 = IN2,
IN1 >= IN2, IN1 <= IN2, IN1 > IN2, IN1 < IN2, or
IN1 <> IN2.
Integer comparisons are signed (16#7FFF > 16#8000).
F
B
D
==I
In LAD, the contact is on when the comparison is true.
In FBD, the output is on when the comparison is true.
In STL, the instructions Load, AND, or OR a 1 with the
top of stack when the comparison is true.
S
T
L
LDW=
AW=
OW=
LDW<>
AW<>
OW<>
LDW<
AW<
OW<
LDW<=
AW<=
OW<=
LDW>
AW>
OW>
IN1, IN2
IN1, IN2
IN1, IN2
IN1, IN2
IN1, IN2
IN1, IN2
IN1, IN2
IN1, IN2
IN1, IN2
IN1, IN2
IN1, IN2
IN1, IN2
IN1, IN2
IN1, IN2
IN1, IN2
LDW>= IN1, IN2
AW>=
IN1, IN2
OW>= IN1, IN2
3
3
3
221
222
224
Inputs/Outputs
Operands
Data Types
Inputs
IW, QW, MW, SW, SMW, T, C, VW, LW, AIW, AC, Constant, *VD,
*AC,*LD
INT
Outputs (FBD)
I, Q, M, SM, T, C, V, S, L, Power Flow
BOOL
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-11
SIMATIC Instructions
Compare Double Word
L
A
D
IN1
==D
IN2
The Compare Double Word instruction is used to
compare two values: IN1 to IN2. Comparisons include:
IN1 = IN2, IN1 >= IN2, IN1 <= IN2, IN1 > IN2,
IN1 < IN2, or IN1 <> IN2.
Double word comparisons are signed
(16#7FFFFFFF > 16#80000000).
F
B
D
==D
In LAD, the contact is on when the comparison is true.
In FBD, the output is on when the comparison is true.
In STL, the instructions Load, AND, or OR a 1 with the
top of stack when the comparison is true.
S
T
L
LDD=
AD=
OD=
LDD<>
AD<>
OD<>
LDD<
AD<
OD<
LDD<=
AD<=
OD<=
LDD>
AD>
OD>
IN1, IN2
IN1, IN2
IN1, IN2
IN1, IN2
IN1, IN2
IN1, IN2
IN1, IN2
IN1, IN2
IN1, IN2
IN1, IN2
IN1, IN2
IN1, IN2
IN1, IN2
IN1, IN2
IN1, IN2
LDD>=
AD>=
OD>=
IN1, IN2
IN1, IN2
IN1, IN2
3
3
3
221
222
224
Inputs/Outputs
Operands
Data Types
Inputs
ID, QD, MD, SD, SMD, VD, LD, HC, AC, Constant, *VD, *AC, *LD
DINT
Outputs (FBD)
I, Q, M, SM, T, C, V, S, L, Power Flow
BOOL
9-12
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Compare Real
L
A
D
IN1
==R
IN2
Compare Real instruction is used to compare two
values: IN1 to IN2. Comparisons include: IN1 = IN2,
IN1 >= IN2, IN1 <= IN2, IN1 > IN2, IN1 < IN2, or
IN1 <> IN2.
Real comparisons are signed.
F
B
D
==R
In LAD, the contact is on when the comparison is true.
In FBD, the output is on when the comparison is true.
In STL, the instructions Load, AND, or OR a 1 with the
top of stack when the comparison is true.
S
T
L
LDR=
IN1, IN2
AR=
IN1, IN2
OR=
IN1, IN2
LDR<> IN1, IN2
AR<>
IN1, IN2
OR<>
IN1, IN2
LDR<
IN1, IN2
AR<
IN1, IN2
OR<
IN1, IN2
LDR<= IN1, IN2
AR<=
IN1, IN2
OR<=
IN1, IN2
LDR>
IN1, IN2
AR>
IN1, IN2
OR>
IN1, IN2
LDR>=
AR>=
OR>=
IN1, IN2
IN1, IN2
IN1, IN2
3
3
3
221
222
224
Inputs/Outputs
Operands
Data Types
Inputs
ID, QD, MD,SD, SMD, VD, LD, AC, Constant, *VD, *AC, *LD
REAL
Outputs (FBD)
I, Q, M, SM, T, C, V, S, L, Power Flow
BOOL
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-13
SIMATIC Instructions
Comparison Contact Examples
LAD
Network 4
VW4
>=I
VW8
STL
NETWORK 4
LDW>=
VW4, VW8
=
Q0.3
Q0.3
FBD
Network 4
>=I
VW4
Q0.3
VW8
Timing Diagram
VW4 >= VW8
VW4 < VW8
Q0.3
Figure 9-3
9-14
Examples of Comparison Contact Instructions for LAD and STL
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
9.3
SIMATIC Timer Instructions
On-Delay Timer, Retentive On-Delay Timer, Off-Delay Timer
L
A
D
Txxx
TON
IN
F
B
D
PT
Txxx
TONR
IN
PT
Txxx
TOF
IN
The On-Delay timer current value is cleared when the
enabling input is OFF, while the current value of the
Retentive On-Delay Timer is maintained when the input
is OFF. You can use the Retentive On-Delay Timer to
accumulate time for multiple periods of the input ON. A
Reset instruction (R) is used to clear the current value of
the Retentive On-Delay Timer.
Both the On-Delay Timer and the Retentive On-Delay
Timers continue counting after the Preset is reached, and
they stop counting at the maximum value of 32767.
PT
S
T
L
The On-Delay Timer and Retentive On-Delay Timer
instructions count time when the enabling input is ON.
When the current value (Txxx) is greater than or equal to
the preset time (PT), the timer bit is ON.
TON
Txxx, PT
TONR
Txxx, PT
TOF
Txxx, PT
3
3
3
221
222
224
The Off-Delay Timer is used to delay turning an output
OFF for a fixed period of time after the input turns OFF.
When the enabling input turns ON, the timer bit turns ON
immediately, and the current value is set to 0. When the
input turns OFF, the timer counts until the elapsed time
reaches the preset time. When the preset is reached, the
timer bit turns OFF and the current value stops counting.
If the input is OFF for a time shorter than the preset
value, the timer bit remains ON. The TOF instruction
must see an ON to OFF transition to begin counting.
If the TOF timer is inside an SCR region and the SCR
region is inactive, then the current value is set to 0, the
timer bit is turned OFF, and the current value does not
count.
Inputs/Outputs
Operands
Data Types
IN (LAD)
Power Flow
BOOL
IN (FBD)
I, Q, M, SM, T, C, V, S, L, Power Flow
BOOL
PT
VW, IW, QW, MW, SW, SMW, LW, AIW, T, C, AC, Constant, *VD,
*AC, *LD
INT
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-15
SIMATIC Instructions
TON, TONR, and TOF timers are available in three resolutions. The resolution is
determined by the timer number as shown in Table 9-1. Each count of the current
value is a multiple of the time base. For example, a count of 50 on a 10-ms timer
represents 500 ms.
Table 9-1
Timer Numbers and Resolutions
Timer Type
TONR
TON, TOF
Resolution in
milliseconds (ms)
Maximum Value
in seconds (s)
Timer Number
1 ms
32.767 s
T0, T64
10 ms
327.67 s
T1 to T4, T65 to T68
100 ms
3276.7 s
T5 to T31, T69 to T95
1 ms
32.767 s
T32, T96
10 ms
327.67 s
T33 to T36, T97 to T100
100 ms
3276.7 s
T37 to T63, T101 to T255
Note
You cannot share the same timer numbers for TOF and TON. For example, you
cannot have both a TON T32 and a TOF T32.
9-16
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Understanding the S7-200 Timer Instructions
You can use timers to implement time-based counting functions. The S7-200
instruction set provides three types of timers as shown below. Table 9-2 shows the
actions of the different timers.
On-Delay Timer (TON) for timing a single interval
Retentive On-Delay Timer (TONR) for accumulating a number of timed intervals
Off-Delay Timer (TOF) for extending time past a false condition (in other words,
such as cooling a motor after it is turned off)
Table 9-2
Timer
Type
Timer Actions
Current >= Preset
Enabling Input
ON
Enabling Input
OFF
Power Cycle/
First Scan
TON
Timer bit ON,
Current continues
counting to 32,767
Current value
counts time
Timer bit OFF,
Current value = 0
Timer bit OFF,
Current value = 0
TONR
Timer bit ON,
Current continues
counting to 32,767
Current value
counts time
Timer bit and
current value
maintain last state
Timer bit OFF,
Current value may
be maintained1
TOF
Timer bit OFF,
Current = Preset,
stops counting
Timer bit ON,
Current value = 0
Timer counts after
ON to OFF
transition
Timer bit OFF,
Current value = 0
1 The retentive timer current value can be selected for retention through a power cycle. See Section 5.3 for information
about memory retention for the S7-200 CPU.
Note
The Reset (R) instruction can be used to reset any timer. The TONR timer can
only be reset by the Reset instruction. The Reset instruction performs the following
operations:
Timer Bit = OFF
Timer Current = 0
After a reset, TOF timers require the enabling input to make the transition from ON
to OFF in order to restart.
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-17
SIMATIC Instructions
The actions of the timers at different resolutions are explained below.
1-Millisecond Resolution
The 1-ms timers count the number of 1-ms timer intervals that have elapsed since
the active 1-ms timer was enabled. The execution of the timer instruction starts the
timing; however, the 1-ms timers are updated (timer bit and timer current) every
millisecond asynchronous to the scan cycle. In other words, the timer bit and timer
current are updated multiple times throughout any scan that is greater than 1 ms.
The timer instruction is used to turn the timer on, reset the timer, or, in the case of
the TONR timer, to turn the timer off.
Since the timer can be started anywhere within a millisecond, the preset must be
set to one time interval greater than the minimum desired timer interval. For
example, to guarantee a timed interval of at least 56 ms using a 1-ms timer, the
preset time value should be set to 57.
10-Millisecond Resolution
The 10-ms timers count the number of 10-ms timer intervals that have elapsed
since the active 10-ms timer was enabled. The execution of the timer instruction
starts the timing, however the 10-ms timers are updated at the beginning of each
scan cycle (in other words, the timer current and timer bit remain constant
throughout the scan), by adding the accumulated number of 10-ms intervals (since
the beginning of the previous scan) to the current value for the active timer.
Since the timer can be started anywhere within a 10-ms interval, the preset must
be set to one time interval greater than the minimum desired timer interval. For
example, to guarantee a timed interval of at least 140 ms using a 10-ms timer, the
preset time value should be set to 15.
100-Millisecond Resolution
The 100-ms timers count the number of 100-ms timer intervals that have elapsed
since the active 100-ms timer was last updated. These timers are updated by
adding the accumulated number of 100-ms intervals (since the previous scan
cycle) to the timer’s current value when the timer instruction is executed.
The current value of a 100-ms timer is updated only if the timer instruction is
executed. Consequently, if a 100-ms timer is enabled but the timer instruction is
not executed each scan cycle, the current value for that timer is not updated and it
loses time. Likewise, if the same 100-ms timer instruction is executed multiple
times in a single scan cycle, the number of 100-ms intervals are added to the
timer’s current value multiple times, and it gains time. 100-ms timers should only
be used where the timer instruction is executed exactly once per scan cycle.
Since the timer can be started anywhere within a 100-ms interval, the preset must
be set to one time interval greater than the minimum desired timer interval. For
example, to guarantee a timed interval of at least 2100 ms using a 100-ms timer,
the preset time value should be set to 22.
9-18
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Updating the Timer Current Value
The effect of the various ways in which current time values are updated depends
upon how the timers are used. For example, consider the timer operation shown in
Figure 9-4.
In the case where the 1-ms timer is used, Q0.0 is turned on for one scan
whenever the timer’s current value is updated after the normally closed contact
T32 is executed and before the normally open contact T32 is executed.
In the case where the 10-ms timer is used, Q0.0 is never turned on, because
the timer bit T33 is turned on from the top of the scan to the point where the
timer box is executed. Once the timer box has been executed, the timer’s
current value and its T-bit is set to zero. When the normally open contact T33 is
executed, T33 is off and Q0.0 is turned off.
In the case where the 100-ms timer is used, Q0.0 is always turned on for one
scan whenever the timer’s current value reaches the preset value.
By using the normally closed contact Q0.0 instead of the timer bit as the enabling
input to the timer box, the output Q0.0 is guaranteed to be turned on for one scan
each time the timer reaches the preset value.
Wrong
T32
300
300
Wrong
Correct
Figure 9-4
Q0.0
Better
Q0.0
/
PT
T37
IN
3
Q0.0
PT
T33
Using a 100-ms Timer
T37
IN TON
3
T33
IN TON
30
Q0.0
T37
/
Q0.0
Q0.0
/
PT
T33
PT
Corrected
Using a 10-ms Timer
T33
IN TON
30
T32
TON
T32
Q0.0
T33
/
IN
/
PT
T32
T37
Q0.0
T32
IN TON
/
Corrected
Using a 1-ms Timer
T37
TON
PT
Q0.0
Example of Automatically Retriggered One Shot Timer
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-19
SIMATIC Instructions
On-Delay Timer Example
LAD
I2.0
IN
3
FBD
T33
TON
T33
TON
PT
I2.0
IN
3
PT
STL
LD
TON
I2.0
T33, 3
Timing Diagram
I2.0
Maximum
value = 32767
PT = 3
PT = 3
T33 (current)
T33 (bit)
Figure 9-5
9-20
Example of On-Delay Timer Instruction for LAD, FBD, and STL
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Retentive On-Delay Timer Example
LAD
I2.1
IN
10
FBD
T2
TONR
T2
TONR
PT
I2.1
IN
10
PT
STL
LD
TONR
I2.1
T2, 10
Timing Diagram
I2.1
Maximum
value = 32767
PT = 10
T2 (current)
T2 (bit)
Figure 9-6
Example of Retentive On-Delay Timer Instruction for LAD, FBD, and STL
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-21
SIMATIC Instructions
Off-Delay Timer Example
LAD
I0.0
IN
3
FBD
T33
TOF
I0.0
3
PT
T33
TOF
IN
PT
STL
LD
TOF
I0.0
T33, 3
Timing Diagram
I0.0
PT = 3
PT = 3
T33 (current)
T33 (bit)
Figure 9-7
9-22
Example of Off-Delay Timer Instruction for LAD, FBD, and STL
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
9.4
SIMATIC Counter Instructions
Count Up, Count Up/Down, Count Down
L
A
D
Cxxx
CU CTU
F
B
D
R
The Count Up instruction counts up to the maximum
value on the rising edges of the Count Up (CU) input.
When the current value (Cxxx) is greater than or equal to
the Preset Value (PV), the counter bit (Cxxx) turns on.
The counter is reset when the Reset (R) input turns on.
PV
Cxxx
CU CTUD
CD
R
PV
Cxxx
CD CTD
LD
PV
The Count Up/Down instruction counts up on rising
edges of the Count Up (CU) input. It counts down on the
rising edges of the Count Down (CD) input. When the
current value (Cxxx) is greater than or equal to the
Preset Value (PV), the counter bit (Cxxx) turns on. The
counter is reset when the Reset (R) input turns on.
The Count Down Counter counts down from the preset
value on the rising edges of the Count Down (CD) input .
When the current value is equal to zero, the counter bit
(Cxxx) turns on. The counter resets the counter bit
(Cxxx) and loads the current value with the preset value
(PV) when the load input (LD) turns on. The Down
Counter stops counting when it reaches zero.
Counter ranges:
S
T
L
CTU
Cxxx, PV
CTUD
Cxxx, PV
CTD
Cxxx, PV
3
3
3
221
222
224
Cxxx=C0 through C255
In STL, the CTU Reset input is the top of the stack value,
while the Count Up input is the value loaded in the
second stack location.
In STL, the CTUD Reset input is the top of the stack
value, the Count Down input is the value loaded in the
second stack location, and the Count Up input is the
value loaded in the third stack location.
In STL, the CTD Load input is the top of stack, and the
Count Down input is the value loaded in the second stack
location.
Inputs/Outputs
Operands
Data Types
CU, CD (FBD)
I, Q, M, SM, T, C, V, S, L, Power Flow
BOOL
R, LD (FBD)
I, Q, M, SM, T, C, V, S, L, Power Flow
BOOL
PV
VW, IW, QW, MW, SMW, LW, AIW, AC, T, C, Constant, *VD, *AC,
*LD, SW
INT
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-23
SIMATIC Instructions
Understanding the S7-200 Counter Instructions
The Up Counter (CTU) counts up from the current value of that counter each time
the count-up input makes the transition from off to on. The counter is reset when
the reset input turns on, or when the Reset instruction is executed. The counter
stops upon reaching the maximum value (32,767).
The Up/Down Counter (CTUD) counts up each time the count-up input makes the
transition from off to on, and counts down each time the count-down input makes
the transition from off to on. The counter is reset when the reset input turns on, or
when the Reset instruction is executed. Upon reaching maximum value (32,767),
the next rising edge at the count-up input causes the current count to wrap around
to the minimum value (-32,768). Likewise on reaching the minimum value
(-32,768), the next rising edge at the count-down input causes the current count to
wrap around to the maximum value (32,767).
The Up and Up/Down counters have a current value that maintains the current
count. They also have a preset value (PV) that is compared to the current value
whenever the counter instruction is executed. When the current value is greater
than or equal to the preset value, the counter bit (C-bit) turns on. Otherwise, the
C-bit turns off.
The Down counter counts down from the current value of that counter each time
the count down input makes the transition from off to on. The counter resets the
counter bit and loads the current value with the preset value when the load input
turns on. The counter stops upon reaching zero, and the counter bit (C-bit) turns
on.
When you reset a counter using the Reset instruction, the counter bit is reset and
the counter current value is set to zero. Use the counter number to reference both
the current value and the C-bit of that counter.
Note
Since there is one current value for each counter, do not assign the same number
to more than one counter. (Up Counters, Up/Down Counters, and Down counters
with the same number access the same current value.)
9-24
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Counter Examples
LAD
FBD
C50
I3.0
C50
CTD
CD
I3.0
CD
I1.0
LD
3
PV
CTD
I1.0
LD
PV
3
STL
LD
LD
CTD
I3.0
I1.0
C50, 3
//Count Down Input
//Load Input
Timing Diagram
I3.0
Down
I1.0
Load
3
3
2
C50
(current)
2
1
0
0
C50
(bit)
Figure 9-8
Example of CTD Counter Instruction for LAD, FBD, and STL
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-25
SIMATIC Instructions
LAD
I4.0
CU
FBD
C48
CTUD
I4.0
CU
I3.0
CD
I2.0
R
C48
CTUD
I3.0
CD
I2.0
R
4
4
PV
PV
STL
LD
LD
LD
CTUD
I4.0
I3.0
I2.0
C48, 4
//Count Up Input
//Count Down Input
//Reset Input
Timing Diagram
I4.0
Up
I3.0
Down
I2.0
Reset
5
4
3
5
4
4
3
2
C48
(current)
1
0
0
C48
(bit)
Figure 9-9
9-26
Example of CTUD Counter Instruction for LAD, FBD, and STL
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
9.5
SIMATIC High-Speed Counter Instructions
High-Speed Counter Definition, High-Speed Counter
L
A
D
HDEF
EN
ENO
HSC
MODE
EN
HSC
ENO
The High-Speed Counter Definition instruction assigns
a MODE to the referenced high-speed counter (HSC).
See Table 9-5.
The High-Speed Counter instruction, when executed,
configures and controls the operational mode of the
high-speed counter, based on the state of the HSC
special memory bits. The parameter N specifies the
high-speed counter number.
CPU 221 and CPU 222 do not support HSC1 and HSC2.
N
Only one HDEF box may be used per counter.
S
T
L
HDEF HSC, MODE
HSC
HDEF: Error conditions that set ENO = 0:
SM4.3 (run-time), 0003 (input point conflict), 0004 (illegal
instruction in interrupt), 000A (HSC redefinition)
N
3
3
3
221
222
224
HSC: Error conditions that set ENO = 0:
SM4.3 (run-time), 0001 (HSC before HDEF), 0005
(simultaneous HSC/PLS)
Inputs/Outputs
Operands
Data Types
HSC
Constant
BYTE
MODE
Constant
BYTE
N
Constant
WORD
Understanding the High-Speed Counter Instructions
High-speed counters count high-speed events that cannot be controlled at CPU
scan rates, and can be configured for up to twelve different modes of operation.
The counter modes are listed in Table 9-5. The maximum counting frequency of a
high-speed counter is dependent upon your CPU type. See Appendix A for more
information about your CPU.
Each counter has dedicated inputs for clocks, direction control, reset, and start,
where these functions are supported. For the two-phase counters, both clocks may
run at their maximum rates. In quadrature modes, an option is provided to select
one times (1x) or four times (4x) the maximum counting rates. All counters run at
maximum rates without interfering with one another.
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-27
SIMATIC Instructions
Using the High-Speed Counter
Typically, a high-speed counter is used as the drive for a drum timer, where a shaft
rotating at a constant speed is fitted with an incremental shaft encoder. The shaft
encoder provides a specified number of counts per revolution and a reset pulse
that occurs once per revolution. The clock(s) and the reset pulse from the shaft
encoder provide the inputs to the high-speed counter. The high-speed counter is
loaded with the first of several presets, and the desired outputs are activated for
the time period where the current count is less than the current preset. The counter
is set up to provide an interrupt when the current count is equal to preset and also
when reset occurs.
As each current-count-value-equals-preset-value interrupt event occurs, a new
preset is loaded and the next state for the outputs is set. When the reset interrupt
event occurs, the first preset and the first output states are set, and the cycle is
repeated.
Since the interrupts occur at a much lower rate than the counting rates of the
high-speed counters, precise control of high-speed operations can be implemented
with relatively minor impact to the overall scan cycle of the programmable logic
controller. The method of interrupt attachment allows each load of a new preset to
be performed in a separate interrupt routine for easy state control, making the
program very straightforward and easy to follow. Of course, all interrupt events can
be processed in a single interrupt routine. For more information about the interrupt
instructions, see Section 9.16.
Understanding the Detailed Timing for the High-Speed Counters
The following timing diagrams (Figure 9-10 through Figure 9-16) show how each
counter functions according to mode. The operation of the reset and start inputs is
shown in a separate timing diagram and applies to all modes that use reset and
start inputs. In the diagrams for the reset and start inputs, both reset and start are
shown with the active state programmed to a high level.
Reset interrupt generated
1
Reset (Active High) 0
+2,147,483,647
Counter Current Value
0
-2,147,483,648
Counter value is somewhere in this range.
Figure 9-10
9-28
Operation Example with Reset and without Start
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Reset interrupt
generated
Counter
Disabled
Start (Active High)
1
0
Reset (Active High)
1
0
Counter
Enabled
Counter
Disabled
Reset interrupt
generated
Counter
Enabled
+2,147,483,647
Counter
Current Value
Current
value
frozen
0
Current
value
frozen
-2,147,483,648
Counter value is somewhere in this range.
Figure 9-11
Operation Example with Reset and Start
Current value loaded to 0, preset loaded to 4, counting direction set to Up.
Counter enable bit set to enabled.
Clock
Internal
Direction
Control
(1 = Up)
PV=CV interrupt generated
Direction changed within interrupt routine
1
0
1
0
4
3
3
2
Counter
Current
Value
Figure 9-12
1
0
2
1
0
-1
Operation Example of Modes 0, 1, or 2
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-29
SIMATIC Instructions
Current value loaded to 0, preset loaded to 4, counting direction set to Up.
Counter enable bit set to enabled.
PV=CV interrupt generated
PV=CV interrupt generated and
Direction Changed interrupt generated
1
0
Clock
1
External
Direction
Control
(1 = Up)
0
5
4
4
3
3
2
Counter
Current
Value
2
1
1
0
Figure 9-13
Operation Example of Modes 3, 4, or 5
When you use counting modes 6, 7, or 8 and a rising edge on both the up clock
and down clock inputs occurs within 0.3 microseconds of each other, the
high-speed counter may see these events as happening simultaneously. If this
happens, the current value is unchanged and no change in counting direction is
indicated. As long as the separation between rising edges of the up and down
clock inputs is greater than this time period, the high-speed counter captures each
event separately. In either case, no error is generated and the counter maintains
the correct count value. See Figure 9-14, Figure 9-15, and Figure 9-16.
Current value loaded to 0, preset loaded to 4, initial counting direction set to Up.
Counter enable bit set to enabled.
PV=CV interrupt generated
Count
Up
Clock
1
Count
Down
Clock
1
PV=CV interrupt generated and
Direction Changed interrupt generated
0
0
5
4
4
3
3
2
Counter
Current
Value
Figure 9-14
9-30
2
1
1
0
Operation Example of Modes 6, 7, or 8
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Current value loaded to 0, preset loaded to 3, initial counting direction set to Up.
Counter enable bit set to enabled.
PV=CV interrupt generated and
Direction Changed interrupt
generated
PV=CV interrupt
generated
Phase A 1
Clock
0
Phase B 1
Clock
0
4
3
3
2
Counter
Current
Value
0
Figure 9-15
2
1
Operation Example of Modes 9, 10, or 11 (Quadrature 1x Mode)
Current value loaded to 0, preset loaded to 9, initial counting direction set
to Up. Counter enable bit set to enabled.
PV=CV interrupt generated
Phase A
Clock
1
0
Phase B
Clock
1
PV=CV
interrupt generated
Direction Changed
interrupt generated
0
12
11
10
9
8
7
6
11
10
9
8
7
6
5
4
3
2
Counter Current
Value
0
Figure 9-16
1
Operation Example of Modes 9, 10, or 11 (Quadrature 4x Mode)
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-31
SIMATIC Instructions
Connecting the Input Wiring for the High-Speed Counters
Table 9-3 shows the inputs used for the clock, direction control, reset, and start
functions associated with the high-speed counters. These input functions and the
HSC modes of operation are described in Table 9-5 through Table 9-10.
Table 9-3
Dedicated Inputs for High-Speed Counters
Inputs Used
High-Speed Counter
HSC0
I0.0, I0.1, 0.2
HSC1
I0.6, I0.7, I1.0, I1.1
HSC2
I1.2, I1.3, I1.4, I1.5
HSC3
I0.1
HSC4
I0.3, I0.4, I0.5
HSC5
I0.4
There is some overlap in the input point assignments for some high-speed
counters and edge interrupts, as shown in the shaded area of Table 9-4. The same
input cannot be used for two different functions, however, any input not being used
by the present mode of its high-speed counter can be used for another purpose.
For example, if HSC0 is being used in mode 2 which uses I0.0 and I0.2, I0.1 can
be used for edge interrupts or for HSC3.
If a mode of HSC0 is used that does not use input I0.1, then this input is available
for use as either HSC3 or edge interrupts. Similarly, if I0.2 is not used in the
selected HSC0 mode, this input is available for edge interrupts; and if I0.4 is not
used in the selected HSC4 mode, this input is available for HSC5. Note that all
modes of HSC0 always use I0.0 and all modes of HSC4 always use I0.3, so these
points are never available for other uses when these counters are in use.
9-32
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Table 9-4
Input Point Assignments for High-Speed Counters and Edge Interrupts
Input Point (I)
Element
HSC0
0.0
x
0.1
x
0.2
0.3
0.4
0.5
0.6
0.7
1.0
1.1
x
x
x
1.4
1.5
x
HSC2
x
HSC3
1.3
x
HSC1
x
x
x
x
HSC4
x
HSC5
x
x
x
Edge
Interrupts
Table 9-5
1.2
x
x
x
x
HSC0 Modes of Operation
HSC0
Mode
0
1
3
4
6
Description
10
I0.1
I0.2
Single phase up/down counter with internal direction control
SM37.3
SM37
3 = 0,
0 count down
SM37.3 = 1, count up
Clock
Reset
Single phase up/down counter with external direction control
I0.1
I0
1 = 0,
0 count down
I0.1 = 1, count up
Two-phase counter with count up and count down clock
inputs
7
9
I0.0
Clock
Dir.
Reset
Clock
(Up)
Clock
(Dn)
Reset
A/B phase quadrature counter,
hase A leads B by 90 degrees for clockwise rotation,
phase
phase B leads A by 90 degrees for counterclockwise
rotation
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Clock Clock
Ph
Phase
Ph
Phase
Reset
A
B
9-33
SIMATIC Instructions
Table 9-6
HSC1 Modes of Operation
HSC1
Mode
0
1
Description
I0.6
I0.7
I1.0
Single phase up/down counter with internal direction control
Clock
SM47.3 = 0, count down
SM47.3 = 1, count u
up
Reset
2
3
4
5
6
7
Start
Single phase up/down counter with external direction control
Cl k
Clock
I0.7 = 0, count down
I0 7 = 1,
I0.7
1 count up
Di
Dir.
Reset
Start
Two-phase counter with count up and count down clock
i
inputs
t
Clockk
Cl
(Up))
(U
Clock
Cl
k
(Dn)
Reset
8
9
10
11
Table 9-7
I1.1
Start
A/B phase quadrature counter,
phase A leads B by 90 degrees for clockwise rotation,
phase
hase B leads A by 90 degrees for counterclockwise
rotation
Clock Clock
Phase Phase Reset
A
B
Start
HSC2 Modes of Operation
HSC2
Mode
0
1
2
3
4
5
6
Description
I1.2
I1.3
I1.4
Single phase up/down counter with internal direction control
Cl k
Clock
SM57.3 = 0, count down
SM57 3 = 1,
SM57.3
1 count up
Reset
Start
Single phase up/down counter with external direction control
Cl k
Clock
I1.3 = 0, count down
I1 3 = 1,
I1.3
1 count up
Di
Dir.
Reset
Start
Two phase counter with count up and count down clock inputs
Clockk
Cl
(Up))
(U
7
Clock
Cl
k
(Dn)
Reset
8
9
10
11
9-34
I1.5
Start
A/B phase quadrature counter,
phase A leads B by 90 degrees for clockwise rotation,
phase
hase B leads A by 90 degrees for counterclockwise
rotation
Clock Clock
Phase Phase
Reset
A
B
Start
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Table 9-8
HSC3 Modes of Operation
HSC3
Mode
0
Description
I0.1
Single phase up/down counter with internal direction control
Clock
SM137.3 = 0, count down
SM137.3 = 1, count up
Table 9-9
HSC4 Modes of Operation
HSC4
Mode
0
1
3
4
6
7
9
10
Description
I0.3
I0.4
I0.5
Single phase up/down counter with internal direction control
Clock
SM147.3
SM147
3 = 0,
0 count down
SM147.3 = 1, count up
Reset
Single phase up/down counter with external direction control
Dir.
Clock
I0.4
I0
4 = 0,
0 count down
I0.4 = 1, count up
Reset
Two phase counter with count up and count down clock inputs Clock
(U )
(Up)
A/B phase quadrature counter,
hase A leads B by 90 degrees for clockwise rotation,
phase
phase B leads A by 90 degrees for counterclockwise
rotation
Clock
(D )
(Dn)
Reset
Clock Clock
Phase Phase
A
B
Reset
Table 9-10 HSC5 Modes of Operation
HSC5
Mode
0
Description
I0.4
Single phase up/down counter with internal direction control
SM157.3 = 0, count down
SM157.3 = 1, count up
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Clock
9-35
SIMATIC Instructions
Addressing the High-Speed Counters (HC)
To access the count value for the high-speed counter, you specify the address of
the high-speed counter, using the memory type (HC) and the counter number
(such as HC0). The current value of the high-speed counter is a read-only value
and can be addressed only as a double word (32 bits), as shown in Figure 9-17.
Format: HC[high-speed counter number]
MSB
31
HC2
LSB
0
HC2
Most significant
Byte 3
Least significant
Byte 2
Byte 1
Byte 0
HC 2
High-speed counter number
Area identifier (high-speed counter)
Figure 9-17
Accessing the High-Speed Counter Current Values
Understanding the Different High-Speed Counters
All counters function the same way for the same counter mode of operation. There
are four basic types of counter modes as shown in Table 9-5. Note that every
mode is not supported by every counter. You can use each type: without reset or
start inputs, with reset and without start, or with both start and reset inputs.
When you activate the reset input, it clears the current value and holds it cleared
until you de-activate reset. When you activate the start input, it allows the counter
to count. While start is de-activated, the current value of the counter is held
constant and clocking events are ignored. If reset is activated while start is
inactive, the reset is ignored and the current value is not changed. If the start input
becomes active while the reset input is active, and the current value is cleared.
You must select the counter mode before a high-speed counter can be used. You
can do this with the HDEF instruction (High-Speed Counter Definition). HDEF
provides the association between a high-speed counter (HSCx) and a counter
mode. You can only use one HDEF instruction for each high-speed counter. Define
a high-speed counter by using the first scan memory bit, SM0.1 (this bit is turned
on for the first scan and is then turned off), to call a subroutine that contains the
HDEF instruction.
9-36
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Selecting the Active State and 1x/4x Mode
Four counters have three control bits that are used to configure the active state of
the reset and start inputs and to select 1x or 4x counting modes (quadrature
counters only). These bits are located in the control byte for the respective counter
and are only used when the HDEF instruction is executed. These bits are defined
in Table 9-11.
You must set these control bits to the desired state before the HDEF instruction is
executed. Otherwise, the counter takes on the default configuration for the counter
mode selected. The default setting of the reset input and the start input are active
high, and the quadrature counting rate is 4x (or four times the input clock
frequency). Once the HDEF instruction has been executed, you cannot change the
counter setup unless you first place the CPU in the STOP mode.
Table 9-11 Active Level for Reset, Start, and 1x/4x Control Bits
HSC0
HSC1
HSC2
HSC4
Description
(used only when HDEF is executed)
SM37.0 SM47.0 SM57.0 SM147.0
Active level control bit for Reset:
0 = Reset is active high; 1 = Reset is active low
--
Active level control bit for Start:
0 = Start is active high; 1 = Start is active low
SM47.1 SM57.1 --
SM37.2 SM47.2 SM57.2 SM147.2
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Counting rate selection for Quadrature counters:
0 = 4X counting rate; 1 = 1X counting rate
9-37
SIMATIC Instructions
Control Byte
Once you have defined the counter and the counter mode, you can program the
dynamic parameters of the counter. Each high-speed counter has a control byte
that allows the counter to be enabled or disabled; the direction to be controlled
(modes 0, 1, and 2 only), or the initial counting direction for all other modes; the
current value to be loaded; and the preset value to be loaded. Examination of the
control byte and associated current and preset values is invoked by the execution
of the HSC instruction. Table 9-12 describes each of these control bits.
Table 9-12 Control Bits for HSC0, HSC1, and HSC2
HSC4
HSC5
Description
SM37.0 SM47.0 SM57.0 SM137.0
SM147.0
SM157.0
Not used after HDEF has been executed
(Never used by counters that do not
have an external reset input)
SM37.1 SM47.1 SM57.1 SM137.1
SM147.1
SM157.1
Not used after HDEF has been executed
(Never used by counters that do not
have a start input)
SM37.2 SM47.2 SM57.2 SM137.2
SM147.2
SM157.2
Not used after HDEF has been executed
(Never used by counters that do not
support quadrature counting)
SM37.3 SM47.3 SM57.3 SM137.3
SM147.3
SM157.3
Counting direction control bit:
0 = count down; 1 = count up
SM37.4 SM47.4 SM57.4 SM137.4
SM147.4
SM157.4
Write the counting direction to the HSC:
0 = no update; 1 = update direction
SM37.5 SM47.5 SM57.5 SM137.5
SM147.5
SM157.5
Write the new preset value to the HSC:
0 = no update; 1 = update preset
SM37.6 SM47.6 SM57.6 SM137.6
SM147.6
SM157.6
Write the new current value to the HSC:
0 = no update; 1 = update current value
SM37.7 SM47.7 SM57.7 SM137.7
SM147.7
SM157.7
Enable the HSC: 0 = disable the HSC; 1
= enable the HSC
HSC0
HSC1
HSC2
HSC3
Setting Current Values and Preset Values
Each high-speed counter has a 32-bit current value and a 32-bit preset value. Both
the current and the preset values are signed integer values. To load a new current
or preset value into the high-speed counter, you must set up the control byte and
the special memory bytes that hold the current and/or preset values. You must
then execute the HSC instruction to cause the new values to be transferred to the
high-speed counter. Table 9-13 describes the special memory bytes used to hold
the new current and preset values.
In addition to the control bytes and the new preset and current holding bytes, the
current value of each high-speed counter can be read using the data type HC
(High-Speed Counter Current) followed by the number (0, 1, 2, 3, 4, or 5) of the
counter. Thus, the current value is directly accessible for read operations, but can
only be written with the HSC instruction described above.
9-38
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Table 9-13 Current and Preset Values of HSC0, HSC1, HSC2, HSC3, HSC4, and HSC5
Value to be Loaded
HSC0
HSC1
HSC2
HSC3
HSC4
HSC5
New current
SMD38
SMD48
SMD58
SMD138
SMD148
SMD158
New preset
SMD42
SMD52
SMD62
SMD142
SMD152
SMD162
Status Byte
A status byte is provided for each high-speed counter that provides status memory
bits that indicate the current counting direction, and whether the current value is
greater or equal to the preset value. Table 9-14 defines these status bits for each
high-speed counter.
Table 9-14 Status Bits for HSC0, HSC1, HSC2, HSC3, HSC4, and HSC5
HSC0
HSC1
HSC2
HSC3
HSC4
HSC5
Description
SM36.0
SM46.0
SM56.0
SM136.0
SM146.0
SM156.0
Not used
SM36.1
SM46.1
SM56.1
SM136.1
SM146.1
SM156.1
Not used
SM36.2
SM46.2
SM56.2
SM136.2
SM146.2
SM156.2
Not used
SM36.3
SM46.3
SM56.3
SM136.3
SM146.3
SM156.3
Not used
SM36.4
SM46.4
SM56.4
SM136.4
SM146.4
SM156.4
Not used
SM36.5
SM46.5
SM56.5
SM136.5
SM146.5
SM156.5
Current counting direction status bit:
0 = counting down;
1 = counting up
SM36.6
SM46.6
SM56.6
SM136.6
SM146.6
SM156.6
Current value equals preset value
status bit:
0 = not equal; 1 = equal
SM36.7
SM46.7
SM56.7
SM136.7
SM146.7
SM156.7
Current value greater than preset value
status bit:
0 = less than or equal;
1 = greater than
Note
Status bits are valid only while the high-speed counter interrupt routine is being
executed. The purpose of monitoring the state of the high-speed counter is to
enable interrupts for the events that are of consequence to the operation being
performed.
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9-39
SIMATIC Instructions
HSC Interrupts
All counter modes support an interrupt on current value equal to the preset value.
Counter modes that use an external reset input support an interrupt on external
reset activated. All counter modes except modes 0, 1, and 2 support an interrupt
on a counting direction change. Each of these interrupt conditions may be enabled
or disabled separately. For a complete discussion on the use of interrupts, see
Section 9.16.
Note
When you are using the external reset interrupt, do not attempt to load a new
current value or disable, then re-enable the high-speed counter from within the
interrupt routine attached to that event. A fatal error condition can result.
To help you understand the operation of high-speed counters, the following
descriptions of the initialization and operation sequences are provided. HSC1 is
used as the model counter throughout these sequence descriptions. The
initialization descriptions make the assumption that the S7-200 has just been
placed in the RUN mode, and for that reason, the first scan memory bit is true. If
this is not the case, remember that the HDEF instruction can be executed only one
time for each high-speed counter after entering RUN mode. Executing HDEF for a
high-speed counter a second time generates a run-time error and does not change
the counter setup from the way it was set up on the first execution of HDEF for that
counter.
9-40
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SIMATIC Instructions
Initialization Modes 0, 1, or 2
The following steps describe how to initialize HSC1 for Single Phase Up/Down
Counter with Internal Direction (Modes 0, 1, or 2):
1. Use the first scan memory bit to call a subroutine in which the initialization
operation is performed. Since you use a subroutine call, subsequent scans do
not make the call to the subroutine, which reduces scan time execution and
provides a more structured program.
2. In the initialization subroutine, load SMB47 according to the desired control
operation. For example:
SMB47 = 16#F8 produces the following results:
Enables the counter
Writes a new current value
Writes a new preset value
Sets the direction to count up
Sets the start and reset inputs to be active high
3. Execute the HDEF instruction with the HSC input set to 1 and the MODE input
set to 0 for no external reset or start, to 1 for external reset and no start, or to 2
for both external reset and start.
4. Load SMD48 (double word size value) with the desired current value (load with
0 to clear it).
5. Load SMD52 (double word size value) with the desired preset value.
6. In order to capture the current value equal to preset event, program an interrupt
by attaching the CV = PV interrupt event (event 13) to an interrupt routine. See
Section 9.16 for complete details on interrupt processing.
7. In order to capture an external reset event, program an interrupt by attaching
the external reset interrupt event (event 15) to an interrupt routine.
8. Execute the global interrupt enable instruction (ENI) to enable interrupts.
9. Execute the HSC instruction to cause the S7-200 to program HSC1.
10.Exit the subroutine.
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9-41
SIMATIC Instructions
Initialization Modes 3, 4, or 5
The following steps describe how to initialize HSC1 for Single Phase Up/Down
Counter with External Direction (Modes 3, 4, or 5):
1. Use the first scan memory bit to call a subroutine in which the initialization
operation is performed. Since you use a subroutine call, subsequent scans do
not make the call to the subroutine, which reduces scan time execution and
provides a more structured program.
2. In the initialization subroutine, load SMB47 according to the desired control
operation. For example:
SMB47 = 16#F8 produces the following results:
Enables the counter
Writes a new current value
Writes a new preset value
Sets the initial direction of the HSC to count up
Sets the start and reset inputs to be active high
3. Execute the HDEF instruction with the HSC input set to 1 and the MODE input
set to 3 for no external reset or start, 4 for external reset and no start, or 5 for
both external reset and start.
4. Load SMD48 (double word size value) with the desired current value (load with
0 to clear it).
5. Load SMD52 (double word size value) with the desired preset value.
6. In order to capture the current value equal to preset event, program an interrupt
by attaching the CV = PV interrupt event (event 13) to an interrupt routine. See
Section 9.16 for complete details on interrupt processing.
7. In order to capture direction changes, program an interrupt by attaching the
direction changed interrupt event (event 14) to an interrupt routine.
8. In order to capture an external reset event, program an interrupt by attaching
the external reset interrupt event (event 15) to an interrupt routine.
9. Execute the global interrupt enable instruction (ENI) to enable interrupts.
10.Execute the HSC instruction to cause the S7-200 to program HSC1.
11. Exit the subroutine.
9-42
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SIMATIC Instructions
Initialization Modes 6, 7, or 8
The following steps describe how to initialize HSC1 for Two Phase Up/Down
Counter with Up/Down Clocks (Modes 6, 7, or 8):
1. Use the first scan memory bit to call a subroutine in which the initialization
operations are performed. Since you use a subroutine call, subsequent scans
do not make the call to the subroutine, which reduces scan time execution and
provides a more structured program.
2. In the initialization subroutine, load SMB47 according to the desired control
operation. For example:
SMB47 = 16#F8 produces the following results:
Enables the counter
Writes a new current value
Writes a new preset value
Sets the initial direction of the HSC to count up
Sets the start and reset inputs to be active high
3. Execute the HDEF instruction with the HSC input set to 1 and the MODE set to
6 for no external reset or start, 7 for external reset and no start, or 8 for both
external reset and start.
4. Load SMD48 (double word size value) with the desired current value (load with
0 to clear it).
5. Load SMD52 (double word size value) with the desired preset value.
6. In order to capture the current value equal to preset event, program an interrupt
by attaching the CV = PV interrupt event (event 13) to an interrupt routine. See
Section 9.16 for complete details on interrupt processing.
7. In order to capture direction changes, program an interrupt by attaching the
direction changed interrupt event (event 14) to an interrupt routine.
8. In order to capture an external reset event, program an interrupt by attaching
the external reset interrupt event (event 15) to an interrupt routine.
9. Execute the global interrupt enable instruction (ENI) to enable interrupts.
10.Execute the HSC instruction to cause the S7-200 to program HSC1.
11. Exit the subroutine.
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9-43
SIMATIC Instructions
Initialization Modes 9, 10, or 11
The following steps describe how to initialize HSC1 for A/B Phase Quadrature
Counter (Modes 9, 10, or 11):
1. Use the first scan memory bit to call a subroutine in which the initialization
operations are performed. Since you use a subroutine call, subsequent scans
do not make the call to the subroutine, which reduces scan time execution and
provides a more structured program.
2. In the initialization subroutine, load SMB47 according to the desired control
operation.
For example (1x counting mode):
SMB47 = 16#FC produces the following results:
Enables the counter
Writes a new current value
Writes a new preset value
Sets the initial direction of the HSC to count up
Sets the start and reset inputs to be active high
For example (4x counting mode):
SMB47 = 16#F8 produces the following results:
Enables the counter
Writes a new current value
Writes a new preset value
Sets the initial direction of the HSC to count up
Sets the start and reset inputs to be active high
3. Execute the HDEF instruction with the HSC input set to 1 and the MODE input
set to 9 for no external reset or start, 10 for external reset and no start, or 11 for
both external reset and start.
4. Load SMD48 (double word size value) with the desired current value (load with
0 to clear it).
5. Load SMD52 (double word size value) with the desired preset value.
6. In order to capture the current value equal to preset event, program an interrupt
by attaching the CV = PV interrupt event (event 13) to an interrupt routine. See
Section 9.16 for complete details on interrupt processing.
7. In order to capture direction changes, program an interrupt by attaching the
direction changed interrupt event (event 14) to an interrupt routine.
8. In order to capture an external reset event, program an interrupt by attaching
the external reset interrupt event (event 15) to an interrupt routine.
9. Execute the global interrupt enable instruction (ENI) to enable interrupts.
10.Execute the HSC instruction to cause the S7-200 to program HSC1.
11. Exit the subroutine.
9-44
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SIMATIC Instructions
Change Direction in Modes 0, 1, or 2
The following steps describe how to configure HSC1 for Change Direction for
Single Phase Counter with Internal Direction (Modes 0, 1, or 2):
1. Load SMB47 to write the desired direction:
SMB47 = 16#90 Enables the counter
Sets the direction of the HSC to count down
SMB47 = 16#98 Enables the counter
Sets the direction of the HSC to count up
2. Execute the HSC instruction to cause the S7-200 to program HSC1.
Load a New Current Value (Any Mode)
The following steps describe how to change the counter current value of HSC1
(any mode):
Changing the current value forces the counter to be disabled while the change is
made. While the counter is disabled, it does not count or generate interrupts.
1. Load SMB47 to write the desired current value:
SMB47 = 16#C0 Enables the counter
Writes the new current value
2. Load SMD48 (double word size) with the desired current value (load with 0 to
clear it).
3. Execute the HSC instruction to cause the S7-200 to program HSC1.
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SIMATIC Instructions
Load a New Preset Value (Any Mode)
The following steps describe how to change the preset value of HSC1 (any mode):
1. Load SMB47 to write the desired preset value:
SMB47 = 16#A0 Enables the counter
Writes the new preset value
2. Load SMD52 (double word size value) with the desired preset value.
3. Execute the HSC instruction to cause the S7-200 to program HSC1.
Disable a High-Speed Counter (Any Mode)
The following steps describe how to disable the HSC1 high-speed counter (any
mode):
1. Load SMB47 to disable the counter:
SMB47 = 16#00 Disables the counter
2. Execute the HSC instruction to disable the counter.
Although the above sequences show how to change direction, current value, and
preset value individually, you may change all or any combination of them in the
same sequence by setting the value of SMB47 appropriately and then executing
the HSC instruction.
9-46
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SIMATIC Instructions
High-Speed Counter Example
LAD
STL
MAIN OB1
Network 1
SM0.1
On the first scan, call
subroutine 0.
SBR0
EN
Network 1
LD
SM0.1
CALL
0
End of main program.
SUBROUTINE 0
Network 1
SM0.0
16#F8
EN
MOV_B
ENO
IN
OUT
HDEF
EN
ENO
1 HSC
11 MODE
Enable the counter.
Write a new current value.
Write a new preset value.
Set initial direction to count
SMB47 up. Set start and reset
inputs to be active high.
Set 4x mode.
HSC1 configured for
quadrature mode with
reset and start inputs.
MOV_DW
EN
ENO
0
IN
OUT
SMD48
MOV_DW
EN
ENO
50
0
13
IN
OUT
Clear the current value of
HSC1.
Set HSC1 preset value to 50.
SMD52
ATCH
ENO
EN
INT
HSC 1 current value = preset
value (EVENT 13) attached
to interrupt routine 0.
EVENT
Global interrupt enable.
ENI
EN
1
Network 1
LD
SM0.0
MOVB
16#F8, SMB47
HDEF
1, 11
MOVD
0, SMD48
MOVD
50, SMD52
ATCH
0, 13
ENI
HSC
1
HSC
ENO
Program HSC1.
N
INTERRUPT 0
Network 1
SM0.0
Clear the current value
of HSC1.
MOV_DW
EN
ENO
0
IN
OUT
SMD48
MOV_B
EN
ENO
16#C0 IN
OUT
EN
HSC
ENO
1
Figure 9-18
Network 1
LD
SM 0.0
MOVD
0, SMD48
MOVB
16#C0, SMB47
HSC
1
Write a new current value
and enable the counter.
SMB47
Program HSC1.
N
Example of Initialization of HSC1 (LAD and STL)
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9-47
SIMATIC Instructions
FBD
MAIN OB1
Network 1
SM0.1
On the first scan, call
subroutine 0.
SBR0
EN
End of main program.
SUBROUTINE 0
Network 1
SM0.0
1
11
HDEF
EN ENO
HSC
MODE
0
ATCH
EN ENO
INT
MOV_B
EN ENO
16#F8 IN
OUT
SMB47
MOV_DW
EN
ENO
50 IN
OUT
SMD52
13
MOV_DW
EN ENO
0
IN
1
EN
N
OUT
SMD48
HSC
ENO
EVENT
ENI
INTERRUPT 0
Network 1
SM0.0
0
Figure 9-19
9-48
MOV_DW
EN ENO
IN
OUT
MOV_B
ENO
EN
SMD48
16#C0
IN
OUT
EN
SMB47
1
HSC
ENO
N
Example of Initialization of HSC1 (FBD)
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
9.6
SIMATIC Pulse Output Instructions
Pulse Output
L
A
D
PLS
EN ENO
F
B
D
Q
The Pulse Output instruction examines the special
memory bits for the pulse output (Q0.0 or Q0.1). The
pulse operation defined by the special memory bits is
then invoked.
Operands:
S
T
L
PLS
Q
3
3
3
221
222
224
Q
Constant (0 or 1)
Data Types: WORD
Pulse Output Ranges Q0.0 through Q0.1
Understanding the S7-200 High-Speed Output Instructions
The CPUs each have two PTO/PWM generators to output high-speed pulse train
and pulse width modulated waveforms. One generator is assigned to digital output
point Q0.0 and the other generator is assigned to digital output point Q0.1.
The PTO/PWM generators and the process-image register share the use of Q0.0
and Q0.1. When a PTO or PWM function is active on Q0.0 or Q0.1, the PTO/PWM
generator has control of the output, and normal use of the output point is inhibited.
The output waveform is not affected by the state of the process-image register, the
forced value of the point, or execution of immediate output instructions. When the
PTO/PWM generator is inactive, control of the output reverts to the process-image
register. The process-image register determines the initial and final state of the
output waveform, causing the waveform to start and end at a high or low level.
Note
It is recommended that the process-image register for Q0.0 and Q0.1 be set to a
value of zero before enabling PTO or PWM operation.
The pulse train (PTO) function provides a square wave (50% duty cycle) output
with user control of the cycle time and the number of pulses. The pulse width
modulation (PWM) function provides a continuous, variable duty cycle output with
user control of the cycle time and the pulse width.
Each PTO/PWM generator has a control byte (8 bits), a cycle time value and pulse
width value (unsigned 16-bit values), and a pulse count value (unsigned 32-bit
value). These values are all stored in designated locations of the special memory
(SM) area. Once these special memory bit locations have been set up to select the
desired operation, the operation is invoked by executing the Pulse Output
instruction (PLS). This instruction causes the S7-200 to read the SM locations and
program the PTO/PWM generator accordingly.
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9-49
SIMATIC Instructions
You can change the characteristics of a PTO or PWM waveform by modifying the
desired locations in the SM area (including the control byte), and then executing
the PLS instruction.
You can disable the generation of a PTO or PWM waveform at any time by writing
zero to the PTO/PWM enable bit of the control byte (SM67.7 or SM77.7), and then
executing the PLS instruction.
Note
Default values for all control bits, cycle time, pulse width, and pulse count values
are zero.
Note
The PTO/PWM outputs must have a minimum load of at least 10% of rated load to
provide crisp transitions from off to on, and from on to off.
PWM Operation
The PWM function provides for variable duty cycle output. The cycle time and the
pulse width can be specified in a time base of either microseconds or milliseconds.
The cycle time has a range either from 50 microseconds to 65,535 microseconds,
or from 2 milliseconds to 65,535 milliseconds. The pulse width time has a range
either from 0 microseconds to 65,535 microseconds, or from 0 milliseconds to
65,535 milliseconds. When the pulse width is specified to have a value greater or
equal to the cycle time value, the duty cycle of the waveform is 100% and the
output is turned on continuously. When the pulse width is specified as 0, the duty
cycle of the waveform is 0% and the output is turned off. If a cycle time of less than
two time units is specified, the cycle time defaults to two time units.
There are two different ways to change the characteristics of a PWM waveform:
with a synchronous update and with an asynchronous update.
Synchronous Update: If no time base changes are required, then a
synchronous update can be performed. With a synchronous update, the change
in the waveform characteristics occurs on a cycle boundary, providing for a
smooth transition.
Asynchronous Update: Typically with PWM operation, the pulse width is varied
while the cycle time remains constant. Therefore, time base changes are not
required. However, if a change in the time base of the PTO/PWM generator is
required, then an asynchronous update is used. An asynchronous update
causes the PTO/PWM generator to be disabled momentarily, asynchronous to
the PWM waveform. This can cause undesirable jitter in the controlled device.
For that reason, synchronous PWM updates are recommended. Choose a time
base that will work for all of your anticipated cycle time values.
9-50
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SIMATIC Instructions
The PWM Update Method bit (SM67.4 or SM77.4) in the control byte is used to
specify the update type. Execute the PLS instruction to invoke the changes. Be
aware that if the time base is changed, an asynchronous update will occur
regardless of the state of the PWM Update Method bit.
PTO Operation
The PTO function provides for the generation of a square wave (50% duty cycle)
pulse train with a specified number of pulses. The cycle time can be specified in
either microsecond or millisecond increments. The cycle time has a range either
from 50 microseconds to 65,535 microseconds, or from 2 milliseconds to 65,535
milliseconds. If the specified cycle time is an odd number, some duty cycle
distortion will result. The pulse count has a range from 1 to 4,294,967,295 pulses.
If a cycle time of less than two time units is specified, the cycle time defaults to two
time units. If a pulse count of zero is specified, the pulse count defaults to one
pulse.
The PTO Idle bit in the status byte (SM66.7 or SM76.7) is provided to indicate the
completion of the programmed pulse train. In addition, an interrupt routine can be
invoked upon the completion of a pulse train (see Section 9.16 for information
about the interrupt and communication instructions). If you are using the multiple
segment operation, the interrupt routine will be invoked upon completion of the
profile table. See Multiple Segment Pipelining below.
The PTO function allows the chaining or pipelining of pulse trains. When the active
pulse train is complete, the output of a new pulse train begins immediately. This
allows continuity between subsequent output pulse trains.
This pipelining can be done in one of two ways: in single segment pipelining or in
multiple segment pipelining.
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9-51
SIMATIC Instructions
Single Segment Pipelining In single segment pipelining, you are responsible for
updating the SM locations for the next pulse train. Once the initial PTO segment
has been started, you must modify immediately the SM locations as required for
the second waveform, and execute the PLS instruction again. The attributes of the
second pulse train will be held in a pipeline until the first pulse train is completed.
Only one entry at a time can be stored in the pipeline. Once the first pulse train is
completed, the output of the second waveform will begin and the pipeline is made
available for a new pulse train specification. You can then repeat this process to
set up the characteristics of the next pulse train.
Smooth transitions between pulse trains will occur except in the following
situations:
If a change in time base is performed
If the active pulse train is completed before a new pulse train setup is captured
by the execution of the PLS instruction.
If you attempt to load the pipeline while it is full, the PTO overflow bit in the status
register (SM66.6 or SM76.6) is set. This bit is initialized to zero on entry to RUN
mode. If you want to detect subsequent overflows, you must clear this bit manually
after an overflow is detected.
Multiple Segment Pipelining In multiple segment pipelining, the characteristics
of each pulse train segment are read automatically by the CPU from a profile table
located in V memory. The only SM locations used in this mode are the control byte
and the status byte. To select multiple segment operation, the starting V memory
offset of the profile table must be loaded (SMW168 or SMW178). The time base
can be specified to be either microseconds or milliseconds, but the selection
applies to all cycle time values in the profile table, and cannot be changed while
the profile is running. Multiple segment operation can then be started by executing
the PLS instruction.
Each segment entry is 8 bytes in length, and is composed of a 16-bit cycle time
value, a 16-bit cycle time delta value, and a 32-bit pulse count value.
9-52
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SIMATIC Instructions
The format of the profile table is shown in Table 9-15. An additional feature
available with multiple segment PTO operation is the ability to increase or
decrease the cycle time automatically by a specified amount for each pulse.
Programming a positive value in the cycle time delta field increases cycle time.
Programming a negative value in the cycle time delta field decreases cycle time. A
value of zero results in an unchanging cycle time.
If you specify a cycle time delta value that results in an illegal cycle time after a
number of pulses, a mathematical overflow condition occurs. The PTO function is
terminated, and the output reverts to image register control. In addition, the delta
calculation error bit in the status byte (SM66.4 or SM76.4) is set to a one.
If you manually abort a PTO profile in progress, the user abort bit in the status byte
(SM66.5 or SM76.5) will be set to one as a result.
While the PTO profile is operating, the number of the currently active segment is
available in SMB166 (or SMB176).
Table 9-15 Profile Table Format for Multiple Segment PTO Operation
Byte Offset From
Profile Table Start
Profile Segment
Number
0
1
Description of Table Entries
Number of segments (1 to 255); a value of 0
generates a non-fatal error. No PTO output is
generated.
#1
Initial cycle time (2 to 65535 units of the time
base)
3
Cycle time delta per pulse (signed value)
(-32768 to 32767 units of the time base)
5
Pulse count (1 to 4294967295)
9
#2
Initial cycle time (2 to 65535 units of the time
base)
11
Cycle time delta per pulse (signed value)
(-32768 to 32767 units of the time base)
13
Pulse count (1 to 4294967295)
:
:
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:
:
:
:
9-53
SIMATIC Instructions
Calculating Profile Table Values
The multiple segment pipelining capability of the PTO/PWM generators can be
useful in many applications, particularly in stepper motor control.
The example shown in Figure 9-20 illustrates how to determine the profile table
values required to generate an output waveform that accelerates a stepper motor,
operates the motor at a constant speed, and then decelerates the motor.
Frequency
10 kHz
2 kHz
Time
Segment #1
(200 pulses)
Segment #2
Segment #3
(400 Pulses)
4,000 pulses
Figure 9-20
Example Frequency vs. Time Diagram for Simple Stepper Motor Application
For this example, it is assumed that 4,000 pulses are required to achieve the
desired number of motor revolutions. The starting and final pulse frequency is
2 kHz and the maximum pulse frequency is 10 kHz. Since profile table values are
expressed in terms of period (cycle time) instead of frequency, convert the given
frequency values into cycle time values. Therefore, the starting and final cycle time
is 500 µs and the cycle time corresponding to the maximum frequency is 100 µs.
During the acceleration portion of the output profile, it is desired that the maximum
pulse frequency be reached in approximately 200 pulses. It is also assumed that
the deceleration portion of the profile should be completed in around 400 pulses.
In this example, a simple formula can be used to determine the delta cycle time
value that the PTO/PWM generator uses to adjust the cycle time of each pulse:
ÁÁÁÁ
ÁÁÁ
Á
ÁÁÁÁÁÁ
ÁÁÁ
ÁÁÁÁÁÁÁ
ÁÁ
ÁÁÁÁÁÁÁ
ÁÁÁÁ
ÁÁÁÁÁÁÁÁÁ
Á
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁ
ÁÁÁ
Á
ÁÁÁ
ÁÁÁÁ
ÁÁÁÁÁÁÁÁÁ
Á
ÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁ
delta cycle time = | ending cycle time - initial cycle time | / quantity of pulses
Using this formula, the delta cycle time for the acceleration portion (or segment #1)
is calculated to be -2. Likewise, the delta cycle time for the deceleration portion (or
segment #3) is calculated to be 1. Since segment #2 is the constant speed portion
of the output waveform, the delta cycle time value for that segment is zero.
9-54
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Assuming that the profile table is located in V memory starting at V500, the table
values used to generate the desired waveform are shown in Table 9-16.
Table 9-16 Profile Table Values
V Memory Address
VB500
Value
3 (total number of segments)
VW501
500 (initial cycle time - segment #1)
VW503
-2 (initial cycle time - segment #1)
VW505
200 (number of pulses - segment #1)
VW509
100 (initial cycle time - segment #2)
VW511
0 (delta cycle time - segment #2)
VW513
3400 (number of pulses - segment #2)
VW517
100 initial cycle time - segment #3)
VW519
1 (delta cycle time - segment #3)
VD521
400 (number of pulses - segment #3)
The values of this table can be placed in V memory by using instructions in your
program. An alternate method is to define the values of the profile in the data
block. An example containing the program instructions to use the multiple segment
PTO operation is shown in Figure 9-23.
The cycle time of the last pulse of a segment is not directly specified in the profile,
but instead must be calculated (except of course for the case in which the delta
cycle time is zero). Knowing the cycle time of a segment’s last pulse is useful to
determine if the transitions between waveform segments are acceptable. The
formula for calculating the cycle time of a segment’s last pulse is:
ÁÁÁÁ
ÁÁ
Á
ÁÁÁÁÁÁ
ÁÁÁ
ÁÁÁÁÁÁÁ
ÁÁÁ
ÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁ
Á
ÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁ
ÁÁÁÁÁÁÁÁ
Á
ÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁ
Á
ÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁ
cycle time of last pulse=initial cycle time + (delta cycle time * (number of pulses - 1))
While the simplified example above is useful as an introduction, real applications
may require more complicated waveform profiles. Remember that:
The delta cycle time can be specified only as an integer number of
microseconds or milliseconds
The cycle time modification is performed on each pulse
The effect of these two items is that calculation of the delta cycle time value for a
given segment may require an iterative approach. Some flexibility in the value of
the ending cycle time or the number of pulses for a given segment may be
required.
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-55
SIMATIC Instructions
The duration of a given profile segment can be useful in the process of determining
correct profile table values. The length of time to complete a given profile segment
can be calculated using the following formula:
ÁÁÁÁ
ÁÁÁ
Á
ÁÁÁÁÁÁ
ÁÁÁ
ÁÁÁÁÁÁÁ
ÁÁ
ÁÁÁÁÁÁÁ
ÁÁÁÁ
ÁÁÁ
Á
ÁÁÁÁÁÁ
ÁÁÁ
ÁÁÁÁÁÁÁ
ÁÁ
ÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁ
ÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Á
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁ
ÁÁÁ
Á
ÁÁÁÁÁÁ
ÁÁÁ
ÁÁÁÁÁÁÁ
ÁÁ
ÁÁÁÁÁÁÁ
ÁÁÁÁ
ÁÁÁÁÁÁÁÁÁ
Á
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
duration = no. of pulses *(initial cycle time + ((delta cycle time / 2) * (no. of pulses-1)))
PTO/PWM Control Registers
Table 9-17 describes the registers used to control the PTO/PWM operation. You
can use Table 9-18 as a quick reference to determine the value to place in the
PTO/PWM control register to invoke the desired operation. Use SMB67 for
PTO/PWM 0, and SMB77 for PTO/PWM 1. If you are going to load the new pulse
count (SMD72 or SMD82), pulse width (SMW70 or SMW80), or cycle time
(SMW68 or SMW78), you should load these values as well as the control register
before you execute the PLS instruction. If you are using the multiple segment
pulse train operation, you also need to load the starting offset (SMW168 or
SMW178) of the profile table and the profile table values before you execute the
PLS instruction.
9-56
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Table 9-17 PTO /PWM Control Registers
Q0.0
Q0.1
Status Byte
SM66.4
SM76.4
PTO profile aborted due to delta calculation error
0 = no error;
1 = aborted
SM66.5
SM76.5
PTO profile aborted due to user command
0 = no abort;
1 = aborted
SM66.6
SM76.6
PTO pipeline overflow/underflow
0 = no overflow; 1 = overflow/underflow
SM66.7
SM76.7
PTO idle
Q0.0
Q0.1
SM67.0
SM77.0
PTO/PWM update cycle time value 0 = no update;
1 = update cycle time
SM67.1
SM77.1
PWM update pulse width time value 0 = no update;
1 = update pulse width
SM67.2
SM77.2
PTO update pulse count value
0 = no update;
1 = update pulse count
SM67.3
SM77.3
PTO/PWM time base select
0 = 1 µs/tick;
1 = 1ms/tick
SM67.4
SM77.4
PWM update method:
0 = asynchronous update, 1 = synchronous update
SM67.5
SM77.5
PTO operation: 0 = single segment operation 1 = multiple segment operation
SM67.6
SM77.6
PTO/PWM mode select
0 = selects PTO;
SM67.7
SM77.7
PTO/PWM enable
0 = disables PTO/PWM;
0 = in progress;
1 = PTO idle
Control Byte
1 = selects PWM
1 = enables PTO/PWM
Q0.0
Q0.1
Other PTO/PWM Registers
SMW68
SMW78
PTO/PWM cycle time value (range: 2 to 65535)
SMW70
SMW80
PWM pulse width value (range: 0 to 65535)
SMD72
SMD82
PTO pulse count value (range: 1 to 4294967295)
SMB166
SMB176
Number of segment in progress (used only in multiple segment PTO operation)
SMW168 SMW178 Starting location of profile table, expressed as a byte offset from V0 (used only in
multiple segment PTO operation)
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-57
SIMATIC Instructions
Table 9-18 PTO/PWM Control Byte Reference
Result of executing the PLS instruction
Control
Register
(Hex
Enable
Value)
Select
Mode
PTO
Segment
Operation
16#81
Yes
PTO
Single
1 µs/cycle
16#84
Yes
PTO
Single
1 µs/cycle
Load
16#85
Yes
PTO
Single
1 µs/cycle
Load
16#89
Yes
PTO
Single
1 ms/cycle
16#8C
Yes
PTO
Single
1 ms/cycle
Load
16#8D
Yes
PTO
Single
1 ms/cycle
Load
16#A0
Yes
PTO
Multiple
1 µs/cycle
16#A8
Yes
PTO
Multiple
1 ms/cycle
16#D1
Yes
PWM
Synchronous
1 µs/cycle
16#D2
Yes
PWM
Synchronous
1 µs/cycle
Load
16#D3
Yes
PWM
Synchronous
1 µs/cycle
Load
16#D9
Yes
PWM
Synchronous
1 ms/cycle
16#DA
Yes
PWM
Synchronous
1 ms/cycle
Load
16#DB
Yes
PWM
Synchronous
1 ms/cycle
Load
PWM Update
Method
Time Base
Pulse
Count
Pulse
Width
Cycle
Time
Load
Load
Load
Load
Load
Load
Load
Load
PTO/PWM Initialization and Operation Sequences
Descriptions of the initialization and operation sequences follow. They can help you
better understand the operation of PTO and PWM functions. The pulse output
Q0.0 is used throughout these sequence descriptions. The initialization
descriptions assume that the S7-200 has just been placed in RUN mode, and for
that reason the first scan memory bit is true. If this is not the case, or if the
PTO/PWM function must be re-initialized, you can call the initialization routine
using a condition other than the first scan memory bit.
9-58
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
PWM Initialization
To initialize the PWM for Q0.0, follow these steps:
1. Use the first scan memory bit (SM0.1) to initialize the output to 0, and call the
subroutine that you need in order to perform the initialization operations. When
you use the subroutine call, subsequent scans do not make the call to the
subroutine. This reduces scan time execution and provides a more structured
program.
2. In the initialization subroutine, load SMB67 with a value of 16#D3 for PWM
using microsecond increments (or 16#DB for PWM using millisecond
increments). These values set the control byte to enable the PTO/PWM
function, select PWM operation, select either microsecond or millisecond
increments, and set the update pulse width and cycle time values.
3. Load SMW68 (word size value) with the desired cycle time.
4. Load SMW70 (word size value) with the desired pulse width.
5. Execute the PLS instruction so that the S7-200 programs the PTO/PWM
generator.
6. Load SMB67 with a value of 16#D2 for microsecond increments (or 16#DA for
millisecond increments). This preloads a new control byte value for subsequent
pulse width changes.
7. Exit the subroutine.
Changing the Pulse Width for PWM Outputs
To change the pulse width for PWM outputs in a subroutine, follow these steps. (It
is assumed that SMB67 was preloaded with a value of 16#D2 or 16#DA.)
1. Call a subroutine to load SMW70 (word size value) with the desired pulse width.
2. Execute the PLS instruction to cause the S7-200 to program the PTO/PWM
generator.
3. Exit the subroutine.
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-59
SIMATIC Instructions
PTO Initialization - Single Segment Operation
To initialize the PTO, follow these steps:
1. Use the first scan memory bit (SM0.1) to initialize the output to 0, and call the
subroutine that you need to perform the initialization operations. This reduces
scan time execution and provides a more structured program.
2. In the initialization subroutine, load SMB67 with a value of 16#85 for PTO using
microsecond increments (or 16#8D for PTO using millisecond increments).
These values set the control byte to enable the PTO/PWM function, select PTO
operation, select either microsecond or millisecond increments, and set the
update pulse count and cycle time values.
3. Load SMW68 (word size value) with the desired cycle time.
4. Load SMD72 (double word size value) with the desired pulse count.
5. This is an optional step. If you want to perform a related function as soon as the
pulse train output is complete, you can program an interrupt by attaching the
pulse train complete event (Interrupt Category 19) to an interrupt subroutine,
using the ATCH instruction, and executing the global interrupt enable instruction
ENI. Refer to Section 9.16 for complete details on interrupt processing.
6. Execute the PLS instruction to cause the S7-200 to program the PTO/PWM
generator.
7. Exit the subroutine.
Changing the PTO Cycle Time - Single Segment Operation
To change the PTO Cycle Time in an interrupt routine or subroutine when using
single segment PTO operation, follow these steps:
1. Load SMB67 with a value of 16#81 for PTO using microsecond increments (or
16#89 for PTO using millisecond increments). These values set the control byte
to enable the PTO/PWM function, select PTO operation, select either
microsecond or millisecond increments, and set the update cycle time value.
2. Load SMW68 (word size value) with the desired cycle time.
3. Execute the PLS instruction to cause the S7-200 to program the PTO/PWM
generator. The CPU must complete any PTO that is in process before output of
the PTO waveform with the updated cycle time begins.
4. Exit the interrupt routine or the subroutine.
9-60
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Changing the PTO Pulse Count - Single Segment Operation
To change the PTO Pulse Count in an interrupt routine or a subroutine when using
single segment PTO operation, follow these steps:
1. Load SMB67 with a value of 16#84 for PTO using microsecond increments (or
16#8C for PTO using millisecond increments). These values set the control
byte to enable the PTO/PWM function, select PTO operation, select either
microsecond or millisecond increments, and set the update pulse count value.
2. Load SMD72 (double word size value) with the desired pulse count.
3. Execute the PLS instruction to cause the S7-200 to program the PTO/PWM
generator. The CPU must complete any PTO that is in process before output of
the waveform with the updated pulse count begins.
4. Exit the interrupt routine or the subroutine.
Changing the PTO Cycle Time and the Pulse Count - Single Segment Operation
To change the PTO Cycle Time and Pulse Count in an interrupt routine or a
subroutine when using single segment PTO operation, follow these steps:
1. Load SMB67 with a value of 16#85 for PTO using microsecond increments (or
16#8D for PTO using millisecond increments). These values set the control
byte to enable the PTO/PWM function, select PTO operation, select either
microsecond or millisecond increments, and set the update cycle time and
pulse count values.
2. Load SMW68 (word size value) with the desired cycle time.
3. Load SMD72 (double word size value) with the desired pulse count.
4. Execute the PLS instruction so that the S7-200 programs the PTO/PWM
generator. The CPU must complete any PTO that is in process before output of
the waveform with the updated pulse count and cycle time begins.
5. Exit the interrupt routine or the subroutine.
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-61
SIMATIC Instructions
PTO Initialization - Multiple Segment Operation
To initialize the PTO, follow these steps:
1. Use the first scan memory bit (SM0.1) to initialize the output to 0, and call the
subroutine that you need to perform the initialization operations. This reduces
the scan time execution and provides a more structured program.
2. In the initialization subroutine, load SMB67 with a value of 16#A0 for PTO using
microsecond increments (or 16#A8 for PTO using millisecond increments).
These values set the control byte to enable the PTO/PWM function, select PTO
and multiple segment operation, and select either microsecond or millisecond
increments
3. Load SMW168 (word size value) with the starting V memory offset of the profile
table.
4. Set up the segment values in the profile table. Ensure that the Number of
Segment field (the first byte of the table) is correct.
5. This is an optional step. If you want to perform a related function as soon as the
PTO profile is complete, you can program an interrupt by attaching the pulse
train complete event (Interrupt Category 19) to an interrupt subroutine. Use the
ATCH instruction, and execute the global interrupt enable instruction ENI. Refer
to Section 9.16 for complete details on interrupt processing.
6. Execute the PLS instruction. The S7-200 programs the PTO/PWM generator.
7. Exit the subroutine.
9-62
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Example of Pulse Width Modulation
Figure 9-21 shows an example of the Pulse Width Modulation.
LAD
STL
MAIN OB1
Network 1
SM0.1
Q0.1
R
1
On the first scan, set
image register bit low, and
call subroutine 0.
SBR0
Network 2
When pulse width change to
50% duty cycle is required,
M0.0 is set.
M0.0
P
SBR1
.
.
End of main ladder.
Network 1
LD
SM0.1
R
Q0.1, 1
CALL
0
Network 2
LD
M0.0
EU
CALL
1
.
.
SUBROUTINE 0
Start of subroutine 0.
Network 1
SM0.0
16#DB
EN
MOV_B
ENO
IN
OUT
MOV_W
ENO
IN
OUT
EN
10000
Set up control byte:
- select PWM operation
- select ms increments
SMB77 synchronous updates
- set the pulse width and
cycle time values
- enable the PWM function
SMW78 Set cycle time to
10,000 ms.
Network 1
LD
SM0.0
MOVB
16#DB, SMB77
MOVW
10000, SMW78
MOVW
1000, SMW80
PLS
1
MOVB
16#DA, SMB77
MOV_W
1000
EN
ENO
IN
OUT
EN
PLS
ENO
Set pulse width to
SMW80 1,000 ms.
.
.
.
Invoke PWM operation.
PLS 1 => Q0.1
1 Q0.x
.
.
Preload control byte for
subsequent pulse width
changes.
MOV_B
EN
ENO
16#DA
IN
OUT
EN
MOV_W
ENO
SMB77
SUBROUTINE 1
SM0.0
5000
1
Figure 9-21
OUT SMW80
IN
EN
Start of subroutine 1
Set pulse width to 5000 ms
PLS
ENO
Network 1
LD
SM0.0
MOVW
5000, SMW80
PLS
1
Assert pulse width change.
Q0.X
Example of High-Speed Output Using Pulse Width Modulation
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-63
SIMATIC Instructions
FBD
MAIN OB1
Network 1
Q0.1
AND
R
EN
SM0.1
1
SM0.0
N
SBR0
EN
Network 2
AND
P
M0.0
IN
SBR1
EN
OUT
SM0.0
SUBROUTINE 0
Network 1
SM0.0
MOV_B
EN ENO
16#DB
IN
OUT
MOV_W
SMB77
10000
MOV_W
EN
ENO
IN
OUT
SMW78
1000
EN
ENO
IN
OUT
PLS
EN
SMW80
1
MOV_B
ENO
Q0.x
16#DA
EN
ENO
IN
OUT
SMB77
SUBROUTINE 1
Network 61
SM0.0
5000
MOV_W
EN ENO
IN
OUT
EN
SMW80
1
PLS
ENO
Q0.X
Timing Diagram
Q0.1
10% duty cycle
10% duty cycle
50% duty cycle
50% duty cycle
Subroutine 1
executed here
(cycle time = 10,000 ms)
Figure 9-21
9-64
Example of High-Speed Output Using Pulse Width Modulation (continued)
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Example of Pulse Train Output Using Single Segment Operation
LAD
STL
MAIN
MAIN
OB1
OB1
Network 1
Q0.0
R
1
SM0.1
On the first scan,
reset image
register bit low, and
call subroutine 0.
SBR0
EN
Network 1
LD
SM0.1
R
Q0.0, 1
CALL
0
SUBROUTINE 0
Network 1
Set up control byte:
- select PTO operation
- select ms increments
SMB67- set the pulse count and
cycle time values
- enable the PTO function
MOV_B
EN ENO
SM0.0
16#8D
IN OUT
MOV_W
EN ENO
500
Set cycle time to 500 ms.
IN OUT
SMW68
MOV_DW
EN ENO
4
Set pulse count to 4 pulses.
IN OUT
SMD72
ATCH
3
Network 1
LD
SM0.0
MOVB
16#8D, SMB67
MOVW
500, SMW68
MOVD
4, SMD72
ATCH
3, 19
ENI
PLS
0
MOVB
16#89, SMB67
Define interrupt routine 3 to
be the interrupt for
processing PTO complete
interrupts.
EN ENO
INT
19 EVNT
ENI
PLS
EN ENO
0
Invoke PTO operation.
PLS 0 => Q0.0
Q0.X
MOV_B
EN ENO
16#89 IN OUT
Figure 9-22
Global interrupt enable.
Preload control byte for
subsequent cycle time
changes.
SMB67
Example of a Pulse Train Output Using Single Segment Operation in
SM Memory
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-65
SIMATIC Instructions
LAD
STL
INTERRUPT 3
Network 1
SMW68
==I
500
MOV_W
EN ENO
1000 IN
OUT
EN
PLS
ENO
If current cycle time
is 500 ms, then set
cycle time of 1000 ms
SMW68 and output 4 pulses.
Network
LDW=
MOVW
PLS
CRETI
1
SMW68, 500
1000, SMW68
0
If current cycle time
is 1000 ms, then set
cycle time of 500 ms
SMW68 and output 4 pulses.
Network
LDW=
MOVW
PLS
2
SMW68, 1000
500, SMW68
0
0 Q
RETI
Network 2
SMW68
==I
1000
MOV_W
EN ENO
500
IN
EN
OUT
PLS
ENO
0 Q0.X
Timing Diagram
1 cycle
500 ms
1 cycle
1000 ms
Q0.0
4 cycles or 4 pulses
4 cycles or 4 pulses
Interrupt 3
occurs
Interrupt 3
occurs
Figure 9-22 Example of a Pulse Train Output Using Single Segment Operation (continued)
9-66
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
FBD
MAIN OB1
Network 1
Q0.0
R
SM0.1
EN
1
IN
SBR0
EN
ENO
SUBROUTINE 0
Network 1
MOV_B
SM0.0
16#8D
EN
IN
EN
3
MOV_DW
MOV_W
ENO
OUT SMB67
EN
500 IN
ATCH
ENO
ENO
OUT
4
SMW68
EN ENO
IN OUT
SMD72
ENI
INT
19 EVNT
EN
0
PLS
ENO
Q0.X
MOV_B
EN
ENO
16#89
IN
OUT
SMB67
INTERRUPT 3
Network 1
==I
MOV_W
EN ENO
SMW68
1000
500
IN
OUT
EN
SMW68
PLS
ENO
RETI
0 Q0.x
Network 2
==I
SMW68
1000
500
MOV_W
EN ENO
IN OUT SMW68
EN
0
PLS
ENO
Q0.X
Figure 9-22 Example of a Pulse Train Output Using Single Segment Operation (continued)
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-67
SIMATIC Instructions
Example of Pulse Train Output Using Multiple Segment Operation
LAD
STL
MAIN
MAIN
OB1
OB1
Network 1
Q0.0
R
1
SM0.1
On the first scan,
reset image
register bit low, and
call subroutine 0.
SBR0
EN
Network 1
LD
SM0.1
R
Q0.0, 1
CALL
0
SUBROUTINE 0
Network 1
MOV_B
EN ENO
SM0.0
16#AO
IN OUT
SMB67
MOV_W
EN ENO
500
IN OUT
Specify that the start address
of the profile table is V500.
IN OUT
Set number of profile
table segments to 3.
VB500
Set the initial cycle time for
segment #1 to 500 µs
MOV_W
EN ENO
500
IN OUT VW501
Set the delta cycle time for
segment #1 to -2 µs
MOV_W
EN ENO
-2
IN OUT
VW503
MOV_D
EN ENO
200
Figure 9-23
9-68
Network 1
LD
SM0.0
MOVB
16#A0, SMB67
MOVW
500, SMW168
MOVB
3, VB500
MOVW
500, VW501
MOVW
-2, VD503
MOVD
200, VD505
SMW168
MOV_B
EN ENO
3
Set up control byte:
- select PTO operation
- select multiple segment
operation
select µs increments
- enable the PTO function
IN OUT
Set the number of pulses
in segment #1 to 200.
VD505
Example of a Pulse Train Output Using Multiple Segment Operation
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
LAD
Network 1
MOV_W
EN ENO
100
IN OUT
VW509
MOV_W
EN ENO
0
IN OUT
Set the delta cycle time for
segment #2 to 0 µs.
VW511
MOV_D
EN ENO
3400 IN OUT
IN OUT
100, VW509
0, VW511
3400, VD513
100, VW517
1, VW519
400, VD521
2, 19
0
VD513
Set the initial cycle time for
segment #3 to 100 µs.
VW517
MOV_W
EN ENO
1
MOVW
MOVW
MOVD
MOVW
MOVW
MOVD
ATCH
ENI
PLS
Set the number of pulses
in segment #2 to 3400.
MOV_W
EN ENO
100 IN OUT
Set the initial cycle time for
segment #2 to 100 µs.
STL
Set the delta cycle time for
segment #3 to 1.
VW519
MOV_D
EN ENO
Set the number of pulses
in segment #3 to 400.
400 IN OUT VD521
2
ATCH
EN ENO
INT
Define interrupt routine 2 to
process PTO complete
interrupts.
19 EVNT
ENI
PLS
EN ENO
0
Global interrupt enable.
Invoke PTO operation
PLS 0 => Q0.0.
QO.X
INTERRUPT 2
Network 1
SM0.0
Figure 9-74
Q0.5
Turn on output Q0.5 when
PTO output profile is complete.
Network 1
LD
=
SM0.0
Q0.5
Example of Pulse Train Output Using Multiple Segment Operation (continued)
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-69
SIMATIC Instructions
9.7
SIMATIC Clock Instructions
Read Real-Time Clock, Set Real-Time Clock
L
A
D
READ_RTC
EN
ENO
F
B
D
T
SET_RTC
EN
ENO
The Set Real-Time Clock instruction writes the current
time and date loaded in an 8-byte buffer (starting at
address T) to the clock.
In STL, the TODR and TODW instructions are
represented as Time of Day Read (TODR) and Time of
Day Write (TODW).
T
S
T
L
The Read Real-Time Clock instruction reads the current
time and date from the clock and loads it in an 8-byte
buffer (starting at address T).
TODR: Error conditions that set ENO = 0:
SM4.3 (run-time), 0006 (indirect address),
000C (clock cartridge not present)
TODR T
TODW T
3
3
3
221
222
224
TODW: Error conditions that set ENO = 0:
SM 4.3 (run-time), 0006 (indirect address),
0007 (TOD data error), 000C (clock cartridge not
present)
Inputs/Outputs
T
Operands
Data Types
VB, IB, QB, MB, SMB, SB, LB, *VD, *AC, *LD
BYTE
Figure 9-24 shows the format of the time buffer (T).
T
year
Figure 9-24
9-70
T+1
T+2
T+3
T+4
T+5
T+6
month
day
hour
minute
second
0
T+7
day of
week
Format of the Time Buffer
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
The time-of-day clock initializes the following date and time after extended power
outages or memory has been lost:
Date:
Time:
Day of Week
01-Jan-90
00:00:00
Sunday
The time-of-day clock in the S7-200 uses only the least significant two digits for the
year, so for the year 2000, the year will be represented as 00 (it will go from 99 to
00).
You must code all date and time values in BCD format (for example, 16#97 for the
year 1997). Use the following data formats:
Year/Month
Day/Hour
Minute/Second
Day of week
yymm
ddhh
mmss
d
yy dd mm d-
0 to 99
1 to 31
0 to 59
0 to 7
mm - 1 to 12
hh - 0 to 23
ss - 0 to 59
1 = Sunday
0 = disables day of week
(remains 0)
Note
The S7-200 CPU does not perform a check to verify that the day of week is
correct based upon the date. Invalid dates, such as February 30, may be
accepted. You should ensure that the date you enter is correct.
Do not use the TODR/TODW instruction in both the main program and in an
interrupt routine. A TODR/TODW instruction in an interrupt routine which attempts
to execute while another TODR/TODW instruction is in process will not be
executed. SM4.3 is set indicating that two simultaneous accesses to the clock
were attempted (non-fatal error 0007).
The S7-200 PLC does not use the year information in any way and will not be
affected by the century rollover (year 2000). However, user programs that use
arithmetic or compares with the year’s value must take into account the two-digit
representation and the change in century.
Leap year is correctly handled through year 2096.
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-71
SIMATIC Instructions
9.8
SIMATIC Integer Math Instructions
Add Integer and Subtract Integer
L
A
D
ADD_I
ENO
EN
F
B
D
IN1 OUT
OUT
The Add Integer and Subtract Integer instructions add
or subtract two 16-bit integers and produce a 16-bit result
(OUT).
In LAD and FBD:
IN1 + IN2 = OUT
IN1 - IN2 = OUT
In STL:
IN1 + OUT = OUT
OUT - IN1 = OUT
IN2
SUB_I
EN
ENO
IN1 OUT
OUT
IN2
S
T
L
Inputs/Outputs
Error conditions that set ENO = 0: SM1.1 (overflow),
SM4.3 (run-time), 0006 (indirect address)
These instructions affect the following Special Memory
bits: SM1.0 (zero); SM1.1 (overflow); SM1.2 (negative)
+I
IN1, OUT
-I
IN1, OUT
3
3
3
221
222
224
Operands
Data Types
IN1, IN2
VW, IW, QW, MW, SW, SMW, LW, AIW, T, C, AC, Constant, *VD,
*AC, *LD
INT
OUT
VW, IW, QW, MW, SW, SMW, LW, T, C, AC, *VD, *AC, *LD
INT
9-72
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Add Double Integer and Subtract Double Integer
L
A
D
F
B
D
ADD_DI
EN
ENO
The Add Double Integer and Subtract Double Integer
instructions add or subtract two 32-bit integers, and
produce a 32-bit result (OUT).
IN1 OUT
OUT
In LAD and FBD:
IN1 + IN2 = OUT
IN1 - IN2 = OUT
In STL:
IN1 + OUT = OUT
OUT - IN1 = OUT
IN2
SUB_DI
EN
ENO
IN1 OUT
OUT
IN2
S
T
L
Error conditions that set ENO = 0: SM1.1 (overflow),
SM4.3 (run-time), 0006 (indirect address)
These instructions affect the following Special Memory
bits: SM1.0 (zero); SM1.1 (overflow); SM1.2 (negative)
+D
IN1, OUT
-D
IN1, OUT
3
3
3
221
222
224
Inputs/Outputs
Operands
Data Types
IN1, IN2
VD, ID, QD, MD, SMD, SD, LD, AC, HC, Constant, *VD, *AC, *LD
DINT
OUT
VD, ID, QD, MD, SM, SD, LD, AC, *VD, *AC, *LD
DINT
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-73
SIMATIC Instructions
Multiply Integer and Divide Integer
L
A
D
MUL_I
EN
ENO
F
B
D
IN1 OUT
OUT
The Multiply Integer instruction multiplies two 16-bit
integers and produces a 16-bit product.
The Divide Integer instruction divides two 16-bit integers
and produces a 16-bit quotient. No remainder is kept.
The overflow bit is set if the result is greater than a word
output.
IN2
DIV_I
EN
ENO
IN1 OUT
OUT
In LAD and FBD: IN1<IN2 = OUT
IN1 / IN2 = OUT
In STL:
IN2
S
T
L
*I
IN1, OUT
/I
IN1, OUT
3
3
3
221
222
224
IN1<OUT = OUT
OUT / IN1 = OUT
Error conditions that set ENO = 0: SM1.1 (overflow),
SM1.3 (divide-by-zero), SM4.3 (run-time), 0006 (indirect
address)
These instructions affect the following Special Memory
bits: SM1.0 (zero); SM1.1 (overflow); SM1.2 (negative);
SM1.3 (divide-by-zero)
If SM1.1 (overflow) is set during a multiply or divide operation, the output is not
written and all other math status bits are set to zero.
If SM1.3 (divide by zero) is set during a divide operation, then the other math
status bits are left unchanged and the original input operands are not altered.
Otherwise, all supported math status bits contain valid status upon completion of
the math operation.
Inputs/Outputs
Operands
Data Types
IN1, IN2
VW, IW, QW, MW, SW, SMW, LW, AIW, T, C, AC, Constant, *VD,
*AC, *LD
INT
OUT
VW, QW, IW, MW, SW, SMW, LW, T, C, AC, *VD, *LD, *AC
INT
9-74
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Multiply Double Integer and Divide Double Integer
L
A
D
MUL_DI
EN
ENO
F
B
D
IN1 OUT
OUT
IN2
DIV_DI
EN
ENO
IN1 OUT
OUT
IN2
S
T
L
3
221
The Multiply Double Integer instruction multiplies two
32-bit integers and produces a 32-bit product.
The Divide Double Integer instruction divides two 32-bit
integers and produces a 32-bit quotient. No remainder is
kept.
In LAD and FBD: IN1<IN2 = OUT
IN1 / IN2 = OUT
In STL:
IN1<OUT = OUT
OUT / IN1 = OUT
Error conditions that set ENO = 0: SM1.1 (overflow),
SM1.3 (divide-by-zero), SM4.3 (run-time), 0006 (indirect
address)
*D
IN1, OUT
/D
IN1, OUT
3
3
222
224
These instructions affect the following Special Memory
bits: SM1.0 (zero); SM1.1 (overflow); SM1.2 (negative);
SM1.3 (divide-by-zero)
If SM1.1 (overflow) is set during a multiply or divide
operation, the output is not written and all other math
status bits are set to zero.
If SM1.3 (divide by zero) is set during a divide operation, then the other math
status bits are left unchanged and the original input operands are not altered.
Otherwise, all supported math status bits contain valid status upon completion of
the math operation.
Inputs/Outputs
Operands
Data Types
IN1, IN2
VD, ID, QD, MD, SMD, SD, LD, HC, AC, Constant, *VD, *AC, *LD
DINT
OUT
VD, ID, QD, MD, SMD, SD, LD, AC, *VD, *LD, *AC
DINT
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-75
SIMATIC Instructions
Multiply Integer To Double Integer and Divide Integer to Double Integer
L
A
D
MUL
ENO
EN
F
B
D
IN1 OUT
OUT
IN2
DIV
EN
The Divide Integer to Double Integer instruction
divides two 16-bit integers and produces a 32-bit result
consisting of a 16-bit remainder (most-significant) and a
16-bit quotient (least-significant).
ENO
IN1 OUT
OUT
In the STL Multiply instruction, the least-significant word
(16 bits) of the 32-bit OUT is used as one of the factors.
In the STL Divide instruction, the least-significant word
(16 bits) of the 32-bit OUT is used as the dividend.
IN2
S
T
L
The Multiply Integer to Double Integer instruction
multiplies two 16-bit integers and produces a 32-bit
product.
MUL
IN1, OUT
DIV
IN1, OUT
3
3
3
221
222
224
In LAD and FBD: IN1<IN2 = OUT
IN1 / IN2 = OUT
In STL:
IN1<OUT = OUT
OUT / IN1 = OUT
Error conditions that set ENO = 0: SM1.1 (overflow),
SM1.3 (divide-by-zero), SM4.3 (run-time), 0006 (indirect
address)
These instructions affect the following Special Memory bits: SM1.0 (zero); SM1.1
(overflow); SM1.2 (negative); SM1.3 (divide-by-zero)
If SM1.3 (divide by zero) is set during a divide operation, then the other math
status bits are left unchanged and the original input operands are not altered.
Otherwise, all supported math status bits contain valid status upon completion of
the math operation.
Inputs/Outputs
Operands
Data Types
IN1, IN2
VW, IW, QW, MW, SW, SMW, LW, AC, AIW, T, C, Constant, *VD,
*AC, *LD
INT
OUT
VD, ID, QD, MD, SMD, SD, LD, AC, *VD, *LD, *AC
DINT
9-76
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Math Examples
LAD
STL
Network 1
I0.0
EN
ADD_I
ENO
AC1
IN1 OUT
OUT
AC0
IN2
EN
AC0
MUL
ENO
IN1 OUT
OUT
AC1
VW102
VD100
IN2
EN
DIV
ENO
OUT
VW202 IN1 OUT
VW10
NETWORK 1
LD
I0.0
+I
AC1, AC0
MUL
AC1, VD100
DIV
VW10, VD200
VD200
IN2
FBD
Network 1
I0.0
ADD_I
EN
ENO
AC1
IN1 OUT
OUT
AC0
IN2
MUL
ENO
EN
AC0
AC1
IN1 OUT
OUT
VW102
DIV
ENO
EN
VD100
VW202
VW10
IN2
IN1 OUT
OUT
VD200
IN2
Application
Add
AC1
Multiply
4000
AC1
plus
AC0
4000
VD200
4000
multiplied by
6000
VD100
200
VD100
800000
equals
AC0
Divide
divided by
VW10
41
equals
10000
equals
VD200
23
97
rem. quot.
VW200 VW202
Note: VD100 contains VW100 and VW102.
VD200 contains VW200 and VW202.
Figure 9-25
Examples of Integer Math Instructions for LAD, STL, and FBD
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-77
SIMATIC Instructions
Increment Byte and Decrement Byte
L
A
D
F
B
D
INC_B
EN
ENO
The Increment Byte and Decrement Byte instructions
add or subtract 1 to or from the input byte (IN) and place
the result into the variable specified by OUT.
IN
Increment and decrement byte operations are unsigned.
OUT
DEC_B
EN
ENO
IN
S
T
L
OUT
INCB
OUT
DECB
OUT
3
3
3
221
222
224
Inputs/Outputs
In LAD and FBD: IN + 1 = OUT
IN - 1 = OUT
In STL:
OUT+ 1 = OUT
OUT - 1 = OUT
Error conditions that set ENO = 0: SM1.1 (overflow),
SM4.3 (run-time), 0006 (indirect address)
These instructions affect the following Special Memory
bits: SM1.0 (zero); SM1.1 (overflow)
Operands
Data Types
IN
VB, IB, QB, MB, SB, SMB, LB, AC, Constant, *VD, *AC, *LD
BYTE
OUT
VB, IB, QB, MB, SB, SMB, LB, AC,*VD, *AC, *LD
BYTE
Increment Word and Decrement Word
L
A
D
INC_W
EN ENO
F
B
D
IN
S
T
L
Inputs/Outputs
OUT
The Increment Word and Decrement Word instructions
add or subtract 1 to or from the input word (IN) and place
the result in OUT.
Increment and decrement word operations are signed
(16#7FFF > 16#8000).
DEC_W
EN ENO
In LAD and FBD: IN + 1 = OUT
IN - 1 = OUT
IN
In STL:
OUT
INCW
OUT
DECW
OUT
3
3
3
221
222
224
OUT + 1 = OUT
OUT - 1 = OUT
Error conditions that set ENO = 0: SM1.1 (overflow),
SM4.3 (run-time), 0006 (indirect address)
These instructions affect the following Special Memory
bits: SM1.0 (zero); SM1.1 (overflow); SM1.2 (negative)
Operands
Data Types
IN
VW, IW, QW, MW, SW, SMW, AC, AIW, LW, T, C, Constant, *VD,
*AC, *LD
INT
OUT
VW, IW, QW, MW, SW, SMW, LW, AC, T, C, *VD, *AC, *LD
INT
9-78
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Increment Double Word and Decrement Double Word
L
A
D
INC_DW
ENO
EN
F
B
D
IN
S
T
L
OUT
The Increment Double Word and Decrement Double
Word instructions add or subtract 1 to or from the input
double word (IN) and place the result in OUT.
In LAD and FBD: IN + 1 = OUT
IN - 1 = OUT
DEC_DW
EN ENO
Increment and decrement double word operations are
signed (16#7FFFFFFF > 16#80000000).
IN
In STL:
OUT
INCD
OUT
DECD
OUT
3
3
3
221
222
224
OUT + 1 = OUT
OUT - 1 = OUT
Error conditions that set ENO = 0: SM1.1 (overflow),
SM4.3 (run-time), 0006 (indirect address)
These instructions affect the following Special Memory
bits: SM1.0 (zero); SM1.1 (overflow); SM1.2 (negative)
Inputs/Outputs
Operands
Data Types
IN
VD, ID, QD, MD, SD, SMD, LD, AC, HC, Constant, *VD, *AC, *LD
DINT
OUT
VD, ID, QD, MD, SD, SMD, LD, AC, *VD, *AC, *LD
DINT
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-79
SIMATIC Instructions
Increment, Decrement Example
LAD
I4.0
STL
INC_W
EN ENO
AC0
IN
OUT
LD
INCW
DECD
I4.0
AC0
VD100
AC0
DEC_DW
EN ENO
VD100
IN
OUT
VD100
FBD
I4.0
AC0
DEC_DW
EN ENO
INC_W
EN ENO
IN
OUT
AC0
VD100
IN
OUT
VD100
Application
Increment Word
AC0
125
Decrement Double Word
VD100
increment
AC0
Figure 9-26
9-80
126
128000
decrement
VD100
127999
Example of Increment/Decrement Instructions for LAD, STL, and FBD
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
9.9
SIMATIC Real Math Instructions
Add Real, Subtract Real
L
A
D
EN
F
B
D
ADD_R
ENO
IN1 OUT
OUT
The Add Real and Subtract Real instructions add or
subtract two 32-bit real numbers and produce a 32-bit
real number result (OUT).
In LAD and FBD:
IN1 + IN2 = OUT
IN1 - IN2 = OUT
In STL:
IN1 + OUT = OUT
OUT - IN1 = OUT
IN2
SUB_R
EN
ENO
IN1 OUT
OUT
IN2
S
T
L
Error conditions that set ENO = 0: SM1.1 (overflow),
SM4.3 (run-time), 0006 (indirect address)
These instructions affect the following Special Memory
bits: SM1.0 (zero); SM1.1 (overflow); SM1.2 (negative)
+R
IN1, OUT
-R
IN1, OUT
3
3
3
221
222
224
SM1.1 is used to indicate overflow errors and illegal
values. If SM1.1 is set, then the status of SM1.0 and
SM1.2 is not valid and the original input operands are not
altered. If SM1.1 is not set, then the math operation has
completed with a valid result and SM1.0 and SM1.2
contain valid status.
Inputs/Outputs
Operands
Data Types
IN1, IN2
VD, ID, QD, MD, SD, SMD, AC, LD, Constant, *VD, *AC, *LD
REAL
OUT
VD, ID, QD, MD, SD, SMD, AC, LD, *VD, *AC, *LD
REAL
Note
Real or floating-point numbers are represented in the format described in the
ANSI/IEEE 754-1985 standard (single-precision). Refer to the standard for more
information.
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-81
SIMATIC Instructions
Multiply Real, Divide Real
L
A
D
MUL_R
EN
ENO
F
B
D
IN1 OUT
OUT
IN2
The Multiply Real instruction multiplies two 32-bit real
numbers, and produces a 32-bit real number result
(OUT).
The Divide Real instruction divides two 32-bit real
numbers, and produces a 32-bit real number quotient.
In LAD and FBD:
IN1<IN2 = OUT
IN1/ IN2 = OUT
In STL:
IN1<OUT = OUT
OUT / IN1 = OUT
DIV_R
EN
ENO
IN1 OUT
OUT
IN2
S
T
L
Error conditions that set ENO = 0: SM1.1 (overflow),
SM1.3 (divide-by-zero), SM4.3 (run-time), 0006 (indirect
address)
*R
IN1, OUT
/R
IN1, OUT
3
3
3
221
222
224
These instructions affect the following Special Memory
bits: SM1.0 (zero); SM1.1 (overflow or illegal value
generated during the operation or illegal input parameter
found); SM1.2 (negative); SM1.3 (divide-by-zero)
If SM1.3 is set during a divide operation, then the other math status bits are left
unchanged and the original input operands are not altered. SM1.1 is used to
indicate overflow errors and illegal values. If SM1.1 is set, then the status of SM1.0
and SM1.2 is not valid and the original input operands are not altered. If SM1.1
and SM1.3 (during a divide operation) are not set, then the math operation has
completed with a valid result and SM1.0 and SM1.2 contain valid status.
Inputs/Outputs
Operands
Data Types
IN1, IN2
VD, ID, QD, MD, SMD, SD, LD, AC, Constant, *VD, *AC, *LD
REAL
OUT
VD, ID, QD, MD, SMD, SD, LD, AC, *VD, *AC, *LD
REAL
Note
Real or floating-point numbers are represented in the format described in the
ANSI/IEEE 754-1985 standard (single-precision). Refer to the standard for more
information.
9-82
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Math Examples
LAD
Network 1
I0.0
EN
STL
NETWORK 1
LD
I0.0
+R
AC1, AC0
*R
AC1, VD100
/R
VD10, VD200
ADD_R
ENO
AC1
IN1 OUT
OUT
AC0
IN2
AC0
MUL_R
EN
ENO
AC1
VD100
IN1 OUT
OUT
VD100
IN2
DIV_R
EN
ENO
VD100
VD10
OUT
IN1 OUT
VD200
IN2
FBD
Network 1
I0.0
EN
MUL_R
EN
ENO
ADD_R
ENO
AC1
IN1 OUT
OUT
AC0
IN2
AC0
AC1
VD100
DIV_R
EN
ENO
IN1 OUT
OUT
VD100
VD100
VD10
IN2
IN1 OUT
OUT
VD200
IN2
Application
Add
AC1
4000.0
Multiply
AC1 400.00
plus
AC0
6000.0
Figure 9-27
4000.0
VD200
multiplied by
VD100
200.0
VD100
800000.0
equals
AC0 10000.0
Divide
divided by
VD10
equals
41.0
equals
VD200
97.5609
Examples of Real Math Instructions for LAD, STL, and FBD
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-83
SIMATIC Instructions
PID Loop
L
A
D
PID
EN
ENO
F
B
D
TBL
LOOP
The PID Loop instruction executes a PID loop
calculation on the referenced LOOP based on the input
and configuration information in Table (TBL).
Error conditions that set ENO = 0: SM1.1 (overflow),
SM4.3 (run-time), 0006 (indirect address)
This instruction affects the following Special Memory bits:
SM1.1 (overflow)
S
T
L
PID TBL, LOOP
3
3
3
221
222
224
Inputs/Outputs
Operands
Data Types
TBL
VB
BYTE
LOOP
Constant (0 to 7)
BYTE
The PID loop instruction (Proportional, Integral, Derivative Loop) is provided to
perform the PID calculation. The top of the logic stack (TOS) must be ON (power
flow) to enable the PID calculation. The instruction has two operands: a TABLE
address which is the starting address of the loop table and a LOOP number which
is a constant from 0 to 7. Eight PID instructions can be used in a program. If two or
more PID instructions are used with the same loop number (even if they have
different table addresses), the PID calculations will interfere with one another and
the output will be unpredictable.
The loop table stores nine parameters used for controlling and monitoring the loop
operation and includes the current and previous value of the process variable, the
setpoint, output, gain, sample time, integral time (reset), derivative time (rate), and
the integral sum (bias).
To perform the PID calculation at the desired sample rate, the PID instruction must
be executed either from within a timed interrupt routine or from within the main
program at a rate controlled by a timer. The sample time must be supplied as an
input to the PID instruction via the loop table.
Using the PID Wizard in STEP 7-Micro/WIN 32
STEP 7-Micro/WIN 32 offers the PID Wizard to guide you in defining a PID
algorithm for a closed-loop control process. Select the menu command
Tools Instruction Wizard, and then select PID from the Instruction Wizard
window.
9-84
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
PID Algorithm
In steady state operation, a PID controller regulates the value of the output so as
to drive the error (e) to zero. A measure of the error is given by the difference
between the setpoint (SP) (the desired operating point) and the process variable
(PV) (the actual operating point). The principle of PID control is based upon the
following equation that expresses the output, M(t), as a function of a proportional
term, an integral term, and a differential term:
ÁÁÁÁ
ÁÁ
ÁÁÁÁÁÁ
ÁÁÁ
ÁÁÁÁÁÁÁ
ÁÁ
ÁÁÁÁÁÁ
ÁÁÁÁ
ÁÁ
ÁÁÁÁÁÁ
ÁÁÁ
ÁÁÁÁÁÁÁ
ÁÁ
ÁÁÁÁÁÁ
ŕ
ÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁ
ÁÁÁÁÁÁÁ
ÁÁÁÁÁÁ
ÁÁ
ÁÁÁÁÁÁ
ÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁ
ÁÁ
Á
ÁÁÁÁÁ
Á
ÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
t
M(t)
=
KC * e
+
K C e dt ) M initial
+
KC * de/dt
+
differential term
0
output
=
proportional term
+
integral term
where:
M(t)
KC
e
Minitial
is the loop output as a function of time
is the loop gain
is the loop error (the difference between setpoint and process
variable)
is the initial value of the loop output
In order to implement this control function in a digital computer, the continuous
function must be quantized into periodic samples of the error value with
subsequent calculation of the output. The corresponding equation that is the basis
for the digital computer solution is:
ÁÁÁÁ
ÁÁ
ÁÁÁÁÁÁ
ÁÁ
ÁÁÁÁÁÁÁÁ
ÁÁ
ÁÁÁÁÁÁ
ȍ
ÁÁÁÁ
ÁÁ
ÁÁÁÁÁÁ
ÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
ÁÁ
ÁÁÁÁÁÁ
Á
ÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Mn
=
KC < en
+
KI <
n
) M initial
+
K D < (e n–e n–1)
1
output
=
proportional term
+
integral term
+
differential term
where:
Mn
KC
en
en - 1
KI
Minitial
KD
is the calculated value of the loop output at sample time n
is the loop gain
is the value of the loop error at sample time n
is the previous value of the loop error (at sample time n - 1)
is the proportional constant of the integral term
is the initial value of the loop output
is the proportional constant of the differential term
From this equation, the integral term is shown to be a function of all the error terms
from the first sample to the current sample. The differential term is a function of the
current sample and the previous sample, while the proportional term is only a
function of the current sample. In a digital computer it is not practical to store all
samples of the error term, nor is it necessary.
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-85
SIMATIC Instructions
Since the digital computer must calculate the output value each time the error is
sampled beginning with the first sample, it is only necessary to store the previous
value of the error and the previous value of the integral term. As a result of the
repetitive nature of the digital computer solution, a simplification in the equation
that must be solved at any sample time can be made. The simplified equation is:
ÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁ
ÁÁÁ
ÁÁÁÁÁÁ
ÁÁ
ÁÁÁÁÁÁÁÁ
ÁÁ
ÁÁÁÁÁÁ
ÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Mn
=
KC < en
+
K I < e n ) MX
+
K D < (e n–e n–1)
output
=
proportional term
+
integral term
+
differential term
where:
Mn
KC
en
en - 1
KI
MX
KD
is the calculated value of the loop output at sample time n
is the loop gain
is the value of the loop error at sample time n
is the previous value of the loop error (at sample time n - 1)
is the proportional constant of the integral term
is the previous value of the integral term (at sample time n - 1)
is the proportional constant of the differential term
The CPU uses a modified form of the above simplified equation when calculating
the loop output value. This modified equation is:
ÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁ
ÁÁ
ÁÁÁÁÁÁÁ
ÁÁÁ
ÁÁÁÁÁÁÁ
ÁÁ
ÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Mn
=
MPn
+
MIn
+
MDn
output
=
proportional term
+
integral term
+
differential term
where:
Mn
MPn
MIn
MDn
9-86
is the calculated value of the loop output at sample time n
is the value of the proportional term of the loop output at sample time
n
is the value of the integral term of the loop output at sample time n
is the value of the differential term of the loop output at sample time n
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Proportional Term
The proportional term MP is the product of the gain (KC), which controls the
sensitivity of the output calculation, and the error (e), which is the difference
between the setpoint (SP) and the process variable (PV) at a given sample time.
The equation for the proportional term as solved by the CPU is:
MPn
=
KC * (SPn - PVn)
where:
is the value of the proportional term of the loop output at sample time
n
is the loop gain
is the value of the setpoint at sample time n
is the value of the process variable at sample time n
MPn
KC
SPn
PVn
Integral Term
The integral term MI is proportional to the sum of the error over time. The equation
for the integral term as solved by the CPU is:
MIn
=
KC * TS / TI * (SPn - PVn) + MX
where:
MIn
KC
TS
TI
SPn
PVn
MX
is the value of the integral term of the loop output at sample time n
is the loop gain
is the loop sample time
is the integration period of the loop (also called the integral time or reset)
is the value of the setpoint at sample time n
is the value of the process variable at sample time n
is the value of the integral term at sample time n - 1 (also called the
integral sum or the bias)
The integral sum or bias (MX) is the running sum of all previous values of the
integral term. After each calculation of MIn, the bias is updated with the value of
MIn which may be adjusted or clamped (see the section “Variables and Ranges” for
details). The initial value of the bias is typically set to the output value (Minitial) just
prior to the first loop output calculation. Several constants are also part of the
integral term, the gain (KC), the sample time (TS), which is the cycle time at which
the PID loop recalculates the output value, and the integral time or reset (TI), which
is a time used to control the influence of the integral term in the output calculation.
S7-200 Programmable Controller System Manual
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9-87
SIMATIC Instructions
Differential Term
The differential term MD is proportional to the change in the error. The equation for
the differential term:
MDn
=
KC * TD / TS * ((SPn - PVn) - (SPn - 1 - PVn - 1))
To avoid step changes or bumps in the output due to derivative action on setpoint
changes, this equation is modified to assume that the setpoint is a constant (SPn =
SPn - 1). This results in the calculation of the change in the process variable instead
of the change in the error as shown:
MDn
=
KC * TD / TS * (SPn - PVn - SPn + PVn - 1)
=
KC * TD / TS * (PVn - 1 - PVn)
or just:
MDn
where:
MDn
KC
TS
TD
SPn
SPn - 1
PVn
PVn - 1
is the value of the differential term of the loop output at sample time n
is the loop gain
is the loop sample time
is the differentiation period of the loop (also called the derivative time
or rate)
is the value of the setpoint at sample time n
is the value of the setpoint at sample time n - 1
is the value of the process variable at sample time n
is the value of the process variable at sample time n - 1
The process variable rather than the error must be saved for use in the next
calculation of the differential term. At the time of the first sample, the value of
PVn - 1 is initialized to be equal to PVn.
Selection of Loop Control
In many control systems it may be necessary to employ only one or two methods
of loop control. For example only proportional control or proportional and integral
control may be required. The selection of the type of loop control desired is made
by setting the value of the constant parameters.
If you do not want integral action (no “I” in the PID calculation), then a value of
infinity should be specified for the integral time (reset). Even with no integral action,
the value of the integral term may not be zero, due to the initial value of the integral
sum MX.
If you do not want derivative action (no “D” in the PID calculation), then a value of
0.0 should be specified for the derivative time (rate).
If you do not want proportional action (no “P” in the PID calculation) and you want I
or ID control, then a value of 0.0 should be specified for the gain. Since the loop
gain is a factor in the equations for calculating the integral and differential terms,
setting a value of 0.0 for the loop gain will result in a value of 1.0 being used for the
loop gain in the calculation of the integral and differential terms.
9-88
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Converting and Normalizing the Loop Inputs
A loop has two input variables, the setpoint and the process variable. The setpoint
is generally a fixed value such as the speed setting on the cruise control in your
automobile. The process variable is a value that is related to loop output and
therefore measures the effect that the loop output has on the controlled system. In
the example of the cruise control, the process variable would be a tachometer
input that measures the rotational speed of the tires.
Both the setpoint and the process variable are real world values whose magnitude,
range, and engineering units may be different. Before these real world values can
be operated upon by the PID instruction, the values must be converted to
normalized, floating-point representations.
The first step is to convert the real world value from a 16-bit integer value to a
floating-point or real number value. The following instruction sequence is provided
to show how to convert from an integer value to a real number.
XORD
MOVW
LDW>=
JMP
NOT
ORD
LBL
DTR
AC0, AC0
AIW0, AC0
AC0, 0
0
//Clear the accumulator.
//Save the analog value in the accumulator.
//If the analog value is positive,
//then convert to a real number.
//Else,
16#FFFF0000, AC0 //sign extend the value in AC0.
0
AC0, AC0
//Convert the 32-bit integer to a real number.
The next step is to convert the real number value representation of the real world
value to a normalized value between 0.0 and 1.0. The following equation is used to
normalize either the setpoint or process variable value:
RNorm = (RRaw / Span) + Offset)
where:
RNorm
RRaw
is the normalized, real number value representation of the real world
value
is the un-normalized or raw, real number value representation of the
real world value
Offset
is 0.0 for unipolar values
is 0.5 for bipolar values
Span
is the maximum possible value minus the minimum possible value
= 32,000 for unipolar values (typical)
= 64,000 for bipolar values (typical)
The following instruction sequence shows how to normalize the bipolar value in
AC0 (whose span is 64,000) as a continuation of the previous instruction
sequence:
/R
+R
MOVR
64000.0, AC0
0.5, AC0
AC0, VD100
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
//Normalize the value in the accumulator
//Offset the value to the range from 0.0 to 1.0
//Store the normalized value in the loop TABLE
9-89
SIMATIC Instructions
Converting the Loop Output to a Scaled Integer Value
The loop output is the control variable, such as the throttle setting in the example
of the cruise control on the automobile. The loop output is a normalized, real
number value between 0.0 and 1.0. Before the loop output can be used to drive an
analog output, the loop output must be converted to a 16-bit, scaled integer value.
This process is the reverse of converting the PV and SP to a normalized value.
The first step is to convert the loop output to a scaled, real number value using the
formula given below:
RScal = (Mn - Offset) * Span
where:
RScal
Mn
is the scaled, real number value of the loop output
is the normalized, real number value of the loop output
Offset
is 0.0 for unipolar values
is 0.5 for bipolar values
Span
is the maximum possible value minus the minimum possible value
= 32,000 for unipolar values (typical)
= 64,000 for bipolar values (typical)
The following instruction sequence shows how to scale the loop output:
MOVR
-R
VD108, AC0
0.5, AC0
*R
64000.0, AC0
//Move the loop output to the accumulator.
//Include this statement only if the value is
//bipolar.
//Scale the value in the accumulator.
Next, the scaled, real number value representing the loop output must be
converted to a 16-bit integer. The following instruction sequence shows how to do
this conversion:
ROUND AC0 AC0
MOVW AC0, AQW0
//Convert the real number to a 32-bit integer.
//Write the 16-bit integer value to the analog
//output.
Forward- or Reverse-Acting Loops
The loop is forward-acting if the gain is positive and reverse-acting if the gain is
negative. (For I or ID control, where the gain value is 0.0, specifying positive
values for integral and derivative time will result in a forward-acting loop, and
specifying negative values will result in a reverse-acting loop.)
9-90
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Variables and Ranges
The process variable and setpoint are inputs to the PID calculation. Therefore the
loop table fields for these variables are read but not altered by the PID instruction.
The output value is generated by the PID calculation, so the output value field in
the loop table is updated at the completion of each PID calculation. The output
value is clamped between 0.0 and 1.0. The output value field can be used as an
input by the user to specify an initial output value when making the transition from
manual control to PID instruction (auto) control of the output (see discussion in the
Modes section below).
If integral control is being used, then the bias value is updated by the PID
calculation and the updated value is used as an input in the next PID calculation.
When the calculated output value goes out of range (output would be less than 0.0
or greater than 1.0), the bias is adjusted according to the following formulas:
MX = 1.0 - (MPn + MDn)
when the calculated output, Mn > 1.0
MX = - (MPn + MDn)
when the calculated output, Mn < 0.0
or
where:
MX
MPn
MDn
Mn
is the value of the adjusted bias
is the value of the proportional term of the loop output at sample time n
is the value of the differential term of the loop output at sample time n
is the value of the loop output at sample time n
By adjusting the bias as described, an improvement in system responsiveness is
achieved once the calculated output comes back into the proper range. The
calculated bias is also clamped between 0.0 and 1.0 and then is written to the bias
field of the loop table at the completion of each PID calculation. The value stored in
the loop table is used in the next PID calculation.
The bias value in the loop table can be modified by the user prior to execution of
the PID instruction in order to address bias value problems in certain application
situations. Care must be taken when manually adjusting the bias, and any bias
value written into the loop table must be a real number between 0.0 and 1.0.
A comparison value of the process variable is maintained in the loop table for use
in the derivative action part of the PID calculation. You should not modify this
value.
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-91
SIMATIC Instructions
Modes
There is no built-in mode control for S7-200 PID loops. The PID calculation is
performed only when power flows to the PID box. Therefore, “automatic” or “auto”
mode exists when the PID calculation is performed cyclically. “Manual” mode exists
when the PID calculation is not performed.
The PID instruction has a power-flow history bit, similar to a counter instruction.
The instruction uses this history bit to detect a 0-to-1 power flow transition, which
when detected will cause the instruction to perform a series of actions to provide a
bumpless change from manual control to auto control. In order for change to auto
mode control to be bumpless, the value of the output as set by the manual control
must be supplied as an input to the PID instruction (written to the loop table entry
for Mn) before switching to auto control. The PID instruction performs the following
actions to values in the loop table to ensure a bumpless change from manual to
auto control when a 0-to-1 power flow transition is detected:
Sets setpoint (SPn) = process variable (PVn)
Sets old process variable (PVn-1) = process variable (PVn)
Sets bias (MX) = output value (Mn)
The default state of the PID history bits is “set” and that state is established at
CPU startup and on every STOP-to-RUN mode transition of the controller. If power
flows to the PID box the first time that it is executed after entering RUN mode, then
no power flow transition is detected and the bumpless mode change actions will
not be performed.
Alarm Checking and Special Operations
The PID instruction is a simple but powerful instruction that performs the PID
calculation. If other processing is required such as alarm checking or special
calculations on loop variables, these must be implemented using the basic
instructions supported by the CPU.
9-92
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Error Conditions
When it is time to compile, the CPU will generate a compile error (range error) and
the compilation will fail if the loop table start address or PID loop number operands
specified in the instruction are out of range.
Certain loop table input values are not range checked by the PID instruction. You
must take care to ensure that the process variable and setpoint (as well as the bias
and previous process variable if used as inputs) are real numbers between 0.0 and
1.0.
If any error is encountered while performing the mathematical operations of the
PID calculation, then SM1.1 (overflow or illegal value) will be set and execution of
the PID instruction will be terminated. (Update of the output values in the loop table
may be incomplete, so you should disregard these values and correct the input
value causing the mathematical error before the next execution of the loop’s PID
instruction.)
Loop Table
The loop table is 36 bytes long and has the format shown in Table 9-19.
Table 9-19 Format of the Loop Table
Offset
Field
Format
0
Process variable
(PVn)
Double word - real
in
Contains the process variable, which must be
scaled between 0.0 and 1.0.
4
Setpoint
(SPn)
Double word - real
in
Contains the setpoint, which must be scaled
between 0.0 and 1.0.
8
Output
(Mn)
Double word - real
in/out
Contains the calculated output, scaled between
0.0 and 1.0.
12
Gain
(KC)
Double word - real
in
Contains the gain, which is a proportional
constant. Can be a positive or negative number.
16
Sample time
(TS)
Double word - real
in
Contains the sample time, in seconds. Must be
a positive number.
20
Integral time or
reset (TI)
Double word - real
in
Contains the integral time or reset, in minutes.
Must be a positive number.
24
Derivative time
or rate (TD)
Double word - real
in
Contains the derivative time or rate, in minutes.
Must be a positive number.
28
Bias
(MX)
Double word - real
in/out
Contains the bias or integral sum value
between 0.0 and 1.0.
32
Previous
process variable
(PVn-1)
Double word - real
in/out
Contains the previous value of the process
variable stored from the last execution of the
PID instruction.
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Type
Description
9-93
SIMATIC Instructions
PID Program Example
In this example, a water tank is used to maintain a constant water pressure. Water
is continuously being taken from the water tank at a varying rate. A variable speed
pump is used to add water to the tank at a rate that will maintain adequate water
pressure and also keep the tank from being emptied.
The setpoint for this system is a water level setting that is equivalent to the tank
being 75% full. The process variable is supplied by a float gauge that provides an
equivalent reading of how full the tank is and which can vary from 0% or empty to
100% or completely full. The output is a value of pump speed that allows the pump
to run from 0% to 100% of maximum speed.
The setpoint is predetermined and will be entered directly into the loop table. The
process variable will be supplied as a unipolar, analog value from the float gauge.
The loop output will be written to a unipolar, analog output which is used to control
the pump speed. The span of both the analog input and analog output is 32,000.
Only proportional and integral control will be employed in this example. The loop
gain and time constants have been determined from engineering calculations and
may be adjusted as required to achieve optimum control. The calculated values of
the time constants are:
KC is 0.25
TS is 0.1 seconds
TI is 30 minutes
The pump speed will be controlled manually until the water tank is 75% full, then
the valve will be opened to allow water to be drained from the tank. At the same
time, the pump will be switched from manual to auto control mode. A digital input
will be used to switch the control from manual to auto. This input is described
below:
I0.0 is manual/auto control; 0 is manual, 1 is auto
While in manual control mode, the pump speed will be written by the operator to
VD108 as a real number value from 0.0 to 1.0.
Figure 9-28 shows the control program for this application.
9-94
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
LAD
STL
MAIN OB1
Network 1
SM0.1
Network 1
LD
SM0.1
CALL 0
SBR0
EN
//On the first scan call
//the initialization
//subroutine.
SUBROUTINE 0
Network 1
EN
MOV_R
ENO
0.75 IN
OUT
SM0.0
VD104
MOV_R
EN ENO
0.25 IN
OUT
VD112
MOV_R
EN ENO
0.10 IN
OUT
EN
MOV_R
ENO
30.0 IN
OUT
VD116
VD120
Network 1
LD
SM0.0
MOVR 0.75, VD104 //Load the loop setpoint.
// = 75% full.
MOVR 0.25, VD112 //Load the loop gain=0.25.
MOVR 0.10, VD116 //Load the loop sample
//time = 0.1 seconds.
MOVR 30.0, VD120 //Load the integral time
//= 30 minutes.
//
MOVR 0.0, VD124 //Set no derivative action.
MOVB 100, SMB34 //Set time interval
//(100 ms) for timed
//interrupt 0.
ATCH 0, 10
//Set up a timed
//interrupt to invoke
//PID execution.
ENI
//Enable interrupts.
MOV_R
EN ENO
0.0 IN
OUT
VD124
MOV_B
EN ENO
100 IN
OUT
SMB34
ATCH
EN ENO
0 INT
10 EVNT
ENI
//End of subroutine 0
Figure 9-28
Example of PID Loop Control
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-95
SIMATIC Instructions
LAD
INTERRUPT 0
Network 1
SM0.0
I_DI
EN ENO
AIW0
IN
OUT
STL
NETWORK 1
AC0
DI_R
EN ENO
AC0
IN
OUT
AC0
DIV_R
EN ENO
AC0
IN1
32000
IN2
OUT
//Convert PV to a
//normalized real
//number value - PV is
//a unipolar input and
//cannot be negative.
AC0
LD
SM0.0
ITD
AIW0, AC0
//Save the unipolar
//analog value in
//the accumulator.
DTR
AC0, AC0
//Convert the 32-bit
//integer to a real
//number.
/R
32000.0, AC0 //Normalize the value
//in the
//accumulator.
MOVR AC0, VD100
//Store the normalized
//PV in the loop TABLE.
MOV_R
EN ENO
AC0
IN
OUT
VD100
NETWORK 2
Network 2
I0.0
EN
VB100
PID
ENO
VB100, 0
//Convert Mn to a scaled,
//sixteen-bit integer.
//Mn is a unipolar value
//and cannot be negative.
IN1 OUT
OUT
LD
SM0.0
MOVR VD108, AC
AC0
32000 IN2
ROUND
EN
ENO
AC0
PID
NETWORK 3
MUL_R
EN ENO
VD108
I0.0
TBL
0 LOOP
Network 3
SM0.0
LD
//Execute the loop when
//placed in auto mode.
//When auto mode is
//entered,
//invoke PID execution.
IN
OUT
AC0
//Move the loop output
//to the accumulator.
*R
32000.0, AC0 //Scale the value in
//the accumulator.
ROUND AC0, AC0
//Convert the real
//number value to
//a 32-bit integer.
DTI
AC0, AQW0
//Write the 16-bit
//integer value to
//the analog output.
DI_I
EN ENO
AC0
IN
OUT
//end of Interrupt
Routine 0
AQW0
Figure 9-28 Example of PID Loop Control (continued)
9-96
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
FBD
MAIN OB1
Network 1
SBR0
SM0.1 EN
SUBROUTINE 0
SM0.0
0.75
MOV_R
EN
ENO
IN
OUT
MOV_R
EN
ENO
0.25 IN
VD104
MOV_R
EN
ENO
IN
30.0
0
10
OUT
OUT
MOV_R
EN
ENO
VD112
MOV_R
EN
ENO
VD120
0.0 IN
ATCH
EN
ENO
INT
OUT
0.10
IN
OUT
VD116
MOV_B
EN
ENO
VD124
100 IN
OUT
SMB34
ENI
EVNT
INTERRUPT 0
Network 1
I_DI
SM0.0 EN
ENO
AIW0
IN
OUT
DI_R
EN
ENO
AC0 AC0 IN
OUT
DIV_R
EN
ENO
OUT
AC0 AC0 IN1 OUT
MOV_R
EN ENO
AC0 AC0 IN
OUT
VD100
32000 IN2
Network 2
I0.0
VB100
0
PID
EN
ENO
TBL
LOOP
Network 3
SM0.0
MUL_R
ENO
EN
VB108
IN1 OUT
OUT
32000
IN2
ROUND
EN
ENO
AC0
AC0 IN
OUT
DI_I
EN
ENO
AC0
AC0 IN
OUT
AQW0
Figure 9-28 Example of PID Loop Control (continued)
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-97
SIMATIC Instructions
Square Root
L
A
D
L
A
D
F
B
D
S
T
L
SQRT
EN ENO
The Square Root instruction takes the square root of a
32-bit real number (IN) and produces a 32-bit real
number result (OUT) as shown in the equation:
IN
√ IN = OUT
SQRT
3
221
3
222
OUT
IN, OUT
3
Error conditions that set ENO = 0: SM1.1 (overflow),
SM4.3 (run-time), 0006 (indirect address)
This instruction affects the following Special Memory bits:
SM1.0 (zero); SM1.1 (overflow); SM1.2 (negative).
224
SM1.1 is used to indicate overflow errors and illegal values. If SM1.1 is set, then
the status of SM1.0 and SM1.2 is not valid and the original input operands are not
altered. If SM1.1 is not set, then the math operation has completed with a valid
result and SM1.0 and SM1.2 contain valid status.
Inputs/Outputs
Operands
Data Types
IN
VD, ID, QD, MD, SMD, SD, LD, AC, Constant, *VD, *AC, *LD
REAL
OUT
VD, ID, QD, MD, SMD, SD, LD,AC, *VD, *AC, *LD
REAL
9-98
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
9.10
SIMATIC Move Instructions
Move Byte, Move Word, Move Double Word, Move Real
L
A
D
The Move Byte instruction moves the input byte (IN) to
the output byte (OUT). The input byte is not altered by
the move.
MOV_B
EN ENO
F
B
D
IN
OUT
The Move Word instruction moves the input word (IN) to
the output word (OUT). The input word is not altered by
the move.
MOV_W
EN ENO
IN
The Move Double Word instruction moves the input
double word (IN) to the output double word (OUT). The
input double word is not altered by the move.
OUT
MOV_DW
EN ENO
IN
The Move Real instruction moves a 32-bit, real input
double word (IN) to the output double word (OUT). The
input double word is not altered by the move.
OUT
MOV_R
EN ENO
IN
S
T
L
Move...
MOVB
MOVW
MOVD
MOVR
OUT
IN, OUT
IN, OUT
IN, OUT
IN, OUT
3
3
3
221
222
224
Inputs/Outputs
Operands
Data Types
IN
VB, IB, QB, MB, SB, SMB, LB, AC, Constant, *VD,
*AC, *LD
BYTE
OUT
VB, IB, QB, MB, SB, SMB, LB, AC, *VD, *AC, *LD
BYTE
IN
VW, IW, QW, MW, SW, SMW, LW, T, C, AIW,
Constant, AC *VD, *AC, *LD
WORD, INT
OUT
VW, T, C, IW, QW, SW, MW, SMW, LW, AC, AQW,
*VD, *AC, *LD
WORD, INT
IN
VD, ID, QD, MD, SD, SMD, LD, HC, &VB, &IB, &QB,
&MB, &SB, &T, &C, AC, Constant, *VD, *AC, *LD
DWORD, DINT
OUT
VD, ID, QD, MD, SD, SMD, LD, AC, *VD, *AC, *LD
DWORD, DINT
IN
VD, ID, QD, MD, SD, SMD, LD, AC, Constant, *VD,
*AC, *LD
REAL
OUT
VD, ID, QD, MD, SD, SMD, LD, AC, *VD, *AC, *LD
REAL
Byte
Word
Error conditions that set ENO = 0: SM4.3 (run-time),
0006 (indirect address)
Double Word
Real
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-99
SIMATIC Instructions
Block Move Byte, Block Move Word, Block Move Double Word
L
A
D
BLKMOV_B
EN
ENO
F
B
D
IN
The Block Move Byte instruction moves the number of
bytes (N) from the input address IN to the output address
OUT. N has a range of 1 to 255.
The Block Move Word instruction moves the number of
words (N), from the input address IN to the output
address OUT. N has a range of 1 to 255.
OUT
N
BLKMOV_W
ENO
EN
IN
The Block Move Double Word instruction moves the
number of double words (N), from the input address IN,
to the output address OUT. N has a range of 1 to 255.
OUT
Error conditions that set ENO = 0: SM4.3 (run-time),
0006 (indirect address), 0091 (operand out of range)
N
BLKMOV_DW
EN
ENO
IN
OUT
N
S
T
L
BMB IN, OUT, N
BMW IN, OUT, N
BMD IN, OUT, N
Block Move...
Byte
Word
Double Word
9-100
3
3
3
221
222
224
Inputs/Outputs
Operands
Data Types
IN, OUT
VB, IB, QB, MB,SB, SMB, LB, *VD, *AC, *LD
BYTE
N
VB, IB, QB, MB, SB, SMB, LB, AC, Constant, *VD,
*AC, *LD
BYTE
IN
VW, IW, QW, MW, SW, SMW, LW, T, C, AIW, *VD,
*AC, *LD
WORD
N
VB, IB, QB, MB, SB, SMB, LB, AC, Constant, *VD,
*AC, *LD
BYTE
OUT
VW, IW, QW, MW, SW, SMW, LW, T, C, AQW, *VD,
*LD, *AC
WORD
IN, OUT
VD, ID, QD, MD, SD, SMD, LD, *VD, *AC, *LD
DWORD
N
VB, IB, QB, MB, SB, SMB, LB, AC, Constant, *VD,
*AC, *LD
BYTE
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Block Move Example
LAD
STL
Move
Array 1 (VB20 to VB23) to
Array 2 (VB100 to VB103)
BLKMOV_B
EN
ENO
I2.1
VB20
4
IN
OUT
LD
BMB
I2.1
VB20, VB100, 4
VB100
N
FBD
BLKMOV_B
I2.1 EN
ENO
VB20 IN
OUT
4
VB100
N
Application
Array 1
VB20
30
VB21
31
VB22
32
VB23
33
block move
Array 2
Figure 9-29
VB100
30
VB101
31
VB102
32
VB103
33
Example of Block Move Instructions for LAD, STL, and FBD
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-101
SIMATIC Instructions
Swap Bytes
L
A
D
The Swap Bytes instruction exchanges the most
significant byte with the least significant byte of the word
(IN).
SWAP
EN
ENO
F
B
D
IN
S
T
L
SWAP
Error conditions that set ENO = 0: SM4.3 (run-time),
0006 (indirect address)
IN
3
3
3
221
222
224
Inputs/Outputs
IN
Operands
Data Types
VW, IW, QW, MW, SW, SMW, LW, T, C, AC, *VD, *AC, *LD
WORD
Move and Swap Examples
LAD
STL
LD
MOVB
SWAP
MOV_B
EN
ENO
I2.1
VB50
AC0
IN
OUT
EN
SWAP
ENO
I2.1
VB50, AC0
AC0
AC0
IN
FBD
I2.1
MOV_B
EN
ENO
VB50
IN
EN
OUT AC0
SWAP
ENO
AC0 IN
Application
Move
VB50
C3
Swap
AC0
move
AC0
Figure 9-30
9-102
C3
D6 C3
swap
AC0
C3 D6
Example of Move and Swap Instructions for LAD, STL, and FBD
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Memory Fill
L
A
D
FILL_N
EN
ENO
F
B
D
IN
The Memory Fill instruction fills memory starting at the
output word (OUT), with the word input pattern (IN) for
the number of words specified by N. N has a range of 1
to 255.
OUT
Error conditions that set ENO = 0: SM4.3 (run-time),
0006 (indirect address), 0091 (operand out of range)
N
S
T
L
FILL IN, OUT, N
3
3
3
221
222
224
Inputs/Outputs
Operands
Data Types
IN
VW, IW, QW, MW, SW, SMW, LW, AIW, T, C, AC, Constant, *VD,
*AC, *LD
WORD
N
VB, IB, QB, MB, SB, SMB, LB, AC, Constant, *VD, *AC, *LD
BYTE
OUT
VW, IW, QW, MW, SW, SMW, LW, T, C, AQW, *VD, *AC, *LD
WORD
Fill Example
LAD
FILL_N
EN
ENO
I2.1
0
IN
10
N
OUT
Clear VW200 to VW218
STL
LD
FILL
I2.1
0, VW200, 10
VW200
FBD
Application
FILL_N
ENO
I2.1 EN
0
fill
0 IN
10
Figure 9-31
OUT
VW200
N
VW200
0
VW202
...
0
VW218
0
Example of Fill Instructions for LAD, STL, and FBD
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-103
SIMATIC Instructions
9.11
SIMATIC Table Instructions
Add to Table
L
A
D
AD_T_TBL
EN
ENO
F
B
D
DATA
TBL
S
T
L
ATT DATA, TABLE
3
3
3
221
222
224
The Add To Table instruction adds word values (DATA)
to the table (TBL).
The first value of the table is the maximum table length
(TL). The second value is the entry count (EC), which
specifies the number of entries in the table. (See
Figure 9-32.) New data are added to the table after the
last entry. Each time new data are added to the table, the
entry count is incremented. A table may have up to 100
data entries.
Error conditions that set ENO = 0: SM1.4 (table
overflow), SM4.3 (run-time), 0006 (indirect address),
0091 (operand out of range)
This instruction affects the following Special Memory bits:
SM1.4 is set to 1 if you try to overfill the table.
Inputs/Outputs
Operands
Data Types
DATA
VW, IW, QW, MW, SW, SMW, LW, T, C, AIW, AC, Constant, *VD,
*AC, *LD
WORD
TBL
VW, IW, QW, MW, SW, SMW, LW, T, C, *VD, *AC, *LD
WORD
9-104
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Add to Table Example
LAD
STL
LD
ATT
AD_T_TBL
EN
ENO
I3.0
VW100
DATA
VW200
TBL
I3.0
VW100, VW200
FBD
I3.0
AD_T_TBL
EN
ENO
VW100 DATA
VW200 TBL
Application
Before execution of ATT
VW100
1234
VW200
VW202
VW204
VW206
VW208
VW210
VW212
VW214
0006
0002
5431
8942
xxxx
xxxx
xxxx
xxxx
Figure 9-32
TL (max. no. of entries)
EC (entry count)
d0 (data 0)
d1 (data 1)
After execution of ATT
VW200
VW202
VW204
VW206
VW208
VW210
VW212
VW214
0006
0003
5431
8942
1234
xxxx
xxxx
xxxx
TL (max. no. of entries)
EC (entry count)
d0 (data 0)
d1 (data 1)
d2 (data 2)
Example of Add To Table Instruction
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-105
SIMATIC Instructions
Table Find
L
A
D
TBL_FIND
EN
ENO
F
B
D
SRC
PTN
INDX
CMD
S
T
L
FND=
SRC, PATRN
INDX
FND<> SRC, PATRN,
INDX
FND<
SRC, PATRN,
INDX
FND>
SRC, PATRN,
INDX
3
3
3
221
222
224
Inputs/Outputs
The Table Find instruction searches the table (SRC),
starting with the table entry specified by INDX, for the
data value (PTN) that matches the search criteria defined
by CMD. The command parameter (CMD) is given a
numeric value of 1 to 4 that corresponds to =, <>, <, and
>, respectively.
If a match is found, the INDX points to the matching
entry in the table. To find the next matching entry, the
INDX must be incremented before invoking the Table
Find instruction again. If a match is not found, the INDX
has a value equal to the entry count.
A table may have up to 100 data entries. The data
entries (area to be searched) are numbered from 0 to a
maximum value of 99.
Error conditions that set ENO = 0: SM4.3 (run-time),
0006 (indirect address), 0091 (operand out of range)
Operands
Data Types
SRC
VW, IW, QW, MW, SMW, LW, T, C, *VD, *AC, *LD
WORD
PTN
VW, IW, QW, MW, SW, SMW, AIW, LW, T, C, AC, Constant, *VD,
*AC, *LD
INT
INDX
VW, IW, QW, MW, SW, SMW, LW, T, C, AC, *VD, *AC, *LD
WORD
CMD
Constant
BYTE
Note
When you use the Find instructions with tables generated with ATT, LIFO, and
FIFO instructions, the entry count and the data entries correspond directly. The
maximum-number-of-entries word required for ATT, LIFO, and FIFO is not
required by the Find instructions. Consequently, the SRC operand of a Find
instruction is one word address (two bytes) higher than the TBL operand of a
corresponding ATT, LIFO, or FIFO instruction, as shown in Figure 9-33.
Table format for ATT, LIFO, and FIFO
VW200
VW202
VW204
VW206
VW208
VW210
VW212
VW214
Figure 9-33
9-106
0006
0006
xxxx
xxxx
xxxx
xxxx
xxxx
xxxx
Table format for TBL_FIND
TL (max. no. of entries)
EC (entry count)
d0 (data 0)
d1 (data 1)
d2 (data 2)
d3 (data 3)
d4 (data 4)
d5 (data 5)
VW202
VW204
VW206
VW208
VW210
VW212
VW214
0006
xxxx
xxxx
xxxx
xxxx
xxxx
xxxx
EC (entry count)
d0 (data 0)
d1 (data 1)
d2 (data 2)
d3 (data 3)
d4 (data 4)
d5 (data 5)
Difference in Table Format between Find Instructions and ATT, LIFO, FIFO
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Table Find Example
LAD
STL
LD
FND=
I2.1
TBL_FIND
EN
ENO
VW202
16#3130
SRC
PTN
AC1
1
I2.1
VW202, 16#3130, AC1
FBD
When I2.1 is on,
search the table for a
value equal to
3130 HEX.
I2.1
VW202
INDX
16#3130
CMD
AC1
1
TBL_FIND
EN
ENO
SRC
PTN
INDX
CMD
Application
This is the table you are searching. If the table was created using ATT, LIFO, and FIFO instructions,
VW200 contains the maximum number of allowed entries and is not required by the Find instructions.
VW202
VW204
VW206
VW208
VW210
VW212
VW214
AC1
0
0006
3133
4142
3130
3030
3130
4541
EC (entry count)
d0 (data 0)
d1 (data 1)
d2 (data 2)
d3 (data 3)
d4 (data 4)
d5 (data 5)
AC1 must be set to 0 to search from the top of table.
Execute table search
AC1 contains the data entry number corresponding to the first
2
match found in the table (d2).
AC1
AC1
3
Increment the INDX by one, before searching the remaining
entries of the table.
Execute table search
AC1 contains the data entry number corresponding to the second
4
match found in the table (d4).
AC1
AC1
5
Increment the INDX by one, before searching the remaining entries
of the table.
Execute table search
AC1 contains a value equal to the entry count. The entire table has
6
been searched without finding another match.
AC1
AC1
Figure 9-34
0
Before the table can be searched again, the INDX value must be
reset to 0.
Example of Find Instructions for LAD, STL, and FBD
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-107
SIMATIC Instructions
First-In-First-Out
L
A
D
The First-In-First-Out instruction removes the first entry
in the table (TBL), and outputs the value to a specified
location (DATA). All other entries of the table are shifted
up one location. The entry count in the table is
decremented for each instruction execution.
FIFO
ENO
OUT
TBL DATA
EN
F
B
D
S
T
L
Error conditions that set ENO = 0: SM1.5 (empty table),
SM4.3 (run-time), 0006 (indirect address), 0091 (operand
out of range)
FIFO TABLE, DATA
3
3
3
221
222
224
This instruction affects the following Special Memory bits:
SM1.5 is set to 1 if you try to remove an entry from an
empty table.
Inputs/Outputs
Operands
Data Types
TABLE
VW, IW, QW, MW, SW, SMW, LW, T, C,*VD, *AC, *LD
WORD
DATA
VW, IW, QW, MW, SW, SMW, LW, AC, AQW, T, C, *VD, *AC, *LD
WORD
First-In-First-Out Example
LAD
I4.1
STL
FIFO
EN
ENO
VW200
TBL DATA
LD
FIFO
I4.1
VW200, VW400
VW400
FBD
I4.1 EN
VW200
FIFO
ENO
TBL
DATA
VW400
Application
Before execution of FIFO
VW200
VW202
VW204
VW206
VW208
VW210
VW212
VW214
Figure 9-35
9-108
0006
0003
5431
8942
1234
xxxx
xxxx
xxxx
TL (max. no. of entries)
EC (entry count)
d0 (data 0)
d1 (data 1)
d2 (data 2)
After execution of FIFO
VW400
5431
VW200
VW202
VW204
VW206
VW208
VW210
VW212
VW214
0006
0002
8942
1234
xxxx
xxxx
xxxx
xxxx
TL (max. no. of entries)
EC (entry count)
d0 (data 0)
d1 (data 1)
Example of First-In-First-Out Instruction
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Last-In-First-Out
L
A
D
LIFO
EN
ENO
F
B
D
OUT
DATA
TBL
The Last-In-First-Out instruction removes the last entry
in the table (TBL), and outputs the value to a location
specified by DATA. The entry count in the table is
decremented for each instruction execution.
Error conditions that set ENO = 0: SM1.5 (empty table),
SM4.3 (run-time), 0006 (indirect address), 0091 (operand
out of range)
S
T
L
LIFO TABLE, DATA
3
3
3
221
222
224
This instruction affects the following Special Memory bits:
SM1.5 is set to 1 if you try to remove an entry from an
empty table.
Inputs/Outputs
Operands
Data Types
TABLE
VW, IW, QW, MW, SW, SMW, LW, T, C,*VD, *AC, *LD
WORD
DATA
VW, IW, QW, MW, SW, SMW, LW, AQW, T, C, AC, *VD, *AC, *LD
WORD
Last-In-First-Out Example
LAD
I4.0
STL
LD
LIFO
LIFO
EN
ENO
VW200 TBL DATA
I4.0
VW200, VW300
FBD
VW300
I4.0
VW200
EN
LIFO
ENO
TBL DATA
VW300
Application
Before execution of LIFO
VW200
VW202
VW204
VW206
VW208
VW210
VW212
VW214
Figure 9-36
0006
0003
5431
8942
1234
xxxx
xxxx
xxxx
TL (max. no. of entries)
EC (entry count)
d0 (data 0)
d1 (data 1)
d2 (data 2)
After execution of LIFO
VW300
1234
VW200
VW202
VW204
VW206
VW208
VW210
VW212
VW214
0006
0002
5431
8942
xxxx
xxxx
xxxx
xxxx
TL (max. no. of entries)
EC (entry count)
d0 (data 0)
d1 (data 1)
Example of Last-In-First-Out Instruction
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-109
SIMATIC Instructions
9.12
SIMATIC Logical Operations Instructions
And Byte, Or Byte, Exclusive Or Byte
L
A
D
WAND_B
EN
ENO
F
B
D
IN1 OUT
IN2
WOR_B
EN
ENO
IN1 OUT
The And Byte instruction ANDs the corresponding bits of
two input bytes and loads the result (OUT) in a byte.
The Or Byte instruction ORs the corresponding bits of
two input bytes and loads the result (OUT) in a
byte.
The Exclusive Or Byte instruction XORs the
corresponding bits of two input bytes and loads the result
(OUT) in a byte.
IN2
Error conditions that set ENO = 0: SM4.3 (run-time),
0006 (indirect address)
WXOR_B
EN
ENO
These instructions affect the following Special Memory
bits: SM1.0 (zero)
IN1 OUT
IN2
S
T
L
ANDB
IN1, OUT
ORB
IN1, OUT
XORB
IN1, OUT
3
3
3
221
222
224
Inputs/Outputs
Operands
Data Types
IN1, IN2
VB, IB, QB, MB, SB, SMB, LB, AC, Constant, *VD, *AC, *LD
BYTE
OUT
VB, IB, QB, MB,SB, SMB, LB, AC, *VD, *AC, *LD
BYTE
9-110
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
And Word, Or Word, Exclusive Or Word
L
A
D
WAND_W
EN
ENO
F
B
D
IN1 OUT
IN2
WOR_W
EN
ENO
IN1 OUT
The And Word instruction ANDs the corresponding bits
of two input words and loads the result (OUT) in a word.
The Or Word instruction ORs the corresponding bits of
two input words and loads the result (OUT) in a
word.
The Exclusive Or Word instruction XORs the
corresponding bits of two input words and loads the
result (OUT) in a word.
IN2
Error conditions that set ENO = 0: SM4.3 (run-time),
0006 (indirect address)
WXOR_W
EN
ENO
These instructions affect the following Special Memory
bits: SM1.0 (zero)
IN1 OUT
IN2
S
T
L
ANDW
IN1, OUT
ORW
IN1, OUT
XORW
IN1, OUT
3
3
3
221
222
224
Inputs/Outputs
Operands
Data Types
IN1, IN2
VW, IW, QW, MW, SW, SMW, LW, T, C, AIW, AC, Constant, *VD,
*AC, *LD
WORD
OUT
VW, IW, QW, MW, SW, SMW, LW, T, C, AC, *VD, *AC, *LD
WORD
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-111
SIMATIC Instructions
And Double Word, Or Double Word, Exclusive Or Double Word
L
A
D
WAND_DW
EN
ENO
F
B
D
IN1 OUT
IN2
WOR_DW
EN
ENO
IN1 OUT
The And Double Word instruction ANDs the
corresponding bits of two double word inputs and loads
the result (OUT) in a double word.
The Or Double Word instruction ORs the corresponding
bits of two double word inputs and loads the result (OUT)
in a double word.
The Exclusive Or Double Word instruction XORs the
corresponding bits of two double word inputs and loads
the result (OUT) in a double word.
IN2
Error conditions that set ENO = 0: SM4.3 (run-time),
0006 (indirect address)
WXOR_DW
EN
ENO
These instructions affect the following Special Memory
bits: SM1.0 (zero)
IN1 OUT
IN2
S
T
L
Inputs/Outputs
ANDD
IN1, OUT
ORD
IN1, OUT
XORD
IN1, OUT
3
3
3
221
222
224
Operands
Data Types
IN1, IN2
VD, ID, QD, MD, SMD, AC, LD, HC, Constant, *VD, *AC, SD, *LD
DWORD
OUT
VD, ID, QD, MD, SMD, LD, AC, *VD, *AC, SD, *LD
DWORD
9-112
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
And, Or, and Exclusive Or Instructions Example
LAD
I4.0
STL
WAND_W
EN
ENO
AC1
IN1
AC0
IN2
OUT
LD
ANDW
ORW
XORW
AC0
I4.0
AC1, AC0
AC1, VW100
AC1, AC0
WOR_W
EN
ENO
AC1
IN1
VW100
IN2
OUT
VW100
WXOR_W
EN
ENO
AC1
IN1
AC0
IN2
OUT
AC0
FBD
I4.0
WOR_W
EN
ENO
WAND_W
EN
ENO
AC1
IN1
AC0
IN2
OUT
AC0
AC1
IN1
VW100
IN2
OUT
WXOR_W
EN
ENO
VW100
AC1
IN1
AC0
IN2
OUT
AC0
Application
And Word
Or Word
AC1 0001 1111 0110 1101
AC1 0001 1111 0110 1101
AND
AC0 1101 0011 1110 0110
equals
AC0 0001 0011 0110 0100
Figure 9-37
OR
VW100 1101 0011 1010 0000
equals
VW100 1101 1111 1110 1101
Exclusive Or Word
AC1
0001 1111 0110 1101
XOR
AC0 0001 0011 0110 0100
equals
AC0 0000 1100 0000 1001
Example of the Logical Operation Instructions
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-113
SIMATIC Instructions
Invert Byte, Invert Word, Invert Double Word Instructions
L
A
D
INV_B
EN
ENO
F
B
D
IN
OUT
INV_W
EN
ENO
IN
OUT
INV_DW
EN ENO
IN
Double
Word
9-114
INVB
OUT
INVW
OUT
INVD
OUT
3
3
3
221
222
224
Inputs/Outputs
The Invert Double Word instruction forms the ones
complement of the input double word IN, and loads the
result in double word value OUT.
Error conditions that set ENO = 0: SM4.3 (run-time),
0006 (indirect address)
Operands
Data Types
IN
VB, IB, QB, MB,SB, SMB, LB, AC, Constant, *VD,
*AC, *LD
BYTE
OUT
VB, IB, QB, MB, SB, SMB, LB, AC,*VD, *AC, *LD
BYTE
IN
VW, IW, QW, MW, SW, SMW, T, C, AIW, LW, AC,
Constant, *VD, *AC, *LD
WORD
OUT
VW, IW, QW, MW,SW, SMW, T, C, LW, AC, *VD, *AC,
*LD
WORD
IN
VD, ID, QD, MD, SD, SMD, LD, HC, AC, Constant,
*VD, *AC, *LD
DWORD
OUT
VD, ID, QD, MD, SD, SMD, LD, AC, *VD, *AC, *LD
DWORD
Byte
Word
The Invert Word instruction forms the ones complement
of the input word IN, and loads the result in word value
OUT.
This instruction affects the following Special Memory bits:
SM1.0 (zero)
S
T
L
Invert...
OUT
The Invert Byte instruction forms the ones complement
of the input byte IN, and loads the result into byte value
OUT.
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Invert Example
LAD
STL
I4.0
EN
INV_W
ENO
LD
INVW
I4.0
AC0
FBD
AC0
IN
OUT
AC0
I4.0
EN
INV_W
ENO
AC0
IN
OUT
AC0
Application
Invert Word
AC0
1101 0111 1001 0101
complement
AC0
Figure 9-38
0010 1000 0110 1010
Example of Invert Instruction for LAD and STL
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-115
SIMATIC Instructions
9.13
SIMATIC Shift and Rotate Instructions
Shift Right Byte, Shift Left Byte
L
A
D
SHR_B
EN
ENO
F
B
D
IN
OUT
OUT
N
SHL_B
EN
ENO
IN
OUT
OUT
N
The Shift instructions fill with zeros as each bit is shifted
out. If the shift count (N) is greater than or equal to 8, the
value is shifted a maximum of 8 times.
If the shift count is greater than 0, the overflow memory
bit (SM1.1) takes on the value of the last bit shifted out.
The zero memory bit (SM1.0) is set if the result of the
shift operation is zero.
Shift right and shift left byte operations are unsigned.
S
T
L
SRB
OUT, N
SLB
OUT, N
Error conditions that set ENO = 0: SM4.3 (run-time),
0006 (indirect address)
These instructions affect the following Special Memory
bits: SM1.0 (zero); SM1.1 (overflow)
3
3
3
221
222
224
Inputs/Outputs
The Shift Right Byte and Shift Left Byte instructions
shift the input byte (IN) value right or left by the shift
count (N), and load the result in the output byte
(OUT).
Operands
Data Types
IN, OUT
VB, IB, QB, MB, SB, SMB, LB, AC, *VD, *AC, *LD
BYTE
N
VB, IB, QB, MB, SB, SMB, LB, AC, Constant, *VD, *AC, *LD
BYTE
9-116
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Shift Right Word, Shift Left Word
L
A
D
SHR_W
EN
ENO
F
B
D
IN
OUT
OUT
N
SHL_W
EN
ENO
IN
OUT
OUT
N
S
T
L
The Shift Right Word and Shift Left Word instructions
shift the input word (IN) value right or left by the shift
count (N), and load the result in the output word (OUT).
The Shift instructions fill with zeros as each bit is shifted
out. If the shift count (N) is greater than or equal to 16,
the value is shifted a maximum of 16 times. If the shift
count is greater than 0, the overflow memory bit (SM1.1)
takes on the value of the last bit shifted out. The zero
memory bit (SM1.0) is set if the result of the shift
operation is zero.
Shift right and shift left word operations are unsigned.
SRW
OUT, N
SLW
OUT, N
3
3
3
221
222
224
Error conditions that set ENO = 0: SM4.3 (run-time),
0006 (indirect address)
These instructions affect the following Special Memory
bits: SM1.0 (zero); SM1.1 (overflow)
Inputs/Outputs
Operands
Data Types
IN
VW, IW, QW, MW, SW, SMW, LW, T, C, AIW, AC, Constant, *VD,
*AC, *LD
WORD
N
VB, IB, QB, MB, SB, SMB, LB, AC, Constant, *VD, *AC, *LD
BYTE
OUT
VW, IW, QW, MW, SW, SMW, LW, T, C, AC, *VD, *AC, *LD
WORD
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-117
SIMATIC Instructions
Shift Right Double Word, Shift Left Double Word
L
A
D
SHR_DW
EN
ENO
F
B
D
IN
OUT
OUT
N
SHL_DW
EN
ENO
IN
OUT
OUT
N
The Shift instructions fill with zeros as each bit is shifted
out. If the shift count (N) is greater than or equal to 32,
the value is shifted a maximum of 32 times. If the shift
count is greater than 0, the overflow memory bit (SM1.1)
takes on the value of the last bit shifted out. The zero
memory bit (SM1.0) is set if the result of the shift
operation is zero.
Shift right and shift left double word operations are
unsigned.
S
T
L
Inputs/Outputs
The Shift Right Double Word and Shift Left Double
Word instructions shift the input double word value (IN)
right or left by the shift count (N), and load the result in
the output double word (OUT).
SRD
OUT, N
SLD
OUT, N
Error conditions that set ENO = 0: SM4.3 (run-time),
0006 (indirect address)
These instructions affect the following Special Memory
bits: SM1.0 (zero); SM1.1 (overflow)
3
3
3
221
222
224
Operands
Data Types
IN
VD, ID, QD, MD, SD, SMD, LD, AC, HC, Constant, *VD, *AC, *LD
DWORD
N
VB, IB, QB, MB, SB, SMB, LB, AC, Constant, *VD, *AC, *LD
BYTE
OUT
VD, ID, QD, MD, SD, SMD, LD, AC, *VD, *AC, *LD
DWORD
9-118
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Rotate Right Byte, Rotate Left Byte
L
A
D
ROR_B
EN
ENO
F
B
D
IN
OUT
OUT
N
ROL_B
EN
ENO
IN
OUT
OUT
N
S
T
L
RRB
OUT, N
RLB
OUT, N
3
3
3
221
222
224
The Rotate Right Byte and Rotate Left Byte
instructions rotate the input byte value (IN) right or left by
the shift count (N), and load the result in the output byte
(OUT).
If the shift count (N) is greater than or equal to 8, a
modulo-8 operation is performed on the shift count (N)
before the rotation is executed. This results in a shift
count of 0 to 7. If the shift count is 0, a rotate is not
performed. If the rotate is performed, the value of the last
bit rotated is copied to the overflow bit (SM1.1).
If the shift count is not an integer multiple of 8, the last bit
rotated out is copied to the overflow memory bit (SM1.1).
The zero memory bit (SM1.0) is set when the value to be
rotated is zero.
Rotate right byte and rotate left byte operations are
unsigned.
Error conditions that set ENO = 0: SM4.3 (run-time),
0006 (indirect address)
These instructions affect the following Special Memory
bits: SM1.0 (zero); SM1.1 (overflow)
Inputs/Outputs
Operands
Data Types
IN
VB, IB, QB, MB, SMB, SB, LB, AC, *VD, *AC, *LD
BYTE
N
VB, IB, QB, MB, SMB, SB, LB, AC, Constant, *VD, *AC, *LD
BYTE
OUT
VB, IB, QB, MB, SMB, SB, LB, AC, *VD, *AC, *LD
BYTE
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-119
SIMATIC Instructions
Rotate Right Word, Rotate Left Word
L
A
D
ROR_W
ENO
EN
F
B
D
IN
OUT
OUT
N
EN
ROL_W
ENO
IN
OUT
OUT
N
S
T
L
RRW
OUT, N
RLW
OUT, N
3
3
3
221
222
224
The Rotate Right Word and Rotate Left Word
instructions rotate the input word value (IN) right or left
by the shift count (N), and load the result in the output
word (OUT).
If the shift count (N) is greater than or equal to 16, a
modulo-16 operation is performed on the shift count (N)
before the rotation is executed. This results in a shift
count of 0 to 15. If the shift count is 0, a rotation is not
performed. If the rotation is performed, the value of the
last bit rotated is copied to the overflow bit (SM1.1).
If the shift count is not an integer multiple of 16, the last
bit rotated out is copied to the overflow memory bit
(SM1.1). The zero memory bit (SM1.0) is set when the
value to be rotated is zero.
Rotate right word and rotate left word operations are
unsigned.
Error conditions that set ENO = 0: SM4.3 (run-time),
0006 (indirect address)
These instructions affect the following Special Memory
bits: SM1.0 (zero); SM1.1 (overflow)
Inputs/Outputs
Operands
Data Types
IN
VW, T, C, IW, MW, SMW, AC, QW, LW, AIW, Constant, *VD, *AC,
SW, *LD
WORD
N
VB, IB, QB, MB, SMB, LB, AC, Constant, *VD, *AC, SB, *LD
BYTE
OUT
VW, T, C, IW, QW, MW, SMW, LW, AC, *VD, *AC, SW, *LD
WORD
9-120
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Rotate Right Double Word, Rotate Left Double Word
L
A
D
ROR_DW
ENO
EN
F
B
D
IN
OUT
OUT
N
ROL_DW
EN
ENO
IN
OUT
OUT
N
S
T
L
RRD
OUT, N
RLD
OUT, N
3
3
3
221
222
224
The Rotate Right Double Word and Rotate Left
Double Word instructions rotate the input double word
value (IN) right or left by the shift count (N), and load the
result in the output double word (OUT).
If the shift count (N) is greater than or equal to 32, a
modulo-32 operation is performed on the shift count (N)
before the rotation is executed. This results in a shift
count of 0 to 31. If the shift count is 0, a rotation is not
performed. If the rotation is performed, the value of the
last bit rotated is copied to the overflow bit (SM1.1).
If the shift count is not an integer multiple of 32, the last
bit rotated out is copied to the overflow memory bit
(SM1.1). The zero memory bit (SM1.0) is set when the
value to be rotated is zero.
Rotate right double word and rotate left double word
operations are unsigned.
Error conditions that set ENO = 0: SM4.3 (run-time),
0006 (indirect address)
These instructions affect the following Special Memory
bits: SM1.0 (zero); SM1.1 (overflow)
Inputs/Outputs
Operands
Data Types
IN
VD, ID, QD, MD, SMD, LD, AC, HC, Constant, *VD, *AC, SD, *LD
DWORD
N
VB, IB, QB, MB, SMB, LB, AC, Constant, *VD, *AC, SB, *LD
BYTE
OUT
VD, ID, QD, MD, SMD, LD, AC, *VD, *AC, SD, *LD
DWORD
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-121
SIMATIC Instructions
Shift and Rotate Examples
LAD
I4.0
STL
LD
RRW
SLW
ROR_W
EN
ENO
AC0
IN
2
N
VW200
FBD
OUT
SHL_W
EN
ENO
IN
OUT
AC0
I4.0
AC0
ROR_W
EN
ENO
IN
OUT
AC0
VW200
SHL_W
EN
ENO
IN OUT
VW200
VW200
2
3
I4.0
AC0, 2
VW200, 3
N
N
3 N
Application
Rotate
Before rotate
AC0
0100 0000 0000 0001
After first rotate
AC0
1010 0000 0000 0000
After second rotate
AC0
0101 0000 0000 0000
Zero Memory Bit (SM1.0)
Overflow Memory Bit (SM1.1)
Shift
Overflow
x
Before shift
VW200
Overflow
1
After first shift
VW200
1100 0101 0101 1010
VW200
1000 1010 1011 0100
Overflow
0
After second shift
VW200
Overflow
1
Overflow
1
Overflow
0001 0101 0110 1000
Zero Memory Bit (SM1.0)
=
Overflow Memory Bit (SM1.1) =
9-122
x
= 0
= 0
After third shift
Figure 9-39
Overflow
1110 0010 1010 1101
1
0
1
Example of Shift and Rotate Instructions for LAD, STL, and FBD
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Shift Register Bit
L
A
D
SHRB
EN ENO
F
B
D
DATA
S_BIT
N
S
T
L
SHRB DATA, S_BIT, N
3
3
3
221
222
224
The Shift Register Bit (SHRB) instruction shifts the
value of DATA into the Shift Register. S_BIT specifies the
least significant bit of the Shift Register. N specifies the
length of the Shift Register and the direction of the shift
(Shift Plus = N, Shift Minus = -N).
Each bit shifted out by the SHRB instruction is placed in
the overflow memory bit (SM1.1).
Error conditions that set ENO = 0: SM4.3 (run-time),
0006 (indirect address), 0091 (operand out of range),
0092 (error in count field)
This instruction affects the following Special Memory bit:
SM1.1 (overflow)
Inputs/Outputs
Operands
Data Types
DATA, S_BIT
I, Q, M, SM, T, C, V, S, L
BOOL
N
VB, IB, QB, MB, SMB, LB, AC, Constant, *VD, *AC, SB, *LD
BYTE
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-123
SIMATIC Instructions
Understanding the Shift Register Bit Instruction
The Shift Register Bit instruction provides an easy method for sequencing and
controlling product flow or data. Use the Shift Register Bit instruction to shift the
entire register one bit, once per scan. The Shift Register Bit instruction is defined
by both the least significant bit (S_BIT) and the number of bits specified by the
length (N). Figure 9-41 shows an example of the Shift Register Bit instruction.
The address of the most significant bit of the Shift Register (MSB.b) can be
computed by the following equation:
MSB.b = [(Byte of S_BIT) + ([N] - 1 + (bit of S_BIT)) / 8] . [remainder of the
division by 8]
You must subtract 1 bit because S_BIT is one of the bits of the Shift Register.
For example, if S_BIT is V33.4, and N is 14, then the MSB.b is V35.1, or:
MSB.b
= V33 + ([14] - 1 +4)/8
= V33 + 17/8
= V33 + 2 with a remainder of 1
= V35.1
On a Shift Minus, indicated by a negative value of length (N), the input data shifts
into the most significant bit of the Shift Register, and shifts out of the least
significant bit (S_BIT).
On a Shift Plus, indicated by a positive value of length (N), the input data (DATA)
shifts into the least significant bit of the Shift Register, specified by the S_BIT, and
out of the most significant bit of the Shift Register.
The data shifted out is then placed in the overflow memory bit (SM1.1). The
maximum length of the shift register is 64 bits, positive or negative. Figure 9-40
shows bit shifting for negative and positive values of N.
Shift Minus, Length = -14
S_BIT
MSB
V33
7
V34
7
V35
7
Shift Plus, Length = 14
LSB
4
1
S_BIT
MSB
0
V33
7
0
V34
7
0
V35
7
MSB of Shift Register
Figure 9-40
9-124
LSB
4
0
0
1
0
MSB of Shift Register
Shift Register Entry and Exit for Plus and Minus Shifts
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Shift Register Bit Example
LAD
I0.2
STL
P
SHRB
EN ENO
I0.3
DATA
V100.0
4
LD
EU
SHRB
I0.2
I0.3, V100.0, 4
S_BIT
N
FBD
I0.2 IN
P
SHRB
EN ENO
OUT
I0.3
V100.0
4
DATA
S_BIT
N
Timing Diagram
I0.2
Positive transition (P)
I0.3
First shift
Second shift
MSB
7
Before first shift
V100
LSB
0
0 1
0
1
S_BIT
I0.3
1
1
S_BIT
I0.3
1
0
S_BIT
I0.3
Overflow (SM1.1) x
After first shift
V100
1 0
Overflow (SM1.1) 0
After second shift
V100
0 1
Overflow (SM1.1) 1
Figure 9-41
Example of Bit Shift Register Instruction for LAD, STL, and FBD
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-125
SIMATIC Instructions
9.14
SIMATIC Conversion Instructions
BCD to Integer, Integer to BCD
L
A
D
BCD_I
EN ENO
F
B
D
IN
OUT
I_BCD
EN ENO
IN
S
T
L
OUT
BCDI
OUT
IBCD
OUT
3
3
3
221
222
224
Inputs/Outputs
The BCD to Integer instruction converts the input
Binary-Coded Decimal (IN) to an integer value and loads
the result into the variable specified by OUT. The valid
range for IN is 0 to 9999 BCD.
The Integer to BCD instruction converts the input integer
value (IN) to a Binary-Coded Decimal and loads the
result into the variable specified by OUT. The valid range
for IN is 0 to 9999 integer.
Error conditions that set ENO = 0: SM1.6 (BCD error),
SM4.3 (run-time), 0006 (indirect address)
These instructions affect the following Special Memory
bits: SM1.6 (invalid BCD)
Operands
Data Types
IN
VW, T, C, IW, QW, MW, SMW, LW, AC, AIW, Constant, *VD, *AC,
SW, *LD
WORD
OUT
VW, T, C, IW, QW, MW, SMW, LW, AC, *VD, *AC, SW, *LD
WORD
Double Integer to Real
L
A
D
DI_R
EN ENO
F
B
D
S
T
L
Inputs/Outputs
IN
DTR
OUT
The Double Integer to Real instruction converts a
32-bit, signed integer (IN) into a 32-bit real number and
places the result into the variable specified by OUT.
Error conditions that set ENO = 0: SM4.3 (run-time),
0006 (indirect address)
IN, OUT
3
3
3
221
222
224
Operands
Data Types
IN
VD, ID, QD, MD, SMD, AC, LD, HC, Constant, *VD, *AC, SD, *LD
DINT
OUT
VD, ID, QD, MD, SMD, LD, AC, *VD, *AC, SD, *LD
REAL
9-126
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Round
L
A
D
ROUND
EN ENO
F
B
D
IN
OUT
The Round instruction converts the real value (IN) to a
double integer value and places the result into the
variable specified by OUT. If the fraction portion is 0.5 or
greater, the number is rounded up.
Error conditions that set ENO = 0: SM1.1 (overflow),
SM4.3 (run-time), 0006 (indirect address)
S
T
L
ROUND IN, OUT
3
3
3
221
222
224
These instructions affect the following Special Memory
bits: SM1.1 (overflow)
Inputs/Outputs
Operands
Data Types
IN
VD, ID, QD, MD, SMD, AC, LD, HC, Constant, *VD, *AC, SD, *LD
REAL
OUT
VD, ID, QD, MD, SMD, LD, AC, *VD, *AC, SD, *LD
DINT
Truncate
L
A
D
TRUNC
EN ENO
F
B
D
IN
S
T
L
OUT
TRUNC IN, OUT
3
221
3
222
3
224
The Truncate instruction converts a 32-bit real number
(IN) into a 32-bit signed integer and places the result into
the variable specified by OUT. Only the whole number
portion of the real number is converted, and the fraction
is discarded.
If the value that you are converting is not a valid real
number or is too large to be represented in the output,
then the overflow bit is set and the output is not affected.
Error conditions that set ENO = 0: SM1.1 (overflow),
SM4.3 (run-time), 0006 (indirect address)
This instruction affects the following Special Memory bits:
SM1.1 (overflow)
Inputs/Outputs
Operands
Data Types
IN
VD, ID, QD, MD, SMD, LD, AC, Constant, *VD, *AC, SD, *LD
REAL
OUT
VD, ID, QD, MD, SMD, LD, AC, *VD, *AC, SD, *LD
DINT
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-127
SIMATIC Instructions
Double Integer to Integer
L
A
D
DI_I
EN
ENO
F
B
D
IN
S
T
L
DTI
OUT
IN, OUT
3
3
3
221
222
224
Inputs/Outputs
The Double Integer to Integer instruction converts the
double integer value (IN) to an integer value and places
the result into the variable specified by OUT.
If the value that you are converting is too large to be
represented in the output, then the overflow bit is set and
the output is not affected.
Error conditions that set ENO = 0: SM1.1 (overflow),
SM4.3 (run-time), 0006 (indirect address)
These instructions affect the following Special Memory
bits: SM1.1 (overflow)
Operands
Data Types
IN
VD, ID, QD, MD, SMD, AC, LD, HC, Constant, *VD, *AC, SD, *LD
DINT
OUT
VW, IW, QW, MW, SW, SMW, LW, T, C, AC, *VD, *LD, *AC
INT
Integer to Double Integer
L
A
D
I_DI
EN
ENO
F
B
D
IN
S
T
L
ITD
OUT
Error conditions that set ENO = 0: SM4.3 (run-time),
0006 (indirect address)
IN, OUT
3
3
3
221
222
224
Inputs/Outputs
The Integer to Double Integer instruction converts the
integer value (IN) to a double integer value and places
the result into the variable specified by OUT. The sign is
extended.
Operands
Data Types
IN
VW, IW, QW, MW, SW, SMW, LW, T, C, AIW, AC, Constant, *AC,
*VD, *LD
INT
OUT
VD, ID, QD, MD, SD, SMD, LD, AC, *VD, *LD, *AC
DINT
9-128
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Byte to Integer
L
A
D
B_I
EN
ENO
F
B
D
IN
OUT
The Byte to Integer instruction converts the byte value
(IN) to an integer value and places the result into the
variable specified by OUT. The byte is unsigned,
therefore there is no sign extension.
Error conditions that set ENO = 0: SM4.3 (run-time),
0006 (indirect address)
S
T
L
BTI
IN, OUT
3
3
3
221
222
224
Inputs/Outputs
Operands
Data Types
IN
VB, IB, QB, MB, SB, SMB, LB, AC, Constant, *AC, *VD, *LD
BYTE
OUT
VW, IW, QW, MW, SW, SMW, LW, T, C, AC, *VD, *LD, *AC
INT
Integer to Byte
L
A
D
F
B
D
S
T
L
EN
I_B
ENO
IN
OUT
ITB
IN, OUT
3
3
3
221
222
224
The Integer to Byte instruction converts the word value
(IN) to a byte value and places the result into the variable
specified by OUT.
Values 0 to 255 are converted. All other values result in
overflow and the output is not affected.
Error conditions that set ENO = 0: SM1.1 (overflow),
SM4.3 (run-time), 0006 (indirect address)
These instructions affect the following Special Memory
bits: SM1.1 (overflow)
Inputs/Outputs
Operands
Data Types
IN
VW, IW, QW, MW, SW, SMW, LW, T, C, AIW, AC, Constant, *VD,
*LD, *AC
INT
OUT
VB, IB, QB, MB, SB, SMB, LB, AC, *VD, *AC, *LD
BYTE
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-129
SIMATIC Instructions
Convert Example
LAD
Network 1
I0.0
I_DI
EN ENO
C10
IN OUT
DI_R
EN ENO
STL
Clear accumulator 1.
Load counter value
(number of inches)
into AC1.
AC1
Network 1
LD
I0.0
ITD
C10,
DTR
AC1,
MOVR
VD0,
*R
VD4,
ROUND
VD8,
AC1
VD0
VD8
VD8
VD12
Convert to a real number.
AC1
IN
OUT
VD0
VD0
MUL_R
EN ENO
IN1 OUT
VD8
VD4
Multiply by 2.54 to change
to centimeters.
IN2
ROUND
EN ENO
Convert back to an integer.
VD8
Network 2
I3.0
AC0
IN
OUT
VD12
Network 2
LD
I3.0
BCDI
AC0
BCD_I
EN ENO
IN
OUT
AC0
FBD
Network 1
I_DI
I0.0 EN
ENO
C10
IN
OUT
AC1
EN
DI_R
ENO
MUL_R
EN
ENO
AC1 IN
OUT
VD0 IN1 OUT
VD0 VD4 IN2
ROUND
EN ENO
VD8
VD8 IN
OUT
VD12
Network 2
BCD_I
I3.0 EN ENO
AC0
IN
OUT
AC0
Application
Double Word Integer to Real and Round
C10
BCD to Integer
Count = 101 inches
VD0
101.0
VD4
2.54
VD8
256.54
V12
257
Figure 9-42
9-130
101
AC0
2.54 constant (inches to centimeters)
256.54 centimeters as real number
1234
BCDI
AC0
04D2
257 centimeters as integer
Example of Conversion Instructions
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Decode
L
A
D
DECO
EN ENO
F
B
D
IN
OUT
The Decode instruction sets the bit in the output word
(OUT) that corresponds to the bit number represented by
the least significant “nibble” (4 bits) of the input byte (IN).
All other bits of the output word are set to 0.
Error conditions that set ENO = 0: SM4.3 (run-time),
0006 (indirect address)
S
T
L
DECO
3
221
3
222
IN, OUT
3
224
Inputs/Outputs
Operands
Data Types
IN
VB, IB, QB, MB, SMB, LB, SB, AC, Constant, *VD, *AC, *LD
BYTE
OUT
VW, IW, QW, MW, SMW, LW, SW, AQW, T, C, AC, *VD, *AC, *LD
WORD
Encode
L
A
D
ENCO
EN ENO
F
B
D
IN
S
T
L
ENCO
OUT
The Encode instruction writes the bit number of the least
significant bit set of the input word (IN) into the least
significant “nibble” (4 bits) of the output byte (OUT).
Error conditions that set ENO = 0: SM4.3 (run-time),
0006 (indirect address)
IN, OUT
3
3
3
221
222
224
Inputs/Outputs
Operands
Data Types
IN
VW, T, C, IW, QW, MW, SMW, AC, LW, AIW, Constant, *VD, *AC,
SW, *LD
WORD
OUT
VB, IB, QB, MB, SMB, LB, AC, *VD, *AC, SB, *LD
BYTE
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-131
SIMATIC Instructions
Decode, Encode Examples
LAD
I3.1
DECO
EN ENO
STL
LD
DECO
Set the bit that corresponds
to the error code in AC2.
I3.1
AC2, VW40
FBD
AC2 IN
OUT
VW40
I3.1
DECO
EN ENO
AC2 IN
OUT
VW40
Application
AC2 contains the error code 3. The DECO instruction
sets the bit in VW40 that corresponds to this error code.
3
AC2
DECO
15
3
0
VW40 0000 0000 0000 1000
Figure 9-43
Example of Setting an Error Bit Using Decode
LAD
I3.1
ENCO
EN ENO
AC2 IN
OUT
STL
LD
ENCO
I3.1
AC2, VB40
Convert the error bit in AC2
to the error code in VB40.
FBD
VB40
I3.1
ENCO
EN ENO
AC2 IN
OUT
VB40
Application
15
AC2 contains the error bit. The ENCO instruction converts the
least significant bit set to an error code that is stored in VB40.
AC2
9-132
0
ENCO
VB40
Figure 9-44
9
1000 0010 0000 0000
9
Example of Converting the Error Bit into an Error Code Using Encode
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Segment
L
A
D
F
B
D
S
T
L
EN
SEG
ENO
IN
OUT
SEG
The Segment instruction uses the character specified by
IN to generate a bit pattern (OUT) that illuminates the
segments of a seven-segment display. The illuminated
segments represent the character in the least significant
digit of the input byte (IN).
IN, OUT
3
3
3
221
222
224
Error conditions that set ENO = 0: SM4.3 (run-time),
0006 (indirect address)
Figure 9-45 shows the seven segment display coding
used by the Segment instruction.
Inputs/Outputs
Operands
Data Types
IN
VB, IB, QB, MB, SMB, LB, AC, Constant, *VD, *AC, SB, *LD
BYTE
OUT
VB, IB, QB, MB, SMB, LB, AC, *VD, *AC, SB, *LD
BYTE
(IN)
LSD
Segment
Display
0
(OUT)
-gfe dcba
0011
(IN)
LSD
1111
1
0000
0110
2
0101
1011
3
0100
1111
4
0110
0110
a
f
g
e
b
c
d
Segment
Display
(OUT)
-gfe dcba
8
0111
1111
9
0110
0111
A
0111
0111
B
0111
1100
C
0011
1001
5
0110
1101
D
0101
1110
6
0111
1101
E
0111
1001
7
0000
0111
F
0111
0001
Figure 9-45
Seven Segment Display Coding
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-133
SIMATIC Instructions
Segment Example
LAD
STL
LD
SEG
I3.3
VB48
EN
SEG
ENO
IN
OUT
I3.3
VB48, AC1
FBD
AC1
I3.3
EN
SEG
ENO
VB48
IN
OUT
AC1
Application
VB48
05
SEG
AC1
Figure 9-46
9-134
6D
(display character)
Example of Segment Instruction
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
ASCII to HEX, HEX to ASCII
L
A
D
The ASCII to HEX instruction converts the ASCII string
of length (LEN), starting at IN, to hexadecimal digits
starting at OUT. The maximum length of the ASCII string
is 255 characters.
ATH
ENO
EN
F
B
D
IN
OUT
The HEX to ASCII instruction converts the hexadecimal
digits, starting with the input byte (IN), to an ASCII string
starting at OUT. The number of hexadecimal digits to be
converted is specified by length (LEN). The maximum
number of the hexadecimal digits that can be converted
is 255.
LEN
EN
HTA
ENO
IN
OUT
LEN
S
T
L
Legal ASCII characters are the hexadecimal values 30 to
39, and 41 to 46.
ATH IN, OUT, LEN
HTA IN, OUT, LEN
3
3
3
221
222
224
ASCII to Hex: Error conditions that set ENO = 0:
SM1.7 (illegal ASCII), SM4.3 (run-time),
0006 (indirect address), 0091 (operand out of range)
Hex to ASCII: Error conditions that set ENO = 0:
SM4.3 (run-time), 0006 (indirect address),
0091 (operand out of range)
These instructions affect the following Special Memory
bits: SM1.7 (illegal ASCII)
Inputs/Outputs
Operands
Data Types
IN, OUT
VB, IB, QB, MB, SMB, LB, *VD, *AC, SB, *LD
BYTE
LEN
VB, IB, QB, MB, SMB, LB, AC, Constant, *VD, *AC, SB, *LD
BYTE
ASCII to HEX Example
LAD
I3.2
STL
EN
ATH
ENO
VB30 IN
OUT
LD
ATH
I3.2
VB30, VB40, 3
VB40
3 LEN
Application
FBD
EN
ATH
ENO
VB30 IN
OUT
I3.2
VB30 33
45
41
ATH
3 LEN
Figure 9-47
VB40
VB40 3E AX
Note: The X indicates that the “nibble” (half of a byte)
is unchanged.
Example of ASCII to HEX Instruction
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-135
SIMATIC Instructions
Integer to ASCII
L
A
D
ITA
ENO
EN
F
B
D
IN
OUT
FMT
S
T
L
Inputs/Outputs
ITA IN, OUT, FMT
3
3
3
221
222
224
The Integer to ASCII instruction converts an integer
word (IN) to an ASCII string. The format (FMT) specifies
the conversion precision to the right of the decimal, and
whether the decimal point is to be shown as a comma or
a period. The resulting conversion is placed in 8
consecutive bytes beginning with OUT. The ASCII string
is always 8 characters.
Error conditions that set ENO = 0: SM4.3 (run-time),
0006 (indirect address), no output (illegal format)
Operands
Data Types
IN
VW, IW, QW, MW, SW, SMW, LW, AIW, T, C, AC, Constant, *VD,
*AC, *LD
INT
FMT
VB, IB, QB, MB, SMB, LB, AC, Constant, *VD, *AC, SB, *LD
BYTE
OUT
VB, IB, QB, MB, SMB, LB, *VD, *AC, SB, *LD
BYTE
9-136
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
The format operand (FMT) for the ITA (Integer to ASCII) instruction is defined in
Figure 9-48. The size of the output buffer is always 8 bytes. The number of digits
to the right of the decimal point in the output buffer is specified by the nnn field.
The valid range of the nnn field is 0 to 5. Specifying 0 digits to the right of the
decimal point causes the value to be displayed without a decimal point. For values
of nnn bigger than 5, the output buffer is filled with ASCII spaces. The c bit
specifies the use of either a comma (c=1) or a decimal point (c=0) as the separator
between the whole number and the fraction. The upper 4 bits must be zero.
The output buffer is formatted in accord with the following rules:
1. Positive values are written to the output buffer without a sign.
2. Negative values are written to the output buffer with a leading minus sign (-).
3. Leading zeros to the left of the decimal point (except the digit adjacent to the
decimal point) are suppressed.
4. Values are right-justified in the output buffer.
Figure 9-48 gives examples of values that are formatted using a decimal point (c =
0) with three digits to the right of the decimal point (nnn = 011).
MSB
7 6
0 0
FMT
Example:
c = comma (1) or decimal point (0)
nnn = digits to right of decimal point
Figure 9-48
5
0
4
0
3
c
2
n
1
n
LSB
0
n
Out Out Out Out Out Out Out Out
+1 +2 +3 +4 +5 +6 +7
in=12
in=-123
in=1234
in = -12345
-
0
.
0
1
2
-
0
1
2
3
1
1
2
.
.
2
3
3
4
4
5
.
FMT Operand for the ITA Instruction
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-137
SIMATIC Instructions
Double Integer to ASCII
L
A
D
DTA
ENO
EN
F
B
D
IN
OUT
FMT
S
T
L
Inputs/Outputs
The Double Integer to ASCII instruction converts a
double word (IN) to an ASCII string. The format (FMT)
specifies the conversion precision to the right of the
decimal. The resulting conversion is placed in 12
consecutive bytes beginning with OUT.
Error conditions that set ENO = 0: SM4.3 (run-time),
0006 (indirect address), no output (illegal format)
DTA IN, OUT, FMT
3
3
3
221
222
224
Operands
Data Types
IN
VD, ID, QD, MD, SD, SMD, LD, HC, Constant, AC, *VD, *AC, *LD
DINT
FMT
VB, IB, QB, MB, SMB, LB, AC, Constant, *VD, *AC, SB, *LD
BYTE
OUT
VB, IB, QB, MB, SMB, LB, *VD, *AC, SB, *LD
BYTE
The format operand (FMT) for the DTA instruction is defined in Figure 9-49. The
size of the output buffer is always 12 bytes. The number of digits to the right of the
decimal point in the output buffer is specified by the nnn field. The valid range of
the nnn field is 0 to 5. Specifying 0 digits to the right of the decimal point causes
the value to be displayed without a decimal point. For values of nnn bigger than 5,
the output buffer is filled with ASCII spaces. The c bit specifies the use of either a
comma (c=1) or a decimal point (c=0) as the separator between the whole number
and the fraction. The upper 4 bits must be zero. The output buffer is formatted in
accord with the following rules:
1. Positive values are written to the output buffer without a sign.
2. Negative values are written to the output buffer with a leading minus sign (-).
3. Leading zeros to the left of the decimal point (except the digit adjacent to the
decimal point) are suppressed.
4. Values are right-justified in the output buffer.
9-138
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Figure 9-49 gives examples of values that are formatted using a decimal point (c =
0) with four digits to the right of the decimal point (nnn = 100).
MSB
FMT
7
0
Example:
LSB
6
0
5
0
4
0
3 2
c n
1
n
0
n
c = comma (1) or decimal point (0)
nnn = digits to right of decimal point
Out Out Out Out Out Out Out Out Out Out Out Out
+1 +2 +3 +4 +5 +6 +7 +8 +9 +10 +11
. 0 0 1
2
in=-12
- 0
6
7
1
2 3
. 4 5
in=1234567
Figure 9-49 FMT Operand for DTA Instruction
Real to ASCII
L
A
D
RTA
ENO
EN
F
B
D
IN
OUT
FMT
S
T
L
RTA IN, OUT, FMT
3
3
3
221
222
224
The Real to ASCI instruction converts a floating point
value (IN) to an ASCII string. The format (FMT) specifies
the conversion precision to the right of the decimal, and
whether the decimal point is shown as a decimal point or
a period, and the output buffer size. The resulting
conversion is placed in an output buffer beginning with
OUT. The length of the resulting ASCII string is the size
of the output buffer, and can be specified to a size
ranging from 3 to 15.
Error conditions that set ENO = 0: SM4.3 (run-time),
0006 (indirect address), no output (illegal format or buffer
too small)
Inputs/Outputs
Operands
Data Types
IN
VD, ID, QD, MD, SD, SMD, LD, AC, *VD, *AC, *LD
REAL
FMT
VB, IB, QB, MB, SMB, LB, AC, Constant, *VD, *AC, SB, *LD
BYTE
OUT
VB, IB, QB, MB, SMB, LB, *VD, *AC, SB, *LD
BYTE
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-139
SIMATIC Instructions
The format operand (FMT) for the RTA instruction is defined in Figure 9-50. The
size of the output buffer is specified by the ssss field. A size of 0, 1, or 2 bytes is
not valid. The number of digits to the right of the decimal point in the output buffer
is specified by the nnn field. The valid range of the nnn field is 0 to 5. Specifying 0
digits to the right of the decimal point causes the value to be displayed without a
decimal point. The output buffer is filled with ASCII spaces for values of nnn bigger
than 5 or when the specified output buffer is too small to store the converted value.
The c bit specifies the use of either a comma (c=1) or a decimal point (c=0) as the
separator between the whole number and the fraction. The output buffer is
formatted in accord with the following rules:
1. Positive values are written to the output buffer without a sign.
2. Negative values are written to the output buffer with a leading minus sign (-).
3. Leading zeros to the left of the decimal point (except the digit adjacent to the
decimal point) are suppressed.
4. Values to the right of the decimal point are rounded to fit in the specified
number of digits to the right of the decimal point.
5. The size of the output buffer must be a minimum of three bytes more than the
number of digits to the right of the decimal point.
6. Values are right-justified in the output buffer.
Figure 9-50 gives examples of values that are formatted using a decimal point
(c=0) with one digit to the right of the decimal point (nnn=001) and a buffer size of
six bytes (ssss=0110).
MSB
7
s
LSB
6
s
5
s
4
s
3
c
2
n
1
n
0
n
ssss = size of output buffer
c = comma (1) or decimal point (0)
nnn = digits to right of decimal point
in = 1234.5
in = -0.0004
in = -3.67526
in = 1.95
Figure 9-50
Out Out Out Out Out Out
+1 +2 +3 +4 +5
1
2 3
4
5
.
-
0
.
0
3
.
.
7
2
0
FMT Operand for RTA Instruction
Note
The floating point format used by the S7-200 CPU supports a maximum of
7 significant digits. Attempting to display more than the 7 significant digits
produces a rounding error.
9-140
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
9.15
SIMATIC Program Control Instructions
End
L
A
D
END
The Conditional END instruction terminates the main
user program based upon the condition of the preceding
logic.
Operands:
F
B
D
END
S
T
L
None
Data Types: None
END
3
3
3
221
222
224
Note
You can use the Conditional END instruction in the main program, but you cannot
use it in either subroutines or interrupt routines.
Note
Micro/WIN 32 automatically adds an unconditional end to the main user program.
Stop
L
A
D
STOP
The STOP instruction terminates the execution of your
program immediately by causing a transition of the CPU
from RUN to STOP mode.
Operands:
F
B
D
STOP
S
T
L
STOP
3
3
3
221
222
224
None
If the STOP instruction is executed in an interrupt
routine, the interrupt routine is terminated immediately,
and all pending interrupts are ignored. Remaining actions
in the current scan cycle are completed, including
execution of the main user program, and the transition
from RUN to STOP mode is made at the end of the
current scan.
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-141
SIMATIC Instructions
Watchdog Reset
L
A
D
WDR
The Watchdog Reset instruction allows the CPU system
watchdog timer to be retriggered. This extends the time
that the scan is allowed to take without getting a
watchdog error.
Operands:
F
B
D
None
WDR
S
T
L
WDR
3
3
3
221
222
224
Considerations for Using the WDR Instruction to Reset the Watchdog Timer
You should use the Watchdog Reset instruction carefully. If you use looping
instructions either to prevent scan completion, or to delay excessively the
completion of the scan, the following processes are inhibited until the scan cycle is
completed.
Communication (except Freeport Mode)
I/O updating (except Immediate I/O)
Force updating
SM bit updating (SM0, SM5 to SM29 are not updated)
Run-time diagnostics
10-ms and 100-ms timers will not properly accumulate time for scans exceeding
25 seconds
STOP instruction, when used in an interrupt routine
Note
If you expect your scan time to exceed 300 ms, or if you expect a burst of interrupt
activity that may prevent returning to the main scan for more than 300 ms, you
should use the WDR instruction to re-trigger the watchdog timer.
Changing the switch to the STOP position will cause the CPU to transition to
STOP mode within 1.4 seconds.
9-142
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Stop, End, and WDR Example
LAD
Network 1
SM5.0
STL
STOP
When an I/O error is detected,
force the transition to STOP mode.
WDR
When M5.6 is on, retrigger the
Watchdog Reset (WDR) to allow
the scan time to be extended.
.
.
.
Network 15
M5.6
.
.
.
Network
78
I0.0
END
.
.
.
Network 1
LD
SM5.0
STOP
.
.
.
Network 15
LD
M5.6
WDR
.
.
.
Network 78
LD
I0.0
END
When I0.0 is on,
terminate the main program.
FBD
Network 1
STOP
SM5.0
When an I/O error is detected,
force the transition to STOP mode.
Network 15
WDR
When M5.6 is on, retrigger the
Watchdog Reset (WDR) to allow
the scan time to be extended.
END
When I0.0 is on,
terminate the main program.
M5.6
Network 78
I0.0
Figure 9-51
Example of Stop, End, and WDR Instructions for LAD, STL, and FBD
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-143
SIMATIC Instructions
Jump to Label, Label
L
A
D
The Jump to Label instruction performs a branch to the
specified label (n) within the program. When a jump is
taken, the top of stack value is always a logical 1.
n
JMP
n
LBL
F
B
D
The Label instruction marks the location of the jump
destination (n).
Operands:
n
JMP
JMP
n
LBL
n
3
3
3
221
222
224
0 to 255
Data Types: WORD
Both the Jump and corresponding Label must be in the
main program, a subroutine, or an interrupt routine. You
cannot jump from the main program to a label in either a
subroutine or an interrupt routine. Likewise, you cannot
jump from a subroutine or interrupt routine to a label
outside that subroutine or interrupt routine.
n
LBL
S
T
L
n:
Jump to Label Example
LAD
Network 14
SM0.2
/
4
JMP
.
.
.
STL
If the retentive data has not been lost,
jump to LBL 4.
You can use the JMP to LBL instruction
in the main program, in subroutines, or
in interrupt routines.The JMP and its
corresponding LBL must always be
located within the same segment of
code (either the main program, a
subroutine, or an interrupt routine).
Network 33
4
LBL
Network
LDN
SM0.2
JMP
4
.
.
.
Network
LBL
4
FBD
Network 14
.
.
.
.
Network 33
Figure 9-52
9-144
4
JMP
If the retentive data has not been lost,
jump to LBL 4.
SM0.2
4
LBL
You can use the JMP to LBL instruction
in the main program, in subroutines, or
in interrupt routines.The JMP and its
corresponding LBL must always be
located within the same segment of
code (either the main program, a
subroutine, or an interrupt routine).
Example of Jump to Label and Label Instructions for LAD, STL, and FBD
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Subroutine, Return from Subroutine
L
A
D
SBR
RET
F
B
D
L
A
D
EN
SBRn
The Call Subroutine instruction transfers control to the
subroutine (n). You can use a Call Subroutine instruction
with or without parameters. To add a subroutine, select
Edit > Insert > Subroutine from the menu.
The Conditional Return from Subroutine instruction is
used to terminate a subroutine based upon the preceding
logic.
Operands:
n:
Constant
Data Types: BYTE
RET
Once the subroutine completes its execution, control
returns to the instruction that follows the Call Subroutine.
S
T
L
SBR
CRET
n
Figure 9-55 shows an example of the Call Subroutine,
and Return from Subroutine instructions.
Error conditions that set ENO for Call Subroutine with
parameters = 0:
3
3
3
221
222
224
SM4.3 (run-time), 0008 (maximum subroutine nesting
exceeded)
Note
Micro/WIN 32 automatically adds a return from each subroutine.
You can nest subroutines (place a subroutine call within a subroutine), to a depth
of eight. Recursion (a subroutine that calls itself) is not prohibited, but you should
use caution when using recursion with subroutines.
When a subroutine is called, the entire logic stack is saved, the top of stack is set
to one, all other stack locations are set to zero, and control is transferred to the
called subroutine. When this subroutine is completed, the stack is restored with the
values saved at the point of call, and control is returned to the calling routine.
Accumulators are common to subroutines and the calling routine. No save or
restore operation is performed on accumulators due to subroutine use.
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-145
SIMATIC Instructions
Calling a Subroutine With Parameters
Subroutines may contain passed parameters. The parameters are defined in the
local variable table of the subroutine (Figure 9-53). The parameters must have a
symbol name (maximum of 8 characters), a variable type, and a data type. Sixteen
parameters can be passed to or from a subroutine.
The variable type field in the local variable table defines whether the variable is
passed into the subroutine (IN), passed into and out of the subroutine (IN_OUT),
or passed out of the subroutine (OUT). The characteristics of the parameter types
are as follows:
IN: parameters are passed into the subroutine. If the parameter is a direct
address (such as VB10), the value at the specified location is passed into the
subroutine. If the parameter is an indirect address (such as *AC1), the value at
the location pointed to is passed into the subroutine. If the parameter is a data
constant (16#1234), or an address (VB100), the constant or address value is
passed into the subroutine.
IN_OUT: the value at the specified parameter location is passed into the
subroutine and the result value from the subroutine is returned to the same
location. Constants (such as 16#1234) and addresses (such as &VB100) are
not allowed for input/output parameters.
OUT: The result value from the subroutine is returned to the specified
parameter location. Constants (such as 16#1234) and addresses (such as
&VB100) are not allowed as output.
TEMP:
Any local memory that is not used for passed parameters may be used for
temporary storage within the subroutine.
To add a parameter entry, place the cursor on the variable type field of the type
(IN, IN_OUT<OUT) that you want to add. Click the right mouse button to get a
menu of options. Select the Insert option and then the Row Below option. Another
parameter entry of the selected type appears below the current entry.
Name
EN
L0.0
IN1
IN2
LB1
LB2.0 IN3
IN4
LD3
LW7 IN/OUT1
OUT1
LD9
Figure 9-53
9-146
Var. Type
IN
IN
IN
IN
IN
IN/OUT
OUT
TEMP
Data Type
BOOL
BOOL
BYTE
Comment
BOOL
DWORD
WORD
DWORD
STEP 7-Micro/WIN 32 Local Variable Table
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
The data type field in the local variable table defines the size and format of the
parameter. The parameter types are:
Power Flow: Boolean power flow is allowed only for bit (Boolean) inputs. This
declaration tells STEP 7-Micro/WIN 32 that this input parameter is the result of
power flow based on a combination of bit logic instructions. Boolean power flow
inputs must appear first in the local variable table before any other type input.
Only input parameters are allowed to be used this way. The enable input (EN)
and the IN1 inputs in Figure 9-54 use Boolean logic.
Boolean - This data type is used for single bit inputs and outputs. IN2 in
Figure 9-54 is a Boolean input.
Byte, Word, Dword - These data types identify an unsigned input or output
parameter of 1, 2, or 4 bytes respectively.
INT, DINT - These data types identify signed input or output parameters of 2 or
4 bytes respectively.
Real - This data type identifies a single precision (4 byte) IEEE floating point
value.
LAD
I0.0
STL
LD
CALL
SBR10
EN
I0.1
VB10
I1.0
&VB100
*AC1
Figure 9-54
IN1
IN2
IN3
IN4
IN/OUT
OUT1
I0.0
10, I0.1, VB10,
I1.0, &VB100,
*AC1, VD200
VD200
Subroutine Call in LAD and STL
Address parameters such as IN4 in Figure 9-54 (&VB100) are passed into a
subroutine as a Dword (unsigned double word) value. The type of a constant
parameter must be specified for the parameter in the calling routine with a constant
describer in front of the constant value. For example, to pass an unsigned double
word constant with a value of 12,345 as a parameter, the constant parameter must
be specified as DW#12345. If the constant describer is omitted from parameter,
the constant may be assumed to be a different type.
There are no automatic data type conversions performed on the input or output
parameters. For example, if the local variable table specifies that a parameter has
the data type Real, and in the calling routine a double word (Dword) is specified for
that parameter, the value in the subroutine will be a double word.
When values are passed to a subroutine, they are placed into the local memory of
the subroutine. The left-most column of the local variable table (see Figure 9-53)
shows the local memory address for each passed parameter. Input parameter
values are copied to the subroutine’s local memory when the subroutine is called.
Output parameter values are copied form the subroutine’s local memory to the
specified output parameter addresses when the subroutine execution is complete.
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-147
SIMATIC Instructions
The data element size and type are represented in the coding of the parameters.
Assignment of parameter values to local memory in the subroutine is as follows:
Parameter values are assigned to local memory in the order specified by the
call subroutine instruction with parameters starting at L.0.
One to eight consecutive bit parameter values are assigned to a single byte
starting with Lx.0 and continuing to Lx.7.
Byte, word, and double word values are assigned to local memory on byte
boundaries (LBx, LWx, or LDx).
In the Call Subroutine instruction with parameters, parameters must be arranged in
order with input parameters first, followed by input/output parameters, and then
followed by output parameters.
If you are programming in STL, the format of the CALL instruction is:
CALL
subroutine number, parameter 1, parameter 2, ... , parameter
Error conditions that set ENO for Call Subroutine with parameters = 0:
SM4.3 (run-time), 0008 (maximum subroutine nesting exceeded)
9-148
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Subroutine, and Return from Subroutine Example
LAD
STL
MAIN
Network 1
SM0.1
SBR10
EN
On the first scan:
Call SBR10 for initialization.
.
.
SUBROUTINE
10
.
.
.
.
Network 6
M14.3
Start of Subroutine 10
RET
.
.
.
A conditional return (RET) from
Subroutine 10 may be used.
Each subroutine is automatically
terminated by STEP 7 Micro/WIN 32
3.0. This terminates Subroutine 10.
Network 1
LD
SM0.1
CALL
10
.
.
.
.
Network 6
LD
M14.3
CRET
.
.
.
FBD
MAIN
SM0.1
SBR10
EN
SUBROUTINE 10
RET
M14.3
Figure 9-55
Example of Subroutine Instructions for LAD, FBD, and STL
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-149
SIMATIC Instructions
For, Next
L
A
D
FOR
ENO
EN
INDX
The NEXT instruction marks the end of the FOR loop,
and sets the top of the stack to 1.
INIT
FINAL
NEXT
F
B
D
FOR
EN
ENO
INDX
INIT
FINAL
NEXT
S
T
L
FOR
The FOR instruction executes the instructions between
the FOR and the NEXT. You must specify the index value
or current loop count (INDX), the starting value (INIT),
and the ending value (FINAL).
For example, given an INIT value of 1 and a FINAL value
of 10, the instructions between the FOR and the NEXT
are executed 10 times with the INDX value being
incremented: 1, 2, 3, ...10.
If the starting value is greater than the final value, the
loop is not executed. After each execution of the
instructions between the FOR and the NEXT instruction,
the INDX value is incremented and the result is
compared to the final value. If the INDX is greater than
the final value, the loop is terminated.
For: Error conditions that set ENO = 0: SM4.3
(run-time), 0006 (indirect address)
INDX,
INIT
FINAL
NEXT
Inputs/Outputs
3
3
3
221
222
224
Operands
Data Types
INDX
VW, IW, QW, MW, SW, SMW, LW, T, C, AC, *VD, *AC, *LD
INT
INIT
VW, IW, QW, MW, SW, SMW, T, C, AC, LW, AIW, Constant, *VD,
*AC, *LD
INT
FINAL
VW, IW, QW, MW, SW, SMW, LW, T, C, AC, AIW, Constant, *VD,
*AC, *LD
INT
9-150
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Here are some guidelines for using the FOR/NEXT loop:
If you enable the FOR/NEXT loop, it continues the looping process until it
finishes the iterations, unless you change the final value from within the loop
itself. You can change the values while the FOR/NEXT is in the looping
process.
When the loop is enabled again, it copies the initial value into the index value
(current loop number). The FOR/NEXT instruction resets itself the next time it is
enabled.
Use the FOR/NEXT instructions to delineate a loop that is repeated for the
specified count. Each FOR instruction requires a NEXT instruction. You can nest
FOR/NEXT loops (place a FOR/NEXT loop within a FOR/NEXT loop) to a depth of
eight.
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-151
SIMATIC Instructions
For/Next Example
LAD
Network 1
I2.0
STL
When I2.0 comes on,
the outside loop
indicated by arrow 1 is
executed 100 times.
FOR
VW100
EN
INDX
1
INIT
100
Network 10
I2.1
VW225
ENO
The inside loop
indicated by arrow 2 is
executed twice for each
execution of the outside
loop when I2.1 is on.
FINAL
FOR
EN
ENO
INDX
1
INIT
2
FINAL
1
Network
LD
I2.0
FOR
VW100, 1, 100
.
.
.
Network
LD
I2.1
FOR
VW225, 1, 2
.
.
.
2
Network 15
Network
NEXT
.
.
Network
NEXT
NEXT
Network 20
NEXT
FBD
Network 1
FOR
ENO
I2.0
VW100
EN
INDX
1
INIT
100
FINAL
Network 10
I2.1
VW225
FOR
ENO
INDX
EN
1
INIT
2
FINAL
Network 15
NEXT
Network 20
NEXT
Figure 9-56
9-152
Example of For/Next Instructions for LAD and STL
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Sequence Control Relay
L
A
D
S bit
SCR
S bit
SCRT
SCRE
F
B
D
S bit
SCR
The Load Sequence Control Relay instruction marks
the beginning of an SCR segment. When the S bit is on,
power flow is enabled to the SCR segment. The SCR
segment must be terminated with an SCRE instruction.
The Sequence Control Relay Transition instruction
identifies the SCR bit to be enabled (the next S bit to be
set). When power flows to the coil or FBD box, the
referenced S bit is turned on and the S bit of the LSCR
instruction (that enabled this SCR segment) is turned
off.
The Sequence Control Relay End instruction marks the
end of an SCR segment.
S bit
SCRT
SCRE
S
T
L
LSCR
S bit
SCRT
S bit
SCRE
3
3
3
221
222
224
Inputs/Outputs
n
Operands
S
Data Types
BOOL
Understanding SCR Instructions
In LAD and STL, Sequence Control Relays (SCRs) are used to organize machine
operations or steps into equivalent program segments. SCRs allow logical
segmentation of the control program.
The LSCR instruction loads the SCR and logic stacks with the value of the S bit
referenced by the instruction. The SCR segment is energized or de-energized by
the resulting value of the SCR stack. The top of the logic stack is loaded to the
value of the referenced S bit so that boxes or output coils can be tied directly to the
left power rail without an intervening contact. Figure 9-57 shows the S stack and
the logic stack and the effect of executing the LSCR instruction.
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-153
SIMATIC Instructions
LSCR
Load the value of Sx.y onto the SCR and logic stacks.
BEFORE
AFTER
S stack
initial value
of S
Figure 9-57
ivs
Logic stack
iv0
S stack
S bit
Sx.y
Logic stack
Sx.y
iv1
iv1
iv2
iv2
iv3
iv3
iv4
iv4
iv5
iv5
iv6
iv6
iv7
iv7
iv8
iv8
Effect of LSCR on the Logic Stack
The following is true of Sequence Control Relay instructions:
All logic between the LSCR and the SCRE instructions make up the SCR
segment and are dependent upon the value of the S stack for its execution.
Logic between the SCRE and the next LSCR instruction have no dependency
upon the value of the S stack.
The SCRT instruction sets an S bit to enable the next SCR and also resets the
S bit that was loaded to enable this section of the SCR segment.
Restrictions
Restrictions for using SCRs follow:
You cannot use the same S bit in more than one routine. For example, if you
use S0.1 in the main program, do not use it in the subroutine.
You cannot use the JMP and LBL instructions in an SCR segment. This means
that jumps into, within, or out of an SCR segment are not allowed. You can use
jump and label instructions to jump around SCR segments.
You cannot use the FOR, NEXT, and END instructions in an SCR segment.
9-154
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
SCR Example
Figure 9-58 shows an example of the operation of SCRs.
In this example, the first scan bit SM0.1 is used to set S0.1, which will be the
active State 1 on the first scan.
After a 2-second delay, T37 causes a transition to State 2. This transition
deactivates the State 1 SCR (S0.1) segment and activates the State 2 SCR
(S0.2) segment.
LAD
Network 1
SM0.1
Network 2
S0.1
S
1
S0.1
SCR
Network 3
SM0.0
Q0.4
S
1
Q0.5
R
2
T37
IN TON
20
Network 4
T37
STL
On the first scan,
enable State 1.
Network 1
LD
SM0.1
S
S0.1, 1
Beginning of State 1
control region
Network 2
LSCR
S0.1
Turn on the red light on
First Street.
Turn off the yellow and
green lights on First
Street.
Network 3
LD
SM0.0
S
Q0.4, 1
R
Q0.5, 2
TON
T37, 20
Start a 2-second timer.
PT
S0.2
SCRT
Transition to State 2
after a 2-second delay.
Network 5
SCRE
End of SCR region for
State 1
Network 4
LD
T37
SCRT
S0.2
Network 5
SCRE
(Program continued on next page)
Figure 9-58
Example of Sequence Control Relays (SCRs)
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-155
SIMATIC Instructions
LAD
STL
S0.2
SCR
Network 6
Network 7
SM0.0
Q0.2
S
1
IN
250
Network 8
T38
Turn on the green light
on Third Street.
T38
TON
Network 7
LD
SM0.0
S
Q0.2, 1
TON
T38, 250
Start a 25-second timer.
PT
S0.3
SCRT
Transition to State 3
after a 25-second delay.
Network 9
End of SCR region for
State 2
SCRE
.
.
.
FBD
Network 1
Network 6
LSCR
S0.2
Beginning of State 2
control region
Network 8
LD
T38
SCRT
S0.3
Network 9
SCRE
.
.
.
S0.1
SM0.1
1
Network 2
On the first scan,
enable State 1.
S
EN
N
Beginning of State 1
control region
S0.1
SCR
Network 3
Q0.4
SM0.0
AND
EN
1
SM0.0
S
Turn on the red light on
First Street.
R
Turn off the yellow and
green lights on First
Street.
N
Q0.5
EN
2
N
IN
20
PT
T37
TON
Start a 2-second timer.
Network 4
T37
S0.2
SCRT
Transition to State 2
after a 2-second delay.
Figure 9-58 Example of Sequence Control Relays (SCRs), continued
9-156
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
FBD
Network 5
End of SCR region for
State 1
SCRE
Network 6
S0.2
SCRT
SCR
Beginning of State 2
control region
Network 7
Q0.2
SM0.0
AND
SM0.0
S
EN
1
N
IN
250
Turn on the green light
on Third Street.
T38
TON
Start a 25-second timer.
PT
Network 8
T38
S0.3
SCRT
SCRT
Transition to State 3
after a 25-second delay.
Network 9
End of SCR region for
State 2
SCRE
Figure 9-58 Example of Sequence Control Relays (SCRs), continued
Divergence Control
In many applications, a single stream of sequential states must be split into two or
more different streams. When a stream of control diverges into multiple streams,
all outgoing streams must be activated simultaneously. This is shown in
Figure 9-59.
State L
Transition Condition
State M
Figure 9-59
State N
Divergence of Control Stream
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-157
SIMATIC Instructions
The divergence of control streams can be implemented in an SCR program by
using multiple SCRT instructions enabled by the same transition condition, as
shown in Figure 9-60.
LAD
S3.4
SCR
Network
STL
Beginning of State L
control region
Network
...
Network
LSCR
S3.4
Network
. . .
Network
M2.3
I2.1
S3.5
SCRT
Transition to State M
S6.5
SCRT
Transition to State N
SCRE
End of SCR region for
State L
Network
Network
LD
M2.3
A
I2.1
SCRT
S3.5
SCRT
S6.5
Network
SCRE
FBD
Network
S3.4
SCR
Network
M2.3
AND
I2.1
S3.5
SCRT
S6.5
SCRT
Network
SCRE
Figure 9-60
9-158
Example of Divergence of Control Streams
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Convergence Control
A similar situation arises when two or more streams of sequential states must be
merged into a single stream. When multiple streams merge into a single stream,
they are said to converge. When streams converge, all incoming streams must be
complete before the next state is executed. Figure 9-61 depicts the convergence of
two control streams.
State L
State M
Transition Condition
State N
Figure 9-61
Convergence of Control Streams
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-159
SIMATIC Instructions
The convergence of control streams can be implemented in an SCR program by
making the transition from state L to state L’ and by making the transition from
state M to state M’. When both SCR bits representing L’ and M’ are true, state N
can the enabled as shown in Figure 9-62.
LAD
Network
S3.4
SCR
STL
Beginning of State L
control region.
Network
LSCR
S3.4
Network
. . .
Network
...
Network
V100.5
S3.5
SCRT
Transition to State L’.
Network
LD
V100.5
SCRT
S3.5
SCRE
End of SCR region for
State L.
Network
SCRE
Beginning of State M
control region.
Network
LSCR
S6.4
Network
Network
S6.4
SCR
Network
. . .
Network
...
Network
C50
S6.5
SCRT
Transition to State M’.
Network
LD
C50
SCRT
S6.5
SCRE
End of SCR region for
State M.
Network
SCRE
S5.0
S
1
Enable State N.
S3.5
R
1
Reset State L’.
S6.5
R
1
Reset State M’.
Network
Network
S3.5
Figure 9-62
9-160
S6.5
Network
LD
S3.5
A
S6.5
S
S5.0, 1
R
S3.5, 1
R
S6.5, 1
Example of Convergence of Control Streams
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
FBD
Network
S3.4
SCR
Beginning of State L
control region.
Network
V100.5
S3.5
SCRT
Transition to State L’.
Network
End of SCR region for
State L.
SCRE
Network
Network
C50
S6.4
SCR
Beginning of State M
control region.
S6.5
SCRT
Transition to State M’.
Network
SCRE
End of SCR region for
State M.
Network
S5.0
AND
EN
S3.5
S6.5
1
S
Enable State N.
N
S3.5
EN
1
R
Reset State L’.
N
S6.5
EN
1
R
Reset State M’.
N
Figure 9-62 Example of Convergence of Control Streams, continued
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-161
SIMATIC Instructions
In other situations, a control stream may be directed into one of several possible
control streams, depending upon which transition condition comes true first. Such
a situation is depicted in Figure 9-63.
State L
Transition Condition
Transition Condition
State M
Figure 9-63
State N
Divergence of Control Stream, Depending on Transition Condition
An equivalent SCR program is shown in Figure 9-64.
LAD
Network
S3.4
SCR
STL
Beginning of State L
control region.
Network
Network
. . .
...
Network
M2.3
Network
I3.3
Transition to State M.
Network
LD
M2.3
SCRT
S3.5
S6.5
SCRT
Transition to State N.
Network
LD
I3.3
SCRT
S6.5
SCRE
End of SCR region for
State L.
S3.5
SCRT
Network
Figure 9-64
9-162
Network
LSCR
S3.4
Network
SCRE
Example of Conditional Transitions
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
FBD
Network
S3.4
SCR
Beginning of State L
control region.
Network
M2.3
S3.5
SCRT
Transition to State M.
Network
I3.3
S6.5
SCRT
Transition to State N.
Network
SCRE
End of SCR region for
State L.
Figure 9-64 Example of Conditional Transitions (continued)
S7-200 Programmable Controller System Manual
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9-163
SIMATIC Instructions
ENO
S
T
L
AENO
3
221
3
3
222
224
ENO is a Boolean output for boxes in LAD and FBD. If a
box has power flow at the EN input and is executed
without error, the ENO output passes power flow to the
next element. ENO can be used as an enable bit that
indicates the successful completion of an
instruction.
The ENO bit is used with the top of stack to affect power
flow for execution of subsequent instructions.
STL instructions do not have an EN input; the top of the
stack must be a logic 1 for the instruction to be executed.
In STL there is no ENO output, but the STL instructions
that correspond to LAD and FBD instructions with ENO
outputs do set a special ENO bit. This bit is accessible
with the And ENO (AENO) instruction. AENO can be
used to generate the same effect as the ENO bit of a
box. The AENO instruction is only available in STL.
AENO will perform a logical AND of the ENO bit and the
top of stack. The result of the AND operation is the new
top of stack.
9-164
Operands:
None
Data Types:
None
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
9.16
SIMATIC Interrupt and Communications Instructions
Attach Interrupt, Detach Interrupt
L
A
D
ATCH
EN ENO
F
B
D
INT
EVNT
DTCH
EN ENO
The Attach Interrupt instruction associates an interrupt
event (EVNT) with an interrupt routine number (INT), and
enables the interrupt event.
The Detach Interrupt instruction disassociates an
interrupt event (EVNT) from all interrupt routines, and
disables the interrupt event.
Attach Interrupt: Error conditions that set ENO = 0:
SM4.3 (run-time), 0006 (indirect address)
EVNT
S
T
L
ATCH INT, EVENT
DTCH EVENT
3
221
3
222
3
224
Inputs/Outputs
Operands
Data Types
INT
Constant (CPU 222: 0-12, 19-23, 27-33; CPU 224: 0-23, 27-33)
BYTE
EVNT
Constant (CPU 222: 0-12, 19-23, 27-33; CPU 224: 0-23, 27-33)
BYTE
Understanding Attach and Detach Interrupt Instructions
Before an interrupt routine can be invoked, an association must be established
between the interrupt event and the program segment that you want to execute
when the event occurs. Use the Attach Interrupt instruction (ATCH) to associate an
interrupt event (specified by the interrupt event number) and the program segment
(specified by an interrupt routine number). You can attach multiple interrupt events
to one interrupt routine, but one event cannot be concurrently attached to multiple
interrupt routines. When an event occurs with interrupts enabled, only the last
interrupt routine attached to this event is executed.
When you attach an interrupt event to an interrupt routine, that interrupt is
automatically enabled. If you disable all interrupts using the global disable interrupt
instruction, each occurrence of the interrupt event is queued until interrupts are
re-enabled, using the global enable interrupt instruction.
You can disable individual interrupt events by breaking the association between the
interrupt event and the interrupt routine with the Detach Interrupt instruction
(DTCH). The Detach instruction returns the interrupt to an inactive or ignored state.
Table 9-20 lists the different types of interrupt events.
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SIMATIC Instructions
Table 9-20 Interrupt Events
Event Number
9-166
Interrupt Description
CPU 221
CPU 222
CPU 224
0
Rising edge, I0.0
Y
Y
Y
1
Falling edge, I0.0
Y
Y
Y
2
Rising edge, I0.1
Y
Y
Y
3
Falling edge, I0.1
Y
Y
Y
4
Rising edge, I0.2
Y
Y
Y
5
Falling edge, I0.2
Y
Y
Y
6
Rising edge, I0.3
Y
Y
Y
7
Falling edge, I0.3
Y
Y
Y
8
Port 0: Receive character
Y
Y
Y
9
Port 0: Transmit complete
Y
Y
Y
10
Timed interrupt 0, SMB34
Y
Y
Y
11
Timed interrupt 1, SMB35
Y
Y
Y
12
HSC0 CV=PV (current value = preset value)
Y
Y
Y
13
HSC1 CV=PV (current value = preset value)
Y
14
HSC1 direction changed
Y
15
HSC1 external reset
Y
16
HSC2 CV=PV (current value = preset value)
Y
17
HSC2 direction changed
Y
18
HSC2 external reset
Y
19
PLS0 pulse count complete interrupt
Y
Y
Y
20
PLS1 pulse count complete interrupt
Y
Y
Y
21
Timer T32 CT=PT interrupt
Y
Y
Y
22
Timer T96 CT=PT interrupt
Y
Y
Y
23
Port 0: Receive message complete
Y
Y
Y
24
Port 1: Receive message complete
25
Port 1: Receive character
26
Port 1: Transmit complete
27
HSC0 direction changed
Y
Y
Y
28
HSC0 external reset
Y
Y
Y
29
HSC4 CV=PV (current value = preset value)
Y
Y
Y
30
HSC4 direction changed
Y
Y
Y
31
HSC4 external reset
Y
Y
Y
32
HSC3 CV=PV (current value = preset value)
Y
Y
Y
33
HSC5 CV=PV (current value = preset value)
Y
Y
Y
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Return from Interrupt
L
A
D
RETI
The Conditional Return from Interrupt instruction may
be used to return from an interrupt, based upon the
condition of the preceding logic. To add an interrupt,
select Edit Insert Interrupt from the menu.
Operands:
None
Data Types: None
F
B
D
RETI
S
T
L
The Return from Interrupt routines are identified by
separate program tabs in the STEP 7-Micro/WIN 32
screen.
CRETI
3
221
3
222
3
224
Interrupt Routines
The interrupt routine is executed in response to an associated internal or external
event. Once the last instruction of the interrupt routine has been executed, control
is returned to the main program. You can exit the routine by executing a conditional
return from interrupt instruction (CRETI).
Interrupt Use Guidelines
Interrupt processing provides quick reaction to special internal or external events.
You should optimize interrupt routines to perform a specific task, and then return
control to the main routine. By keeping the interrupt routines short and to the point,
execution is quick and other processes are not deferred for long periods of time. If
this is not done, unexpected conditions can cause abnormal operation of
equipment controlled by the main program. For interrupts, the axiom, ‘‘the shorter,
the better,’’ is definitely true.
Restrictions
You cannot use the DISI, ENI, HDEF, LSCR, and END instructions in an interrupt
routine.
System Support for Interrupt
Because contact, coil, and accumulator logic may be affected by interrupts, the
system saves and reloads the logic stack, accumulator registers, and the special
memory bits (SM) that indicate the status of accumulator and instruction
operations. This avoids disruption to the main user program caused by branching
to and from an interrupt routine.
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SIMATIC Instructions
Calling Subroutine From Interrupt Routines
You can call one nesting level of subroutines from an interrupt routine. The
accumulators and the logic stack are shared between an interrupt routine and a
subroutine that is called.
Sharing Data Between the Main Program and Interrupt Routines
You can share data between the main program and one or more interrupt routines.
For example, a part of your main program may provide data to be used by an
interrupt routine, or vice versa. If your program is sharing data, you must also
consider the effect of the asynchronous nature of interrupt events, which can occur
at any point during the execution of your main program. Problems with the
consistency of shared data can result due to the actions of interrupt routines when
the execution of instructions in your main program is interrupted by interrupt
events.
There are a number of programming techniques you can use to ensure that data is
correctly shared between your main program and interrupt routines. These
techniques either restrict the way access is made to shared memory locations, or
prevent interruption of instruction sequences using shared memory locations.
For an STL program that is sharing a single variable: If the shared data is a
single byte, word, or double-word variable and your program is written in STL,
then correct shared access can be ensured by storing the intermediate values
from operations on shared data only in non-shared memory locations or
accumulators.
For a LAD program that is sharing a single variable: If the shared data is a
single byte, word, or double-word variable and your program is written in LAD,
then correct shared access can be ensured by establishing the convention that
access to shared memory locations be made using only Move instructions
(MOVB, MOVW, MOVD, MOVR). While many LAD instructions are composed
of interruptible sequences of STL instructions, these Move instructions are
composed of a single STL instruction whose execution cannot be affected by
interrupt events.
For an STL or LAD program that is sharing multiple variables: If the shared data
is composed of a number of related bytes, words, or double-words, then the
interrupt disable/enable instructions (DISI and ENI) can be used to control
interrupt routine execution. At the point in your main program where operations
on shared memory locations are to begin, disable the interrupts. Once all
actions affecting the shared locations are complete, re-enable the interrupts.
During the time that interrupts are disabled, interrupt routines cannot be
executed and therefore cannot access shared memory locations; however, this
approach can result in delayed response to interrupt events.
9-168
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SIMATIC Instructions
Enable Interrupt, Disable Interrupt
L
A
D
ENI
The Enable Interrupt instruction globally enables
processing of all attached interrupt events.
DISI
The Disable Interrupt instruction globally disables
processing of all interrupt events.
Operands:
F
B
D
ENI
DISI
S
T
L
ENI
None
Data Types: None
When you make the transition to the RUN mode,
interrupts are initially disabled. Once in RUN mode, you
can enable all interrupts by executing the global Enable
Interrupt instruction. The global Disable Interrupt
instruction allows interrupts to be queued, but does not
allow the interrupt routines to be invoked.
DISI
3
221
3
222
3
224
Communication Port Interrupts
The serial communications port of the programmable logic controller can be
controlled by the LAD or STL program. This mode of operating the
communications port is called Freeport mode. In Freeport mode, your program
defines the baud rate, bits per character, parity, and protocol. The receive and
transmit interrupts are available to facilitate your program-controlled
communications. Refer to the transmit/receive instructions for more information.
I/O Interrupts
I/O interrupts include rising/falling edge interrupts, high-speed counter interrupts,
and pulse train output interrupts. The CPU can generate an interrupt on rising
and/or falling edges of an input. See Table 9-21 for the inputs available for the
interrupts. The rising edge and the falling edge events can be captured for each of
these input points. These rising/falling edge events can be used to signify a
condition that must receive immediate attention when the event happens.
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9-169
SIMATIC Instructions
Table 9-21 Rising/Falling Edge Interrupts Supported
I/O Interrupts
S7-200 CPU
I/O Points
I0.0 to I0.3
The high-speed counter interrupts allow you to respond to conditions such as the
current value reaching the preset value, a change in counting direction that might
correspond to a reversal in the direction in which a shaft is turning, or an external
reset of the counter. Each of these high-speed counter events allows action to be
taken in real time in response to high-speed events that cannot be controlled at
programmable logic controller scan speeds.
The pulse train output interrupts provide immediate notification of completion of
outputting the prescribed number of pulses. A typical use of pulse train outputs is
stepper motor control.
You can enable each of the above interrupts by attaching an interrupt routine to the
related I/O event.
9-170
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SIMATIC Instructions
Time-Based Interrupts
Time-based interrupts include timed interrupts and the Timer T32/T96 interrupts.
The CPU can support timed interrupts. You can specify actions to be taken on a
cyclic basis using a timed interrupt. The cycle time is set in 1-ms increments from
1 ms to 255 ms. You must write the cycle time in SMB34 for timed interrupt 0, and
in SMB35 for timed interrupt 1.
The timed interrupt event transfers control to the appropriate interrupt routine each
time the timer expires. Typically, you use timed interrupts to control the sampling of
analog inputs at regular intervals or to execute a PID loop at a timed interrupt.
A timed interrupt is enabled and timing begins when you attach an interrupt routine
to a timed interrupt event. During the attachment, the system captures the cycle
time value, so subsequent changes do not affect the cycle time. To change the
cycle time, you must modify the cycle time value, and then re-attach the interrupt
routine to the timed interrupt event. When the re-attachment occurs, the timed
interrupt function clears any accumulated time from the previous attachment, and
begins timing with the new value.
Once enabled, the timed interrupt runs continuously, executing the attached
interrupt routine on each expiration of the specified time interval. If you exit the
RUN mode or detach the timed interrupt, the timed interrupt is disabled. If the
global disable interrupt instruction is executed, timed interrupts continue to occur.
Each occurrence of the timed interrupt is queued (until either interrupts are
enabled, or the queue is full). See Figure 9-66 for an example of using a timed
interrupt.
The timer T32/T96 interrupts allow timely response to the completion of a specified
time interval. These interrupts are only supported for the 1-ms resolution on-delay
(TON) and off-delay (TOF) timers T32 and T96. The T32 and T96 timers otherwise
behave normally. Once the interrupt is enabled, the attached interrupt routine is
executed when the active timer’s current value becomes equal to the preset time
value during the normal 1-ms timer update performed in the CPU. You enable
these interrupts by attaching an interrupt routine to the T32/T96 interrupt events.
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9-171
SIMATIC Instructions
Understanding the Interrupt Priority and Queuing
Interrupts are prioritized according to the fixed priority scheme shown below:
Communication (highest priority)
I/O interrupts
Time-based interrupts (lowest priority)
Interrupts are serviced by the CPU on a first-come-first-served basis within their
respective priority assignments. Only one user-interrupt routine is ever being
executed at any point in time. Once the execution of an interrupt routine begins,
the routine is executed to completion. It cannot be pre-empted by another interrupt
routine, even by a higher priority routine. Interrupts that occur while another
interrupt is being processed are queued for later processing.
The three interrupt queues and the maximum number of interrupts they can store
are shown in Table 9-22.
Table 9-22 Interrupt Queues and Maximum Number of Entries per Queue
Queue
CPU 221
CPU 222
CPU 224
Communications queue
4
4
4
I/O Interrupt queue
16
16
16
Timed Interrupt queue
8
8
8
Potentially, more interrupts can occur than the queue can hold. Therefore, queue
overflow memory bits (identifying the type of interrupt events that have been lost)
are maintained by the system. The interrupt queue overflow bits are shown in
Table 9-23. You should use these bits only in an interrupt routine because they are
reset when the queue is emptied, and control is returned to the main program.
Table 9-23 Special Memory Bit Definitions for Interrupt Queue Overflow Bits
Description (0 = no overflow, 1 = overflow)
9-172
SM Bit
Communication interrupt queue overflow
SM4.0
I/O interrupt queue overflow
SM4.1
Timed interrupt queue overflow
SM4.2
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Table 9-24 shows the interrupt event, priority, and assigned event number.
Table 9-24 Interrupt Events in Priority Order
Event Number
Interrupt Description
Priority Group
Priority
in Group
8
Port 0: Receive character
0
9
Port 0: Transmit complete
0
23
Port 0: Receive message complete
24
Port 1: Receive message complete
25
Port 1: Receive character
1
26
Port 1: Transmit complete
1
19
PTO 0 complete interrupt
0
20
PTO 1 complete interrupt
1
0
Rising edge, I0.0
2
2
Rising edge, I0.1
3
4
Rising edge, I0.2
4
6
Rising edge, I0.3
5
1
Falling edge, I0.0
6
3
Falling edge, I0.1
7
5
Falling edge, I0.2
8
7
Falling edge, I0.3
9
12
HSC0 CV=PV (current value = preset value)
10
27
HSC0 direction changed
Communications
(highest)
0
1
11
Discrete (middle)
28
HSC0 external reset
13
HSC1 CV=PV (current value = preset value)
13
14
HSC1 direction input changed
14
15
HSC1 external reset
15
16
HSC2 CV=PV
16
17
HSC2 direction changed
17
18
HSC2 external reset
18
32
HSC3 CV=PV (current value = preset value)
19
29
HSC4 CV=PV (current value = preset value)
20
30
HSC4 direction changed
21
31
HSC4 external reset
22
33
HSC5 CV=PV (current value = preset value)
23
10
Timed interrupt 0
0
11
Timed interrupt 1
21
Timer T32 CT=PT interrupt
22
Timer T96 CT=PT interrupt
S7-200 Programmable Controller System Manual
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12
1
Timed (lowest)
2
3
9-173
SIMATIC Instructions
Interrupt Examples
Figure 9-65 shows an example of the Interrupt Routine instructions.
LAD
STL
MAIN OB1
Network 1
ATCH
EN ENO
SM0.1
4
INT
0
EVNT
ENI
Network 2
DTCH
EN ENO
SM5.0
0
EVNT
Network 3
M5.0
DISI
On the first scan:
Define interrupt routine 4
to be a rising edge
interrupt routine for I0.0.
Network 1
LD
SM0.1
ATCH
4, 0
ENI
Globally enable
interrupts.
If an I/O error is detected,
disable the rising edge
interrupt for I0.0.
(This rung is optional.)
Disable all interrupts
when M5.0 is on.
Network 2
LD
SM5.0
DTCH
0
Network 3
LD
M5.0
DISI
.
.
.
.INTERRUPT 4
.
Network 1
SM5.0
RETI
I/0 rising edge interrupt
subroutine.
Conditional return based
on I/O error
Network 1
LD
SM5.0
CRETI
End of I0.0 rising edge
interrupt routine.
FBD
MAIN OB1
Network 1
ATCH
ENO
SM0.1
EN
4
INT
0
EVNT
ENI
Network 2
SM5.0
0
Network 3
DTCH
ENO
EN
EVNT
DISI
M5.0
INTERRUPT 4
Network 1
SM5.0
Figure 9-65
9-174
RETI
Example of Interrupt Instructions
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Figure 9-66 shows how to set up a timed interrupt to read the value of an analog
input.
LAD
STL
MAIN PROGRAM
Network 1
SM0.1
First scan memory bit:
Call Subroutine 0.
SBR0
Network 1
LD
SM0.1
CALL
0
SUBROUTINE 0
Network 1
SM0.0
Begin Subroutine 0.
MOV_B
EN ENO
100
IN OUT
SMB34
ATCH
EN ENO
0
10
Always on memory bit:
Set timed interrupt 0
interval to 100 ms.
Network 1
LD
SM0.0
MOVB 100, SMB34
Global Interrupt Enable
ATCH
Attach timed interrupt 0 to
Interrupt routine 0.
ENI
Begin Interrupt routine 0.
Network 1
LD
SM0.0
MOVW
AIW4, VW100
0, 10
INT
EVNT
ENI
INTERRUPT 0
Network 1
SM0.0
MOV_W
EN ENO
AIW4
IN OUT
Sample AIW4.
VW100
Terminate Interrupt routine.
FBD
MAIN PROGRAM
Network 1
SM0.1
SBR0
EN
SUBROUTINE 0
Network 1
SM0.0
100
ATCH
EN ENO
MOV_B
EN ENO
IN OUT
SMB34
0
10
ENI
INT
EVNT
INTERRUPT 0
Network 1
SM0.0
AIW4
Figure 9-66
MOV_W
EN ENO
IN OUT
VW100
Example of How to Set Up a Timed Interrupt to Read the Value of an Analog
Input
S7-200 Programmable Controller System Manual
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9-175
SIMATIC Instructions
Network Read, Network Write
L
A
D
NETR
EN
ENO
F
B
D
TBL
The Network Write instruction initiates a communication
operation to write data to a remote device through the
specified port (PORT), as defined by the table (TBL).
PORT
NETW
EN
ENO
TBL
PORT
S
T
L
The Network Read instruction initiates a communication
operation to gather data from a remote device through
the specified port (PORT), as defined by the table (TBL).
NETR
TABLE,PORT
NETW
TABLE,PORT
3
3
3
221
222
224
The NETR instruction can read up to 16 bytes of
information from a remote station, and the NETW
instruction can write up to 16 bytes of information to a
remote station. You may have any number of
NETR/NETW instructions in the program, but only a
maximum of eight NETR and NETW instructions may be
activated at any one time. For example, you can have
four NETRs and four NETWs, or two NETRs and six
NETWs active at the same time in a given S7-200.
Figure 9-67 defines the table that is referenced by the
TBL parameter in the NETR and NETW instructions.
NETR: Error conditions that set ENO = 0:
SM4.3 (run-time), 0006 (indirect address)
NETW: Error conditions that set ENO = 0:
SM4.3 (run-time), 0006 (indirect address)
Inputs/Outputs
Operands
Data Types
TBL
I, Q, M, S, V, VB, MB, *VD, *AC, *LD
BYTE
PORT
Constant
BYTE
9-176
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SIMATIC Instructions
Byte
Offset
0
D Done (function has been completed):
A Active (function has been queued):
E Error (function returned an error):
7
0 = not done
0 = not active
0 = no error
1 = done
1 = active
1 = error
0
D
A
E
0
Error code
1
Remote station address
2
Pointer to the data
3
area in the
4
remote station
5
(I, Q, M, or V)
6
Data length
7
Data byte 0
8
Data byte 1
22
Data byte 15
Remote station address: the address of the PLC whose data is
to be accessed.
Pointer to the data area in the remote station: an indirect
pointer to the data that is to be accessed.
Data length: the number of bytes of data that is to be accessed
in the remote station (1 to 16 bytes).
Receive or transmit data area: 1 to 16 bytes reserved for the
data, as described below:
For NETR, this data area is where the values that are read
from the remote station are stored after execution of the
NETR.
For NETW, this data area is where the values to be sent to
the remote station are stored before execution of the NETW.
Error Code
Definition
0
1
2
3
4
5
6
7
8
9
A-F
No error
Time-out error; remote station not responding
Receive error; parity, framing or checksum error in the response
Offline error; collisions caused by duplicate station addresses or failed hardware
Queue overflow error; more than eight NETR/NETW boxes have been activated
Protocol violation; attempt execute NETR/NETW without enabling PPI+ in SMB30
Illegal parameter; the NETR/NETW table contains an illegal or invalid value
No resource; remote station is busy (upload or download sequence in process)
Layer 7 error; application protocol violation
Message error; wrong data address or incorrect data length
Not used; (reserved for future use)
Figure 9-67
Definition of TABLE for NETR and NETW
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9-177
SIMATIC Instructions
Example of Network Read and Network Write
Figure 9-68 shows an example to illustrate the utility of the NETR and NETW
instructions. For this example, consider a production line where tubs of butter are
being filled and sent to one of four boxing machines (case packers). The case
packer packs eight tubs of butter into a single cardboard box. A diverter machine
controls the flow of butter tubs to each of the case packers. Four CPU 221
modules are used to control the case packers and a CPU 222 module equipped
with a TD 200 operator interface is used to control the diverter. Figure 9-68 shows
the network setup.
TD 200
Station 1
Case
Packer #1
CPU 221
Station 2
VB100
Control
VW101
Status
VB100
Case
Packer #2
CPU 221
Station 3
VB100
Control
VW101
Status
f e e e 0 g b
VB101
Number of
VB102
cases packed
Case
Packer #3
CPU 221
Station 4
t
Case
Packer #4
CPU 221
Station 5
VB100
Control
VW101
Status
VB100
Control
VW101
Status
VB200
Rcv
Buffers
VB300
Xmt
Buffers
VB200
Receive buffer
Station 2
VB300
Transmit buffer
Station 2
VB210
Receive buffer
Station 3
VB310
Transmit buffer
Station
VB221
Receive buffer
Station 4
VB320
Transmit buffer
Station 4
VB230
Receive buffer
Station 5
VB330
Transmit buffer
Station
Control
Status
MSB
Diverter
CPU 222
Station 6
LSB
f
fault indicator; f=1, the case packer has detected an error
g
glue supply is low; g=1, must add glue in the next 30 minutes
b
box supply is low; b=1, must add boxes in the next 30 minutes
t
out of butter tubs to pack; t=1, out of butter tubs
eee error code identifying the type of fault experienced
Figure 9-68
9-178
Example of NETR and NETW Instructions
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C79000-G7076-C233-01
SIMATIC Instructions
The receive and transmit buffers for accessing the data in station 2 (located at
VB200 and VB300, respectively) are shown in detail in Figure 9-69.
The CPU 224 uses a NETR instruction to read the control and status information
on a continuous basis from each of the case packers. Each time a case packer
has packed 100 cases, the diverter notes this and sends a message to clear the
status word using a NETW instruction.
The program required to read the control byte, the number of cases packed and to
reset the number of cases packed for a single case packer (case packer #1) is
shown in Figure 9-70.
Diverter’s Receive Buffer
for reading from Case Packer #1
7
VB200
D
Diverter’s Transmit Buffer
for clearing the count of Case Packer #1
0
A
E
0
Error code
7
VB300
D
0
A
E
0
Error Code
VB201
Remote station address
VB301
Remote station address
VB202
Pointer to the
VB302
Pointer to the
VB203
data area
VB303
data area
VB204
in the
VB304
in the
VB205
Remote station = (&VB100)
VB305
Remote station = (&VB101)
VB206
Data length = 3 bytes
VB306
Data length = 2 bytes
VB207
Control
VB307
0
VB208
Status (MSB)
VB308
0
VB209
Status (LSB)
Figure 9-69
Sample TABLE Data for NETR and NETW Example
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-179
SIMATIC Instructions
LAD
Network 1
SM0.1
Network 2
V200.7 VW20
8==I
100
2
MOV_B
EN ENO
IN OUT
0
68
FILL_N
EN ENO
IN OUT
N
MOV_B
EN ENO
2
IN OUT
MOV_D
EN ENO
&VB101 IN OUT
STL
SMB30
VW200
IN OUT
IN OUT
NETW
EN ENO
VB300
0
Network 3
V200.7
TBL
PORT
MOV_B
EN ENO
VB207
IN OUT
/
/
MOV_B
EN ENO
/
2
IN OUT
MOV_D
EN ENO
VB306
3
Reset the number
of cases packed by
case packer #1.
When the Done
bit is set, save the
control data from
VB400 case packer #1.
Figure 9-70
9-180
When the NETR
is not active and
there is no error,
VB201 load the station
address of case
packer #1.
Load a pointer to
IN OUT
VB206 the data to be
VB200 TBL
0 PORT
Network 2
LD
V200.7
AW=
VW208, 100
MOVB
2, VB301
MOVD
&VB101, VD302
MOVB
2, VB306
MOVW
0, VW307
NETW
VB300, 0
VW307
VD202 the data in the
NETR
EN ENO
0, VW200, 68
Load the data to
be transmitted.
OUT
MOV_B
EN ENO
&VB100 IN
FILL
Load the length of
the data to be
transmitted.
Network 4
SM0.1 V200.6 V200.5
Network 1
LD
SM0.1
MOVB
2, SMB30
VD302
MOV_W
EN ENO
0
Clear all receive
and transmit
buffers.
When the NETR
Done bit is set and
100 cases have
been packed, load
station address
VB301 the
of case packer #1.
Load a pointer to
the data in the
remote station.
MOV_B
EN ENO
2
On the first scan,
enable the PPI+
protocol.
remote station.
Network 3
LD
V200.7
MOVB
VB207, VB400
Network 4
LDN
SM0.1
AN
V200.6
AN
V200.5
MOVB
2, VB201
MOVD
MOVB
NETR
&VB100, VD202
3, VB206
VB200, 0
Load the length of
received.
Read the control
and status data in
case packer #1.
Example of NETR and NETW Instructions for LAD and STL
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
FBD
Network 1
MOV_B
EN ENO
IN OUT
SM0.1
2
FILL_N
EN ENO
0
IN OUT
68 N
SMB30
VW200
Network 2
AND
==I
V200.7
SM0.0
VW208
100
2
MOV_B
EN ENO
2
IN
OUT
MOV_B
EN ENO
IN OUT
MOV_D
EN ENO
VB301 &VB101 IN OUT
MOV_W
EN ENO
VB306 0
IN
OUT
VD302
NETW
EN ENO
VW307 VB300
Network 3
TBL
0 PORT
V200.7
VB207
MOV_B
EN ENO
IN
OUT
VB400
Network 4
2 IN
V200.6
V200.5
3
Figure 9-71
MOV_B
EN ENO
IN OUT
MOV_D
EN ENO
MOV_B
EN ENO
AND
SM0.1
VB206
OUT
VB201 &VB101 IN
VB200
0
OUT
VD202
NETR
EN ENO
TBL
PORT
Example of NETR and NETW instructions for FBD
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-181
SIMATIC Instructions
Transmit, Receive
L
A
D
XMT
EN
ENO
F
B
D
TBL
The Transmit instruction invokes the transmission of the
data buffer (TBL). The first entry in the data buffer
specifies the number of bytes to be transmitted. PORT
specifies the communication port to be used for
transmission.
PORT
RCV
EN
ENO
The XMT instruction is used in Freeport mode to transmit
data by means of the communication port(s).
The format of the XMT buffer is:
TBL
PORT
S
T
L
XMT TABLE, PORT
RCV TABLE, PORT
3
3
221
222
3
224
The Receive instruction initiates or terminates the
Receive Message service. You must specify a start and
an end condition for the Receive box to operate.
Messages received through the specified port (PORT)
are stored in the data buffer (TBL). The first entry in the
data buffer specifies the number of bytes received.
Transmit: Error conditions that set ENO = 0: SM4.3
(run-time), 0006 (indirect address),
0009 (simultaneous XMT/RCV on port 0),
000B (simultaneous XMT/RCV on port 1)
Receive: Error conditions that set ENO = 0: SM86.6 and SM186.6 (RCV
parameter error), SM4.3 (run-time), 0006 (indirect address), 0009 (simultaneous
XMT/RCV on port 0), 000B (simultaneous XMT/RCV on port 1)
Inputs/Outputs
TABLE
Operands
VB, IB, QB, MB, SB, SMB,
Data Types
BYTE
*VD, *AC, *LD
PORT
9-182
Constant (0)
BYTE
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Understanding Freeport Mode
You can select the Freeport mode to control the serial communication port of the
CPU by means of the user program. When you select Freeport mode, the LAD
program controls the operation of the communication port through the use of the
receive interrupts, the transmit interrupts, the transmit instruction (XMT), and the
receive instruction (RCV). The communication protocol is entirely controlled by the
ladder program while in Freeport mode. SMB30 (for port 0) and SMB130 (for port 1
if your CPU has two ports) are used to select the baud rate and parity.
The Freeport mode is disabled and normal communication is re-established (for
example, programming device access) when the CPU is in the STOP mode.
In the simplest case, you can send a message to a printer or a display using only
the Transmit (XMT) instruction. Other examples include a connection to a bar code
reader, a weighing scale, and a welder. In each case, you must write your program
to support the protocol that is used by the device with which the CPU
communicates while in Freeport mode.
Freeport communication is possible only when the CPU is in the RUN mode.
Enable the Freeport mode by setting a value of 01 in the protocol select field of
SMB30 (Port 0) or SMB130 (Port 1). While in Freeport mode, communication with
the programming device is not possible.
Note
Entering Freeport mode can be controlled using special memory bit SM0.7, which
reflects the current position of the operating mode switch. When SM0.7 is equal to
0, the switch is in TERM position; when SM0.7 = 1, the operating mode switch is
in RUN position. If you enable Freeport mode only when the switch is in RUN
position, you can use the programming device to monitor or control the CPU
operation by changing the switch to any other position.
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-183
SIMATIC Instructions
Freeport Initialization
SMB30 and SMB130 configure the communication ports, 0 and 1, respectively, for
Freeport operation and provide selection of baud rate, parity, and number of data
bits. The Freeport control byte(s) description is shown in Table 9-25.
Table 9-25 Special Memory Bytes SMB30 and SMB130
Port 0
Port 1
Format of
SMB30
Format of
SMB130
Description
MSB
7
p
LSB
0
p
d
b
b
b m m
Freeport mode control byte
SM30.6
and
SM30.7
SM130.6
and
SM130.7
pp
Parity select
00 = no parity
01 = even parity
10 = no parity
11 =
odd parity
SM30.5
SM130.5
d
Data bits per character
0=
8 bits per character
1=
7 bits per character
SM30.2 to
SM30.4
SM130.2
to
SM130.4
bbb
Freeport Baud rate
000 = 38,400 baud
001 = 19,200 baud
010 = 9,600 baud
011 = 4,800 baud
100 = 2,400 baud
101 = 1,200 baud
110 = 600 baud
111 = 300 baud
SM30.0
and
SM30.1
SM130.0
and
SM130.1
mm
Protocol selection
00 = Point-to-Point Interface protocol (PPI/slave mode)
01 = Freeport protocol
10 = PPI/master mode
11 =
Reserved (defaults to PPI/slave mode)
Note: One stop bit is generated for all configurations.
Using the XMT Instruction to Transmit Data
The XMT instruction lets you send a buffer of one or more characters, up to a
maximum of 255. An interrupt is generated (interrupt event 9 for port 0 and
interrupt event 26 for port 1) after the last character of the buffer is sent, if an
interrupt routine is attached to the transmit complete event. You can make
transmissions without using interrupts (for example, sending a message to a
printer) by monitoring SM4.5 or SM4.6 to signal when transmission is complete.
9-184
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
The XMT instruction can be used to generate a BREAK condition by setting the
number of characters to zero and then executing the XMT instruction. This
generates a BREAK condition on the line for 16-bit times at the current baud rate.
Transmitting a BREAK is handled in the same manner as transmitting any other
message, in that a XMT interrupt is generated when the BREAK is complete and
SM4.5 or SM4.6 signal the current status of the XMT.
The format of the XMT buffer is shown in Figure 9-72.
count
M
E
S
S
A
G
E
where: count the number of bytes to transmit (byte field)
M E ... the message characters
Figure 9-72
XMT Buffer Format
Using the RCV Instruction to Receive Data
The RCV instruction lets you receive a buffer of one or more characters, up to a
maximum of 255. An interrupt is generated (interrupt event 23 for port 0 and
interrupt event 24 for port 1) after the last character of the buffer is received, if an
interrupt routine is attached to the receive message complete event.
You can receive messages without using interrupts by monitoring SMB86. SMB86
(or SMB186) will be non-zero when the RCV box is inactive or has been
terminated. It will be zero when a receive is in progress.
The RCV instruction allows you to select the message start and message end
conditions. See Table 9-26 (SM86 through SM94 for port 0, and SM186 through
SM194 for port 1) for descriptions of the start and end message conditions.The
format of the RCV buffer is shown in Figure 9-73.
Note
The Receive Message function is automatically terminated by an overrun or a
parity error. You must define a start condition (x or z), and an end condition (y, t, or
maximum character count) for the Receive Message function to operate.
count
Figure 9-73
start
char
M
E
S
S
A
G
E
end
char
RCV Buffer Format
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-185
SIMATIC Instructions
Table 9-26 Special Memory Bytes SMB86 to SMB94, and SMB186 to SMB194
Port 0
Port 1
SMB86
SMB186
Description
MSB
7
n
LSB
0
r
e
0
0
t
c
p
Receive message status byte
n: 1 = Receive message terminated by user disable command
r: 1 = Receive message terminated: error in input parameters
or
missing start or end condition
e: 1 = End character received
t:
1 = Receive message terminated: timer expired
c: 1 = Receive message terminated: maximum character count
achieved
p
9-186
1 = Receive message terminated because of a parity error
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Table 9-26 Special Memory Bytes SMB86 to SMB94, and SMB186 to SMB194
Port 0
Port 1
SMB87
SMB187
Description
MSB
7
n
LSB
0
x
y
z m
t
0
0
Receive message control byte
n: 0 = Receive Message function is disabled.
1 = Receive Message function is enabled .
The enable/disable receive message bit is checked each time the
RCV instruction is executed.
x: 0 = Ignore SMB88 or SMB188.
1 = Use the value of SMB88 or SMB188 to detect start of
message.
y; 0 = Ignore SMB89 or SMB189.
1 = Use the value of SMB89 or SMB189 to detect end of
message.
z: 0 = Ignore SMW90 or SMB190.
1 = Use the value of SMW90 to detect an idle line condition.
m: 0 = Timer is an inter-character timer.
1 = Timer is a message timer.
t:
0 = Ignore SMW92 or SMW192.
1 = Terminate receive if the time period in SMW92 or SMW192
is exceeded.
The bits of the message interrupt control byte are used to define the
criteria by which the message is identified. Both start of message and
end of message criteria are defined. To determine the start of a
message, either of two sets of logically ANDed start of message
criteria must be true and must occur in sequence (idle line followed
by start character, or break followed by start character). To determine
the end of a message, the enabled end of the message criteria is
logically ORed. The equations for start and stop criteria are given
below:
Start of Message = il * sc + bk * sc
End of Message = ec + tmr + maximum character count
reached
Programming the start of message criteria for:
1. Idle line detection:
il=1, sc=0, bk=0, SMW90>0
2. Start character detection:
il=0, sc=1, bk=0, SMW90
is a don’t care
3. Break Detection:
il=0, sc=0, bk=1, SMW90
is a don’t care
4. Any response to a request:
il=1, sc=0, bk=0, SMW90=0
(Message timer can be used to terminate receive if there is no
response.)
5. Break and a start character:
il=0, sc=1, bk=1, SMW90
is a don’t care
6. Idle line and a start character:
il=1, sc=1, bk=0, SMW90 >0
7. Idle line and start character (Illegal): il=1, sc=1, bk=0, SMW90=0
Note: Receive will automatically be terminated by an overrun or a
parity error (if enabled).
SMB88
SMB188 Start of message character
SMB89
SMB189 End of message character
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-187
SIMATIC Instructions
Table 9-26 Special Memory Bytes SMB86 to SMB94, and SMB186 to SMB194
Port 0
Port 1
Description
SMB90
SMB91
SMB190 Idle line time period given in milliseconds. The first character received
SMB191 after idle line time has expired is the start of a new message. SM90
(or SM190) is the most significant byte and SM91 (or SM191) is the
least significant byte.
SMB92
SMB93
SMB192 Inter-character/message timer time-out value given in milliseconds. If
SMB193 the time period is exceeded, the receive message is terminated.
SM92 (or SM192) is the most significant byte, and SM93 (or SM193)
is the least significant byte.
SMB94
SMB194 Maximum number of characters to be received (1 to 255 bytes).
Note: This range must be set to the expected maximum buffer size,
even if the character count message termination is not used.
Using Character Interrupt Control to Receive Data
To allow complete flexibility in protocol support, you can also receive data using
character interrupt control. Each character received generates an interrupt. The
received character is placed in SMB2, and the parity status (if enabled) is placed in
SM3.0 just prior to execution of the interrupt routine attached to the receive
character event.
SMB2 is the Freeport receive character buffer. Each character received while in
Freeport mode is placed in this location for easy access from the user program.
SMB3 is used for Freeport mode and contains a parity error bit that is turned on
when a parity error is detected on a received character. All other bits of the byte
are reserved. Use this bit either to discard the message or to generate a
negative acknowledge to the message.
Note
SMB2 and SMB3 are shared between Port 0 and Port 1. When the reception of a
character on Port 0 results in the execution of the interrupt routine attached to that
event (interrupt event 8), SMB2 contains the character received on Port 0, and
SMB3 contains the parity status of that character. When the reception of a
character on Port 1 results in the execution of the interrupt routine attached to that
event (interrupt event 25), SMB2 contains the character received on Port 1 and
SMB3 contains the parity status of that character.
9-188
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Receive and Transmit Example
This sample program shows the use of Receive and Transmit. This program will
receive a string of characters until a line feed character is received. The message
is then transmitted back to the sender.
LAD
STL
MAIN (OB1)
Network 1
SM0.1
MOV_B
EN ENO
16#9 IN
OUT
MOV_B
EN ENO
16#B0 IN
OUT
MOV_B
EN ENO
16#A
IN
OUT
On the first scan:
- Initialize freeport
- Select 9600 baud
- Select 8 data bits
SMB30 - Select no parity
Initialize RCV message
control byte
- RCV enabled
- Detect end of message
character
SMB87
- Detect idle line condition
as message start
condition
Set end of message
character to hex 0A
SMB89 (line feed)
Set idle line timeout to
5 ms.
MOV_W
EN ENO
+5 IN
OUT
SMW90
Set maximum number of
characters to 100.
MOV_B
EN ENO
100
IN
OUT
ATCH
EN ENO
0
INT
23
EVNT
ATCH
EN ENO
1
INT
9
EVNT
EN
VB100
0
Figure 9-74
Network 1
LD
SM0.1
MOVB
16#9, SMB30
MOVB
16#B0, SMB87
MOVB
16#0A, SMB89
MOVW
+5, SMW90
MOVB
100, SMB94
ATCH
0, 23
ATCH
1, 9
ENI
RCV
VB100, 0
SMB94
Attach interrupt to
receive complete event.
Attach interrupt to
transmit complete event.
ENI
Enable user interrupts.
RCV
ENO
Enable receive box with
buffer at VB100 for port 0.
TBL
PORT
Example of Transmit Instruction
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-189
SIMATIC Instructions
INTERRUPT 0
Network 1
SMB86
MOV_B
EN ENO
==B
16#20
10
IN OUT
ATCH
EN ENO
1
INT
10
EVNT
RETI
RCV
EN ENO
NOT
VB100
0
Receive complete
interrupt.
SMB34
If receive status shows
receive of end character,
then attach a 10 ms timer
to trigger a transmit, then
return.
Network
LDB=
MOVB
ATCH
CRETI
NOT
RCV
1
SMB86, 16#20
10, SMB34
2, 10
VB100, 0
If receive complete for
any other reason, then
start a new receive.
TBL
PORT
INTERRUPT 1
Network 1
Timer interrupt.
DTCH
EN ENO
SM0.0
10
EVNT
XMT
EN ENO
VB100
0
Detach timer interrupt.
Network 1
LD
SM0.0
DTCH
10
XMT
VB100, 0
TBL
Transmit message back
to user on port 0.
PORT
INTERRUPT 2
Network 10
RCV
SM0.0
EN ENO
VB100
0
Figure 9-74
9-190
Transmit complete
interrupt.
Network 10
LD
SM0.0
RCV
VB100, 0
Enable another receive.
TBL
PORT
Example of Transmit Instruction (continued)
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
FBD
Network 1
MOV_B
EN ENO
SM0.1
16#9
IN
OUT
SMB30 16#B0 IN
MOV_W
EN ENO
+5
IN
OUT
MOV_B
EN ENO
MOV_B
EN ENO
OUT
SMB87
16#A
100
IN
OUT
OUT
SMB89
ATCH
EN ENO
MOV_B
EN ENO
SMW90
IN
SMB94
0
INT
23
EVNT
ATCH
EN
ENI
ENO
2
INT
9
EVNT
RCV
EN
VB100
ENO
TBL
0
PORT
INTERRUPT 0
Network 1
==B
SMB86
16#20
10
MOV_B
EN ENO
IN OUT
SMB34
1
10
ATCH
EN ENO
INT
RETI
EVNT
RCV
EN ENO
VB100
0
TBL
PORT
INTERRUPT 1
DTCH
SM0.0
10
XMT
EN ENO
EN ENO
EVNT
VB100
0
TBL
PORT
INTERRUPT 2
SM0.0
RCV
EN ENO
VB100
TBL
0
Figure 9-74
PORT
Example of Transmit Instruction (continued)
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-191
SIMATIC Instructions
9.17
SIMATIC Logic Stack Instructions
And Load
S
T
L
ALD
3
221
3
222
3
224
The And Load instruction combines the values in the
first and second levels of the stack using a logical And
operation. The result is loaded in the top of stack. After
the ALD is executed, the stack depth is decreased by
one.
Operands:
none
Or Load
S
T
L
OLD
3
221
3
222
3
224
The Or Load instruction combines the values in the first
and second levels of the stack, using a logical Or
operation. The result is loaded in the top of stack. After
the OLD is executed, the stack depth is decreased by
one.
Operands:
none
Logic Push
S
T
L
The Logic Push instruction duplicates the top value on
the stack and pushes this value onto the stack. The
bottom of the stack is pushed off and lost.
LPS
3
221
3
222
3
224
Operands:
none
Logic Read
S
T
L
LRD
3
221
3
222
3
The Logic Read instruction copies the second stack
value to the top of stack. The stack is not pushed or
popped, but the old top of stack value is destroyed by the
copy.
224
Operands:
9-192
none
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
Logic Pop
S
T
L
The Logic Pop instruction pops one value off of the
stack. The second stack value becomes the new top of
stack value.
LPP
3
221
3
222
3
Operands:
none
224
Load Stack
S
T
L
LDS
3
221
3
222
n
3
The Load Stack instruction duplicates the stack bit n on
the stack and places this value on top of the stack. The
bottom of the stack is pushed off and lost.
Operands:
n (1 to 8)
224
Logic Stack Operations
Figure 9-75 illustrates the operation of the And Load and Or Load instructions.
ALD
AND the top two stack values
Before
After
iv0
S0
iv1
OLD
OR the top two stack values
Before
After
iv0
S0
iv2
iv1
iv2
iv2
iv3
iv2
iv3
iv3
iv4
iv3
iv4
iv4
iv5
iv4
iv5
iv5
iv6
iv5
iv6
iv6
iv7
iv6
iv7
iv7
iv8
iv7
iv8
iv8
x
iv8
x
S0 = iv0 AND iv1
S0 = iv0 OR iv1
Note: x means the value is unknown (it may be either a 0 or a 1).
Figure 9-75
And Load and Or Load Instructions
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-193
SIMATIC Instructions
Figure 9-76 illustrates the operation of the Logic Push, Logic Read, and Logic Pop
instructions.
LPS
Logic Push
LRD
Logic Read
LPP
Logic Pop
Before
iv0
After
iv0
Before
iv0
After
iv1
Before
iv0
After
iv1
iv1
iv0
iv1
iv1
iv1
iv2
iv2
iv3
iv1
iv2
iv2
iv3
iv2
iv3
iv2
iv3
iv3
iv4
iv4
iv3
iv4
iv4
iv4
iv5
iv5
iv4
iv5
iv5
iv5
iv6
iv6
iv5
iv6
iv6
iv6
iv7
iv7
iv6
iv7
iv7
iv7
iv8
iv8
iv7
iv8
iv8
iv8
x
Note: x means the value is unknown (it may be either a 0 or a 1).
Upon the LPS execution, iv8 is lost.
Figure 9-76
Logic Push, Logic Read, and Logic Pop Instructions
Figure 9-77 illustrates the operation of the Load Stack instructions.
LDS 3
Load Stack
Figure 9-77
Before
iv0
After
iv3
iv1
iv0
iv2
iv3
iv1
iv2
iv4
iv3
iv5
iv4
iv6
iv5
iv7
iv6
iv8
iv7
Load Stack Instructions
Logic Stack Example
9-194
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
SIMATIC Instructions
LAD
STL
Network 1
I0.0
I2.0
NETWORK 1
LD
I0.0
LD
I0.1
LD
I2.0
A
I2.1
OLD
ALD
=
Q5.0
Q5.0
I0.1
I2.1
Network 2
I0.0
I0.5
NETWORK 2
LD
I0.0
LPS
LD
I0.5
O
I0.6
ALD
=
Q7.0
LRD
LD
I2.1
O
I1.3
ALD
=
Q6.0
LPP
A
I1.0
=
Q3.0
Q7.0
I0.6
I2.1
Q6.0
I1.3
I1.0
Figure 9-78
Q3.0
Example of Logic Stack Instructions for LAD and STL
FBD
Network 1
AND
OR
AND
I2.0
I2.1
Q5.0
I0.0
I0.1
Network 2
AND
AND
I0.0
Q7.0
SM0.0
I0.5
OR
I0.6
AND
Q6.0
I2.1
OR
I1.3
AND
Q3.0
I1.0
Figure 9-79
Example of Logic Stack Instructions for FBD
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
9-195
SIMATIC Instructions
9-196
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
10
IEC 1131-3 Instructions
This chapter describes the standard IEC 1131-3 instructions. There are some
SIMATIC instructions that can be used in an IEC program. These instructions are
called non-standard IEC instructions, and are shown at the beginning of each
section.
Chapter Overview
Section
Description
Page
10.1
IEC Bit Logic Instructions
10-2
10.2
IEC Compare Instructions
10-7
10.3
IEC Timer Instructions
10-11
10.4
IEC Counter Instructions
10-15
10.5
IEC Math Instructions
10-19
10.6
IEC Move Instructions
10-24
10.7
IEC Logic Instructions
10-26
10.8
IEC Shift and Rotate Instructions
10-29
10.9
IEC Conversion Instructions
10-32
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
10-1
IEC 1131-3 Instructions
10.1
IEC Bit Logic
Table 10-1 gives page references for the non-standard IEC Bit Logic instructions.
Table 10-1 Non-Standard IEC Bit Logic Instructions
Description
Page
Standard Contacts
9-2
Immediate Contacts
9-3
Not Contact
9-4
Positive and Negative Transition
9-4
Output Contact
9-6
Output Immediate
9-6
Set and Reset (N Bits)
9-7
Standard Contacts (non-standard IEC 1131-3)
L
A
D
bit
bit
/
F
B
D
The Normally Open contact is closed (on) when the bit
value of address (bit) is equal to 1.
The Normally Closed contact is closed (on) when the bit
value of address (bit) is equal to 0.
These instructions obtain the referenced value from
memory or from the process image register if the
memory type is I or Q.
AND
OR
3
3
3
221
222
224
In LAD, normally open and normally closed instructions
are represented by contacts.
In FBD, normally open instructions are represented by
AND/OR boxes. These instructions can be used to
manipulate Boolean signals in the same manner as
ladder contacts. Normally closed instructions are also
represented by boxes. A normally closed instruction is
constructed by placing the negation symbol on the stem
of the input signal.
Inputs/Outputs
Operands
Data Types
bit
I, Q, M, SM, T, C, V, S, L
BOOL
Input (FBD)
I, Q, M, SM, T, C, V, S, L, Power Flow
BOOL
Output (FBD)
I, Q, M, SM, T, C, V, S, L, Power Flow
BOOL
10-2
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
IEC 1131-3 Instructions
Positive, Negative Transition
The Positive Transition contact allows power to flow for
one scan for each off-to-on transition.
L
A
D
P
The Negative Transition contact allows power to flow
for one scan, for each on-to-off transition.
N
F
B
D
In LAD, the Positive and Negative Transition instructions
are represented by contacts.
P
IN
OUT
In FBD, the instructions are represented by the POS and
NEG boxes.
N
IN
OUT
3
3
3
221
222
224
Inputs/Outputs
Operands
Data Types
IN (FBD)
I, Q, M, SM, T, C, V, S, L, Power Flow
BOOL
OUT (FBD)
I, Q, M, SM, T, C, V, S, L, Power Flow
BOOL
Contact Examples
LAD
FBD
Network 1
Network 1
%I0.0
AND
%I0.1
%Q0.0
%I0.0
%Q0.0
%I0.1
Network 2
%I0.0
%Q0.1
Network 2
NOT
%Q0.1
=
%I0.0
Network 3
%I0.1
%Q0.2
N
Network 3
N
%I0.1
IN
OUT
%Q0.2
Timing Diagram
I0.0
I0.1
Q0.0
Q0.1
On for one scan
Q0.2
Figure 10-1
Examples of Boolean Contact Instructions for LAD and FBD
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
10-3
IEC 1131-3 Instructions
Output
L
A
D
bit
When the Output is executed, the output is turned on.
In LAD, the Output instruction is represented by a coil.
In FBD, the instruction is represented by the = box.
bit
=
F
B
D
3
3
3
221
222
224
Inputs/Outputs
Operands
Data Types
bit (LAD/FBD)
I, Q, M, SM, T, C, V, S, L
BOOL
Input (LAD)
Power flow
BOOL
Input (FBD)
I, Q, M, SM, T, C, V, S, L, Power Flow
BOOL
Set, Reset
bit
S
L
A
D
When Set and Reset are executed, the value specified
by OUT is set or reset.
bit
R
F
B
D
bit
S
bit
R
3
3
3
221
222
224
Inputs/Outputs
Operands
Data Types
bit (LAD, FBD)
I, Q, M, SM, T, C, V, S, L
BOOL
Input (FBD)
I, Q, M, SM, T, C, V, S, L
BOOL
10-4
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
IEC 1131-3 Instructions
Output Examples
LAD
Network 1
%I0.0
%Q0.0
%Q0.1
S
%Q0.2
R
%Q0.3
R
FBD
Network 1
AND
%I0.0
%SM0.0
%Q0.0
=
%Q0.1
S
%Q0.2
R
%Q0.3
R
Timing Diagram
I0.0
Q0.0
Q0.1
Q0.2
Q0.3
Figure 10-2
Examples of Output Instructions for LAD and FBD
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
10-5
IEC 1131-3 Instructions
Set Dominant Bistable
L
A
D
L
A
D
F
B
D
xxx
SR
S1 OUT
The xxx function block parameter specifies the Boolean
parameter that is set or reset. The optional output
reflects the signal state of the xxx parameter.
R
3
221
3
222
The Set Dominant Bistable is a latch where the set
dominates. If the set (S1) and reset (R) signals are both
true, the output (OUT) will be true.
3
224
Inputs/Outputs
Operands
Data Types
S1, R (LAD)
Power Flow
BOOL
S1, R (FBD)
I, Q, M, SM, T, C,V, S, Power Flow
BOOL
OUT (LAD)
Power Flow
BOOL
OUT (FBD)
I, Q, M, SM,T, C, V, S, L, Power Flow
BOOL
xxx
I, Q, M, V, S
BOOL
Reset Dominant Bistable
L
A
D
xxx
RS
S
OUT
F
B
D
R1
3
221
3
222
The Reset Dominant Bistable is a latch where the reset
dominates. If the set (S) and reset (R1) signals are both
true, the output (OUT) will be false.
The xxx function block parameter specifies the Boolean
parameter that is set or reset. The optional output
reflects the signal state of the xxx parameter.
3
224
Inputs/Outputs
Operands
Data Types
S, R1 (LAD)
Power Flow
BOOL
S, R1 (FBD)
I, Q, M, SM, T, C, V, S, L, Power Flow
BOOL
OUT (LAD)
Power Flow
BOOL
OUT (FBD)
I, Q, M, SM, T, C,V, S, L, Power Flow
BOOL
xxx
I, Q, M, V, S
BOOL
10-6
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
IEC 1131-3 Instructions
10.2
IEC Compare Instructions
There are no non-standard IEC Compare instructions.
Compare Equal
L
A
D
EQ
EN OUT
IN1
IN2
F
B
D
The Compare Equal function compares IN1 and IN2
with the Boolean result placed in OUT. The input and
output data types can vary but must be of the same type.
Byte comparisons are unsigned. Integer, double integer,
and real comparisons are signed.
EQ
3
221
3
222
3
224
Inputs/Outputs
Operands
Data Types
Inputs
(LAD & FBD)
IB, QB, MB, SB, SMB, VB, LB, IW, QW, MW, SW, SMW, VW, LW,
T, C, AIW, ID, QD, MD, SD, SMD, VD, LD, HC, AC, Constant,
*VD, *AC, *LD
BYTE, INT, DINT
REAL
OUT (LAD only)
Power Flow
BOOL
OUT (FBD only)
I, Q, M, SM, T, C, V, S, L, Power Flow
BOOL
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
10-7
IEC 1131-3 Instructions
Compare Not Equal
L
A
D
NE
EN OUT
IN1
IN2
F
B
D
The Compare Not Equal function compares IN1 and IN2
with the Boolean result placed in OUT. The input and
output data types can vary, but must be of the same
type.
Byte comparisons are unsigned. Integer, double integer,
and real comparisons are signed.
NE
3
221
3
222
3
224
Inputs/Outputs
Operands
Data Types
Inputs
(LAD & FBD)
IB, QB, MB, SB, SMB, VB, LB, IW, QW, MW, SW, SMW, VW, LW,
T, C, AIW, ID, QD, MD, SD, SMD, VD, LD, HC, AC, Constant,
*VD, *AC, *LD
BYTE, INT, DINT,
REAL
OUT (LAD only)
Power Flow
BOOL
OUT(FBD only)
I, Q, M, SM, T, C, V, S, L, Power Flow
BOOL
Compare Less Than
L
A
D
LT
EN
OUT
IN1
IN2
The Compare Less Than function compares IN1 less
than IN2 with the Boolean result placed in OUT. The
input and output data types can vary, but they must be of
the same type.
Byte comparisons are unsigned. Integer, double integer,
and real comparisons are signed.
F
B
D
LT
3
221
3
222
3
224
Inputs/Outputs
Operands
Data Types
Inputs
(LAD & FBD)
IB, QB, MB, SB, SMB, VB, LB, IW, QW, MW, SW, SMW, VW, LW,
T, C, AIW, ID, QD, MD, SD, SMD, VD, LD, HC, AC, Constant,
*VD, *AC, *LD
BYTE, INT, DINT,
REAL
OUT (LAD only)
Power Flow
BOOL
OUT (FBD only)
I, Q, M, SM, V, S, L, Power Flow
BOOL
10-8
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
IEC 1131-3 Instructions
Compare Less Than or Equal
L
A
D
LE
EN OUT
IN1
IN2
The Compare Less Than or Equal function compares
IN1 less than or equal to IN2 with the Boolean result
placed in OUT. The input and output data types can vary,
but they must be of the same type.
Byte comparisons are unsigned. Integer, double integer,
and real comparisons are signed.
F
B
D
LE
3
221
3
222
3
224
Inputs/Outputs
Operands
Data Types
Inputs
(LAD & FBD)
IB, QB, MB, SB, SMB, VB, LB, IW, QW, MW, SW, SMW, VW, LW,
T, C, AIW, ID, QD, MD, SD, SMD, VD, LD, HC, AC, Constant,
*VD, *AC, *LD
BYTE, INT, DINT,
REAL
OUT (LAD only)
Power Flow
BOOL
OUT (FBD only)
I, Q, M, SM, V, S, L, Power Flow
BOOL
Compare Greater Than
L
A
D
GT
EN
OUT
IN1
IN2
The Compare Greater Than function compares IN1
greater than IN2 with the Boolean result placed in OUT.
The input and output data types can vary, but they must
be of the same type.
Byte comparisons are unsigned. Integer, double integer,
and real comparisons are signed.
F
B
D
GT
3
221
3
222
3
224
Inputs/Outputs
Operands
Data Types
Inputs
(LAD & FBD)
IB, QB, MB, SB, SMB, VB, LB, IW, QW, MW, SW, SMW, VW, LW,
T, C, AIW, ID, QD, MD, SD, SMD, VD, LD, HC, AC, Constant,
*VD, *AC, *LD
BYTE, INT, DINT,
REAL
OUT (LAD only)
Power Flow
BOOL
OUT (FBD only)
I, Q, M, SM, V, S, L, Power Flow
BOOL
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
10-9
IEC 1131-3 Instructions
Compare Greater Than or Equal
L
A
D
GE
EN OUT
IN1
IN2
The Compare Greater Than or Equal function
compares IN1 greater than or equal to IN2 with the
Boolean result placed in OUT. The input and output data
types can vary, but they must be of the same type.
Byte comparisons are unsigned. Integer, double integer,
and real comparisons are signed.
F
B
D
GE
3
221
3
222
3
224
Inputs/Outputs
Operands
Data Types
Inputs
(LAD & FBD)
IB, QB, MB, SB, SMB, VB, LB, IW, QW, MW, SW, SMW, VW, LW,
T, C, AIW, ID, QD, MD, SD, SMD, VD, LD, HC, AC, Constant,
*VD, *AC, *LD
BYTE, INT, DINT,
REAL
OUT (LAD only)
Power Flow
BOOL
OUT (FBD only)
I, Q, M, SM, V, S, L, Power Flow
BOOL
10-10
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
IEC 1131-3 Instructions
10.3
IEC Timer Instructions
Table 10-2 gives page references for the non-standard IEC Timer instructions.
Table 10-2 Non-Standard IEC Timer Instructions
Description
Page
Retentive On-Delay Timer Instruction
9-15
On-Delay Timer
L
A
D
xxx
TON
IN
PT
Q
ET
F
B
D
3
221
3
222
3
224
The On-Delay Timer function block times up to the
preset value when the enabling input (IN) becomes true.
When the elapsed time (ET) is greater than or equal to
the Preset Time (PT), the timer output bit (Q) turns on.
The output bit is reset when the enabling input goes
false. When the preset time (PT) is reached, timing stops
and the timer is disabled.
Inputs/Outputs
Operands
Data Types
IN (LAD)
Power Flow
BOOL
IN (FBD)
I, Q, M, SM, T, C, V, S, L, Power Flow
BOOL
PT (LAD & FBD)
VW, IW, QW, MW, SMW, LW, SW, AIW, AC, Constant, *VD, *AC, *LD
INT
Q (LAD & FBD)
I, Q, M, SM, V, S, L
BOOL
ET (LAD & FBD)
VW, IW, QW, MW, SMW, LW, SW, AQW, AC, *VD, *AC, *LD
INT
xxx
refer to Table 10-3
TON
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
10-11
IEC 1131-3 Instructions
Off-Delay Timer
L
A
D
xxx
IN TOF
Q
PT
F
B
D
ET
3
221
3
222
The Off-Delay Timer function block is used to delay the
setting of an output false for a fixed period of time after
the input goes false. It times up to the preset value when
the enabling input (IN) goes false. When the elapsed
time (ET) is greater than or equal to the preset time (PT),
the timer output bit (Q) turns on.
3
224
Once the preset is reached, the timer output bit turns false and the elapsed time is
maintained until the enabling input (IN) makes the transition to true. If the enabling
input (IN) makes the transition to false for a period of time shorter than the preset
time (PT), the output bit remains true.
For information about timer numbers and resolutions, refer to Table 10-3.
Inputs/Outputs
Operands
Data Types
IN (LAD)
Power Flow
BOOL
IN (FBD)
I, Q, M, SM,T, C, V, S, L, Power Flow
BOOL
PT (LAD & FBD)
VW, IW, QW, MW, SMW, LW, SW, AIW, AC, Constant, *VD, *AC, *LD
INT
Q (LAD & FBD)
I, Q, M, SM, V, S, L
BOOL
ET (LAD & FBD)
VW, IW, QW, MW, SMW, LW, SW, AQW, AC,*VD, *AC, *LD
INT
xxx
refer to Table 10-3
TOF
Pulse Timer
L
A
D
xxx
TP
Q
IN
PT
F
B
D
ET
3
221
3
222
The Pulse Timer function block is used to generate
pulses for a specific duration. As the enabling input (IN)
becomes true, the output bit (Q) turns on. The output bit
remains true for the pulse specified within the preset time
(PT). Once the elapsed time (ET) reaches preset (PT),
the output bit (Q) becomes false.
3
224
For information about timer numbers and resolutions, refer to Table 10-3.
Inputs/Outputs
Operands
Data Types
IN LAD)
Power Flow
BOOL
IN (FBD)
I, Q, M, SM, T, C, V, S, L, Power Flow
BOOL
PT (LAD & FBD)
VW, IW, QW, MW, SMW, LW, SW, AIW, AC, Constant, *VD, *AC, *LD
INT
Q (LAD & FBD)
I, Q, M, SM, S, V, L
BOOL
ET (LAD & FBD)
VW, IW, QW, MW, SW, LW, AQW, AC, *VD, *AC, *LD
INT
xxx
refer to Table 10-3
TP
10-12
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
IEC 1131-3 Instructions
Understanding the IEC 1131-3 Timer Instructions
TON, TOF and TP timers are available in three resolutions. The resolution is
determined by the timer number and is shown in Table 10-3. Each count of the
current value is a multiple of the time base. For example, a count of 50 on a 10-ms
timer represents 500 ms.
Table 10-3 Timer Numbers and Resolutions
Resolution in
milliseconds (ms)
Timer Type
TON, TOF,
TP
Maximum Value
in seconds (s)
Timer Number
1 ms
32.767 s
T32, T96
10 ms
327.67 s
T33 to T36, T97 to T100
100 ms
3276.7 s
T37 to T63, T101 to T255
Note
You cannot share the same timer numbers for TOF, TP, and TON. For example,
you cannot have both a TON T32 and a TOF T32.
On-Delay Timer Example
LAD
FBD
T33
TON
IN
Input
3
PT
Q
ET
Input
3
IN
PT
T33
TON
Q
Output
ET
%VW100
Output
%VW100
Timing Diagram
Input
VW100 (current)
PT = 3
PT = 3
Output (Q)
Figure 10-3
Example of On-Delay Timer for LAD and FBD
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
10-13
IEC 1131-3 Instructions
Off-Delay Timer Example
LAD
FBD
T33
Input
Input IN
3 PT
TOF
3
IN
PT
Q Output
ET %VW100
T33
TOF
Q
Output
ET
%VW100
Timing Diagram
Input
VW100 (current)
PT = 3
PT = 3
Output (Q)
Figure 10-4
Example of Off-Delay Timer for LAD and FBD
Pulse Timer Example
LAD
FBD
T33
Input
3
IN
PT
TP
Q
ET
Output
%VW100
Input
IN
3
PT
T33
TON
Q
ET
Output
%VW100
Timing Diagram
Input
VW100 (current)
PT = 3
Output
Figure 10-5
10-14
Example of Pulse Timer Instruction for LAD and FBD
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
IEC 1131-3 Instructions
10.4
IEC Counter Instructions
Table 10-4 gives page references for the non-standard IEC Counter instructions.
Table 10-4 Non-Standard IEC Counter Instructions
Description
Page
High-Speed Counter Instruction
9-27
High-Speed Counter Definition Instruction
9-27
Pulse Output Instruction
9-49
Up Counter
L
A
D
CU
F
B
D
R
PV
xxx
CTU
3
221
3
222
Q
CV
The Up Counter function block counts up from the
current value to the preset value on the rising edges of
the Count Up (CU) input. When the current value (CV) is
greater than or equal to the preset value (PV), the
counter output bit (Q) turns on. The counter is reset
when the reset input (R) is enabled. The Up Counter
stops counting when it reaches the preset value (PV).
3
224
Note
Since there is one current value for each counter, do not assign the same number
to more than one counter. (Up Counters, Down Counters, and Up/Down Counters
access the same current value.)
Inputs/Outputs
Operands
Data Types
CU (FBD only)
I, Q, M, SM, V, S, L, T, C, Power Flow
BOOL
R (FBD only)
I, Q, M, SM, V, S, L, T, C, Power Flow
BOOL
PV (LAD & FBD)
VW, IW, QW, MW, SMW, LW, SW, AIW, AC, Constant, *VD, *AC, *LD
INT
Q (LAD & FBD)
I, Q, M, SM, V, S, L
BOOL
CV (LAD & FBD)
VW, IW, QW, MW, SW, SMW, LW, AC, *VD, *AC, *LD
INT
xxx
C0 through C255
CTU
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
10-15
IEC 1131-3 Instructions
Down Counter
L
A
D
CD
LD
F
B
D
xxx
CTD
Q
CV
PV
3
221
3
222
The Down Counter function block counts down from the
preset value on the rising edges of the Count Down (CD)
input. When the current value (CV) is equal to zero, the
counter output bit (Q) turns on. The counter resets and
loads the current value (CV) with the preset value (PV)
when the load input (LD) is enabled. The Down Counter
stops counting when it reaches zero.
3
224
Note
Since there is one current value for each counter, do not assign the same number
to more than one counter. (Up Counters, Down Counters, and Up/Down Counters
access the same current value.)
Table 10-5 Count Down Counter Operands and Data Types
Operands
Inputs/Outputs
Data Types
CD (FBD)
I, Q, M, SM, V, S, L, T, C, Power Flow
BOOL
LD (FBD)
I, Q, M, SM, V, S, L, T, C, Power Flow
BOOL
PV (LAD, FBD)
VW, IW, QW, MW, SMW, LW, SW, AIW, AC, Constant, *VD, *AC,
*LD
INT
Q (LAD & FBD)
I, Q, M, SM, V, S, L
BOOL
CV (LAD & FBD)
VW, IW, QW, MW, SW, LW, AC, *VD, *AC, *LD
INT
xxx
C0 through C255
CTD
10-16
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
IEC 1131-3 Instructions
Up/Down Counter
xxx
L
A
D
CTUD
CD
CU
R
LD
QU
PV
QD
F
B
D
CV
3
221
3
222
3
The Up/Down Counter function block counts up or down
from the preset value on the rising edges of the Count Up
(CU) or Count Down (CD) input. When the current value
(CV) is equal to preset, the output (QU) turns on. When
the current value (CV) is equal to zero, the output (QD)
turns on. The counter loads the current value (CV) with
the preset value (PV) when the load (LD) input is
enabled. Similarly, the counter resets and loads the
current value (CV) with zero when the reset (R) is
enabled. The counter stops counting when it reaches
preset or zero.
224
Note
Since there is one current value for each counter, do not assign the same number
to more than one counter. (Up Counters, Down Counters, and Up/Down Counters
access the same current value.)
Inputs/Outputs
Operands
Data Types
CD (FBD only)
I, Q, M, SM, V ,S ,L, T, C, Power Flow
BOOL
CU (FBD only)
I, Q, M, SM, V, S, L, T, C, Power Flow
BOOL
R (FBD only)
I, Q, M, SM, V, S, L,T, C, Power Flow
BOOL
LD (FBD only)
I, Q, M, SM, V, S, L, T, C, Power Flow
BOOL
PV (LAD & FBD)
VW, IW, QW, MW, SMW, LW, SW, AIW, AC, Constant, *VD,
*AC, *LD
INT
QU (LAD & FBD)
I, Q, M, SM, V, S, L
BOOL
QD (LAD & FBD)
I, Q, M, SM, V, S, L
BOOL
CV (LAD & FBD)
VW, T, C, IW, QW, MW, SW, LW, AC, *VD, *AC, *LD
INT
xxx
C0 through C255
CTUD
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
10-17
IEC 1131-3 Instructions
Counter Example
LAD
FBD
C48
CTUD
CU
%I4.0
I4.0
C48
CTUD
CU
I3.0
CD
I2.0
R
%I3.0
CD
%I2.0
R
%I1.0
4
LD
PV
QU
QD
CV
%I1.0
LD
4
PV
%Q0.0
%Q0.1
%VW0
QU
QD
CV
%Q0.0
%Q0.1
%VW0
Timing Diagram
I4.0
CU-Up
I3.0
CD-Down
I2.0
R-Reset
I1.0
LD-Load
4
3
2
VW0
CV-current 0
4
4
4
3
3
2
1
0
Q0.0
QU-Up
QD.1
QD-Down
Figure 10-6
10-18
Example of Counter Instruction for LAD and FBD
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
IEC 1131-3 Instructions
10.5
IEC Math Instructions
Table 10-6 gives page references for the non-standard IEC Math instructions.
Table 10-6 Non-Standard IEC Math Instructions
Description
PID Instruction
Page
9-84
Add, Subtract
L
A
D
ADD
ENO
EN
F
B
D
IN1 OUT
OUT
IN2
EN
SUB
ENO
The Add and Subtract functions add or subtract IN1 and
IN2 and place the result in OUT. The input and output
data types can vary, but must be of the same type. For
example, two 16-bit variables can be added or
subtracted, but the result must be placed in a 16-bit
variable; the result of adding or subtracting two 32-bit
variables must be placed in a 32-bit variable.
In LAD:
IN1 OUT
OUT
Error conditions that set ENO = 0: SM1.1 (overflow),
SM4.3 (run-time), 0006 (indirect address)
IN2
3
221
3
222
IN1 + IN2 = OUT
IN1 - IN2 = OUT
3
These functions affect the following Special Memory bits:
SM1.0 (zero); SM1.1 (overflow); SM1.2 (negative)
224
Operands
Inputs/Outputs
Data Types
IN1, IN2
VW, IW, QW, MW, SW, SMW, LW, AIW, T, C, VD, ID, QD, MD,
SMD, SD, LD, HC, AC, Constant, *VD, *AC, *LD
INT, DINT, REAL
OUT
VW, IW, QW, MW, SW, SMW, LW, T, C, VD, ID, QD, MD, SMD,
SD, LD, AC, *VD, *AC, *LD
INT, DINT, REAL
Note
Real or floating-point numbers are represented in the format described in the
ANSI/IEEE 754-1985 standard (single-precision). Refer to the standard for more
information.
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
10-19
IEC 1131-3 Instructions
Multiply, Divide
L
A
D
EN
F
B
D
MUL
ENO
IN1 OUT
OUT
IN1 OUT
OUT
IN2
In LAD:
EN
221
The Divide function divides IN1 by IN2 and places the
result in the variable specified by OUT.
The input and output data types can vary, but must be of
the same type. For example, the product of multiplying
two 16-bit variables must be placed in a 16-bit variable,
the product of multiplying two 32-bit variables must be
placed in a 32-bit variable.
IN2
3
The Multiply function multiplies IN1 and IN2 and places
the result in the variable specified by OUT.
3
222
DIV
ENO
3
224
IN1<IN2 = OUT
IN1 / IN2 = OUT
Error conditions that set ENO = 0: SM1.1 (overflow),
SM1.3 (divide-by-zero), SM4.3 (run-time), 0006 (indirect
address)
These functions affect the following Special Memory bits: SM1.0 (zero); SM1.1
(overflow); SM1.2 (negative); SM1.3 (divide-by-zero)
If SM1.1 (overflow bit) is set, then the other math status bits are cleared and the
output operand is not altered. For integer operations, if SM1.3 is set during a divide
operation, the other math status bits are left unchanged and the original input
operands are not altered. Otherwise, all supported math status bits contain valid
status upon completion of the math operation.
Inputs/Outputs
Operands
Data Types
IN1, IN2
VW, IW, QW, MW, SW, SMW, LW, AIW, T, C, VD, ID, QD, MD,
SMD, SD, LD, HC, AC, Constant, *VD, *AC, *LD
INT, DINT, REAL
OUT
VW, IW, QW, MW, SW, SMW, T, C, LW, VD, ID, QD, MD, SMD,
SD, LD, AC, *VD, *AC, *LD
INT, DINT, REAL
Note
Real or floating-point numbers are represented in the format described in the
ANSI/IEEE 754-1985 standard (single-precision). Refer to the standard for more
information.
10-20
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
IEC 1131-3 Instructions
Math Examples
LAD
Network 1
%I0.0
EN
ADD
ENO
%AC1 IN1 OUT
OUT
MUL
EN
%AC0 %AC1 IN1 OUT
OUT
%AC0 IN2
DIV
ENO
EN
ENO
%VD100
%VW102 IN2
%VW202
IN1 OUT
OUT
%VW10
%VD200
IN2
FBD
Network 1
%I0.0
EN
ADD
ENO
%AC1
IN1 OUT
OUT
%AC0
IN2
MUL
EN
%AC0
%AC1
ENO
IN1 OUT
OUT
DIV
ENO
EN
%VD100 %VD200 IN1 OUT
OUT
%VW102 IN2
%VD200
%VD10 IN2
Application
Add
AC1
4000
VW90
6000
Multiply
AC1
plus
Figure 10-7
10000
4000
4000
VD200
multiplied by
VD100
200
VD100
800000
equals
VW90
Divide
divided by
VD10
equals
41.0
equals
VD200
97.56098
Examples of Math Functions for LAD and FBD
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
10-21
IEC 1131-3 Instructions
Square Root
L
A
D
SQRT
EN ENO
F
B
D
IN
3
221
3
222
OUT
3
The Square Root function takes the square root of a
value provided by IN and places the result in OUT.
Error conditions that set ENO = 0: SM1.1 (overflow),
SM4.3 (run-time), 0006 (indirect address)
This function affects the following Special Memory bits:
SM1.0 (zero); SM1.1 (overflow); SM1.2 (negative)
224
If SM1.1 (overflow bit) is set, then the other math status
bits are cleared and the output operand is not altered.
Inputs/Outputs
Operands
Data Types
IN
VD, ID, QD, MD, SMD, SD, LD, AC, Constant, *VD, *AC, *LD
REAL
OUT
VD, ID, QD, MD, SMD, SD, LD, AC, *VD, *AC, *LD
REAL
Increment, Decrement
L
A
D
F
B
D
Inputs/Outputs
EN
INC
ENO
IN
OUT
EN
DEC
ENO
IN
OUT
3
3
3
221
222
224
The Increment and Decrement functions add or subtract
1 to or from IN and place the result into OUT.
Increment and decrement byte operations are unsigned.
Error conditions that set ENO = 0: SM1.1 (overflow),
SM4.3 (run-time), 0006 (indirect address)
These functions affect the following Special Memory bits:
SM1.0 (zero); SM1.1 (overflow), SM1.2 (negative)
Operands
Data Types
IN
VB, IB, QB, MB, SB, SMB, LB, VW, IW, QW, MW, SW, SMW, LW, T,
C, AIW, VD, ID, QD, MD, SD, SMD, LD, HC, AC, Constant, *VD,
*AC, *LD
BYTE, INT,
DINT
OUT
VB, IB, QB, MB, SB, SMB, LB, VW, IW, QW, MW, SW, SMW, T, C,
LW, VD, ID, QD, MD, SMD, SD, LD, AC,*VD, *AC, *LD
BYTE, INT,
DINT
10-22
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
IEC 1131-3 Instructions
Increment, Decrement Example
LAD
I4.0
AC0
EN
INC
ENO
IN
OUT
AC0
VD100
EN
DEC
ENO
IN
OUT
VD100
FBD
I4.0
AC0
INC
EN ENO
IN
OUT
DEC
EN ENO
AC0
VD100
IN
OUT
VD100
Application
Increment Word
AC0
125
Decrement Double Word
VD100
decrement
increment
AC0
Figure 10-8
126
128000
VD100
127999
Example of Increment/Decrement Functions for LAD and FBD
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
10-23
IEC 1131-3 Instructions
10.6
IEC Move Instructions
Table 10-7 gives page references for the non-standard IEC Move instructions.
Table 10-7 Non-Standard IEC Move Instructions
Description
Page
Swap Instructions
9-102
Move
L
A
D
MOVE
EN ENO
F
B
D
IN
3
221
3
222
OUT
3
The Move and Assign Values function moves the value
IN to the address OUT. This instruction performs an
assignment operation. The input parameter is not
modified during execution.
The input and output data types can vary, but must be of
the same type.
224
Error conditions that set ENO = 0: SM4.3 (run-time),
0006 (indirect address)
Inputs/Outputs
Operands
Data Types
IN
VB, IB, QB, MB, SB, SMB, LB, VW, IW, QW, MW, SM, SMW, LW, T,
C, AIW, VD, ID, QD, MD, SMD, SD, LD, HC, &VB, &IB, &QB, &MB,
&SB, AC, Constant, *VD, *AC, *LD
BYTE, WORD,
INT, DWORD,
DINT, REAL
OUT
VB, IB, QB, MB, SB, SMB, LB, VW, IW, QW, MW, SW, SMW, LW, T,
C, AQW, VD, ID, QD, MD, SMD, SD, LD, AC, *VD, *AC, *LD
BYTE, WORD,
INT, DWORD,
DINT, REAL
10-24
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
IEC 1131-3 Instructions
Block Move
L
A
D
BLKMOVE
EN
ENO
F
B
D
IN
The Block Move function moves the N number of words
specified by the address IN to the address OUT. N has a
range of 1 to 255.
The input and output data types can vary, but must be of
the same type.
OUT
N
Block Move is a non-standard IEC-only function.
3
3
3
221
222
224
Error conditions that set ENO = 0: SM4.3 (run-time),
0006 (indirect address), 0091 (operand out of range)
Inputs/Outputs
Operands
Data Types
IN
VB, IB, QB, MB, SB, SMB, LB, VW, IW, QW, MW, SM, SMW, LW, T,
C, AIW, VD, ID, QD, MD, SMD, SD, LD, HC, &VB, &IB, &QB, &MB,
&SB, AC, Constant, *VD, *AC, *LD
BYTE, WORD,
DWORD
OUT
VB, IB, QB, MB, SB, SMB, LB, VW, IW, QW, MW, SW, SMW, LW, T,
C, AQW, VD, ID, QD, MD, SMD, SD, LD, AC, *VD, *AC, *LD
BYTE, WORD,
DWORD
N
VB, IB, QB, MB, SB, SMB, LB, AC, Constant, *VD, *AC, *LD
BYTE
Move Examples
LAD
%I2.1
FBD
MOVE
EN ENO
%VB50
%VD100
IN
OUT
EN
SQRT
ENO
IN
OUT
%AC0
%VB50
%I2.1
SQRT
EN ENO
MOVE
EN ENO
IN
OUT
%AC0 %VD100 IN
OUT
%AC1
%AC1
Application
Move
VB50
C3
Square Root
VD100 150.00
move
AC0
Figure 10-9
C3
square root
AC1 12.247
Example of Move Function for LAD and FBD
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
10-25
IEC 1131-3 Instructions
10.7
IEC Logic Instructions
There are no non-standard IEC Logic instructions.
And, Or, Exclusive Or
L
A
D
AND
ENO
EN
F
B
D
IN1 OUT
IN2
OR
ENO
EN
IN1 OUT
IN2
EN
The And function ANDs the corresponding bits of IN1
and IN2 and loads the result into OUT.
The Or function ORs the corresponding bits of IN1 with
IN2 and loads the result into OUT.
The Exclusive Or (XOR) function XORs the
corresponding bits of IN1 with IN2 and loads the result
into OUT.
The input and output data types can vary, but must be of
the same type.
Error conditions that set ENO = 0: SM4.3 (run-time),
0006 (indirect address)
XOR
ENO
IN1 OUT
These instructions affect the following Special Memory
bits: SM1.0 (zero)
IN2
3
221
Inputs/Outputs
3
222
3
224
Operands
Data Types
IN1, IN2
VB, IB, QB, MB, SB, SMB, LB, VW, IW, QW, MW, SW, SMW,
AIW, T, C, LW, VD, ID, QD, MD, SD, SMD, LD, HC, AC,
Constant, *VD, *AC, *LD
BYTE, WORD
DWORD
OUT
VB, IB, QB, MB, SB, SMB, LB, VW, IW, QW, MW, SW, SMW,
T, C, LW, VD, ID, QD, MD, SD, SMD, LD, AC, *VD, *AC, *LD
BYTE, WORD
DWORD
10-26
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
IEC 1131-3 Instructions
And, Or, and Exclusive Or Example
LAD
%I4.0
%AC1
%VW90
AND
ENO
EN
IN1 OUT
%VW90
IN2
EN
OR
ENO
%AC1
IN1
%VW100
IN2
EN
OUT
%VW100
XOR
ENO
%AC1
IN1
%VW200
IN2
OUT
%VW200
FBD
%I4.0
EN
AND
ENO
%AC1
IN1
%VW90
IN2
OUT
OR
ENO
EN
%VW90
%AC1
IN1
%VW100
IN2
OUT
EN
%VW100
%AC1
%VW200
XOR
ENO
IN1 OUT
%VW200
IN2
Application
And Word
Or Word
AC1 0001 1111 0110 1101
AC1 0001 1111 0110 1101
AND
AC0 1101 0011 1110 0110
equals
AC0 0001 0011 0110 0100
OR
VW100 1101 0011 1010 0000
equals
VW100 1101 1111 1110 1101
Exclusive Or Word
AC1
0001 1111 0110 1101
XOR
AC0 0001 0011 0110 0100
equals
AC0 0000 1100 0000 1001
Figure 10-10 Example of And, Or, Exclusive Or Functions
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
10-27
IEC 1131-3 Instructions
Not
L
A
D
F
B
D
3
221
Inputs/Outputs
EN
NOT
NOT
ENO
IN
OUT
3
222
3
224
The Not function inverts the corresponding bits of IN and
loads the result into OUT.
The input and output data types can vary, but must be of
the same type.
Error conditions that set ENO = 0: SM4.3 (run-time),
0006 (indirect address)
This instruction affects the following Special Memory bits:
SM1.0 (zero)
Operands
Data Types
IN
VB, IB, QB, MB, SB, SMB, LB, VW, IW, QW, MW, SW, SMW,
AIW, T, C, LW, VD, ID, QD, MD, SD, SMD, LD, HC, AC,
Constant, *VD, *AC, *LD
BYTE, WORD
DWORD
OUT
VB, IB, QB, MB, SB, SMB, LB, VW, IW, QW, MW, SW, SMW,
T, C, LW, VD, ID, QD, MD, SD, SMD, LD, AC,*VD, *AC, *LD
BYTE, WORD
DWORD
10-28
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
IEC 1131-3 Instructions
10.8
IEC Shift and Rotate Instructions
Table 10-8 gives page references for the non-standard IEC Shift instructions.
Table 10-8 Non-Standard IEC Instructions
Description
Page
Shift Register Bit Instruction
9-123
Logical Shift Right, Logical Shift Left
L
A
D
F
B
D
EN
SHR
ENO
IN
OUT
N
EN
SHL
ENO
IN
OUT
3
3
222
The Shift Left function shifts the value specified by the
variable IN to the left for the number of locations
specified by N. The result is placed into the variable
specified by OUT. Each bit is filled with a zero when it is
shifted left.
Error conditions that set ENO = 0: SM4.3 (run-time),
0006 (indirect address)
N
221
The Shift Right function shifts the value specified by the
variable IN to the right for the number of locations
specified by N. The result is placed into the variable
specified by OUT. Each bit is filled with a zero when it is
shifted right.
3
224
Inputs/Outputs
Operands
Data Types
IN
VB, IB, QB, MB, SB, SMB, LB, VW, IW, QW, MW, SW, SMW,
LW, T, C, AIW, VD, ID, QD, MD, SD, SMD, LD, HC, AC,
Constant, *VD, *LD, *AC
BYTE, WORD
DWORD
N
VB, IB, QB, MB, SB, SMB, LB, AC, Constant, *VD, *LD, *AC
BYTE
OUT
VB, IB, QB, MB, SB, SMB, LB, VW, IW, QW, MW, SW, SMW,
LW,T, C, VD, ID, QD, MD, SD, SMD, LD, AC *VD, *LD, *AC
BYTE, WORD
DWORD
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
10-29
IEC 1131-3 Instructions
Logical Rotate Right, Logical Rotate Left
L
A
D
ROR
EN
ENO
F
B
D
IN
OUT
OUT
N
EN
ROL
ENO
IN
OUT
OUT
The Rotate Right and Rotate Left functions rotate the
input value (IN) right or left by the shift count (N), and
load the result in the output (OUT).
The rotate is circular. In ROR, bit zero is rotated to the
most significant bit. In ROL, the most significant bit is
rotated to bit zero.
Error conditions that set ENO = 0: SM4.3 (run-time),
0006 (indirect address)
N
3
221
Inputs/Outputs
3
222
3
224
Operands
Data Types
IN
VB, IB, QB, MB, SB, SMB, LB, VW, IW, QW, MW, SW, SMW,
LW, T, C, AIW, VD, ID, QD, MD, SD, SMD, LD, HC, AC,
Constant, *VD, *LD, *AC
BYTE, WORD
DWORD
N
VB, IB, QB, MB, SB, SMB, LB, AC, Constant, *VD, *LD, *AC
BYTE
OUT
VB, IB, QB, MB, SB, SMB, LB, VW, IW, QW, MW, SW, SMW,
LW, T, C, VD, ID, QD, MD, SD, SMD, LD, AC, *VD, *LD, *AC
BYTE, WORD
DWORD
10-30
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
IEC 1131-3 Instructions
Shift and Rotate Examples
LAD
%I4.0
FBD
ROR
EN
ENO
%VW100
2
IN
OUT
%I4.0
EN
ROR
ENO
%VW100
IN
OUT
%VW100
N
SHL
EN
ENO
%VW200
3
IN
%VW100
%VW200
3
2 N
OUT
EN
SHL
ENO
IN
OUT
%VW200
N
%VW200
N
Application
Rotate
Before rotate
VW100
0100 0000 0000 0001
After first rotate
VW100
1010 0000 0000 0000
After second rotate
VW100
0101 0000 0000 0000
Zero Memory Bit (SM1.0)
Overflow Memory Bit (SM1.1)
Shift
Overflow
x
Before shift
VW200
Overflow
1
After first shift
VW200
1100 0101 0101 1010
VW200
1000 1010 1011 0100
Overflow
0
Overflow
1110 0010 1010 1101
After second shift
x
Overflow
1
Overflow
1
= 0
= 0
After third shift
VW200
Overflow
0001 0101 0110 1000
Zero Memory Bit (SM1.0)
=
Overflow Memory Bit (SM1.1) =
1
0
1
Figure 10-11 Example of Shift and Rotate Functions for LAD and FBD
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
10-31
IEC 1131-3 Instructions
10.9
IEC Conversion Instructions
Table 10-9 gives page references for the non-standard IEC Conversion
instructions.
Table 10-9 Non-Standard IEC Conversion Instructions
Page
Description
Decode Instruction
9-131
Encode Instruction
9-131
Segment Instruction
9-133
ASCII to Hex, Hex to ASCII Instruction
9-135
Integer to ASCII Instruction
9-136
Double Integer to ASCII Instruction
9-138
Real to ASCII Instruction
9-139
Truncate
L
A
D
TRUNC
EN
ENO
F
B
D
IN
3
221
Inputs/Outputs
3
222
OUT
3
224
The Truncate function converts a real number (IN) into a
double integer value and places the result in OUT. No
rounding is performed.
Error conditions that set ENO = 0: SM1.1 (overflow),
SM4.3 (run-time), 0006 (indirect address)
This function affects the following Special Memory bits:
SM1.1 (overflow)
Operands
Data Types
IN
VD, ID, QD, MD, SD, SMD, LD, AC, Constant, *VD, *AC,* LD
REAL
OUT
VD, ID, QD, MD, SD, SMD, LD, AC, *VD, *AC, *LD
DINT
10-32
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
IEC 1131-3 Instructions
Binary Coded Decimal to Integer, Integer to BCD
L
A
D
F
B
D
BCD_TO_I
EN ENO
IN
OUT
I_TO_BCD
EN ENO
IN
3
221
3
222
The BCD to Integer function converts the input
Binary-Coded Decimal value (IN) to an integer value and
loads the result into the variable specified by OUT.
OUT
3
The Integer to BCD function converts the input integer
value to a Binary-Coded Decimal value and loads the
result in OUT.
Error conditions that set ENO = 0: SM1.6 (BCD),
SM4.3 (run-time), 0006 (indirect address)
These functions affect the following Special Memory bits:
SM1.6 (invalid BCD)
224
Inputs/Outputs
Operands
Data Types
IN
VW, IW, QW, MW, SW, SMW, LW, T, C, AIW, AC, Constant,
*VD, *LD, *AC
WORD
OUT
VW, IW, QW, MW, SW, SMW, LW, T, C, AC, *VD, *AC, *LD
WORD
Double Integer to Real
L
A
D
DI_TO_R
EN ENO
F
B
D
IN
3
221
3
222
OUT
The Double Integer to Real function converts a 32-bit,
signed integer (IN) into a 32-bit real number loads the
result into the variable specified by OUT.
Error conditions that set ENO = 0: SM4.3 (run-time),
0006 (indirect address)
3
224
Inputs/Outputs
Operands
Data Types
IN
VD, ID, QD, MD,SD, SMD, LD, HC, AC, Constant,*VD,*LD,
*AC
DINT
OUT
VD, ID, QD, MD, SD, SMD, LD, AC, *VD, *LD, *AC
REAL
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
10-33
IEC 1131-3 Instructions
Real To Double Integer
L
A
D
R_TO_DI
EN
ENO
F
B
D
IN
3
221
3
222
OUT
The Real To Double Integer function converts a real
value (N) to a double Integer value and loads the result
into the variable specified by OUT.
Error conditions that set ENO = 0: SM1.1 (overflow),
SM4.3 (run-time), 0006 (indirect address)
3
224
Inputs/Outputs
Operands
Data Types
IN
VD, ID, QD, MD, SD, SMD, LD, AC, Constant,*VD,*LD, *AC
REAL
OUT
VD, ID, QD, MD, SD, SMD, LD, AC, *VD, *LD, *AC
DINT
Double Integer To Integer
L
A
D
DI_TO_I
EN ENO
F
B
D
IN
3
221
Inputs/Outputs
3
222
OUT
3
224
The Double Integer to Integer function converts the
double integer (IN) to an integer value and loads the
result into the variable specified by OUT.
Error conditions that set ENO = 0: SM1.1 (overflow),
SM4.3 (run-time), 0006 (indirect address)
This function affects the following Special Memory bits:
SM1.1 (overflow)
Operands
Data Types
IN
VD, ID, QD, MD, SD, SMD, LD, HC, AC, Constant,*VD,*LD,
*AC
DINT
OUT
VW, IW, QW, MW, SW, SMW, LW, T, C, AC, *VD, *LD, *AC
INT
10-34
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
IEC 1131-3 Instructions
Integer to Double Integer
L
A
D
I_TO_DI
EN ENO
F
B
D
IN
3
221
3
222
The Integer to Double Integer function converts the
integer value specified by IN to a double integer value
and loads the result into the variable specified by OUT.
OUT
3
Error conditions that set ENO = 0: SM4.3 (run-time),
0006 (indirect address)
224
Inputs/Outputs
Operands
Data Types
IN
VW, IW, QW, MW, SW, SMW, LW, T, C, AIW, Constant, AC,
*VD,*LD, *AC
INT
OUT
VD, ID, QD, MD, SD, SMD, LD, AC, *VD, *LD, *AC
DINT
Byte To Integer
L
A
D
B_TO_I
EN ENO
F
B
D
IN
3
221
3
222
OUT
The Byte to Integer function converts the byte value (IN)
to an integer value and loads the result into the variable
specified by OUT.
Error conditions that set ENO = 0: SM4.3 (run-time),
0006 (indirect address)
3
224
Inputs/Outputs
Operands
Data Types
IN
VB, IB, QB, MB, SB, SMB, LB, AC, Constant, *VD, *LD, *AC
BYTE
OUT
VW, IW, QW, MW, SW, SMW, LW, T, C, AC, *VD, *LD, *AC
INT
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
10-35
IEC 1131-3 Instructions
Integer to Byte
L
A
D
The Integer to Byte function converts the integer value
(IN) to a byte value and loads the result into the variable
specified by OUT.
I_TO_B
EN ENO
F
B
D
IN
3
3
221
222
OUT
Error conditions that set ENO = 0: SM1.1 (overflow),
SM4.3 (run-time), 0006 (indirect address)
3
This function affects the following Special Memory bits:
SM1.1 (overflow).
224
Inputs/Outputs
Operands
Data Types
IN
VW, IW, QW, MW, SW, SMW, LW, T ,C, AIW, AC, Constant,
*VD, *LD, *AC
INT
OUT
VB, IB, QB, MB, SB, SMB, LB, AC, *VD, *LD, *AC
BYTE
Conversion Example
LAD
Network 1
%I0.0
I_TO_DI
EN ENO
%VW20 IN
OUT
%AC1
DI_TO_R
EN ENO
%AC1 IN
OUT
EN
MUL
MUL
ENO
%VD0 IN1 OUT
Clear accumulator 1.
Load counter value
(number of inches)
into AC1.
Convert to a real number.
%VD0
%VD8
Multiply by 2.54 to change
to centimeters.
%VD4 IN2
ROUND
EN ENO
%VD8
Network 2
IN
%I3.0
BCD_TO_I
EN ENO
%VW100
IN
OUT
OUT
Convert back to an integer.
%VD12
%VW100
Figure 10-12 Example of Real Number Conversion Instruction for LAD
10-36
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
IEC 1131-3 Instructions
FBD
Network 1
%I0.0
I_TO_DI
EN ENO
%VW20 IN
DI_TO_R
EN ENO
OUT %AC1 %AC1 IN
OUT
EN
MUL
ENO
%VD0 %VD0 IN1 OUT
%VD4 IN2
ROUND
EN ENO
%VD8 %VD8 IN
OUT %VD12
Network 2
%I3.0
%VW100
BCD_TO-I
ENO
EN
IN
OUT %VW100
Application
Double Integer Integer to Real and Truncate
VW20
101
BCD to Integer
Count = 101 inches
VD0
101.0
VD4
2.54
VD8
256.54
V12
257
VW100 1234
2.54 constant (inches to centimeters)
256.54 centimeters as real number
BCDI
VW100 04D2
256 centimeters as integer
Figure 10-13 Example of Real Number Conversion Instruction for FBD
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
10-37
IEC 1131-3 Instructions
10-38
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
A
S7-200 Specifications
Chapter Overview
Section
Description
Page
A.1
General Technical Specifications
A-2
A.2
Specifications for the CPU 221
A-6
A.3
Specifications for the CPU 222
A-11
A.4
Specifications for the CPU 224
A-16
A.5
Specifications for the EM221 Digital Input Module
A-21
A.6
Specifications for the EM222 Digital Output Modules
A-23
A.7
Specifications for the EM223 Digital Combination Modules,
8 Inputs/8 Outputs
A-25
A.8
Optional Cartridges
A-28
A.9
I/O Expansion Cable
A-29
A.10
PC/PPI Cable
A-30
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
A-1
S7-200 Specifications
A.1
General Technical Specifications
National and International Standards
The national and international standards listed below were used to determine
appropriate performance specifications and testing for the S7-200 family of
products. Table A-1 defines the specific adherence to these standards.
Underwriters Laboratories, Inc.: UL 508 Listed (Industrial Control Equipment)
Canadian Standards Association: CSA C22.2 Number 142 Certified (Process
Control Equipment)
Factory Mutual Research: FM Class I, Division 2, Groups A, B, C, & D
Hazardous Locations, T4A
VDE 0160: Electronic equipment for use in electrical power installations
European Community (CE) Low Voltage Directive 73/23/EEC
EN 61131-2: Programmable controllers - Equipment requirements
European Community (CE) EMC Directive 89/336/EEC
Electromagnetic emission standards:
EN 50081-1: residential, commercial, and light industry
EN 50081-2: industrial environment
Electromagnetic immunity standards:
EN 50082-2: industrial environment
A-2
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
S7-200 Specifications
Technical Specifications
The S7-200 CPUs and all S7-200 expansion modules conform to the technical
specifications listed in Table A-1.
Table A-1
Technical Specifications for the S7-200 Family
Environmental Conditions — Transport and Storage
IEC 68-2-2, Test Bb, Dry heat and
IEC 68-2-1, Test Ab, Cold
-40° C to +70° C
IEC 68-2-30, Test Db, Damp heat
25° C to 55° C, 95% humidity
IEC 68-2-31, Toppling
100 mm, 4 drops, unpacked
IEC 68-2-32, Free fall
1 m, 5 times, packed for shipment
Environmental Conditions — Operating
Ambient Temperature Range
(Inlet Air 25 mm below unit)
0° C to 55° C horizontal mounting
0° C to 45° C vertical mounting
95% non-condensing humidity
IEC 68-2-14, Test Nb
5° C to 55° C, 3° C/minute
IEC 68-2-27 Mechanical shock
15 G, 11 ms pulse, 6 shocks in each of 3 axis
IEC 68-2-6 Sinusoidal vibration
0.30 mm peak-to-peak 10 to 57 Hz; 2 G panel mount, 1 G DIN rail mount,
57 Hz to 150 Hz; 10 sweeps each axis, 1 octave/minute
EN 60529, IP20 Mechanical protection
Protects against finger contact with high voltage as tested by standard
probes. External protection is required for dust, dirt, water, and foreign
objects of less than 12.5 mm in diameter.
Electromagnetic Compatibility — Immunity1 per EN50082-21
EN 61000-4-2 (IEC 801-2)
Electrostatic discharge
8 kV air discharge to all surfaces and communication port
EN 50140 (IEC 801-3)
Radiated electromagnetic field
80 MHz to 1 GHz 10 V/m, 80% modulation with 1 kHz signal
EN 50141
Conducted disturbances
0.15 to 80 MHz 10 V RMS
80% amplitude modulation at 1kHz
EN 50204
Digital telephone immunity
900 MHz ± 5 MHz, 10 V/m, 50% duty cycle, 200 Hz repetition frequency
EN 61000-4-4 (IEC 801-4)
Fast transient bursts
2 kV, 5 kHz with coupling network to AC and DC system power
2 kV, 5 kHz with coupling clamp to digital I/O and communications
EN 61000-4-5 (IEC 801-5)
Surge immunity
2 kV asymmetrical, 1 kV symmetrical
5 positive/5 negative pulses 0°, +90°, -90° phase angle
(24 VDC circuits require external surge protection)
VDE 0160 Non-periodic overvoltage
at 85 VAC line, 90° phase angle, apply 390 V peak, 1.3 ms pulse
at 180 VAC line, 90° phase angle, apply 750 V peak, 1.3 ms pulse
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
A-3
S7-200 Specifications
Table A-1
Technical Specifications for the S7-200 Family
Electromagnetic Compatibility — Conducted and Radiated Emissions per EN50081 -12 and -2
EN 55011, Class A, Group 1, conducted1
0.15 MHz to 0.5 MHz
< 79 dB (µV) Quasi-peak; < 66 dB (µV) Average
0.5 MHz to 5 MHz
< 73 dB (µV) Quasi-peak; < 60 dB (µV) Average
5 MHz to 30 MHz
< 73 dB (µV) Quasi-peak; < 60 dB (µV) Average
EN 55011, Class A, Group 1, radiated1
30 MHz to 230 kHz
30 dB (µV/m) Quasi-peak; measured at 30 m
230 MHz to 1 GHz
37 dB (µV/m) Quasi-peak; measured at 30 m
EN 55011, Class B, Group 1, conducted2
0.15 to 0.5 MHz
<66 dB (µV) Quasi-peak decreasing with log frequency to 56 dB (µV);
< 56 dB (µV) Average decreasing with log frequency to 46 dB (µV)
0.5 MHz to 5 MHz
< 56 dB (µV) Quasi-peak; < 46 dB (µV) Average
5 MHz to 30 MHz
< 60 dB (µV) Quasi-peak; < 50 dB (µV) Average
EN 55011, Class B, Group 1, radiated2
30 MHz to 230 kHz
30 dB (µV/m) Quasi-peak; measured at 10 m
230 MHz to 1 GHz
37 dB (µV/m) Quasi-peak; measured at 10 m
High Potential Isolation Test
24 V/5 V nominal circuits
500 VAC (optical isolation boundaries)
115/230 V circuits to ground
1,500 VAC
115/230 V circuits to 115/230 V circuits
1,500 VAC
230 V circuits to 24 V/5 V circuits
1,500 VAC
115 V circuits to 24 V/5 V circuits
1,500 VAC
1
2
Unit must be mounted on a grounded metallic frame with the S7-200 ground connection made directly to the mounting
metal. Cables are routed along metallic supports.
Unit must be mounted in a grounded metal enclosure. AC input power line must be equipped with a SIEMENS
B84115-E-A30 filter or equivalent, 25. cm max. wire length from filters to the S7-200. The 24 VDC supply and sensor supply
wiring must be shielded.
A-4
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
S7-200 Specifications
Relay Electrical Service Life
Figure A-1 shows typical performance data supplied by relay vendors. Actual
performance may vary depending upon your specific application.
4000
250 VAC resistive load
30 VDC resistive load
1000
500
300
100
250 VAC inductive load (p.f.=0.4)
30 VDC inductive load (L/R=7ms)
0
Figure A-1
1 2 3 4 5 6 7
Rated Operating Current (A)
Electrical Service Life
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
A-5
S7-200 Specifications
A.2
Table A-2
Specifications for the CPU 221
Specifications for CPU 221 DC/DC/DC and CPU 221 AC/DC/Relay
Description
Order Number
CPU 221 DC/DC/DC
6ES7 211-0AA20-0XBO
CPU 221 AC/DC/Relay
6ES7 211-0BA20-0XB0
Physical Size
Dimensions (W x H x D)
90 mm x 80 mm x 62 mm
90 mm x 80 mm x 62 mm
Weight
270 g
310 g
Power loss (dissipation)
4W
6W
On-board digital inputs
6 inputs
6 inputs
On-board digital output
4 outputs
4 outputs
4 High-speed counters
4, each at 20 kHz clock rate
2, each at 20 kHz clock rate
4 High-speed counters
4, each at 20 kHz clock rate
2, each at 20 kHz clock rate
Pulse outputs
2 at 20 kHz pulse rate
2 at 20 kHz pulse rate
Analog adjustments
1 with 8 bit resolution
1 with 8 bit resolution
Timed interrupts
2 with 1 ms resolution
2 with 1 ms resolution
Edge interrupts
4 edge up and/or 4 edge down
4 edge up and/or 4 edge down
Selectable input filter times
7 ranges from 0.2 ms to 12.8 ms
7 ranges from 0.2 ms to 12.8 ms
Pulse catch
6 pulse catch inputs
6 pulse catch inputs
Program size (stored permanently)
2048 words
2048 words
Data block size:
Stored permanently
Backed by super capacitor or battery
1024 words
1024 words
1024 words
1024 words
1024 words
1024 words
Maximum digital I/O
10 points
10 points
Internal memory bits
Stored permanently on power down
Backed by super capacitor or battery
256 bits
112 bits
256 bits
256 bits
112 bits
256 bits
Timers total
Backed by super capacitor or battery
1 ms
10 ms
100 ms
256 timers
64 timers
4 timers
16 timers
236 timers
256 timers
64 timers
4 timers
16 timers
236 timers
Counters total
Backed by super capacitor or battery
256 counters
256 counters
256 counters
256 counters
Boolean execution speed
0.37 µs per instruction
0.37 µs per instruction
Move Word execution speed
34 µs per instruction
34 µs per instruction
Timer/Counter execution speed
50 µs to 64 µs per instruction
50 µs to 64 µs per instruction
Single precision math execution speed
46 µs per instruction
46 µs per instruction
Real math execution speed
100 µs to 400 µs per instruction
100 µs to 400 µs per instruction
Super capacitor data retention time
50 hours, typical, 8 hours min. at 40° C
50 hours, typical, 8 hours min. at 40° C
CPU Features
High-speed counters (32-bit value)
Total
No. of single phase counters
No. of two phase counters
A-6
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
S7-200 Specifications
Table A-2
Specifications for CPU 221 DC/DC/DC and CPU 221 AC/DC/Relay
Description
Order Number
CPU 221 DC/DC/DC
6ES7 211-0AA20-0XBO
CPU 221 AC/DC/Relay
6ES7 211-0BA20-0XB0
On-board Communication
Number of ports
1 port
1 port
Electrical interface
RS-485
RS-485
Isolation (external signal to logic circuit)
Not isolated
Not isolated
PPI/MPI baud rates
9.6, 19.2, and 187.5 kbaud
9.6, 19.2, and 187.5 kbaud
Freeport baud rates
0.3, 0.6, 1.2, 2.4, 4.8, 9.6, 19.2, and
38.4 kbaud
0.3, 0.6, 1.2, 2.4, 4.8, 9.6, 19.2, and
38.4 kbaud
Maximum cable length per segment
up to 38.4 kbaud
187.5 kbaud
1200 m
1000 m
1200 m
1000 m
Maximum number of stations
Per segment
Per network
32 stations
126 stations
32 stations
126 stations
Maximum number of masters
32 masters
32 masters
PPI master mode (NETR/NETW)
Yes
Yes
MPI connections
4 total; 2 reserved: 1 for PG and 1 OP
4 total; 2 reserved: 1 for PG and 1 OP
Memory cartridge (permanent storage)
Program, data, and configuration
Program, data, and configuration
Battery cartridge (data retention time)
200 days, typical
200 days, typical
Clock cartridge (clock accuracy)
2 minutes per month at 25° C
7 minutes per month 0° C to 55° C
2 minutes per month at 25° C
7 minutes per month 0° C to 55° C
Line voltage-permissible range
20.4 to 28.8 VDC
85 to 264 VAC
47 to 63 Hz
Input current CPU only/max load
70/600 mA at 24 VDC
25/80 mA at 240 VAC
25/180 mA at 120 VAC
In rush current (max)
10 A at 28.8 VDC
20 A at 264 VAC
Isolation (input power to logic)
Not isolated
1500 VAC
Hold up time (from loss of input power)
10 ms at 24 VDC
80 ms at 240 VAC, 20 ms at 120 VAC
Internal fuse, not user-replaceable
2 A, 250 V, Slow Blow
2 A, 250 V, Slow Blow
Voltage range
15.4 to 28.8 VDC
20.4 to 28.8 VDC
Maximum current
180 mA
180 mA
Ripple noise
Same as input line
Less than 1 V peak-to-peak (maximum)
Current limit
600 mA
600 mA
Isolation (sensor power to logic circuit)
Not isolated
Not isolated
Cartridge Options
Power Supply
24 VDC Sensor Power Output
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
A-7
S7-200 Specifications
Table A-2
Specifications for CPU 221 DC/DC/DC and CPU 221 AC/DC/Relay
Description
Order Number
CPU 221 DC/DC/DC
6ES7 211-0AA20-0XBO
CPU 221 AC/DC/Relay
6ES7 211-0BA20-0XB0
Input Features
Number of integrated inputs
6 inputs
6 inputs
Input type
Sink/Source (IEC Type 1 sink)
Sink/Source (IEC Type 1 sink)
Maximum continuous permissible
30 VDC
30 VDC
Surge
35 VDC for 0.5 s
35 VDC for 0.5 s
Rated value
24 VDC at 4 mA, nominal
24 VDC at 4 mA, nominal
Logic 1 signal (minimum)
15 VDC at 2.5 mA, minimum
15 VDC at 2.5 mA, minimum
Logic 0 signal (maximum)
5 VDC at 1 mA, maximum
5 VDC at 1 mA, maximum
Optical isolation (galvanic)
500 VAC for 1 minute
500 VAC for 1 minute
Isolation groups of
4 points/2 points
4 points/2 points
0.2 to 12.8 ms, user-selectable
0.2 to 12.8 ms, user-selectable
Logic 1 Level = 15 to 30 VDC
20 kHz
20 kHz
Logic 1 Level = 15 to 26 VDC
30 kHz
30 kHz
Logic 1 Level = 15 to 30 VDC
10 kHz
10 kHz
Logic 1 Level = 15 to 26 VDC
20 kHz
20 kHz
1 mA, maximum
1 mA, maximum
Unshielded (not HSC)
300 m
300 m
Shielded
500 m
500 m
HSC inputs, shielded
50 m
50 m
40 ° C
6
6
55 ° C
6
6
Number of integrated outputs
4 outputs
4 outputs
Output type
Solid State-MOSFET
Relay, dry contact
Permissible range
20.4 to 28.8 VDC
5 to 30 VDC or 5 to 250 VAC
Rated value
24 VDC
-
Logic 1 signal at maximum current
20 VDC, minimum
-
Logic 0 signal with 10 K Ω load
0.1 VDC, maximum
-
Logic 1 signal
0.75 A
2.00 A
Number of output groups
1
2
Number of outputs ON (maximum)
4
4
Per group - horizontal mounting (maximum)
4
3 and 1
Per group - vertical mounting (maximum)
4
3 and 1
Maximum current per common/group
3.0 A
6.0 A
Lamp load
5.0 W
30 W DC/200 W AC
ON state resistance (contact resistance)
0.3 Ω
0.002 Ω, maximum when new
Leakage current per point
10 µA, maximum
-
Surge current
8 A for 100 ms, maximum
7 A with contacts closed
Overload protection
No
No
Input Voltage
Isolation (Field Side to Logic Circuit)
Input Delay Times
Filtered Inputs and Interrupt Inputs
HSC Clock Input Rate
Single Phase
Quadrature
Connection of 2-Wire Proximity Sensor (Bero)
Permissible leakage current
Cable Length
Number of Inputs ON Simultaneously
Output Features
Output Voltage
Output Current
A-8
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
S7-200 Specifications
Table A-2
Specifications for CPU 221 DC/DC/DC and CPU 221 AC/DC/Relay
Description
Order Number
CPU 221 DC/DC/DC
6ES7 211-0AA20-0XBO
CPU 221 AC/DC/Relay
6ES7 211-0BA20-0XB0
Isolation
Optical isolation (galvanic)
500 VAC for 1 minute
Isolation resistance
-
100 M Ω, minimum when new
Isolation coil to contact
-
1500 VAC for 1 minute
Isolation between open contacts
-
750 VAC for 1 minute
In groups of
4 points
3 points and 1 point
1 W, all channels
-
L+ minus 48 V
-
2 µs, maximum
-
-
Inductive Load Clamping
Repetitive
Energy dissipation <
0.5 LI2 x switching rate
Clamp voltage limits
Output Delay
Off to On (Q0.0 and Q0.1)
On to Off (Q0.0 and Q0.1)
Off to On (Q0.2 and Q0.3)
10 µs, maximum
15 µs, maximum
-
100 µs, maximum
-
20 kHz, maximum
1 Hz, maximum
Switching delay
-
10 ms, maximum
Lifetime mechanical (no load)
-
10,000,000 open/close cycles
Lifetime contacts at rated Load
-
100,000 open/close cycles
Unshielded
150 m
150 m
Shielded
500 m
500 m
On to Off (Q0.2 and Q0.3)
Switching Frequency (Pulse Train Outputs)
Q0.0 and Q0.1
Relay
Cable Length
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
A-9
S7-200 Specifications
24 VDC Power,
Ground and Output
Terminals
+
M
L+
Note:
1. Actual component values may vary.
2. Either polarity accepted.
3. Optional ground.
0.0
0.1
0.2
0.3
24 VDC
Power Supply
Input
+
M
L+DC
M
L+
36V
5.6K Ω
1K Ω
1M
0.0
0.1
0.2
0.3
2M
0.4
0.5
Sensor Power
Output
24 VDC Common
and 24 VDC Input
Terminals
Figure A-2
+
+
24 VDC
Connector Terminal Identification for CPU 221 DC/DC/DC
Commons and
Relay Output
Terminals
N (-)
N (-)
L (+)
L (+)
1L
0.0
0.1
0.2
120/240 VAC
2L
0.3
2M
0.4
N
L1AC
M
L+
Note:
1. Actual component values may vary.
2. Connect AC line to the L terminal.
3. Either polarity accepted.
4. Optional ground.
1K Ω
5.6K Ω
1M
0.0
0.1
0.2
0.3
0.5
Sensor Power
Output
24 VDC Common
and 24 VDC Input
Terminals
Figure A-3
A-10
+
+
24 VDC
Connector Terminal Identification for CPU 221 AC/DC/Relay
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
S7-200 Specifications
A.3
Table A-3
Specifications for the CPU 222
Specifications for CPU 222 DC/DC/DC and CPU 222 AC/DC/Relay
Description
Order Number
CPU 222 DC/DC/DC
6ES7 212-1AB20-0XB0
CPU 222 AC/DC/Relay
6ES7 212-1BB20-0XB0
Physical Size
Dimensions (W x H x D)
90 mm x 80 mm x 62 mm
90 mm x 80 mm x 62 mm
Weight
270 g
310 g
Power loss (dissipation)
4W
6W
On-board digital inputs
8 inputs
8 inputs
On-board digital outputs
6 outputs
6 outputs
High-speed counters (32 bit value)
Total
Single phase counters
Two phase counters
4 High-speed counters
4, each at 20 kHz clock rate
2, each at 20 kHz clock rate
4 High-speed counters
4, each at 20 kHz clock rate
2, each at 20 kHz clock rate
Pulse outputs
2 at 20 kHz pulse rate
2 at 20 kHz pulse rate
Analog adjustments
1 with 8 bit resolution
1 with 8 bit resolution
Timed interrupts
2 with 1 ms resolution
2 with 1 ms resolution
Edge interrupts
4 edge up and/or 4 edge down
4 edge up and/or 4 edge down
Selectable input filter times
7 ranges from 0.2 ms to 12.8 ms
7 ranges from 0.2 ms to 12.8 ms
Pulse catch
8 pulse catch inputs
8 pulse catch inputs
Program size (stored permanently)
2048 words
2048 words
Data block size
Stored permanently
Backed by super capacitor or battery
1024 words
1024 words
1024 words
1024 words
1024 words
1024 words
Number of expansion I/O modules
2 modules
2 modules
Maximum digital I/O
256 points
256 points
Maximum analog I/O
16 inputs and 16 outputs
16 inputs and 16 outputs
Internal memory bits
Stored permanently on power down
Backed by super capacitor or battery
256 bits
112 bits
256 bits
256 bits
112 bits
256 bits
Timers Total
Backed by super capacitor or battery
1 ms
10 ms
100 ms
256 timers
64 timers
4 timers
16 timers
236 timers
256 timers
64 timers
4 timers
16 timers
236 timers
Counters total
Backed by super capacitor or battery
256 counters
256 counters
256 counters
256 counters
Boolean execution speed
0.37 µs per instruction
0.37 µs per instruction
Move word execution speed
34 µs per instruction
50 µs to 64 µs per instruction
34 µs per instruction
Timer/Counter execution speed
Single precision math execution speed
46 µs per instruction
100 µs to 400 µs per instruction
46 µs per instruction
Real math execution speed
Super capacitor data retention time
50 hours, typical,
8 hours minimum at 40° C
CPU Features
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
50 µs to 64 µs per instruction
100 µs to 400 µs per instruction
50 hours, typical,
8 hours minimum at 40° C
A-11
S7-200 Specifications
Table A-3
Specifications for CPU 222 DC/DC/DC and CPU 222 AC/DC/Relay
Description
Order Number
CPU 222 DC/DC/DC
6ES7 212-1AB20-0XB0
CPU 222 AC/DC/Relay
6ES7 212-1BB20-0XB0
On-board Communication
Number of ports
1 port
1 port
Electrical interface
RS-485
RS-485
Isolation (external signal to logic circuit)
Not isolated
Not isolated
PPI/MPI baud rates
9.6, 19.2, and 187.5 kbaud
9.6, 19.2, and 187.5 kbaud
Freeport baud rates
0.3, 0.6, 1.2, 2.4, 4.8, 9.6, 19.2, and
0.3, 0.6, 1.2, 2.4, 4.8, 9.6, 19.2, and
38.4 kbaud
38.4 kbaud
Maximum cable length per segment
up to 38.4 kbaud
187.5 kbaud
1200 m
1000 m
1200 m
1000 m
Maximum number of stations
Per segment
Per network
32 stations
126 stations
32 stations
126 stations
Maximum number of masters
32 masters
32 masters
PPI master mode (NETR/NETW)
Yes
Yes
MPI connections
4 total, 2 reserved: 1 for PG and 1 OP
4 total, 2 reserved: 1 for PG and 1 OP
Memory cartridge (permanent storage)
Program, Data, and Configuration
Program, Data, and Configuration
Battery cartridge (data retention time)
200 days, typical
200 days, typical
Clock cartridge (clock accuracy)
2 minutes per month at 25° C
7 minutes per month at 0° C to 55° C
2 minutes per month at 25° C
7 minutes per month at 0° C to 55° C
Line voltage-permissible range
20.4 to 28.8 VDC
85 to 264 VAC, 47 to 63 Hz
Input current CPU only/max load
70/600 mA at 24 VDC
25/80 mA at 240 VAC
25/180 mA at 120 VAC
In rush current (maximum)
10 A at 28.8 VDC
20 A at 264 VAC
Isolation (input power to logic)
Not isolated
1500 VAC
Hold up time (from loss of input power)
10 ms at 24 VDC
80 ms at 240 VAC, 20 ms at 120 VAC
Internal Fuse, not user-replaceable
2 A, 250 V, Slow Blow
2 A, 250 V, Slow Blow
+5 Power for Expansion I/O (max)
340 mA
340 mA
Voltage range
15.4 to 28.8 VDC
20.4 to 28.8 VDC
Maximum current
180 mA
180 mA
Ripple noise
Same as input line
Less than 1 V peak to peak (maximum)
Current limit
600 mA
600 mA
Isolation (sensor power to logic circuit)
Not isolated
Not isolated
Cartridge Options
Power Supply
24 VDC Sensor Power Output
A-12
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
S7-200 Specifications
Table A-3
Specifications for CPU 222 DC/DC/DC and CPU 222 AC/DC/Relay
Description
Order Number
CPU 222 DC/DC/DC
6ES7 212-1AB20-0XB0
CPU 222 AC/DC/Relay
6ES7 212-1BB20-0XB0
Input Features
Number of integrated inputs
8 inputs
8 inputs
Input type
Sink/Source (IEC Type 1 sink)
Sink/Source (IEC Type 1 sink)
Maximum continuous permissible
30 VDC
30 VDC
Surge
35 VDC for 0.5 s
35 VDC for 0.5 s
Rated value
24 VDC at 4 mA, nominal
24 VDC at 4 mA, nominal
Logic 1 signal (minimum)
15 VDC at 2.5 mA, minimum
15 VDC at 2.5 mA, minimum
Logic 0 signal (maximum)
5 VDC at 1 mA, maximum
5 VDC at 1 mA, maximum
Optical isolation (Galvanic)
500 VAC for 1 minute
500 VAC for 1 minute
Isolation groups of
4 points
4 points
0.2 to 12.8 ms, user-selectable
0.2 to 12.8 ms, user-selectable
Logic 1 level = 15 to 30 VDC
20 kHz, maximum
20 kHz, maximum
Logic 1 level = 15 to 26 VDC
30 kHz, maximum
30 kHz, maximum
Logic 1 level = 15 to 30 VDC
10 kHz, maximum
10 kHz, maximum
Logic 1 level = 15 to 26 VDC
20 kHz, maximum
20 kHz, maximum
1 mA, maximum
1 mA, maximum
Unshielded (not HSC)
300 m
300 m
Shielded
500 m
500 m
HSC inputs, shielded
50 m
50 m
40 ° C
8
8
55 ° C
8
8
Number of integrated outputs
6 outputs
6 outputs
Output type
Solid State-MOSFET
Relay, dry contact
Permissible range
20.4 to 28.8 VDC
5 to 30 VDC or 5 to 250 VAC
Rated value
24 VDC
-
Logic 1 signal at maximum current
20 VDC, minimum
-
Logic 0 signal with 10 K Ω load
0.1 VDC, maximum
-
Logic 1 signal
0.75 A
2.00 A
Number of output groups
1
2
Number of outputs ON (maximum)
6
6
Per group - horizontal mounting (maximum)
6
3
Per group - vertical mounting (maximum)
6
3
Maximum current per common/group
4.5 A
6A
Lamp load
5W
30 W DC/ 200 W AC
ON state resistance (contact resistance)
0.3 Ω
0.002 Ω, maximum when new
Leakage current per point
10 µA, maximum
-
Surge current
8 A for 100 ms, maximum
7 A with contacts closed
Overload protection
No
No
Input Voltage
Isolation (Field Side to Logic Circuit)
Input Delay Times
Filtered inputs and interrupt inputs
HSC Clock Input Rate
Single Phase
Quadrature
Connection of 2 Wire Proximity Sensor (Bero)
Permissible leakage current
Cable Length
Number of Inputs ON Simultaneously
Output Features
Output Voltage
Output Current
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
A-13
S7-200 Specifications
Table A-3
Specifications for CPU 222 DC/DC/DC and CPU 222 AC/DC/Relay
Description
Order Number
CPU 222 DC/DC/DC
6ES7 212-1AB20-0XB0
CPU 222 AC/DC/Relay
6ES7 212-1BB20-0XB0
Isolation
Optical isolation (galvanic)
500 VAC for 1 minute
Isolation resistance
-
100 M Ω, minimum when new
Isolation coil to contact
-
1500 VAC for 1 minute
Isolation between open contacts
-
750 VAC for 1 minute
In groups of
6 points
3 points
1 W, all channels
-
L+ minus 48V
-
2 µs, maximum
-
-
Inductive Load Clamping
Repetitive
energy dissipation < 0.5 LI2 x
switching rate
Clamp voltage limits
Output Delay
Off to On (Q0.0 and Q0.1)
On to Off (Q0.0 and Q0.1)
Off to On (Q0.2 through Q0.5)
10 µs, maximum
15 µs, maximum
-
100 µs, maximum
-
20 kHz, maximum
1 Hz, maximum
Switching delay
-
10 ms, maximum
Lifetime mechanical (no load)
-
10,000,000 open/close cycles
Lifetime contacts at rated load
-
100,000 open/close cycles
Shielded
150 m
150 m
Unshielded
500 m
500 m
On to Off (Q0.2 through Q0.5)
Switching Frequency (Pulse Train Outputs)
Q0.0 and I0.1
Relay
Cable Length
A-14
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
S7-200 Specifications
24 VDC Power,
Ground and Output
Terminals
+
+
M
24 VDC
Power Supply
Input
L+
Note:
1. Actual component values may vary.
2. Either polarity accepted.
3. Optional ground.
0.0
0.1
0.2
0.3
0.4 0.5
M
L+DC
36V
1K Ω
1M
0.0
0.1
0.2
0.3
5.6K Ω
2M
0.4
0.5
0.6 0.7
M
L+
Sensor Power
Output
24 VDC Common
and 24 VDC Input
Terminals
Figure A-4
+
+
24 VDC
Connector Terminal Identification for CPU 222 DC/DC/DC
Commons and
Relay Output
Terminals
N (-)
N (-)
L (+)
L (+)
1L
0.0
0.1
0.2
120/240 VAC
2L
0.3
0.4 0.5
2M
0.4
0.5
N
L1AC
M
L+
Note:
1. Actual component values may vary.
2. Connect AC line to the L terminal.
3. Either polarity accepted.
4. Optional ground.
1K Ω
5.6K Ω
1M
0.0
0.1
0.2
0.3
0.6
0.7
Sensor Power
Output
24 VDC Common
and 24 VDC Input
Terminals
Figure A-5
+
+
24 VDC
Connector Terminal Identification for CPU 222 AC/DC/Relay
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
A-15
S7-200 Specifications
A.4
Specifications for the CPU 224
Table A-4
Specifications for CPU 224 DC/DC/DC and CPU 224 AC/DC/Relay
Description
Order Number
CPU 224 DC/DC/DC
6ES7 214-1AD20-0XB0
CPU 224 AC/DC/Relay
6ES7 214-1BD20-0XB0
Physical Size
Dimensions (W x H x D)
120.5 mm x 80 mm x 62 mm
120.5 mm x 80 mm x 62 mm
Weight
360 g
410 g
Power loss (dissipation)
8W
9W
On-Board digital inputs
14 inputs
14 inputs
On-Board digital outputs
10 outputs
10 outputs
High speed counters (32 bit value)
Total
Single phase counters
Two phase counters
6 High-speed counters
6, each at 20 kHz clock rate
4, each at 20 kHz clock rate
6 High-speed counters
6, each at 20 kHz clock rate
4, each at 20 kHz clock rate
Pulse outputs
2 at 20 kHz pulse rate
2 at 20 kHz pulse rate
Analog adjustments
2 with 8 bit resolution
2 with 8 bit resolution
Timed interrupts
2 with 1 ms resolution
2 with 1 ms resolution
Edge interrupts
4 edge up and/or 4 edge down
4 edge up and/or 4 edge down
Selectable input filter times
7 ranges from 0.2 ms to 12.8 ms
7 ranges from 0.2 ms to 12.8 ms
Pulse Catch
14 pulse catch inputs
14 pulse catch inputs
Time of Day Clock (clock accuracy)
2 minutes per month at 25° C
7 minutes per month 0° C to 55° C
2 minutes per month at 25° C
7 minutes per month at 0° C to 55° C
Program size (stored permanently)
4096 words
4096 words
Data block size (stored permanently):
Stored permanently
Backed by super capacitor or battery
2560 words
2560 words
2560 words
2560 words
2560 words
2560 words
Number of expansion I/O modules
7 modules
7 modules
Maximum digital I/O
256 points
256 points
Maximum analog I/O
16 inputs and 16 outputs
16 inputs and 16 outputs
Internal memory bits
Stored permanently on power down
Backed by super capacitor or battery
256 bits
112 bits
256 bits
256 bits
112 bits
256 bits
Timers total
Backed by super capacitor or battery
1 ms
10 ms
100 ms
256 timers
64 timers
4 timers
16 timers
236 timers
256 timers
64 timers
4 timers
16 timers
236 timers
Counters total
Backed by super capacitor or battery
256 counters
256 counters
256 counters
256 counters
Boolean execution speed
0.37 µs per instruction
0.37 µs per instruction
Move Word execution speed
34 µs per instruction
34 µs per instruction
Timer/Counter execution speed
50 µs to 64 µs per instruction
50 µs to 64 per µs instruction
Single precision math execution speed
46 µs per instruction
46 µs per instruction
Real math execution speed
100 µs to 400 µs per instruction
100 µs to 400 µs per instruction
Super capacitor data retention time
190 hours, typical,
120 hours minimum at 40° C
190 hours, typical,
120 hours minimum at 40° C
CPU Features
A-16
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
S7-200 Specifications
Table A-4
Specifications for CPU 224 DC/DC/DC and CPU 224 AC/DC/Relay
Description
Order Number
CPU 224 DC/DC/DC
6ES7 214-1AD20-0XB0
CPU 224 AC/DC/Relay
6ES7 214-1BD20-0XB0
On-board Communication
Number of ports
1 port
1 port
Electrical interface
RS-485
RS-485
Isolation (external signal to logic circuit)
Not isolated
Not isolated
PPI/MPI baud rates
9.6, 19.2, and 187.5 kbaud
9.6, 19.2, and 187.5 kbaud
Freeport baud rates
0.3, 0.6, 1.2, 2.4, 4.8, 9.6, 19.2, and
38.4 kbaud
0.3, 0.6, 1.2, 2.4, 4.8, 9.6, 19.2, and
38.4 kbaud
Maximum cable length per segment
up to 38.4 kbaud
187.5 kbaud
1200 m
1000 m
1200 m
1000 m
Maximum number of stations
Per segment
Per Network
32 stations
126 stations
32 stations
126 stations
Maximum number of masters
32 masters
32 masters
PPI master mode (NETR/NETW)
Yes
Yes
MPI connections
4 total, 2 reserved: 1 for PG and 1 OP
4 total, 2 reserved: 1 for PG and 1 OP
Memory cartridge (permanent storage)
Program, Data, and Configuration
Program, Data, and Configuration
Battery cartridge (data retention time)
200 days, typical
200 days, typical
Line voltage-permissible range
20.4 to 28.8 VDC
85 to 264 VAC
47 to 63 Hz
Input current CPU only/max load
120/900 mA at 24 VDC
35/100 mA at 240 VAC
35/220 mA at 120 VAC
In rush current (maximum)
10 A at 28.8 VDC
20 A at 264 VAC
Isolation (input power to logic)
Not isolated
1500 VAC
Hold up time (from loss of input power)
10 ms at 24 VDC
80 ms at 240 VAC, 20 ms at 120 VAC
Internal fuse, not user-replaceable
2 A, 250 V, Slow Blow
2 A, 250 V, Slow Blow
+5 Power for Expansion I/O (max)
660 mA
660 mA
Voltage range
15.4 to 28.8 VDC
20.4 to 28.8 VDC
Maximum current
280 mA
280 mA
Ripple noise
Same as input line
Less than 1 V peak-to-peak (maximum)
Current limit
600 mA
600 mA
Isolation (sensor power to logic circuit)
Not isolated
Not isolated
Cartridge Options
Power Supply
24 VDC Sensor Power Output
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
A-17
S7-200 Specifications
Table A-4
Specifications for CPU 224 DC/DC/DC and CPU 224 AC/DC/Relay
Description
Order Number
CPU 224 DC/DC/DC
6ES7 214-1AD20-0XB0
CPU 224 AC/DC/Relay
6ES7 214-1BD20-0XB0
Input Features
Number of integrated inputs
14 inputs
14 inputs
Input type
Sink/Source (IEC Type 1)
Sink/Source (IEC Type 1)
Maximum continuous permissible
30 VDC
30 VDC
Surge
35 VDC for 0.5 s
35 VDC for 0.5 s
Rated value
24 VDC at 4 mA, nominal
24 VDC at 4 mA, nominal
Logic 1 signal (minimum)
15 VDC at 2.5 mA, minimum
15 VDC at 2.5 mA, minimum
Logic 0 signal (maximum)
5 VDC at 1 mA, maximum
5 VDC at 1 mA, maximum
Optical isolation (galvanic)
500 VAC for 1 minute
500 VAC for 1 minute
Isolation groups of
8 points and 6 points
8 points and 6 points
0.2 to 12.8 ms, user-selectable
0.2 to 12.8 ms, user-selectable
Logic 1 level = 15 to 30 VDC
20 kHz
20 kHz
Logic 1 level = 15 to 26 VDC
30 kHz
30 kHz
Logic 1 level = 15 to 30 VDC
10 kHz
10 kHz
Logic 1 level = 15 to 26 VDC
20 kHz
20 kHz
1 mA, maximum
1 mA, maximum
Unshielded (not HSC)
300 m
300 m
Shielded
500 m
50 m
HSC inputs, shielded
50 m
50 m
40 ° C
14
14
55 ° C
14
14
Number of integrated outputs
10 outputs
10 outputs
Output type
Solid state-MOSFET
Relay, dry contact
Permissible range
20.4 to 28.8 VDC
5 to 30 VDC or 5 to 250 VAC
Rated value
24 VDC
-
Logic 1 signal at maximum current
20 VDC, minimum
-
Logic 0 signal with 10 K Ω load
0.1 VDC, maximum
-
Logic 1 signal
0.75 A
2.00 A
Number of output groups
2
3
Number of outputs ON (maximum)
10
10
Per group - horizontal mounting (maximum)
5
4/3/3
Per group - vertical mounting (maximum)
5
4/3/3
Maximum current per common/group
3.75 A
8A
Lamp load
5W
30 W DC/200 W AC
ON state resistance (contact resistance)
0.3 Ω
0.002 Ω, maximum when new
Leakage current per point
10 µA, maximum
-
Surge current
8 A for 100 ms, maximum
7 A with contacts closed
Overload protection
No
No
Input Voltage
Isolation (Field Side to Logic Circuit)
Input Delay Times
Filtered inputs and interrupt inputs
HSC clock input rate
Single Phase
Quadrature
Connection of 2 Wire Proximity Sensor
(Bero)
Permissible leakage current
Cable Length
Number of Inputs ON Simultaneously
Output Features
Output Voltage
Output Current
A-18
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
S7-200 Specifications
Table A-4
Specifications for CPU 224 DC/DC/DC and CPU 224 AC/DC/Relay
Description
Order Number
CPU 224 DC/DC/DC
6ES7 214-1AD20-0XB0
CPU 224 AC/DC/Relay
6ES7 214-1BD20-0XB0
Isolation (Field Side to Logic)
Optical isolation (galvanic)
500 VAC for 1 minute
Isolation resistance
-
100 M Ω, minimum when new
Isolation coil to contact
-
1500 VAC for 1 minute
Isolation between open contacts
-
750 VAC for 1 minute
In groups of
5 points
4 points/3 points/3 points
1 W, all channels
-
L+ minus 48V
-
2 µs, maximum
-
-
Inductive Load Clamping
Repetitive
Energy dissipation
< 0.5 LI2 x switching rate
Clamp voltage limits
Output Delay
Off to On (Q0.0 and Q0.1)
On to Off (Q0.0 and Q0.1)
Off to On (Q0.2 through Q1.1)
10 µs, maximum
15 µs, maximum
-
100 µs, maximum
-
20 kHz, maximum
1 Hz, maximum
Switching delay
-
10 ms, maximum
Lifetime mechanical (no load)
-
10,000,000 open/close cycles
Lifetime contacts at rated load
-
100,000 open/close cycles
Unshielded
150 m
150 m
Shielded
500 m
500 m
On to Off (Q0.2 through Q1.1)
Switching Frequency (Pulse Train
Outputs)
Q0.0 and I0.1
Relay
Cable Length
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
A-19
S7-200 Specifications
24 VDCPower
24 VDC Power,
Ground and Output
Terminals
Note:
1. Actual component values may vary.
2. Either polarity accepted.
3. Optional ground.
1M
Figure A-6
0.0
0.0
0.1
0.2
0.3
0.4
2M
2L+ 0.5
0.6
0.7
1.0
1.1
+
+
1M 1L+
24 VDC Common
and 24 VDC Input
Terminals
+
M L+DC
36V
1K Ω
0.1
0.2
0.3
0.4
0.5
0.6
0.7
+
5.6K Ω
2M
1.0
1.1
1.2
1.3
Sensor Power
Output
1.4
1.5
+
M
L+
24 VDC
Connector Terminal Identification for CPU 224 DC/DC/DC
120/240 VAC
Commons and
Relay Output
Terminals
N (-)
N (-)
N (-)
L (+)
L (+)
L (+)
1L
0.0
0.1
0.2
0.3
2L
0.4
Note:
1. Actual component values
may vary.
2. Connect AC line to the
L terminal.
3. Either polarity accepted.
4. Optional ground.
Figure A-7
A-20
0.6
3L
1K Ω
1M
24VDC Common
and 24VDC Input
Terminals
0.5
+
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.7
1.0
1.1
1.0
+
1.1
1.2
1.3
L1AC
Sensor Power
Output
5.6K Ω
2M
N
1.4
1.5
M
L+
24VDC
Connector Terminal Identification for CPU 224 AC/DC/Relay
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
S7-200 Specifications
A.5
Table A-5
Specifications for the EM221 Digital Input Module
Specifications for EM221 24 VDC, 8 Digital Input Module
Description
Order Number
EM221 24 VDC, 8 Input
6ES7 221-1BF20-0XA0
Physical Size
Dimensions (W x H x D)
46 x 80 x 62 mm
Weight
150 g
Power loss (dissipation)
2W
Input Features
Number of integrated inputs
8 inputs
Input type
Sink/Source (IEC Type 1 sink)
Input Voltage
Maximum continuous permissible
30 VDC
Surge
35 VDC for 0.5 s
Rated value
24 VDC at 4 mA, nominal
Logic 1 signal (minimum)
15 VDC at 2.5 mA, minimum
Logic 0 signal (maximum)
5 VDC at 1 mA, maximum
Isolation
Optical isolation (galvanic)
500 VAC for 1 minute
Isolation groups of
4 points
Input Delay Times
Maximum
4.5 ms
Connection of 2-Wire Proximity Sensor (Bero)
Permissible leakage current
1 mA, maximum
Cable Length
Unshielded
300 m
Shielded
500 m
Number of Inputs ON Simultaneously
40 ° C
8
55 ° C
8
Power Consumption
From +5 VDC (from I/O bus)
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
30 mA
A-21
S7-200 Specifications
+
24 VDC common and
24 VDC Input
Terminals
1M
Note:
1. Actual component values may vary.
2. Either polarity accepted.
3. Optional ground.
.0
.1
.2
.3
5.6K Ω
1K Ω
2M
.4
.5
.6
.7
24 VDC common and
24 VDC Input
Terminals
Figure A-8
A-22
+
Connector Terminal Identification for EM221 Digital Input 8 x 24 VDC
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
S7-200 Specifications
A.6
Table A-6
Specifications for the EM222 Digital Output Modules
Specifications for EM222 24 VDC Output and Relay Output Modules
Description
Order Number
EM222 24 VDC Output
6ES7 222-1BF20-0XA0
EM222 Relay Output
6ES7 222-1HF20-0XA0
Physical Size
Dimensions (W x H x D)
46 x 80 x 62 mm
46 x 80 x 62 mm
Weight
150 g
170 g
Power loss (dissipation)
2W
2W
Number of outputs
8 points
8 points
Output type
Solid state-MOSFET
Relay, dry contact
Permissible range
20.4 to 28.8 VDC
5 to 30 VDC, or 5 to 250 VAC
Rated value
24 VDC
-
Logic 1 signal at maximum current
20 VDC, minimum
-
Logic 0 signal with 10 K Ω load
0.1 VDC, maximum
-
Logic 1 signal
0.75 A
2.00 A
Number of outputs groups
2
2
Number of outputs on (maximum)
8
8
Per group - horizontal mounting (maximum)
4
4
Per group - vertical mounting (maximum)
4
4
Maximum current per common/group
3A
8A
Lamp load
5W
30 W DC/200 W AC
ON state resistance (contact resistance)
0.3 Ω
0.002 Ω, maximum when new
Leakage current per point
10 µA, maximum
-
Surge current
8 A for 100 ms, maximum
7 A with contacts closed
Overload protection
No
No
Optical isolation (galvanic)
500 VAC for 1 minute
-
Isolation resistance
-
100 M Ω, minimum when new
Isolation coil to contact
-
1500 VAC for 1 minute
Isolation between open contacts
-
750 VAC for 1 minute
In groups of
4 points
4 points
1 W, all channels
-
L+ minus 48 V
-
50 µs, maximum
-
Output Features
Output Voltage
Output Current
Isolation
Inductive Load Clamping
Repetitive
Energy dissipation
< 0.5 LI2 x switching rate
Clamp voltage limits
Output Delay
Off to On
200 µs, maximum
-
Switching delay
-
10 ms, maximum
Lifetime mechanical (no load)
-
10,000,000 open/close cycles
Lifetime contacts at rated load
-
100,000 open/close cycles
Unshielded
150 m
150 m
Shielded
500 m
500 m
From +5 VDC (from I/O bus)
50 mA
40 mA
From L+
-
9 mA per output when ON
L+ coil power voltage range
-
20.4 to 28.8 VDC
On to Off
Relay
Cable Length
Power Consumption
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
A-23
S7-200 Specifications
+
24 VDC Commons and
24 VDC Output
Terminals
1M
1L+ .0
Note:
1. Actual component values may vary.
2. Optional ground.
.1
.2
.3
.5
.6
.7
36V
2M
24 VDC Commons and
24 VDC Output
Terminals
2L+ .4
+
Figure A-9
Connector Terminal Identification for EM222 Digital Output 8 x 24 VDC
N (-)
L (+)
24 VDC Power
Commons and Relay
Output Terminals
Note:
1. Actual component values may vary.
2. Connect AC line to the L terminal.
3. Optional ground.
4. Relay coil power M must connect
to sensor supply M of CPU.
M
L+
1L
.0
.1
.2
.3
2L
.4
.5
.6
.7
Commons and Relay
Output Terminals
N (-)
+
L (+)
Coil Power Figure A-10
A-24
Connector Terminal Identification for EM222 Digital Output 8 x Relay
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
S7-200 Specifications
A.7
Table A-7
Specifications for the EM223 Digital Combination Modules,
8 Inputs/8 Outputs
Specifications for EM223 24 VDC 8 In/8 Out, and EM223 24 VDC 8 In/8 Relay Out
Description
Order Number
EM223 24VDC In/Out
6ES7 223-1BH20-0XA0
EM223 24VDC In/Relay Out
6ES7 223-1PH20-0XA0
Physical Size
Dimensions (W x H x D)
71.2 mm x 80 mm x 62 mm
71.2 mm x 80 mm x 62 mm
Weight
200 g
300 g
Power loss (dissipation)
3W
3W
Number of inputs
8 inputs
8 inputs
Input type
Sink/Source (IEC Type 1 sink)
Sink/Source (IEC Type 1 sink)
Maximum continuous permissible
30 VDC
30 VDC
Surge
35 VDC for 0.5 s
35 VDC for 0.5 s
Rated value
24 VDC at 4 mA, nominal
24 VDC at 4 mA, nominal
Logic 1 signal (minimum)
15 VDC at 2.5 mA, minimum
15 VDC at 2.5 mA, minimum
Logic 0 signal (maximum)
5 VDC at 1 mA, maximum
5 VDC at 1 mA, maximum
Optical isolation (galvanic)
500 VAC for 1 minute
500 VAC for 1 minute
Isolation groups of
4 points
4 points
4.5 ms
4.5 ms
1 mA
1 mA
Unshielded
300 m
300 m
Shielded
500 m
500 m
40 ° C
8
8
55 ° C
8
8
Number of integrated outputs
8 points
8 points
Output type
Solid State-MOSFET
Relay, dry contact
Permissible range
20.4 to 28.8 VDC
5 to 30 VDC or 5 to 250 VAC
Rated value
24 VDC
-
Logic 1 signal at maximum current
20 VDC, minimum
-
Logic 0 signal with 10K Ω load
0.1 VDC, maximum
-
Input Feature
Input Voltage
Isolation
Input Delay TImes
Maximum
Connection of 2-Wire Proximity Sensor (Bero)
Maximum
Cable Length
Number of Inputs On Simultaneously
Output Feature
Output Voltage
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C79000-G7076-C233-01
A-25
S7-200 Specifications
Table A-7
Specifications for EM223 24 VDC 8 In/8 Out, and EM223 24 VDC 8 In/8 Relay Out
Description
Order Number
EM223 24VDC In/Out
6ES7 223-1BH20-0XA0
EM223 24VDC In/Relay Out
6ES7 223-1PH20-0XA0
Output Current
Logic 1 signal
0.75 A
2.00 A
Number of outputs groups
2
2
Number of outputs on (maximum)
8
8
Per group - horizontal mounting (maximum)
4
4
Per group - vertical mounting (maximum)
4
4
Maximum current per common/group
2A
8A
Lamp load
5W
30 W DC/200 W AC
ON state resistance (contact resistance)
0.3 Ω
0.002 Ω, maximum when new
Leakage current per point
10 µA, maximum
-
Surge current
8 A for 100 ms, maximum
7 A with contacts closed
Overload protection
No
No
Optical isolation (galvanic)
500 VAC for 1 minute
-
Isolation resistance
-
100 M Ω, minimum when new
Isolation coil to contact
-
1500 VAC for 1 minute
Isolation between open contacts
-
750 VAC for 1 minute
In groups of
4 points
4 points
1 W, all channels
-
L+ minus 48V
-
50 µs, maximum
-
Isolation
Inductive Load Clamping
Repetitive
Energy dissipation
< 0.5 LI2 x switching rate
Clamp voltage limits
Output Delay
Off to On
200 µs, maximum
-
Switching delay
-
10 ms, maximum
Lifetime mechanical (no load)
-
100,000,000 open/close cycles
Lifetime contacts at rated load
-
100,000 open/close cycles
Unshielded
150 m
150 m
Shielded
500 m
500 m
From +5 VDC (from I/O bus)
100 mA
80 mA
From L+
-
9 mA per output when On
L+ coil power voltage range
-
20.4 to 28.8 VDC
On to Off
Relay
Cable Length
Power Consumption
A-26
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
S7-200 Specifications
+
24 VDC Commons and
24VDC Output Terminals
1M
Note:
1. Actual component values may vary.
2. Either polarity accepted
3. Optional ground.
+
1L+ .0
.1
.2
.3
2M 2L+ .4
.5
.6
.7
.6
.7
36V
470 Ω
5.6 KΩ
1M
.0
.1
.2
.3
2M
.4
.5
24 VDC Commons and
24 VDC Input Terminals
+
+
Figure A-11
Connector Terminal Identification for EM223 Digital Combination 8 x 24 VDC Inputs/8 x 24
VDC Outputs
N (-)
L (+)
Relay Commons and
Relay Output Terminals
1L
.0
.1
.2
.3
2L
.4
.5
.6
.7
.4
.5
.6
.7
Note:
1. Actual component values may vary.
2. Either polarity accepted
3. DC circuit grounds are optional.
4. Relay coil power M must connect to
sensor supply M of CPU.
470 Ω
5.6 KΩ
24 VDC Commons and
24 VDC Input Terminals
M
Coil Power +
L+
1M
+
Figure A-12
.0
.1
.2
.3
2M
+
Connector Terminal Identification for EM223 Digital 8 x 24 VDC Input/8 x Relay Output
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
A-27
S7-200 Specifications
A.8
Optional Cartridges
Order Number
Color
Cartridge Function
6ES7 291 8GE20 0XA0
Gray
User program
6ES7 297 1AA20 0XA0
Blue
Real-Time Clock with battery
6ES7 291 8BA20 0XA0
Orange
Battery Cartridge
Cartridge Options
Memory cartridge storage
Program, Data, and Configuration
Battery cartridge (data retention time)
200 days, typical
Clock cartridge accuracy
2 minutes/month @ 25°C
7 minutes/month @ 0°C to 55°C
Cartridge Weight 3 g
18 mm
10 mm
18 mm
General Features
A-28
Battery
3 V, 30 mA hour, Renata CR 1025
Size
9.9 x 2.5 mm
Type
Lithium < 0.6 g
Shelf life
10 years
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
S7-200 Specifications
A.9
I/O Expansion Cable
Order Number:
6ES7 290-6AA20-0XA0
General Features
Cable length
0.8 m (32 in.)
Weight
25 g (.88 lb.)
Connector type
10 pin ribbon
Typical Installation of the I/O Expansion Cable
Female Connector
Male Connector
Figure A-13
Typical Installation of an I/O Expansion Cable
Note
Only one expansion cable should be included in a CPU/expansion module chain.
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
A-29
S7-200 Specifications
A.10
PC/PPI Cable
Order Number:
6ES7 901-3BF20-0XA0
PC/PPI Cable Dimensions
0.1 m
(4 in.)
0.3 m
(12 in.)
4.6 m
(181 in.)
40 mm
(1.6 in.)
RS-232 COMM
RS-485 COMM
Isolated
PC/PPI Cable
PPI
1
0
Figure A-14
Table A-8
Table A-9
A-30
1 2 3 4 5
Baud
Rate
38.4K
19.2K
9.6K
2.4K
1.2K
PC
123 SWITCH 4
000
001
010 SWITCH 5
100
101
1 = 10 BIT
0 = 11 BIT
1 = DTE
0 = DCE
PC/PPI Cable Dimensions
Baud Rate Switch Selections on the PC/PPI Cable
Baud Rate
Switch (1 = Up)
38400
000
19200
001
9600
010
4800
011
2400
100
1200
101
600
110
Modem Operation for PC/PPI Cable
Modem Operation
Switch (1 = Up)
11-bit modem
0
10-bit modem
1
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
S7-200 Specifications
Table A-10 Pin-out of PC/PPI Cable
Pinout
Switch (1 = Up)
DCE
0
DTE
1
Table A-11 Pin-outs for RS-485 to RS-232 DCE Connector
RS-485 Connector Pin-out
Pin
Number
Signal Description
RS-232 DCE Connector Pin-out
Pin
Number
Signal Description
1
Ground (RS-485 logic ground)
1
Data Carrier Detect (DCD) (not used)
2
24 V Return (RS-485 logic ground)
2
Receive Data (RD)
(output from PC/PPI cable)
3
Signal B (RxD/TxD+)
3
Transmit Data (TD)
(input to PC/PPI cable)
4
RTS (TTL level)
4
Data Terminal Ready (DTR)
(not used)
5
Ground (RS-485 logic ground)
5
Ground (RS-232 logic ground)
6
+5 V (with 100 Ω series resistor)
6
Data Set Ready (DSR) (not used)
7
24 V Supply
7
Request To Send (RTS) (not used)
8
Signal A (RxD/TxD-)
8
Clear To Send (CTS) (not used)
9
Protocol select
9
Ring Indicator (RI) (not used)
Table A-12 Pin-outs for RS-485 to RS-232 DTE Connector
RS-232 DTE Connector Pin-out1
RS-485 Connector Pin-out
Pin
Number
1
Signal Description
Pin
Number
Signal Description
1
Ground (RS-485 logic ground)
1
Data Carrier Detect (DCD) (not used)
2
24 V Return (RS-485 logic ground)
2
Receive Data (RD)
(input to PC/PPI cable)
3
Signal B (RxD/TxD+)
3
Transmit Data (TD)
(output from PC/PPI cable)
4
RTS (TTL level)
4
Data Terminal Ready (DTR)
(not used)
5
Ground (RS-485 logic ground)
5
Ground (RS-232 logic ground)
6
+5 V (with 100 Ω series resistor)
6
Data Set Ready (DSR)
(not used)
7
24 V Supply
7
Request To Send (RTS)
(output from PC/PPI cable)
8
Signal A (RxD/TxD-)
8
Clear To Send (CTS) (not used)
9
Protocol select
9
Ring Indicator (RI) (not used)
A conversion from female to male, and a conversion from 9-pin to 25-pin is required for modems
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
A-31
S7-200 Specifications
A-32
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
B
Error Codes
The information about error codes is provided to help you identify problems with
your S7-200 CPU module.
Chapter Overview
Section
Description
Page
B.1
Fatal Error Codes and Messages
B-2
B.2
Run-Time Programming Problems
B-3
B.3
Compile Rule Violations
B-4
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
B-1
Error Codes
B.1
Fatal Error Codes and Messages
Fatal errors cause the CPU to stop the execution of your program. Depending on
the severity of the error, a fatal error can render the CPU incapable of performing
any or all functions. The objective for handling fatal errors is to bring the CPU to a
safe state from which the CPU can respond to interrogations about the existing
error conditions.
The CPU performs the following tasks when a fatal error is detected:
Changes to STOP mode
Turns on both the System Fault LED and the Stop LED
Turns off the outputs
The CPU remains in this condition until the fatal error is corrected. Table B-1
provides a list with descriptions for the fatal error codes that can be read from the
CPU.
Table B-1
Fatal Error Codes and Messages Read from the CPU
Error Code
B-2
Description
0000
No fatal errors present
0001
User program checksum error
0002
Compiled ladder program checksum error
0003
Scan watchdog time-out error
0004
Internal EEPROM failed
0005
Internal EEPROM checksum error on user program
0006
Internal EEPROM checksum error on configuration parameters
0007
Internal EEPROM checksum error on force data
0008
Internal EEPROM checksum error on default output table values
0009
Internal EEPROM checksum error on user data, DB1
000A
Memory cartridge failed
000B
Memory cartridge checksum error on user program.
000C
Memory cartridge checksum error on configuration parameters
000D
Memory cartridge checksum error on force data
000E
Memory cartridge checksum error on default output table values
000F
Memory cartridge checksum error on user data, DB1
0010
Internal software error
0011
Compare contact indirect addressing error
0012
Compare contact illegal floating point value
0013
Memory cartridge is blank, or the program is not understood by this CPU
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Error Codes
B.2
Run-Time Programming Problems
Your program can create non-fatal error conditions (such as addressing errors)
during the normal execution of the program. In this case, the CPU generates a
non-fatal run-time error code. Table B-2 lists the descriptions of the non-fatal error
codes.
Table B-2
Run-Time Programming Problems
Run-Time Programming Problem (Non-Fatal)
Error Code
0000
No error
0001
HSC box enabled before executing HDEF box
0002
Conflicting assignment of input interrupt to a point already assigned to a
HSC
0003
Conflicting assignment of inputs to an HSC already assigned to input
interrupt or other HSC
0004
Attempted execution of ENI, DISI, or HDEF instructions in an interrupt
routine
0005
Attempted execution of a second HSC/PLS with the same number before
completing the first (HSC/PLS in an interrupt routine conflicts with HSC/PLS
in main program)
0006
Indirect addressing error
0007
TODW (Time-of-Day Write) or TODR (Time-of-Day Read) data error
0008
Maximum user subroutine nesting level exceeded
0009
Execution of a XMT or RCV instruction while a different XMT or RCV
instruction is in progress on Port 0
000A
Attempt to redefine a HSC by executing another HDEF instruction for the
same HSC
000B
Simultaneous execution of XMT/RCV instructions on Port 1
000C
Clock cartridge not present
000D
Attempt to redefine pulse output while it is active
000E
Number of PTO profile segment was set to 0
0091
Range error (with address information): check the operand ranges
0092
Error in count field of an instruction (with count information): verify the
maximum count size
0094
Range error writing to non-volatile memory with address information
009A
Attempt to switch to freeport mode while in a user interrupt
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
B-3
Error Codes
B.3
Compile Rule Violations
When you download a program, the CPU compiles the program. If the CPU
detects that the program violates a compile rule (such as an illegal instruction), the
CPU aborts the download and generates a non-fatal, compile-rule error code.
Table B-3 lists the descriptions of the error codes that are generated by violations
of the compile rules.
Table B-3
Compile Rule Violations
Compile Errors (Non-Fatal)
Error Code
B-4
0080
Program too big to compile; you must reduce the program size.
0081
Stack underflow; you must split network into multiple networks.
0082
Illegal instruction; check instruction mnemonics.
0083
Missing MEND or instruction not allowed in main program: add MEND
instruction, or remove incorrect instruction.
0084
Reserved
0085
Missing FOR; add FOR instruction or delete NEXT instruction.
0086
Missing NEXT; add NEXT instruction or delete FOR instruction.
0087
Missing label (LBL, INT, SBR); add the appropriate label.
0088
Missing RET or instruction not allowed in a subroutine: add RET to the end
of the subroutine or remove incorrect instruction.
0089
Missing RETI or instruction not allowed in an interrupt routine: add RETI to
the end of the interrupt routine or remove incorrect instruction.
008A
Reserved
008B
Reserved
008C
Duplicate label (LBL, INT, SBR); rename one of the labels.
008D
Illegal label (LBL, INT, SBR); ensure the number of labels allowed was not
exceeded.
0090
Illegal parameter; verify the allowed parameters for the instruction.
0091
Range error (with address information); check the operand ranges.
0092
Error in the count field of an instruction (with count information); verify the
maximum count size.
0093
FOR/NEXT nesting level exceeded.
0095
Missing LSCR instruction (Load SCR)
0096
Missing SCRE instruction (SCR End) or disallowed instruction before the
SCRE instruction
0097
User program contains both unnumbered and numbered EU/ED instructions
0098
Run-time edit attempted on a program with unnumbered EU/ED instructions
0099
Too many hidden program segments
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
C
Special Memory (SM) Bits
Special memory bits provide a variety of status and control functions, and also
serve as a means of communicating information between the CPU and your
program. Special memory bits can be used as bits, bytes, words, or double words.
SMB0: Status Bits
As described in Table C-1, SMB0 contains eight status bits that are updated by the
S7-200 CPU at the end of each scan cycle.
Table C-1
Special Memory Byte SMB0 (SM0.0 to SM0.7)
SM Bits
Description
SM0.0
This bit is always on.
SM0.1
This bit is on for the first scan cycle. One use is to call an initialization
subroutine.
SM0.2
This bit is turned on for one scan cycle if retentive data was lost. This bit can
be used as either an error memory bit or as a mechanism to invoke a special
startup sequence.
SM0.3
This bit is turned on for one scan cycle when RUN mode is entered from a
power-up condition. This bit can be used to provide machine warm-up time
before starting an operation.
SM0.4
This bit provides a clock pulse that is on for 30 seconds and off for 30
seconds, for a duty cycle time of 1 minute. It provides an easy-to-use delay, or
a 1-minute clock pulse.
SM0.5
This bit provides a clock pulse that is on for 0.5 seconds and then off for 0.5
seconds, for a duty cycle time of 1 second. It provides an easy-to-use delay
or a 1-second clock pulse.
SM0.6
This bit is a scan cycle clock which is on for one scan cycle and then off for
the next scan cycle. This bit can be used as a scan counter input.
SM0.7
This bit reflects the position of the Mode switch (off is TERM position, and on
is RUN position). If you use this bit to enable Freeport mode when the switch
is in the RUN position, normal communication with the programming device
can be enabled by switching to the TERM position.
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
C-1
Special Memory (SM) Bits
SMB1: Status Bits
As described in Table C-2, SMB1 contains various potential error indicators. These
bits are set and reset by instructions at execution time.
Table C-2
Special Memory Byte SMB1 (SM1.0 to SM1.7)
SM Bits
Description
SM1.0
This bit is turned on by the execution of certain instructions when the result of
the operation is zero.
SM1.1
This bit is turned on by the execution of certain instructions either when an
overflow results or when an illegal numeric value is detected.
SM1.2
This bit is turned on when a negative result is produced by a math operation.
SM1.3
This bit is turned on when division by zero is attempted.
SM1.4
This bit is turned on when the Add to Table instruction attempts to overfill the
table.
SM1.5
This bit is turned on when either LIFO or FIFO instructions attempt to read
from an empty table.
SM1.6
This bit is turned on when an attempt to convert a non-BCD value to binary is
made.
SM1.7
This bit is turned on when an ASCII value cannot be converted to a valid
hexadecimal value.
SMB2: Freeport Receive Character
SMB2 is the Freeport receive character buffer. As described in Table C-3, each
character received while in Freeport mode is placed in this location for easy access
from the ladder logic program.
Table C-3
Special Memory Byte SMB2
Description
SM Byte
SMB2
This byte contains each character that is received from Port 0 or Port 1 during
Freeport communication.
SMB3: Freeport Parity Error
SMB3 is used for Freeport mode and contains a parity error bit that is set when a
parity error is detected on a received character. As shown in Table C-4, SM3.0
turns on when a parity error is detected. Use this bit to discard the message.
C-2
Table C-4
Special Memory Byte SMB3 (SM3.0 to SM3.7)
SM Bits
Description
SM3.0
Parity error from Port 0 or Port 1 (0 = no error; 1 = error was detected)
SM3.1 to
SM3.7
Reserved
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Special Memory (SM) Bits
SMB4: Queue Overflow
As described in Table C-5, SMB4 contains the interrupt queue overflow bits, a
status indicator showing whether interrupts are enabled or disabled, and a
transmitter-idle memory bit. The queue overflow bits indicate either that interrupts
are happening at a rate greater than can be processed, or that interrupts were
disabled with the global interrupt disable instruction.
Table C-5
Special Memory Byte SMB4 (SM4.0 to SM4.7)
SM Bits
Description
SM4.01
This bit is turned on when the communication interrupt queue has overflowed.
SM4.11
This bit is turned on when the input interrupt queue has overflowed.
SM4.21
This bit is turned on when the timed interrupt queue has overflowed.
SM4.3
This bit is turned on when a run-time programming problem is detected.
SM4.4
This bit reflects the global interrupt enable state. It is turned on when
interrupts are enabled.
SM4.5
This bit is turned on when the transmitter is idle (Port 0).
SM4.6
This bit is turned on when the transmitter is idle (Port 1).
SM4.7
This bit is turned on when something is forced.
1
Use status bits 4.0, 4.1, and 4.2 only in an interrupt routine. These status bits are reset when
the queue is emptied, and control is returned to the main program.
SMB5: I/O Status
As described in Table C-6, SMB5 contains status bits about error conditions that
were detected in the I/O system. These bits provide an overview of the I/O errors
detected.
Table C-6
Special Memory Byte SMB5 (SM5.0 to SM5.7)
SM Bits
Description
SM5.0
This bit is turned on if any I/O errors are present.
SM5.1
This bit is turned on if too many digital I/O points have been connected to the
I/O bus.
SM5.2
This bit is turned on if too many analog I/O points have been connected to the
I/O bus.
SM5.3 to
SM5.6
Reserved.
SM5.7
This bit is turned on if a DP standard bus fault is present
S7-200 Programmable Controller System Manual
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C-3
Special Memory (SM) Bits
SMB6: CPU ID Register
As described in Table C-7, SMB6 is the CPU identification register. SM6.4 to
SM6.7 identify the type of CPU. SM6.0 to SM6.3 are reserved for future use.
Table C-7
Special Memory Byte SMB6
Description
SM Bits
Format
MSB
7
x
SM6.4 to
SM6.7
SM6.0 to
SM6.3
LSB
0
x
x
x
xxxx = 0000 =
0010 =
0110 =
1000 =
1001 =
r
r
r
r
CPU ID register
CPU 212/CPU 222
CPU 214/CPU 224
CPU 221
CPU 215
CPU 216
Reserved
SMB7: Reserved
SMB7 is reserved for future use.
C-4
S7-200 Programmable Controller System Manual
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Special Memory (SM) Bits
SMB8 to SMB21: I/O Module ID and Error Registers
SMB8 through SMB21 are organized in byte pairs for expansion modules 0 to 6.
As described in Table C-8, the even-numbered byte of each pair is the
module-identification register. These bytes identify the module type, the I/O type,
and the number of inputs and outputs. The odd-numbered byte of each pair is the
module error register. These bytes provide an indication of any errors detected in
the I/O for that module.
Table C-8
Special Memory Bytes SMB8 to SMB21
Description
SM Byte
Format
Even-Number Byte: Module ID Register Odd-Number Byte: Module Error Register
MSB
7
M
M:
tt:
A
ii
LSB
0
t
t
A
i
i
Q Q
Module present 0 = Present
1 = Not present
00
01
10
11
Non-intelligent I/O module
Intelligent module
Reserved
Reserved
I/O type
00
01
10
11
QQ 00
01
10
11
0 = Discrete
1 = Analog
No inputs
2 AI or 8 DI
4 AI or 16 DI
8 AI or 32 DI
MSB
7
LSB
0
C ie 0
b
r
P
f
t
C:
Configuration error
ie
intelligent module error
0 = no error
1 = error
b:
bus fault or parity error
r:
Out-of-range error
P:
No user power error
f:
Blown fuse error
t:
Terminal block loose error
No outputs
2 AQ or 8 DQ
4 AQ or 16 DQ
8 AQ or 32 DQ
SMB8
SMB9
Module 0 ID register
Module 0 error register
SMB10
SMB11
Module 1 ID register
Module 1 error register
SMB12
SMB13
Module 2 ID register
Module 2 error register
SMB14
SMB15
Module 3 ID register
Module 3 error register
SMB16
SMB17
Module 4 ID register
Module 4 error register
SMB18
SMB19
Module 5 ID register
Module 5 error register
SMB20
SMB21
Module 6 ID register
Module 6 error register
S7-200 Programmable Controller System Manual
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C-5
Special Memory (SM) Bits
SMW22 to SMW26: Scan Times
As described in Table C-9, SMW22, SMW24, and SMW26 provide scan time
information: minimum scan time, maximum scan time, and last scan time in
milliseconds.
Table C-9
Special Memory Words SMW22 to SMW26
Description
SM Word
SMW22
This word provides the scan time of the last scan cycle.
SMW24
This word provides the minimum scan time recorded since entering the RUN
mode.
SMW26
This word provides the maximum scan time recorded since entering the
RUN mode.
SMB28 and SMB29: Analog Adjustment
As described in Table C-10, SMB28 holds the digital value that represents the
position of analog adjustment 0. SMB29 holds the digital value that represents the
position of analog adjustment 1.
Table C-10 Special Memory Bytes SMB28 and SMB29
SM Byte
Description
SMB28
This byte stores the value entered with analog adjustment 0. This value is
updated once per scan in STOP/RUN.
SMB29
This byte stores the value entered with analog adjustment 1. This value is
updated once per scan in STOP/RUN.
SMB30 and SMB130: Freeport Control Registers
SMB30 controls the Freeport communication for port 0; SMB130 controls the
Freeport communication for port 1. You can read and write to SMB30 and
SMB130. As described in Table C-11, these bytes configure the respective
communication port for Freeport operation and provide selection of either Freeport
or system protocol support.
C-6
S7-200 Programmable Controller System Manual
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Special Memory (SM) Bits
Table C-11 Special Memory Byte SMB30
Port 0
Port 1
Format of
SMB30
Format of
SMB130
Description
MSB
7
p
LSB
0
p
d
b
b
Freeport mode control byte
b m m
SM30.6
and
SM30.7
SM130.6
and
SM130.7
pp
Parity select
00 =
no parity
01 =
even parity
10 =
no parity
11 =
odd parity
SM30.5
SM130.5
d
Data bits per character
0=
8 bits per character
1=
7 bits per character
SM30.2 to
SM30.4
SM130.2
to
SM130.4
bbb Freeport Baud rate
000 = 38,400 baud
001 = 19,200 baud
010 = 9,600 baud
011 = 4,800 baud
100 = 2,400 baud
101 = 1,200 baud
110 = 600 baud
111 = 300 baud
SM30.0
and
SM30.1
SM130.0
and
SM130.1
mm Protocol selection
00 =
Point-to-Point Interface protocol (PPI/slave mode)
01 =
Freeport protocol
10 =
PPI/master mode
11 =
Reserved (defaults to PPI/slave mode)
Note: When you select code mm = 10 (PPI master), the PLC will
become a master on the network and allow the NETR and
NETW instructions to be executed. Bits 2 through 7 are ignored
in PPI modes.
SMB31 and SMW32: Permanent Memory (EEPROM) Write Control
You can save a value stored in V memory to permanent memory (EEPROM) under
the control of your program. To do this, load the address of the location to be
saved in SMW32. Then, load SMB31 with the command to save the value. Once
you have loaded the command to save the value, you do not change the value in V
memory until the CPU resets SM31.7, indicating that the save operation is
complete.
At the end of each scan, the CPU checks to see if a command to save a value to
permanent memory was issued. If the command was issued, the specified value is
saved to permanent memory.
S7-200 Programmable Controller System Manual
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C-7
Special Memory (SM) Bits
As described in Table C-12, SMB31 defines the size of the data to be saved to
permanent memory and also provides the command that initiates the execution of
a save operation. SMW32 stores the starting address in V memory for the data to
be saved to permanent memory.
Table C-12 Special Memory Byte SMB31 and Special Memory Word SMW32
Description
SM Byte
Format
SMB31:
Software
command
MSB
7
SMW32:
V memory
address
MSB
15
c
LSB
0
0
0
0
0
0
s
s
LSB
0
V memory address
SM31.0
and
SM31.1
ss:
Size of the value to be saved
00 = byte
01 = byte
10 = word
11 = double word
SM31.7
c:
Save to permanent memory (EEPROM)
0 = No request for a save operation to be performed
1 = User program requests that the CPU save data to permanent
memory.
The CPU resets this bit after each save operation.
SMW32
The V memory address for the data to be saved is stored in SMW32. This
value is entered as an offset from V0. When a save operation is executed, the
value in this V memory address is saved to the corresponding V memory
location in the permanent memory (EEPROM).
SMB34 and SMB35: Time Interval Registers for Timed Interrupts
As described in Table C-13, SMB34 specifies the time interval for timed interrupt 0,
and SMB35 specifies the time interval for timed interrupt 1. You can specify the
time interval (in 1-ms increments) from 1 ms to 255 ms. The time-interval value is
captured by the CPU at the time the corresponding timed interrupt event is
attached to an interrupt routine. To change the time interval, you must reattach the
timed interrupt event to the same or to a different interrupt routine. You can
terminate the timed interrupt event by detaching the event.
Table C-13 Special Memory Bytes SMB34 and SMB35
SM Byte
C-8
Description
SMB34
This byte specifies the time interval (in 1-ms increments from 1 ms to
255 ms) for timed interrupt 0.
SMB35
This byte specifies the time interval (in 1-ms increments from 1 ms to
255 ms) for timed interrupt 1.
S7-200 Programmable Controller System Manual
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Special Memory (SM) Bits
SMB36 to SMB65: HSC0, HSC1, and HSC2 Register
As described in Table C-14, SMB36 through SM65 are used to monitor and control
the operation of high-speed counters HSC0, HSC1, and HSC2.
Table C-14 Special Memory Bytes SMB36 to SMB65
Description
SM Byte
SM36.0 to
SM36.4
Reserved
SM36.5
HSC0 current counting direction status bit: 1 = counting up
SM36.6
HSC0 current value equals preset value status bit: 1 = equal
SM36.7
HSC0 current value is greater than preset value status bit: 1 = greater than
SM37.0
Active level control bit for Reset:
0= Reset is active high, 1 = Reset is active low
SM37.1
Reserved
SM37.2
Counting rate selection for quadrature counters:
0 = 4x counting rate; 1 = 1 x counting rate
SM37.3
HSC0 direction control bit: 1 = count up
SM37.4
HSC0 update the direction: 1 = update direction
SM37.5
HSC0 update the preset value: 1 = write new preset value to HSC0 preset
SM37.6
HSC0 update the current value: 1 = write new current value to HSC0 current
SM37.7
HSC0 enable bit: 1 = enable
SMB38
HSC0 new current value
SMB39
SMB38 is most significant byte, and SMB41 is least significant byte.
SMB40
SMB41
SMB42
HSC0 new preset value
SMB43
SMB42 is most significant byte, and SMB45 is least significant byte.
SMB44
SMB45
SM46.0 to
SM46.4
Reserved
SM46.5
HSC1 current counting direction status bit: 1 = counting up
SM46.6
HSC1 current value equals preset value status bit: 1 = equal
SM46.7
HSC1 current value is greater than preset value status bit: 1 = greater than
SM47.0
HSC1 active level control bit for reset: 0 = active high, 1 = active low
SM47.1
HSC1 active level control bit for start: 0 = active high, 1 = active low
SM47.2
HSC1 quadrature counter rate selection: 0 = 4x rate, 1 = 1x rate
SM47.3
HSC1 direction control bit: 1 = count up
SM47.4
HSC1 update the direction: 1 = update direction
SM47.5
HSC1 update the preset value: 1 = write new preset value to HSC1 preset
SM47.6
HSC1 update the current value: 1 = write new current value to HSC1 current
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C-9
Special Memory (SM) Bits
Table C-14 Special Memory Bytes SMB36 to SMB65
SM Byte
Description
SM47.7
HSC1 enable bit: 1 = enable
SMB48
HSC1 new current value
SMB49
SMB48 is most significant byte, and SMB51 is least significant byte.
SMB50
SMB51
SMB52 to
HSC1 new preset value
SMB55
SMB52 is most significant byte, and SMB55 is least significant byte.
SM56.0 to
SM56.4
Reserved
SM56.5
HSC2 current counting direction status bit: 1 = counting up
SM56.6
HSC2 current value equals preset value status bit: 1 = equal
SM56.7
HSC2 current value is greater than preset value status bit: 1 = greater than
SM57.0
HSC2 active level control bit for reset: 0 = active high, 1 = active low
SM57.1
HSC2 active level control bit for start: 0 = active high, 1 = active low
SM57.2
HSC2 quadrature counter rate selection: 0 = 4x rate, 1 = 1x rate
SM57.3
HSC2 direction control bit: 1 = count up
SM57.4
HSC2 update the direction: 1 = update direction
SM57.5
HSC2 update the preset value: 1 = write new preset value to HSC2 preset
SM57.6
HSC2 update the current value: 1 = write new current value to HSC2 current
SM57.7
HSC2 enable bit: 1 = enable
SMB58
HSC2 new current value
SMB59
SMB58 is the most significant byte, and SMB61 is the least significant byte.
SMB60
SMB61
SMB62
HSC2 new preset value
SMB63
SMB62 is the most significant byte, and SMB65 is the least significant byte.
SMB64
SMB65
C-10
S7-200 Programmable Controller System Manual
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Special Memory (SM) Bits
SMB66 to SMB85: PTO/PWM Registers
As described in Table C-15, SMB66 through SMB85 are used to monitor and
control the pulse train output and pulse width modulation functions. See the
information on high-speed output instructions in Section 9.5 in Chapter 9 for a
complete description of these bits.
Table C-15 Special Memory Bytes SMB66 to SMB85
Description
SM Byte
SM66.0 to
SM66.3
Reserved
SM66.4
PTO0 profile aborted;
0 = no error, 1 = aborted due to a delta calculation error
SM66.5
PTO0 profile aborted;
0 = not aborted by user command, 1 = aborted by user command
SM66.6
PTO0 pipeline overflow (cleared by the system when using external profiles,
otherwise must be reset by user); 0 = no overflow, 1 = pipeline overflow
SM66.7
PTO0 idle bit: 0 = PTO in progress, 1 = PTO idle
SM67.0
PTO0/PWM0 update the cycle time value: 1 = write new cycle time
SM67.1
PWM0 update the pulse width value: 1 = write new pulse width
SM67.2
PTO0 update the pulse count value: 1 = write new pulse count
SM67.3
PTO0/PWM0 time base: 0 = 1 µs/tick, 1 = 1 ms/tick
SM67.4
Update PWM0 synchronously:
0 = asynchronous update, 1 = synchronous update
SM67.5
PTO0 operation: 0 = single segment operation (cycle time and pulse count
stored in SM memory), 1 = multiple segment operation (profile table stored in
V memory)
SM67.6
PTO0/PWM0 mode select: 0 = PTO, 1 = PWM
SM67.7
PTO0/PWM0 enable bit: 1 = enable
SMB68
PTO0/PWM0 cycle time value (2 to 65,535 units of time base);
SMB69
SMB68 is most significant byte, and SMB69 is least significant byte.
SMB70
PWM0 pulse width value (0 to 65,535 units of the time base);
SMB71
SMB70 is most significant byte, and SMB71 is least significant byte.
SMB72
PTO0 pulse count value (1 to 232 -1);
SMB73
SMB72 is most significant byte, and SMB75 is least significant byte.
SMB74
SMB75
SM76.0 to
SM76.3
Reserved
SM76.4
PTO1 profile aborted;
0 = no error, 1 = aborted because of delta calculation error
SM76.5
PTO1 profile aborted;
0 = not aborted by user command, 1 = aborted by user command
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C-11
Special Memory (SM) Bits
Table C-15 Special Memory Bytes SMB66 to SMB85
SM Byte
Description
SM76.6
PTO1 pipeline overflow (cleared by the system when using external profiles,
otherwise must be reset by the user); 0 = no overflow, 1 = pipeline overflow
SM76.7
PTO1 idle bit: 0 = PTO in progress, 1 = PTO idle
SM77.0
PTO1/PWM1 update the cycle time value: 1 = write new cycle time
SM77.1
PWM1 update the pulse width value: 1 = write new pulse width
SM77.2
PTO1 update the pulse count value: 1 = write new pulse count
SM77.3
PTO1/PWM1 time base: 0 = 1 µs/tick, 1 = 1 ms/tick
SM77.4
Update PWM1 synchronously:
0 = asynchronous update, 1 = synchronous update
SM77.5
PTO1 operation: 0 = single segment operation (cycle time and pulse count
stored in SM memory), 1 = multiple segment operation (profile table stored in
V memory)
SM77.6
PTO1/PWM1 mode select: 0 = PTO, 1 = PWM
SM77.7
PTO1/PWM1 enable bit: 1 = enable
SMB78
PTO1/PWM1 cycle time value (2 to 65,535 units of the time base);
SMB79
SMB78 is most significant byte, and SMB79 is least significant byte.
SMB80
PWM1 pulse width value (0 to 65,535 units of the time base);
SMB81
SMB80 is most significant byte, and SMB81 is least significant byte.
SMB82
PTO1 pulse count value (1 to 232 -1);
SMB83
SMB82 is most significant byte, and SMB85 is least significant byte.
SMB84
SMB85
SMB86 to SMB94, and SMB186 to SMB194: Receive Message Control
As described in Table C-16, SMB86 through SMB94 and SMB186 through
SMB194 are used to control and read the status of the Receive Message
instruction.
Table C-16 Special Memory Bytes SMB86 to SMB94, and SMB186 to SMB194
Port 0
Port 1
SMB86
SMB186
Description
MSB
7
n
LSB
0
r
e
0
0
t
c
p
Receive Message status byte
n: 1 = Receive message terminated by user disable command
r:
1 = Receive message terminated: error in input parameters or
missing start or end condition
e: 1 = End character received
t:
1 = Receive message terminated: timer expired
c: 1 = Receive message terminated: maximum character count achieved
p
C-12
1 = Receive message terminated because of a parity error
S7-200 Programmable Controller System Manual
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Special Memory (SM) Bits
Table C-16 Special Memory Bytes SMB86 to SMB94, and SMB186 to SMB194
Port 0
Port 1
SMB87
SMB187
Description
MSB
7
n
LSB
0
x
y
z m
t
bk 0
Receive Message control byte
n: 0 = Receive Message function is disabled.
1 = Receive Message function is enabled.
The enable/disable receive message bit is checked each time the
RCV instruction is executed.
x: 0 = Ignore SMB88 or SMB188.
1 = Use the value of SMB88 or SMB188 to detect start of
message.
y: 0 = Ignore SMB89 or SMB189.
1 = Use the value of SMB89 or SMB189 to detect end of
message.
z: 0 = Ignore SMW90 or SMB190.
1 = Use the value of SMW90 to detect an idle line condition.
m: 0 = Timer is an inter-character timer.
1 = Timer is a message timer.
t:
0 = Ignore SMW92 or SMW192.
1 = Terminate receive if the time period in SMW92 or SMW192
is exceeded.
bk: 0 = Ignore break conditions
1 = Use break condition as start of message detection
The bits of the message interrupt control byte are used to define the
criteria by which the message is identified. Both start of message and
end of message criteria are defined. To determine the start of a
message, either of two sets of logically ANDed start of message
criteria must be true and must occur in sequence (idle line followed
by start character, or break followed by start character). To determine
the end of a message, the enabled end of the message criteria is
logically ORed. The equations for start and stop criteria are given
below:
Start of Message = il * sc + bk * sc
End of Message = ec + tmr + maximum character count
reached
Programming the start of message criteria for:
1. Idle line detection:
il=1, sc=0, bk=0, SMW90>0
2. Start character detection:
il=0, sc=1, bk=0, SMW90
is a don’t care
3. Break Detection:
il=0, sc=0, bk=1, SMW90
is a don’t care
4. Any response to a request:
il=1, sc=0, bk=0, SMW90=0
(Message timer can be used to terminate receive if there is no
response.)
5. Break and a start character:
il=0, sc=1, bk=1, SMW90
is a don’t care
6. Idle line and a start character:
il=1, sc=1, bk=0, SMW90 >0
7. Idle line and start character (Illegal): il=1, sc=1, bk=0, SMW90=0
Note: Receive will automatically be terminated by an overrun or a
parity error (if enabled).
SMB88
SMB188 Start of message character
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C-13
Special Memory (SM) Bits
Table C-16 Special Memory Bytes SMB86 to SMB94, and SMB186 to SMB194
Port 0
Port 1
Description
SMB89
SMB189 End of message character
SMB90
SMB91
SMB190 Idle line time period given in milliseconds. The first character received
SMB191 after idle line time has expired is the start of a new message. SM90
(or SM190) is the most significant byte and SM91 (or SM191) is the
least significant byte.
SMB92
SMB93
SMB192 Inter-character/message timer time-out value (in milliseconds). If the
SMB193 time period is exceeded, the receive message is terminated.
SM92 (or SM192) is the most significant byte, and SM93 (or SM193)
is the least significant byte.
SMB94
SMB194 Maximum number of characters to be received (1 to 255 bytes).
Note: This range must be set to the expected maximum buffer size,
even if the character count message termination is not used.
SMB98 and SMB99
As described in Table C-17, SMB98 and SMB99 give you information about the
number of errors on the expansion I/O bus.
Table C-17 Special Memory Bytes SMB98 and SMB99
SM Byte
SMB98
SMB99
C-14
Description
This location is incremented each time a parity error is detected on the
expansion I/O bus. It is cleared upon power up, and by the user writing zero.
SMB98 is the most significant byte.
S7-200 Programmable Controller System Manual
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Special Memory (SM) Bits
SMB131 to SMB165: HSC3, HSC4, and HSC5 Register
As described in Table C-18, SMB131 through SMB165 are used to monitor and
control the operation of high-speed counters HSC3, HSC4, and HSC5.
Table C-18 Special Memory Bytes SMB130 to SMB165
Description
SM Byte
SMB131 to
SMB135
Reserved
SM136.0 to
SM136.4
Reserved
SM136.5
HSC3 current counting direction status bit: 1 = counting up
SM136.6
HSC current value equals preset value status bit: 1 = equal
SM136.7
HSC3 current value is greater than preset value status bit: 1 = greater than
SM137.0 to
SM137.2
Reserved
SM137.3
HSC3 direction control bit: 1 = count up
SM137.4
HSC3 update direction: 1 = update direction
SM137.5
HSC3 update preset value: 1 = write new preset value to HSC3 preset
SM137.6
HSC3 enable bit: 1 = enable
SM138 to
SM141
HSC3 new current value: SM138 is most significant byte and SM141 is
least significant byte
SM142 to
SM145
HSC3 new preset value: SM142 is most significant byte and SM145 is the
least significant byte
SM146.0 to
SM146.4
Reserved
SM146.5
HSC4 current counting direction status bit: 1 = counting up
SM146.7
HSC4 current value is greater than preset value status bit: 1 = greater than
SM147.0
Active level control bit for Reset:
0 = Reset is active high, 1 = Reset is active low
SM147.1
Reserved
SM147.2
Counting rate selection for quadrature counters:
0 = 4x counting rate, 1 = 1x counting rate
SM147.3
HSC4 direction control bit: 1 = count up
SM147.4
HSC4 update direction: 1 = update direction
SM147.5
HSC4 update preset value: 1 = write new preset value to HSC4 preset
SM147.6
HSC4 update current value: 1 = write new current value to HSC4 current
SM147.7
HSC4 enable bit: 1 = enable
SMB148 to
SMB151
HSC4 new current value: SM148 is most significant byte and SM151 is
least significant byte
SMB152 to
SMB155
HSC4 new preset value: SM152 is most significant byte and SM155 is least
significant byte
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C-15
Special Memory (SM) Bits
Table C-18 Special Memory Bytes SMB130 to SMB165
SM Byte
Description
SM156.0 to
SM156.4
Reserved
SM156.5
HSC5 current counting direction status bit: 1 = counting up
SM156.6
HSC5 current value equals preset value status bit: 1 = equal
SM156.7
HSC5 current value is greater than preset value status bit: 1 = greater than
SM157.0 to
SM157.2
Reserved
SM157.3
HSC5 direction control bit: 1 = count up
SM157.4
HSC5 update direction: 1 = update direction
SM157.5
HSC5 update preset value: 1 = write new preset value to HSC5 preset
SM157.6
HSC5 update current value: 1 = write new current value to HSC5 current
SM157.7
HSC5 enable bit: 1 = enable
SMB158 to
SMB161
HSC5 new current value: SM158 is most significant byte and SM161 is
least significant byte
SMB162 to
SMB165
HSC5 new preset value: SM162 is most significant byte and SM165 is least
significant byte
SMB166 to SMB194: PTO0, PT1 Profile Definition Table
As described in Table C-19, SMB166 through SMB194 are used to show the
number of active profile steps and the address of the profile table in V memory.
Table C-19 Special Memory Bytes SMB166 to SMB194
Description
SM Byte
C-16
SMB166
Current entry number of the active profile step for PTO0
SMB167
Reserved
SMB168
SMB169
V memory address of the profile table for PTO0 given as an offset from V0.
SM168 is the most significant byte of the address offset
SMB170 to
SMB175
Reserved
SMB176
Current entry number of the active profile step for PTO1
SMB177
Reserved
SMB178 to
SMB179
V memory address of the profile table for PTO1 given as an offset from V0.
SM178 is the most significant byte of the address offset
SMB180 to
SMB194
Reserved
S7-200 Programmable Controller System Manual
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D
S7-200 Troubleshooting Guide
Table D-1
S7-200 Troubleshooting Guide
Possible Causes
Problem
Outputs stop
working.
CPU SF
(System Fault)
light comes on.
Solution
The device being controlled
has caused an electrical surge
that damaged the output.
When connecting to an inductive load (such
as a motor or relay), a proper suppression
circuit should be used. Refer to Section 2.4.
User program error
Correct user program
Wiring loose or incorrect
Check wiring and correct
Excessive load
Check load against point ratings
Output forced points
Check CPU for forced I/O
The following list describes the
most common causes:
User programming error
–
0003 Watchdog error
–
0011 Indirect addressing
–
0012 Illegal floating point
value
Read the fatal error code number and refer to
Section B.1:
For a programming error, check the usage of
the FOR, NEXT, JMP, LBL, and Compare
instructions.
For electrical noise:
–
Refer to the wiring guidelines in
Section 2.3. It is very important that the
control panel is connected to a good
ground and that high voltage wiring is not
run in parallel with low voltage wiring.
–
Connect the M terminal on the 24 VDC
Sensor Power Supply to ground.
Electrical noise
–
0001 through 0009
Component damage
–
Power supply
damaged.
0001 through 0010
Over-voltage on the power lines
coming to the unit.
Connect a line analyzer to the system to check
the magnitude and duration of the over-voltage
spikes. Based on this information, add the proper
type arrestor device to your system.
Refer to the wiring guidelines in Section 2.3 for
information about installing the field wiring.
Electrical noise
problems
Improper grounding
Routing on wiring within the
control cabinet.
Input filters are configured for a
speed that is too fast
Refer to the wiring guidelines in Section 2.3. It is
very important that the control panel is connected
to a good ground and that high voltage wiring is
not run in parallel with low voltage wiring.
Connect the M terminal on the 24 VDC Sensor
Power Supply to ground.
Increase the input filter delay in the system data
block. Refer to Section 5.2.
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
D-1
S7-200 Troubleshooting Guide
Table D-1
S7-200 Troubleshooting Guide
Problem
Possible Causes
Solution
Communication
network is
damaged when
connecting to
an external
device.
The communication cable can
provide a path for unwanted
currents if all non-isolated devices
(such as PLCs, computers or other
devices) that are connected to the
network do not share the same
circuit common reference. The
unwanted currents can cause
communication errors or damage
to the circuits.
Refer to the wiring guidelines in Section 2.3,
and to the network guidelines in Chapter 7.
(Either the port
on the
computer, the
port on the
PLC, or the
PC/PPI cable is
damaged.)
Purchase the isolated PC/PPI cable.
Purchase the isolated RS-485-to-RS-485
repeater when you connect machines that do
not have a common electrical reference.
STEP 7-Micro/WIN 32 Communication problems
Refer to Chapter 7 for information about network
communications.
Error Handling
Refer to Appendix B for information about error
codes.
D-2
S7-200 Programmable Controller System Manual
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S7-200 Order Numbers
CPUs
E
Order Number
CPU 221 DC/DC/DC 6 Inputs/4 Outputs
6ES7 211-0AA20-0XB0
CPU 221 AC/DC/Relay 6 Inputs/4 Outputs
6ES7 211-0BA20-0XB0
CPU 222 DC/DC/DC 8 Inputs/6 Outputs
6ES7 212-1AB20-0XB0
CPU 222 AC/DC/Relay 8 Inputs/6 Outputs
6ES7 212-1BB20-0XB0
CPU 224 DC/DC/DC 14 Inputs/10 Outputs
6ES7 214-1AD20-0XB0
CPU 224 AC/DC/Relay 14 Inputs/10 Outputs
6ES7 214-1BD20-0XB0
Expansion Modules
Order Number
EM221 24 VDC Digital 8 Inputs
6ES7 221-1BF20-0XA0
EM222 24 VDC Digital 8 Outputs
6ES7 222-1BF20-0XA0
EM222 Relay 8 Outputs
6ES7 222-1HF20-0XA0
EM223 24 VDC Digital Combination 8 Inputs/8 Outputs
6ES7 223-1BH20-0XA0
EM223 24 VDC Digital Combination 8 Inputs/8 Relay Outputs
6ES7 223-1PH20-0XA0
Cartridges and Cables
Order Number
MC 291, CPU 22x Memory Cartridge
6ES7 291-8GE20-0XA0
CC 292, CPU 22x Clock/Calendar with Battery Cartridge
6ES7 297-1AA20-0XA0
BC 293, CPU 22x Battery Cartridge
6ES7 291-8BA20-0XA0
Cable, I/O Expansion, .8 meters, CPU 22x/EM
6ES7 290-6AA20-0XA0
Cable, PC/PPI, Isolated, 5-switch
6ES7 901-3BF20-0XA0
Programming Software
Order Number
STEP 7-Micro/WIN 32 (V3.0) Individual License (diskette)
6ES7 810-2BA00-0YX0
STEP 7-Micro/WIN 32 (V3.0) Upgrade License (diskette)
6ES7 810-2BA00-0YX3
STEP 7-Micro/WIN 32 (V3.0) Individual License (CD-ROM)
6ES7 810-2BC00-0YX0
STEP 7-Micro/WIN 32 (V3.0) Upgrade License (CD-ROM)
6ES7 810-2BC00-0YX3
Communications Cards
Order Number
MPI Card: Short AT ISA
6ES7 793-2AA01-0AA0
CP 5411: Short AT ISA
6GK1 541-1AA00
CP 5511: PCMCIA, Type II
6GK1 551-1AA00
CP 5611: PCI card (version 3.0 or greater)
6GK1 561-1AA00
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
E-1
S7-200 Order Numbers
Manuals
Order Number
TD 200 Operator Interface User Manual
6ES7 272-0AA00-8BA0
S7-200 Point-to-Point Interface Communication Manual (English/German)
6ES7 298-8GA00-8XH0
S7-200 Programmable Controller System Manual (German)
6ES7 298-8FA20-8AH0
S7-200 Programmable Controller System Manual (English)
6ES7 298-8FA20-8BH0
S7-200 Programmable Controller System Manual (French)
6ES7 298-8FA20-8CH0
S7-200 Programmable Controller System Manual (Spanish)
6ES7 298-8FA20-8DH0
S7-200 Programmable Controller System Manual (Italian)
6ES7 298-8FA20-8EH0
Cables, Network Connectors, and Repeaters
Order Number
MPI Cable
6ES7 901-0BF00-0AA0
PROFIBUS Network Cable
6XVI 830-0AH10
Network Bus Connector with Programming Port Connector, Vertical Cable
Outlet
6ES7 972-0BB11-0XA0
Network Bus Connector (No Programming Port Connector), Vertical Cable
Outlet
6ES7 972-0BA11-0XA0
CPU 22x/EM Connector Block, 7 Terminal, Removeable
6ES7 292-1AD20-0AA0
CPU 22x/EM Connector Block, 12 Terminal Removeable
6ES7 292-1AE20-0AA0
CPU 22x/EM Connector Block 18 Terminal, Removeable
6ES7 292-1AG20-0AA0
RS-485 Bus Connector with 35° Cable Outlet
6ES7 972-0BA40-0XA0
RS-485 IP 20 Repeater, Isolated
6ES7 972-0AA00-0XA0
Operator Interfaces
Order Number
TD 200 Operator Interface
6ES7 272-0AA00-0YA0
OP3 Operator Interface
6AV3 503-1DB10
OP7 Operator Interface
6AV3 607-1JC20-0AX1
OP17 Operator Interface
6AV3 617-1JC20-0AX1
Miscellaneous
Order Number
DIN Rail Stops
12-Position Fan Out Connector (CPU 221, CPU 222)
6ES5 728-8MAll
10-pack
Spare Door Kit, contains 4 each of the following: CPU 221/222 EM22x 12
Terminal Block Cover, CPU 224 18 Terminal Block Cover, EM 22x 7 Terminal
Block Cover, CPU Access Door, EM Access door
E-2
6ES7 290-2AA00-0XA0
6ES7 291-3AX20-0XA0
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
F
Execution Times for STL Instructions
Effect of Power Flow on Execution Times
The calculation of the basic execution time for an STL instruction (Table F-4)
shows the time required for executing the logic, or function, of the instruction when
power flow is present (where the top-of-stack value is ON or 1). For some
instructions, the execution of that function is conditional upon the presence of
power flow: the CPU performs the function only when power flow is present to the
instruction (when the top-of-stack value is ON or 1). If power flow is not present to
the instruction (the top-of-stack value is OFF or 0), use a “no powerflow” execution
time to calculate the execution time of that instruction. Table F-1 provides the
execution time of an STL instruction with no power flow (when the top-of-stack
value is OFF or 0) for each S7-200 CPU module.
Table F-1
Execution Time for Instructions with No Power Flow
S7-200 CPU
Instruction with No Power Flow
All STL instructions
3 µs
Effect of Indirect Addressing on Execution Times
The calculation of the basic execution time for an STL instruction (Table F-4)
shows the time required for executing the instruction, using direct addressing of the
operands or constants. If your program uses indirect addressing, increase the
execution time for each indirectly addressed operand by the figure shown in
Table F-2.
Table F-2
Additional Time to Add for Indirect Addressing
S7-200 CPU
Instruction for Indirect Addressing
Each indirectly addressed operand
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
22 µs
F-1
Execution Times for STL Instructions
Execution Times
Accessing certain memory areas, such as AI, AQ, L, and accumulators, require
additional execution time. Table F-3 provides a factor to be added to the basic
execution time for each operand access of these memory areas.
Table F-3
Execution Time Adder for Accesses to Selected Memory Areas
Memory Area
S7-200 CPU
Analog Inputs (AI)
149 µs
Analog Outputs (AQ)
73 µs
Local memory (L)
5.4 µs
Accumulators (AC)
4.4 µs
Basic Execution Times for STL Instructions
Table F-4 lists the basic execution times of the STL instructions for each of the
S7-200 CPU modules.
Table F-4
Execution Times for the STL Instructions (in µs)
Instruction
S7-200 CPU
(in µs)
Description
=
Basic execution time:
+D
Basic execution time
55
-D
Basic execution time
55
*D
Basic execution time
92
/D
Basic execution time
376
+I
Basic execution time
46
-I
Basic execution time
47
*I
Basic execution time
71
/I
Basic execution time
115
=I
Basic execution time:
+R
Basic execution time
Maximum execution time
110
163
-R
Basic execution time
Maximum execution time
113
166
*R
Basic execution time
Maximum execution time
100
130
/R
Basic execution time
Maximum execution time
300
360
F-2
I
L
SM, T, C, V, S, Q, M
local output
expansion output
0.37
19.2
1.8
29
39
S7-200 Programmable Controller System Manual
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Execution Times for STL Instructions
Table F-4
Execution Times for the STL Instructions (in µs)
Instruction
Description
A
Basic execution time:
AB < =, =, >=, >, <, <>
Basic execution time
35
AD < =, =, >=, >, <, <>
Basic execution time
53
AI
Basic execution time:
ALD
Basic execution time
AN
Basic execution time:
ANDB
Basic execution time
37
ANDD
Basic execution time
55
ANDW
Basic execution time
48
ANI
Basic execution time:
AR <=, =, >=, >, <, <>
Basic execution time
54
ATCH
Basic execution time
20
ATH
Total = Basic time + (Length)< (Length multiplier)
Basic execution time (constant length)
Basic execution time (variable length)
Length multiplier (LM)
177
186
23
ATT
Basic execution time
125
AW < =, =, >=, >, <, <>
Basic execution time
45
BCDI
Basic execution time
66
BMB
Total = Basic time + (Length)< (LM)
Basic execution time (constant length)
Basic execution time (variable length)
Length multiplier (LM)
172
181
11
Total = Basic time + (Length)<(LM)
Basic execution time (constant length)
Basic execution time (variable length)
Length multiplier (LM)
173
183
20
Total = Basic time + (Length)< (LM)
Basic execution time (constant length)
Basic execution time (variable length)
Length multiplier (LM)
172
181
16
BMD
BMW
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
I
L
SM, T, C, V, S, Q, M
S7-200 CPU
(in µs)
local input
expansion input
0.37
10.8
1.1
27
35
0.37
I
L
SM, T, C, V, S, Q, M
local input
expansion input
0.37
10.8
1.1
27
35
F-3
Execution Times for STL Instructions
Table F-4
Execution Times for the STL Instructions (in µs)
Instruction
CALL
CRET
S7-200 CPU
(in µs)
Description
With no parameters:
Execution time
With parameters:
Total execution time =
Basic time + Σ (input operand handling time)
Basic execution time
Input operand handling time (bit operand)
Input operand handling time (byte operand)
Input operand handling time (word operand)
Input operand handling time (Dword operand)
15
32
23
21
24
27
Total execution time =
Basic time + Σ (output operand handling time)
Basic execution time
Output operand handling time (bit operand)
Output operand handling time (byte operand)
Output operand handing time (word operand)
Output operand handling time (Dword operand)
13
21
14
18
20
CRETI
Basic execution time
23
CTD
Basic execution time on transition of count input
Basic execution time otherwise
48
36
CTU
Basic execution time on transition of count input
Basic execution time otherwise
53
35
CTUD
Basic execution time on transition of count input
Basic execution time otherwise
64
45
DECB
Basic execution time
30
DECD
Basic execution time
42
DECO
Basic execution time
36
DECW
Basic execution time
37
DISI
Basic execution time
18
DIV
Basic execution time
119
DTCH
Basic execution time
18
DTR
Basic execution time
Maximum execution time
60
70
ED
Basic execution time
15
ENCO
Minimum execution time
Maximum execution time
39
43
END
Basic execution time
0.9
ENI
Basic execution time
53
EU
Basic execution time
15
FIFO
Total = Basic time + (LM)<(Length)
Basic execution time
Length multiplier (LM)
109
14
F-4
S7-200 Programmable Controller System Manual
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Execution Times for STL Instructions
Table F-4
Execution Times for the STL Instructions (in µs)
Instruction
Description
S7-200 CPU
(in µs)
Total = Basic time + (LM) < (Length)
Basic execution time (constant length)
Basic execution time (variable length)
Length multiplier (LM)
156
165
7
Total = Basic time + (LM) < (Length)
Basic execution time
Length multiplier (LM)
224
12
Total = Basic time + (LM) < (Number of repetitions)
Basic execution time
Loop multiplier (LM)
73
72
HDEF
Basic execution time
35
HSC
Basic execution time
37
HTA
Total = Basic time + (LM) < (Length)
Basic execution time (constant length)
Basic execution time (variable length)
Length multiplier (LM)
175
184
11
IBCD
Basic execution time
114
INCB
Basic execution time
29
INCD
Basic execution time
42
INCW
Basic execution time
37
INT
Typical execution time with 1 interrupt
47
INVB
Basic execution time
31
INVD
Basic execution time
42
INVW
Basic execution time
38
JMP
Basic execution time
0.9
LBL
Basic execution time
0.37
LD
Basic execution time:
LDB <=, =, >=, >, <, <>
Basic execution time
35
LDD <=, =, >=, >, <, <>
Basic execution time
52
LDI
Basic execution time:
Local input
Expansion input
26
34
LDN
Basic execution time:
I
L
SM, T, C, V, S, Q, M
0.37
10.9
1.1
LDNI
Basic execution time:
Local input
Expansion input
26
34
LDR<=, =, >=, >, <, <>
Basic execution time
55
LDS
Basic execution time
0.37
FILL
FND <, =, >, <>
FOR
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
I
L
SM, T, C, V, S, Q, M
SM0.0
0.37
10.9
1.1
0.37
F-5
Execution Times for STL Instructions
Table F-4
Execution Times for the STL Instructions (in µs)
Instruction
S7-200 CPU
(in µs)
Description
LDW <=, =, >=, >, <, <> Basic execution time
42
LIFO
Basic execution time
121
LPP
Basic execution time
0.37
LPS
Basic execution time
0.37
LRD
Basic execution time
0.37
LSCR
Basic execution time
12
MEND
Basic execution time
0.5
MOVB
Basic execution time
29
MOVD
Basic execution time
38
MOVR
Basic execution time
38
MOVW
Basic execution time
34
MUL
Basic execution time
70
NEXT
Basic execution time
0
NETR
Basic execution time
286
NETW
Total = Basic time + (LM)<(Length)
Basic execution time
Length multiplier (LM)
274
8
NOP
Basic execution time
0.37
NOT
Basic execution time
0.37
O
Basic execution time:
OB < =, =, >=, >, <, <>
Basic execution time
35
OD < =, =, >=, >, <, <>
Basic execution time
53
OI
Basic execution time:
OLD
Basic execution time
ON
Basic execution time:
I
L
SM, T, C, V, S, Q, M
0.37
10.8
1.1
ONI
Basic execution time:
Local input
Expansion input
27
35
OR<=, =, >=, >, <, <>
Basic execution time
55
ORB
Basic execution time
37
ORD
Basic execution time
55
ORW
Basic execution time
48
OW < =, =, >=, >, <, <>
Basic execution time
45
F-6
I
L
SM, T, C, V, S, Q, M
Local input
Expansion input
0.37
10.8
1.1
27
35
0.37
S7-200 Programmable Controller System Manual
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Execution Times for STL Instructions
Table F-4
Execution Times for the STL Instructions (in µs)
Instruction
PID
PLS
R
Description
S7-200 CPU
(in µs)
Basic execution time
750
Adder to recalculate (Kc<Ts/Ti) and (Kc<Td/Ts) prior to the
PID calculation. Recalculation occurs if the value of Kc, Ts, Ti,
or Ts has changed from the previous execution of this
instruction, or on a transition to auto control.
1000
Basic execution time:
PWM
PTO single segment
PTO multiple segment
57
67
92
For length=1 and specified as a constant (e.g. R V0.2,1)
Execution time for operand = C
Execution time for operand = T
Execution time for all other operands
17
24
5
Otherwise,
Total execution time=Basic execution time +(LM)*(Length)
Basic execution time for operand = C, T
Basic execution time for all other operands
Length multiplier (LM) for operand = C
Length multiplier (LM) for operand = T
Length multiplier (LM) for all other operands
19
28
8.6
16.5
0.9
If the length is stored in a variable instead of being
specified as a constant, increase the basic execution time
by adding:
29
RCV
Basic execution time
104
RET
Total execution time =
Basic time + Σ (output operand handling time)
Basic execution time
Output operand handling time (bit operand)
Output operand handling time (byte operand)
Output operand handing time (word operand)
Output operand handling time (Dword operand)
13
21
14
18
20
RETI
Basic execution time
23
RI
Total = Basic time + (LM)<(Length)
Basic execution time
Length multiplier (local output)
Length multiplier (expansion output)
18
22
32
If the length is stored in a variable instead of being a
constant, increase the basic execution time by adding:
RLB
RLD
RLW
30
Total = Basic time + (LM)<(Length)
Basic execution time
Length multiplier (LM)
42
0.6
Total = Basic time + (LM)<(Length)
Basic execution time
Length multiplier (LM)
52
2.5
Total = Basic time + (LM)<(Length)
Basic execution time
Length multiplier (LM)
49
1.7
S7-200 Programmable Controller System Manual
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F-7
Execution Times for STL Instructions
Table F-4
Execution Times for the STL Instructions (in µs)
Instruction
RRB
RRD
RRW
S
S7-200 CPU
(in µs)
Description
Total = Basic time + (LM)<(Length)
Basic execution time
Length multiplier (LM)
42
0.6
Total = Basic time + (LM)<(Length)
Basic execution time
Length multiplier (LM)
52
2.5
Total = Basic time + (LM)<(Length)
Basic execution time
Length multiplier (LM)
49
1.7
For length = 1 and specified as a constant (e.g., S V0.2, 1)
Execution time
5
Otherwise,
Total execution time=Basic execution time +(LM)*(Length)
27
Basic execution time for all other operands
0.9
Length multiplier (LM) for all other operands
If the length is stored in a variable instead of being a
constant, increase the basic execution time by adding:
29
SBR
Basic execution time
0
SCRE
Basic execution time
0.37
SCRT
Basic execution time
17
SEG
Basic execution time
30
SHRB
Total = Basic time + (LM)<(Length)
Basic execution time
Length multiplier (LM)
140
1.6
Total = Basic time + (LM)<(Length)
Basic execution time
Length multiplier (LM) (local output)
Length multiplier (LM) (expansion output)
18
22
32
SI
If the length is stored in a variable instead of being a
constant, increase the basic execution time by adding:
SLB
30
Total = Basic time + (LM)<(Length)
Basic execution time
Length multiplier (LM)
43
0.7
Total = Basic time + (LM)<(Length)
Basic execution time
Length multiplier (LM)
53
2.6
Total = Basic time + (LM)<(Length)
Basic execution time
Length multiplier (LM)
51
1.3
SQRT
Basic execution time
Maximum execution time
725
830
SRB
Total = Basic time + (LM)<(Length)
Basic execution time
Length multiplier (LM)
43
0.7
SLD
SLW
F-8
S7-200 Programmable Controller System Manual
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Execution Times for STL Instructions
Table F-4
Execution Times for the STL Instructions (in µs)
Instruction
SRD
Description
S7-200 CPU
(in µs)
Total = Basic time + (LM)<(Length)
Basic execution time
Length multiplier (LM)
53
2.6
Total = Basic time + (LM)<(Length)
Basic execution time
Length multiplier (LM)
51
1.3
STOP
Basic execution time
16
SWAP
Basic execution time
32
TODR
Basic execution time
2400
TODW
Basic execution time
1600
TOF
Basic execution time
64
TON
Basic execution time
64
TONR
Basic execution time
56
TRUNC
Basic execution time
Maximum execution time
103
178
WDR
Basic execution time
16
XMT
Basic execution time
113
XORB
Basic execution time
37
XORD
Basic execution time
55
XORW
Basic execution time
48
SRW
S7-200 Programmable Controller System Manual
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F-9
Execution Times for STL Instructions
F-10
S7-200 Programmable Controller System Manual
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S7-200 Quick Reference Information
G
This appendix contains information about the following:
Special Memory Bits
Descriptions of Interrupt Events
Summary of S7-200 CPU Memory Ranges and Features
HIgh-Speed Counters HSC0, HSC1, HSC2, HSC3, HSC4, HSC5
S7-200 Instructions
Table G-1
Special Memory Bits
Special Memory Bits
SM0.0
Always On
SM1.0
Result of operation = 0
SM0.1
First Scan
SM1.1
Overflow or illegal value
SM0.2
Retentive data lost
SM1.2
Negative result
SM0.3
Power up
SM1.3
Division by 0
SM0.4
30 s off / 30 s on
SM1.4
Table full
SM0.5
0.5 s off / 0.5 s on
SM1.5
Table empty
SM0.6
Off 1 scan / on 1 scan
SM1.6
BCD to binary conversion error
SM0.7
Switch in RUN position
SM1.7
ASCII to hex conversion error
S7-200 Programmable Controller System Manual
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G-1
S7-200 Quick Reference Information
Table G-2
Descriptions of Interrupt Events
Event
Number
G-2
Interrupt Description
Priority Group
Priority
in Group
8
Port 0: Receive character
0
9
Port 0: Transmit complete
0
23
Port 0: Receive message complete
24
Port 1: Receive message complete
25
Port 1: Receive character
1
26
Port 1: Transmit complete
1
0
Rising edge, I0.0
2
Rising edge, I0.1
1
4
Rising edge, I0.2
2
6
Rising edge, I0.3
3
1
Falling edge, I0.0
4
3
Falling edge, I0.1
5
5
Falling edge, I0.2
6
7
Falling edge, I0.3
7
12
HSC0 CV=PV (current value = preset value)
0
27
HSC0 direction changed
16
28
HSC0 external reset/Z phase
2
13
HSC1 CV=PV (current value = preset value)
8
14
HSC1 direction input changed
9
15
HSC1 external reset
10
16
HSC2 CV=PV (current value = preset value)
11
17
HSC2 direction changed
12
18
HSC2 external reset
13
32
HSC3 CV=PV
1
29
HSC4 CV=PV
3
30
HSC4 direction changed
17
31
HSC4 external reset/Z phase
18
33
HSC5 CV=PV
19
19
PTO 0 complete interrupt
14
20
PTO 1 complete interrupt
15
10
Timed interrupt 0
11
Timed interrupt 1
1
21
Timer T32 CT=PT interrupt
2
22
Timer T96 CT=PT interrupt
3
Communications
(hi h t)
(highest)
Discrete (middle)
Timed (lowest)
0
1
0
0
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
S7-200 Quick Reference Information
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Table G-3
Summary of S7-200 CPU Memory Ranges and Features
Range Limit
Description
CPU 221
CPU 222
Accessible as ...
CPU 224
Bit
Byte
Word
Double
Word
User program size
2 Kwords
2 Kwords
4 Kwords
User data size
1 Kwords
1 Kwords
2.5 Kwords
Process-image input
register
I0.0 to I15.7
I0.0 to I15.7
I0.0 to I15.7
Ix.y
IBx
IWx
IDx
Process-image output
register
Q0.0 to Q15.7
Q0.0 to Q15.7
Q0.0 to Q15.7
Qx.y
QBx
QWx
QDx
Analog inputs
(read only)
--
AIW0 to AIW30
AIW0 to AIW30
AIWx
Analog outputs (write
only)
--
AQW0 to
AQW30
AQW0 to
AQW30
AQWx
Variable memory (V)1
VB0.0 to
VB2047.7
VB0.0 to
VB2047.7
VB0.0 to
VB5119.7
Vx.y
VBx
VWx
VDx
Local memory (L)2
LB0.0 to LB63.7
LB0.0 to LB63.7
LB0.0 to LB63.7
Lx.y
LBx
LWx
LDx
Bit memory (M)
M0.0 to M31.7
M0.0 to M31.7
M0.0 to M31.7
Mx.y
MBx
MWx
MDx
Special Memory (SM)
SM0.0 to
SM179.7
SM0.0 to
SM179.7
SM0.0 to
SM179.7
SMx.y
SMBx
SMWx
SMDx
SM0.0 to
SM29.7
SM0.0 to
SM29.7
SM0.0 to
SM29.7
256 (T0 to T255)
256 (T0 to T255)
256 (T0 to T255)
T0, T64
T0, T64
T0, T64
Read only
Timers
Ret. on-delay
1 ms
Ret. on-delay
10 ms
T1 to T4,
T65 to T68
T1 to T4,
T65 to T68
T1 to T4,
T65 to T68
Ret. on-delay 100 ms
T5 to T31,
T69 to T95
T5 to T31,
T69 to T95
T5 to T31,
T69 to T95
On/Off delay
1 ms
T32, T96
T32, T96
T32, T96
On/Off delay
10 ms
T33 to T36,
T97 to T100
T33 to T36,
T97 to T100
T33 to T36,
T97 to T100
On/Off delay
100 ms
T37 to T63,
T101 to T255
T37 to T63,
T101 to T255
T37 to T63,
T101 to T255
Counters
C0 to C255
C0 to C255
C0 to C255
High-speed counter
HC0, HC3. HC4,
HC5
HC0, HC3, HC4,
HC5
HC0 to HC5
Sequential control
relays (S)
S0.0 to S31.7
S0.0 to S31.7
S0.0 to S31.7
Accumulator registers
AC0 to AC3
AC0 to AC3
AC0 to AC3
Jumps/Labels
0 to 255
0 to 255
0 to 255
Call/Subroutine
0 to 63
0 to 63
0 to 63
Interrupt routines
0 to 127
0 to 127
0 to 127
PID loops
0 to 7
0 to 7
0 to 7
Port
Port 0
Port 0
Port 0
Tx
Tx
Cx
Cx
HCx
Sx.y
SBx
SWx
SDx
ACx
ACx
ACx
1 All V memory can be saved to permanent memory.
2 LB60 to LB63 are reserved by STEP 7-Micro/WIN 32, version 3.0 or later.
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
G-3
S7-200 Quick Reference Information
Table G-4
High-Speed Counters HSC0, HSC3, HSC4, and HSC5
HSC0
Mode
HSC3
HSC4
I0.0
I0.1
I0.2
I0.1
I0.3
I0.4
I0.5
I0.4
0
Clk
-
-
Clk
Clk
-
-
Clk
1
Clk
-
Reset
-
Clk
-
Reset
-
2
-
-
-
-
-
-
-
-
3
Clk
Direction
-
-
Clk
Direction
-
-
4
Clk
Direction
Reset
-
Clk
Direction
Reset
-
5
-
-
-
-
-
-
-
-
6
Clk Up
Clk Down
-
-
Clk Up
Clk Down
-
-
7
Clk Up
Clk Down
Reset
-
Clk Up
Clk Down
Reset
-
8
-
-
-
-
-
-
-
-
9
Phase A
Phase B
-
-
Phase A
Phase B
-
-
10
Phase A
Phase B
Reset
-
Phase A
Phase B
Reset
-
11
-
-
-
-
-
-
-
-
Table G-5
High-Speed Counters HSC1 and HSC2
HSC1
Mode
G-4
HSC5
HSC2
I0.6
I0.7
I1.0
I1.1
I1.2
I1.3
I1.4
I1.5
0
Clk
-
-
-
Clk
-
-
-
1
Clk
-
Reset
-
Clk
-
Reset
-
2
Clk
-
Reset
Start
Clk
-
Reset
Start
3
Clk
Direction
-
-
Clk
Direction
-
-
4
Clk
Direction
Reset
-
Clk
Direction
Reset
-
5
Clk
Direction
Reset
Start
Clk
Direction
Reset
Start
6
Clk Up
Clk Down
-
-
Clk Up
Clk Down
-
-
7
Clk Up
Clk Down
Reset
-
Clk Up
Clk Down
Reset
-
8
Clk Up
Clk Down
Reset
Start
Clk Up
Clk Down
Reset
Start
9
Phase A
Phase B
-
-
Phase A
Phase B
-
-
10
Phase A
Phase B
Reset
-
Phase A
Phase B
Reset
-
11
Phase A
Phase B
Reset
Start
Phase A
Phase B
Reset
Start
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
S7-200 Quick Reference Information
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Boolean Instructions
Math, Increment, and Decrement instructions
LD
N
Load
+I
IN1, OUT
LDI
N
Load Immediate
+D
IN1, OUT
LDN
N
Load Not
+R
IN1, OUT
LDNI
N
Load Not Immediate
-I
IN1, OUT
A
N
AND
-D
IN1, OUT
Subtract Integer, DWord, or
Real
AI
N
AND Immediate
-R
IN1, OUT
OUT-IN1=OUT
AN
N
AND Not
MUL
IN1, OUT
Multiply Integer or Real
ANI
N
AND Not Immediate
*R
IN1, OUT
IN1 * OUT = OUT
O
N
OR
*D, *I
IN1, OUT
OI
N
OR Immediate
Multiply Integer or Double
Integer
ON
N
OR Not
DIV
IN1, OUT
Divide Integer or Real
OR Not Immediate
/R
IN1, OUT
IN1 / OUT = OUT
LDBx N1, N2
Load result of Byte Compare
N1 (x:<, <=,=, >=, >, <>) N2
/D, /I
IN1, OUT
Divide Integer or Double Integer
ABx
N1, N2
AND result of Byte Compare
N1 (x:<, <=,=, >=, >, <>) N2
INCB
OBx
N1, N2
OR result of Byte Compare
N1 (x:<, <=,=, >=, >, <>) N2
INCD OUT
LDWx N1, N2
Load result of Word Compare
N1 (x:<, <=,=, >=, >, <>) N2
ONI
N
AWx
N1, N2
AND result of Word Compare
N1 (x:<, <=,=, >=, >, <>) N2
OWx
N1, N2
OR result of Word Compare
N1 (x:<, <=,=, >=, >, <>) N2
LDDx N1, N2
ADx
ODx
N1, N2
SQRT IN, OUT
Add Integer, DWord or Real
IN1+OUT=OUT
Square Root
OUT
INCW OUT
Increment Byte, Word or DWord
DECB OUT
Decrement Byte, Word, or
DWord
DECW OUT
DECD OUT
PID
Table, Loop
PID Loop
Timer and Counter Instructions
TON
Txxx, PT
On-Delay Timer
Load result of DWord Compare
N1 (x:<, <=,=, >=, >, <>) N2
TOF
Txxx, PT
Off-Delay Timer
AND result of DWord Compare
N1 (x:<, <=,=, >=, >, <>) N2
TONR Txxx, PT
Retentive On-Delay Timer
CTU
Cxxx, PV
Count Up
CTD
Cxxx, PV
Count Down
N1, N2
OR result of DWord Compare
N1 (x:<, <=,=, >=, >, <>) N2
LDRx N1, N2
Load result of Real Compare
N1 (x:<, <=,=, >=, >, <>) N2
ARx
AND result of Real Compare
N1 (x:<, <=,=, >=, >, <>) N2
TODW T
OR result of Real Compare
N1 (x:<, <=,=, >=, >, <>) N2
END
Conditional End of Program
STOP
Transition to STOP Mode
WDR
WatchDog Reset (300 ms)
ORx
N1, N2
N1, N2
NOT
Stack Negation
EU
Detection of Rising Edge
ED
Detection of Falling Edge
=
=I
N
N
Assign Value
Assign Value Immediate
S
S_BIT, N
Set bit Range
R
S_BIT, N
Reset bit Range
SI
S_BIT, N
Set bit Range Immediate
RI
S_BIT, N
Reset bit Range Immediate
CTUD Cxxx, PV
TODR T
Read Time of Day clock
Write Time of Day clock
Program Control Instructions
JMP
N
Jump to defined Label
LBL
N
Define a Label to Jump to
CALL N [N1,...]
Call a Subroutine [N1, ... up to
16 optional parameters]
CRET
Conditional Return from SBR
FOR
INDX,INIT,
FINAL
For/Next Loop
NEXT
LSCR N
SCRT N
SCRE
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Count Up/Down
Real Time Clock Instructions
Load, Transition, and End
Sequence Control Relay
Segment
G-5
S7-200 Quick Reference Information
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Move, Shift, Rotate, and Fill Instructions
Table, Find, and Conversion Instructions
MOVB IN, OUT
ATT
TABLE,DATA
MOVW IN, OUT
LIFO
TABLE,DATA
FIFO
TABLE,DATA
Move Byte, Word, DWord, Real
MOVD IN, OUT
MOVR IN, OUT
BMB
Block Move Byte, Word, DWord
FND<>SRC,PATRN,
INDX
SWAP IN
Swap Bytes
FND< SRC,PATRN,
INDX
SHRB DATA, S_BIT,
N
Shift Register Bit
FND> SRC,PATRN,
INDX
IN, OUT, N
SRB
OUT, N
SRW
OUT, N
SRD
Get data from table
FND= SRC,PATRN,
INDX
IN, OUT, N
BMW IN, OUT, N
BMD
Add data to table
Find data value in table that
matches comparison
BCDI
OUT
Convert BCD to Integer
IBCD
OUT
Convert Integer to BCD
OUT, N
BTI
IN, OUT
Convert Byte to Integer
SLB
OUT, N
ITB
IN, OUT
Convert Integer to Byte
SLW
OUT, N
ITD
IN, OUT
SLD
OUT, N
Convert Integer to Double
Integer
RRB
OUT, N
DTI
IN, OUT
Convert Double Integer to
Integer
DTR
IN, OUT
Convert DWord to Real
RRW
OUT, N
RRD
OUT, N
RLB
Shift Left Byte, Word, DWord
Rotate Right Byte, Word,
DWord
TRUNC
OUT, N
RLW
OUT, N
RLD
OUT, N
FILL
Shift Right Byte, Word, DWord
IN, OUT, N
Rotate Left Byte, Word, DWord
Fill memory space with pattern
Logic Operations
IN, OUT
Convert Real to DWord
ROUND IN, OUT
Convert Real to Double Integer
ATH
IN, OUT, LEN
Convert ASCII to Hex
HTA
IN, OUT, LEN
Convert Hex to ASCII
ITA
IN, OUT, FMT
Convert Integer to ASCII
DTA
IN, OUT, FM
Convert Double Integer to
ASCII
RTA
IN, OUT, FM
Convert Real to ASCII
ALD
And for combinations
OLD
Or for combinations
LPS
Logic Push (stack control)
DECO IN, OUT
Decode
LRD
Logic Read (stack control)
ENCO IN, OUT
Encode
LPP
Logic Pop (stack control)
LDS
Load Stack (stack control)
AENO
And ENO
ANDB IN1, OUT
ANDW IN1, OUT
Logical And of Byte, Word, and
DWord
ANDD IN1, OUT
ORB
Logical Or of Byte, Word, and
DWord
Conditional Return from Int.
ENI
Enable Interrupts
DISI
Disable Interrupts
OUT
INVW OUT
OUT
Attach Interrupt routine to event
Detach event
DTCH EVENT
Communication
Logical XOr of Byte, Word, and
DWord
XORD IN1, OUT
G-6
CRETI
IN1, OUT
XORW IN1, OUT
INVD
Generate 7-segment pattern
Interrupt
ATCH INT, EVENT
XORB IN1, OUT
INVB
IN, OUT
IN1, OUT
ORW IN1, OUT
ORD
SEG
XMT
TABLE,PORT
Freeport transmission
RCV
TABLE,PORT
Freeport receive message
NETR TABLE,PORT
Network Read
NETW TABLE,PORT
Network Write
High-Speed Instructions
Invert Byte, Word and DWord
HDEF HSC, Mode
Define High-Speed Counter
mode
HSC
N
Activate High-Speed Counter
PLS
X
Pulse Output
(1’s complement)
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Index
A
AC installation, guidelines, 2-13
AC outputs, 2-17
Access restriction. See Password
Accessing
direct addressing, 5-2
memory areas
& and *, 5-13
indirect addressing, 5-13–5-15
modifying a pointer, 5-14
operand ranges, 8-8
Accumulators, addressing, 5-10
Adapter, null modem, 7-25–7-26, 7-37, 7-40
Add Double Integer instruction, 9-73
Add instruction, 10-19
Add Integer instruction, 9-72
Add Real instruction, 9-81
Add to Table instruction, 9-104
Addressing
accumulators, 5-10
analog inputs, 5-9
analog outputs, 5-9
bit memory area, 5-5
byte:bit addressing, 5-2
counter memory area, 5-8
expansion I/O, 6-2
High-Speed Counters, 9-36
high-speed counter memory area, 5-11
indirect (pointers), 5-13–5-15
& and *, 5-13
modifying a pointer, 5-14
local I/O, 6-2
memory areas, 5-2
network devices, 7-28
process-image input register, 5-4
process-image output register, 5-4
sequence control relay memory area, 5-5
special memory bits, 5-5
timer, 5-7
variable memory, 5-5
Agency approvals, iv, A-2
Algorithm for PID loop control, 9-85–9-89
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Analog adjustment, 6-13
SMB28, SMB29, C-6
Analog expansion module, addressing, 6-2
Analog input filter, 6-9
Analog inputs
accessing, 4-22
addressing, 5-9
read value interrupt routine, 9-175
Analog outputs
accessing, 4-23
addressing, 5-9
And Byte instruction, 9-110
And Double Word instruction, 9-112
And instruction, 10-26
And Load instruction, 9-192–9-194
And Word instruction, 9-111
ASCII constant, 5-4
ASCII to HEX instruction, 9-135
Assistance, additional, v
Attach Interrupt instruction, 9-165
B
Battery cartridge, 5-15
order number, E-1
specifications, A-28
Baud rates, switch selections on the PC/PPI
cable, 3-5, 7-35, 7-38, A-30
BCD to Integer instruction, 9-126, 10-33
Bias
adjustment, PID loop control, 9-91
PID algorithm, 9-87
Biasing, network, 7-32
Bit access, 5-2
CPU 221/222/224, 8-8
Bit memory, 5-2
addressing, 5-5
Bits, special memory, C-1–C-13
Block Move Byte instruction, 9-100
Block Move Double Word instruction, 9-100
Block Move instruction, 10-25
Block Move Word instruction, 9-100
Index-1
Index
Boolean contact instructions, example, 9-5,
10-3
Bus connector, removing expansion modules,
2-8
Byte, and integer range, 5-4
Byte access, 5-2
CPU 221/222/224, 8-8
using pointer, 5-14
Byte address format, 5-2
Byte memory, 5-2
Byte to Integer instruction, 9-129, 10-35
C
Cables
order number, E-2
PC/PPI, setting parameters, 7-10
PROFIBUS network, 7-33
removing modules, 2-8
Calculating power requirements, 2-18, 2-20
Call Subroutine, with parameters, 9-146
Canadian Standards Association (CSA), A-2
CE certification, A-2
Changing a pointer, 5-14
Character interrupt control, 9-188
Clearance requirements, 2-3
Clock, status bits, C-1
Clock cartridge, specifications, A-28
Clock, Real-Time, 9-70
Communication instructions
Network Read, 9-176
Network Write, 9-176
Receive, 9-182
Transmit, 9-182
Communication port
interrupts, 9-169
pin assignment, 7-31
Index-2
Communications
baud rates, 7-26
changing parameters for PLC, 3-10
checking setup, 7-4
connecting computer for, 7-2
connecting PC/PPI cable, 3-5
Freeport mode, 9-183, C-6
hardware
installing with Windows NT, 7-8
installing/removing, 3-2–3-4
modem, 7-25–7-30
MPI, 7-29
network components, 7-31
PPI, 7-2, 7-29
processing requests, 4-23
PROFIBUS protocol, 7-30
protocols supported, 7-28
selecting a module parameter set, 7-9–7-10
setup, 7-2–7-19
using a CP card, 7-4–7-5
using modems, 7-16
using the MPI card, 7-4–7-5
Communications processor (CP), order
number, E-1
Compare Byte instruction, 9-10
Compare Double Word instruction, 9-12
Compare Equal instruction, 10-7
Compare Greater Than instruction, 10-9
Compare Greater Than or Equal instruction,
10-10
Compare Integer instruction, 9-11
Compare Less Than instruction, 10-8
Compare Less Than or Equal instruction, 10-9
Compare Not Equal instruction, 10-8
Compare Real instruction, 9-13
Comparison, S7-200 CPUs, 1-3
Comparison contact instructions
Compare Byte, 9-10
Compare Double Word, 9-12
Compare Equal, 10-7
Compare Greater Than, 10-9
Compare Greater Than or Equal, 10-10
Compare Integer, 9-11
Compare Less Than, 10-8
Compare Less Than or Equal, 10-9
Compare Not Equal, 10-8
Compare Real, 9-13
example, 9-14
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Index
Compiling, errors
rule violations, B-4
system response, 4-38
Configuration
communications hardware, 3-2, 7-3
creating drawings, 4-4
of PC with CP card and programming
device, 7-12
of PC with MPI card and programming
device, 7-12
output states, 6-8
retentive ranges of memory, 5-19
Connections, MPI logical, 7-29
Connector terminal identification
CPU 221 AC/DC/Relay, A-10
CPU 221 DC/DC/DC, A-10
CPU 222 AC/DC/Relay, A-15
CPU 222 DC/DC/DC, A-15
CPU 224 AC/DC/Relay, A-20
CPU 224 DC/DC/DC, A-20
EM221 Digital Input 8 x 24VDC, A-22
EM222 Digital Output 8 x 24 VDC, A-24
EM222 Digital Output 8 x Relay, A-24
EM223 Digital Combination 8 In/8 Out, A-27
EM223 Digital Combination 8 x 24 VDC/8 x
Relay, A-27
Connectors
bus expansion port, removing cover, 2-8
network, 7-32
order number, E-2
Considerations
hardware installation, 2-2–2-4
high-vibration environment, 2-7
using DIN rail stops, 2-7
using Watchdog Reset instruction, 9-142
vertical installations, 2-7
Constants, 5-12
Contact instructions
example, 9-5, 10-3
Negative Transition, 10-3
Not, 9-4
Positive Transition, 10-3
Reset Dominant Bistable, 10-6
Set Dominant Bistable, 10-6
standard contacts, 10-2
Control bits, High-Speed Counter, 9-37
Conventions, Mirco/WIN 32 programming, 8-2
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Conversion instructions, 4-16
ASCII to HEX, 9-135
BCD to Integer, 9-126, 10-33
Byte to Integer, 9-129, 10-35
Decode, 9-131
Double Integer to ASCII, 9-138
Double Integer to Integer, 9-128, 10-34
Double Integer to Real, 9-126, 10-33
Encode, 9-131
HEX to ASCII, 9-135
Integer to ASCII, 9-136
Integer to BCD, 9-126, 10-33
Integer to Byte, 9-129, 10-36
Integer to Double Integer, 9-128, 10-35
Real to ASCII, 9-139
Real to Double Integer, 10-34
Round, 9-127
Segment, 9-133
Truncate, 9-127, 10-32
Converting
integer to real number, 9-89
loop inputs, 9-89
real number to normalized value, 9-89
Count Down Counter instruction, 10-16
Count Up Counter instruction, 10-15
Count Up/Down Counter, 10-17
Counter instructions, 9-24
Count Down, 10-16
Count Up, 10-15
Count Up/Down, 10-17
example, 9-25, 10-18
operation, 10-15, 10-16, 10-17
Counters
addressing memory area, 5-8
CPU 221/222/224, 8-7
types, 5-8
variables, 5-8
CP (communications processor) card, 7-4
configuration with PC, 7-12
CP 5511
order number, E-1
setting up the MPI Card (PPI) parameters,
7-14
CP 5611
order number, E-1
setting up the MPI Card (PPI) parameters,
7-14
Index-3
Index
CPU
basic operation, 4-5
clearing memory, 4-29
error handling, 4-36
fatal errors, B-2
general technical specifications, A-3
going online, 3-9
hardware supported for network
communications, 7-3
ID register (SMB6), C-4
memory areas, 5-2
memory ranges, G-3
modem connection, 7-25–7-30
module, 1-5
operand ranges, 8-8
password, 4-27
power requirements, 2-18
scan cycle, 4-22
selecting mode, 4-25
CPU 221
backup, 1-3
comm ports, 1-3
expansion modules, 1-3
features, 8-7
I/O, 1-3
I/O numbering example, 6-3
input filters, 1-3
instructions supported, 1-3
interrupts, maximum, 9-172
interrupts supported, 1-3
memory, 1-3
ranges, 8-7
operand ranges, 8-8
protocols supported, 1-3
summary, 1-3
CPU 221 AC/DC/Relay
connector terminal identification, A-10
order number, E-1
specifications, A-6
CPU 221 DC/DC/DC
connector terminal identification, A-10
order number, E-1
specifications, A-6
Index-4
CPU 222
backup, 1-3
comm ports, 1-3
expansion modules, 1-3
features, 8-7
I/O, 1-3
input filters, 1-3
instructions supported, 1-3
interrupts, maximum, 9-172
interrupts supported, 1-3
memory, 1-3
ranges, 8-7
operand ranges, 8-8
protocols supported, 1-3
summary, 1-3
CPU 222 AC/DC/Relay
connector terminal identification, A-15
order number, E-1
specifications, A-11
CPU 222 DC/DC/DC
connector terminal identification, A-15
order number, E-1
specifications, A-11
CPU 224
backup, 1-3
comm ports, 1-3
expansion modules, 1-3
features, 8-7
I/O, 1-3
I/O numbering example, 6-3
input filters, 1-3
instructions supported, 1-3
interrupts, maximum, 9-172
interrupts supported, 1-3
memory, 1-3
ranges, 8-7
memory ranges, 8-7
operand ranges, 8-8
protocols supported, 1-3
summary, 1-3
terminal block connector, 2-12
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Index
CPU 224 AC/DC/Relay
connector terminal identification, A-20
order number, E-1
specifications, A-16
CPU 224 DC/DC/DC
connector terminal identification, A-20
order number, E-1
specifications, A-16
CPU modules
dimensions
CPU 221, 2-4
CPU 222, 2-4
CPU 224, 2-5
expansion I/O modules, 2-5
screw sizes for installation, 2-4–2-6
installation procedure, panel, 2-6
procedure, removing, 2-8
screw sizes for installation, 2-4–2-6
Creating a program, example: set up timed
interrupt, 4-18
Current time values, updating, 9-19
Cycle time, Pulse train output (PTO) function,
9-60
D
Data checking, 5-12
Data types
checking, 4-12–4-16
advantages, 4-14
complex, 4-12
elementary, 4-11
Data typing, 5-12
Date, setting, 9-70
DC installation, guidelines, 2-14
DC relay, 2-17
DC transistor, protecting, 2-16
Debugging, program, 4-30–4-32
Decimal constant, 5-4
Decode instruction, 9-131
Decrement Byte instruction, 9-78
Decrement Double Word instruction, 9-79
Decrement instruction, 10-22
Decrement instructions
Decrement Byte, 9-78
Decrement Double Word, 9-79
Decrement Word, 9-78
example, 9-80, 10-23
Subtract Double Integer, 9-73
Subtract Integer, 9-72
Decrement Word instruction, 9-78
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Designing a Micro PLC system, 4-2
Detach Interrupt instruction, 9-165
Differential term, PID algorithm, 9-88
Digital expansion module, addressing, 6-2
Digital inputs
and pulse catch, 6-5
reading, 4-22
Digital outputs, writing to, 4-23
Dimensions
CPU 221, 2-4
CPU 222, 2-4
CPU 224, 2-5
expansion I/O modules, 2-5
memory cartridge, A-28
screw sizes for installation, 2-4–2-6
DIN rail
clearance requirements, 2-3–2-5
dimensions, 2-4
high-vibration installations, 2-7
installation procedure, 2-7
order number, E-2
using DIN rail stops, 2-7
vertical installations, 2-7
Diode suppression, 2-16
DIP switch settings, PC/PPI cable, 3-5, 7-38
Direct addressing, 5-2
for overloaded instructions, 4-15
Disable Interrupt instruction, 9-169
Divide Double Integer instruction, 9-75
Divide instruction, 10-20
Divide Integer instruction, 9-74
Divide Integer to Double Integer instruction,
9-76
Divide Real instruction, 9-82
Documentation, related, iv
Double Integer to ASCII instruction, 9-138
Double Integer to Integer instruction, 10-34
Double Integer to Integer instruction, 9-128
Double Integer to Real instruction, 9-126,
10-33
Double word, and integer range, 5-4
Double word access, CPU 221/222/224, 8-8
Index-5
Index
Downloading
mode requirements, 4-25
program, 5-15
EM223 24VDC Digital Combination 8 In/8 Out,
order number, E-1
EN/ENO, guidelines, 4-18
Enable Interrupt instruction, 9-169
Encode instruction, 9-131
End instruction, 9-141
E
ENO instructions, 9-164
Editors
Environmental specifications, A-3
Function Block Diagram (FBD), 4-9
Equipment requirements
Ladder Logic (LAD), 4-8
S7-200, 1-2
Statement List (STL), 4-6
STEP 7-Micro/WIN 32, 3-2
EEPROM, 5-15, 5-17
Error handling
copying V memory, 5-20
fatal errors, 4-36, 4-37
error codes, B-2
non-fatal errors, 4-38
saving from V memory, C-7
responding to errors, 4-36
Electric service life, A-5
restarting the CPU after a fatal error, 4-37
Electromagnetic compatibility, S7-200, A-4
Errors
Electromagnetic emission standards, A-2
compile rule violations, B-4
Electromagnetic immunity standards, A-2
fatal, B-2
EM221 24 VDC 8 Digital Input Module
Network Read/Network Write, 9-176
connector terminal identification, A-22
non-fatal, B-3, B-4
specifications, A-21
PID loop, 9-93
EM221 24 VDC Digital 8 Inputs, order number,
run-time programming, B-3
E-1
SMB1, execution errors, C-2
EM222 24 VDC Digital 8 Inputs, order number,
European Community (EC) certification, A-2
E-1
Examples
EM222 24 VDC Digital Output Module
Add to Table, 9-105
connector terminal identification, A-24
analog adjustment, 6-13
specifications, A-23
And, Or, Exclusive Or, 9-113–9-115,
EM222 24 VDC Output/Relay Module
10-27–10-29
connector terminal identification, A-24
ASCII to HEX, 9-135
specifications, A-23
block move, 9-101–9-103
EM222 Relay 8 Outputs, order number, E-1
calculating power requirements, 2-18
EM223 24 VDC 8 In/8Out Module
call to subroutine, 9-149–9-151
connector terminal identification, A-27
comparison contact instructions, 9-14
specifications, A-25
contact instructions, 9-5, 10-3
EM223 24 VDC 8 In/8 Relay Module
Convert and Truncate, 9-130, 10-36
connector terminal identification, A-27
counter, 9-25, 10-18
specifications, A-25
Decode/Encode, 9-132
EM223 24 VDC Digital Combination 8 In/8
decrement, 9-80, 10-23
Relay, order number, E-1
First-In-First-Out, 9-108
For/Next, 9-152–9-154
High-Speed Counter, 9-47
high-speed counter
operation of HSC0 Mode 0 and HSC1 or
HSC2 Modes 0, 1, or 2, 9-29
operation of HSC1 or HSC2 Modes 3, 4,
or 5, 9-30
operation of HSC1 or HSC2, Modes 6, 7
or 8, 9-30
operation of HSC1 or HSC2, Modes 9,
10, or 11, 9-31
Index-6
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Index
operation with Reset and Start, 9-29
operation with Reset and without Start,
9-28
I/O numbering, 6-2, 6-3
increment, 9-80, 10-23
Interrupt Routine instructions, 9-174
Invert, 9-115–9-117
Jump to Label, 9-144–9-146
Last-In-First-Out, 9-109
logic stack, 9-194–9-196
loop control (PID), 9-94–9-96
math, 9-77, 9-83, 10-21
memory fill, 9-103–9-105
move and swap, 9-102–9-104, 10-25–10-27
MPI card with master/slave, 7-4
Network Read/Network Write, 9-178–9-180
on-delay timer, 9-20, 9-21, 10-13, 10-14
output instructions, 9-9, 10-5
Pulse Train Output, 9-65, 9-68
Pulse width modulation, 9-63
Real number conversion instruction, 9-130,
10-36
retentive on-delay timer, 9-22
Segment, 9-134
Sequence Control Relay, 9-155–9-160
conditional transitions, 9-162
convergence control, 9-159–9-162
divergence control, 9-157
set up timed interrupt, 4-18
shift and rotate, 9-122–9-124, 10-31–10-33
shift register bit, 9-125–9-127
Stop, End, and Watchdog Reset,
9-143–9-145
Table Find, 9-107
TD 200s added to network, 7-12
transmit instructions, 9-189
Truncate, 9-130, 10-36
Exclusive Or Byte instruction, 9-110
Exclusive Or Double Word instruction, 9-112
Exclusive Or instruction, 10-26
Exclusive Or Word instruction, 9-111
Execution times, STL instructions, F-1
Expansion cable, specifications and
installation, A-29
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Expansion modules, 1-4, 1-5
addressing I/O points, 6-2
dimensions
8- and 16-point I/O modules, 2-5
CPU 221, 2-4
CPU 222, 2-4
CPU 224, 2-5
screw sizes for installation, 2-4–2-6
flexible ribbon cable, 1-5
ID and error register (SMB8 to SMB21),
C-5
installation procedure
panel, 2-6
rail, 2-7
removing the bus expansion port
connector, 2-6–2-8
order numbers, E-1
power requirements, 2-18
removal procedure, 2-8
screw sizes for installation, 2-4–2-6
terminal block connector, 2-12
F
Factory Mutual Research, A-2
Fatal errors, B-2
and CPU operation, 4-37
Field wiring
installation procedure, 2-9
optional connector, 2-11
wire sizes, 2-9
Fill instructions
example, 9-103–9-105
Memory Fill, 9-103
Find instructions, 9-104–9-109
Add to Table, 9-104
First-In-First-Out, 9-108
Last-In-First-Out, 9-109
Table Find, 9-106
First-In-First-Out instruction, 9-108
Flexible ribbon cable, expansion module, 1-5
Floating-point values, loop control, 9-89
Floating-point values, representing, 5-4
Index-7
Index
For instruction, 9-150
Force function, 4-34
Freeport mode
and operation modes, 9-183
character interrupt control, 9-188
definition, 9-169
enabling, 9-183
initializing, 9-184
operation, 9-183
SMB2, freeport receive character, C-2
SMB3, freeport parity error, C-2
SMB30, SMB130 freeport control registers,
9-184, C-6
user-defined protocol, 7-30
using the PC/PPI cable, 7-35–7-36
Freeze outputs, 6-8
Function Block Diagram
basic elements, 4-6
program status, 4-33
Function Block Diagram Editor, 4-9
G
Gap update factor (GUF), 7-41
Grounding and circuit, wiring guidelines, 2-10
GUF. See Gap update factor
Guidelines
AC installation, 2-13
DC installation, 2-14
designing a PLC system, 4-2–4-4
grounding and circuit, 2-10
high-vibration environment, 2-7
modifying a pointer for indirect addressing,
5-14
suppression circuits, 2-16
AC output, 2-17
DC relay, 2-17
using DIN rail stops, 2-7
vertical installations, 2-7
wiring, 2-9
isolation, 2-10
H
Hardware
installing in Micro/WIN 32, 7-7
removing in Micro/WIN 32, 7-7
Help. See Online help
HEX PTO/PWM Reference Table, 9-56
HEX to ASCII instruction, 9-135
Hexidecimal constant, 5-4
Index-8
High potential isolation test, A-4
High Speed Counter, modes, G-4
High-Speed Counter, SMB36 - SMB 65 HSC
register, C-9
High-Speed Counter Definition instruction, 9-27
counter mode, 9-36
High-Speed Output
changing pulse width, 6-12
operation, 9-49
PTO/PWM operation, SMB66-SMB85
special memory bytes, C-11
High-Speed Output instructions. See
PTO/PWM functions
High-vibration environment, using DIN rail
stops, 2-7
High-Speed Counter, memory area,
addressing, 5-11
High-speed counters, 9-40
Highest station address (HSA), 7-41
High-Speed Counter, 6-10, 9-27–9-46
addressing, 9-36
changing direction, 9-45
control byte, 9-38
disabling, 9-46
examples, 9-28–9-31, 9-47
HSC interrupts, 9-39
initialization modes, 9-41–9-44
input wiring, 9-32
loading new current/preset value, 9-45
modes of operation, 9-33
operation, 9-28
selecting active state, 9-37
setting current and preset values, 9-38
status byte, 9-39
timing diagrams, 9-28–9-31
High-Speed Counter (HSC) box, 9-27
High-Speed Counter Definition (HDEF) box,
9-27
High-Speed Counter instructions, 9-27–9-48
High-Speed Counter Definition, 9-27
High-Speed Counter, 9-27
High-speed I/O, 6-10
High-Speed Pulse Output, 6-10
HSA. See Highest station address
HSC register, C-9
HSC3, HSC4, HSC5, SMB130 - SMB165,
C-15
I
I/O expansion cable, installation, A-29
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Index
I/O status, SMB5, C-3
IEC 1131-3 instruction set, 4-10
IEC 1131-3 variable data typing, 4-11
Immediate contact instructions, 9-3
Immediate I/O, 4-24
Increment Byte instruction, 9-78
Increment Double Word instruction, 9-79
Increment instruction, 10-22
Increment instructions
Add Double Integer, 9-73
Add Integer, 9-72
example, 9-80, 10-23
Increment Byte, 9-78
Increment Double Word, 9-79
Increment Word, 9-78
Increment Word instruction, 9-78
Incrementing a pointer, 5-14
Indirect addressing, 5-13–5-15
& and *, 5-13
modifying a pointer, 5-14
Initialization
freeport mode, 9-184
High-Speed Counters, 9-41–9-44
PTO/PWM functions, 9-58
Pulse train output (PTO) function, 9-60
PWM function, 9-59
Input filter
and pulse catch, 6-5
noise rejection, 6-4
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Input image register, 4-24
Inputs, basic operation, 4-5
Install/Remove dialog box, 7-7
Installation
clearance requirements, 2-3
communications hardware, 3-2–3-4
special instructions for Windows NT
users, 7-8
configurations, 2-2
dimensions
CPU 221, 2-4
CPU 222, 2-4
CPU 224, 2-5
expansion I/O modules, 2-5
screw sizes for installation, 2-4–2-6
standard rail, 2-4
high-vibration environment, using DIN rail
stops, 2-7
I/O expansion cable, A-29
memory cartridge, 5-22
Micro/WIN 32, 3-3
procedure
expansion module, 2-6–2-8
panel, 2-6
rail, 2-7
screw sizes for installation, 2-4–2-6
Instruction sets
IEC 1131-3, 4-10
SIMATIC, 4-10
Instructions
Add, 10-19
Add Double Integer, 9-73
Add Integer, 9-72
Add Real, 9-81
Add to Table, 9-104
And Byte, 9-110
And Double Word, 9-112
And Load, 9-192–9-194
And Word, 9-111
ASCII to HEX, 9-135
Attach Interrupt, 9-165
BCD to Integer, 9-126, 10-33
Block Move, 10-25
Block Move Byte, 9-100
Block Move Double Word, 9-100
Block Move Word, 9-100
Byte to Integer, 9-129, 10-35
Compare Byte, 9-10
Compare Double Word, 9-12
Compare Equal, 10-7
Compare Greater Than, 10-9
Compare Greater Than or Equal, 10-10
Index-9
Index
Compare Integer, 9-11
Compare Less Than, 10-8
Compare Less Than or Equal, 10-9
Compare Not Equal, 10-8
Compare Real, 9-13
conversion, 4-16–4-18
Count Down, 10-16
Count Up, 10-15
Count Up/Down, 10-17
counter, 9-24
Decode, 9-131
Decrement, 10-22
Decrement Byte, 9-78
Decrement Double Word, 9-79
Decrement Word, 9-78
Detach Interrupt, 9-165
Disable Interrupt, 9-169
Divide Double Integer, 9-75
Divide Integer, 9-74
Divide Integer to Double Integer, 9-76
Divide Real, 9-82
Double Integer to ASCII, 9-138
Double Integer to Integer, 9-128, 10-34
Double Integer to Real, 9-126, 10-33
Enable Interrupt, 9-169
Encode, 9-131
End, 9-141
ENO, 9-164
Exclusive Or, 10-26
Exclusive Or Byte, 9-110
Exclusive Or Double Word, 9-112
Exclusive Or Word, 9-111
execution times, F-1
Find, 9-104–9-109
First-In-First-Out, 9-108
For, 9-150
HEX to ASCII, 9-135
High-Speed Counter, 9-27–9-48
High-Speed Counter Definition, 9-27
High-Speed Counter (HSC) box, 9-27
High-Speed Counter Definition (HDEF) box,
9-27
High-Speed Output, 6-12, 9-49–9-69
immediate contacts, 9-3
Increment Byte, 9-78
Increment Double Word, 9-79
Increment Word, 9-78
incrementing a pointer, 5-14
Integer to ASCII, 9-136
Integer to BCD, 9-126, 10-33
Integer to Byte, 9-129, 10-36
Integer to Double Integer, 9-128, 10-35
Index-10
Interrupt Routine, 9-167
Invert Byte, 9-114
Invert Double Word, 9-114
Invert Word, 9-114
Jump to Label, 9-144
Last-In-First-Out, 9-109
Load Stck, 9-193–9-195
Logic Pop, 9-193–9-195
Logic Push, 9-192–9-194
Logic Read, 9-192–9-194
Loop Control (PID), 9-84–9-98
Memory Fill, 9-103
modifying a pointer, 5-14
Move and Assign Values, 10-24
Move Byte, 9-99
Move Double Word, 9-99
Move Real, 9-99
Move Word, 9-99
Multiply, 10-20
Multiply Double Integer, 9-75
Multiply Integer, 9-74
Multiply Integer to Double Integer, 9-76
Multiply Real, 9-82
Negative Transition, 9-4, 10-3
Network Read, 9-176
Network Write, 9-176
Next, 9-150
No Operation, 9-8
Not, 9-4, 10-28
Off-Delay Timer, 9-15
Off-Delay Timer, 10-12
On-Delay Timer, 9-15, 10-11
On-Delay Timer Retentive, 9-15
Or, 10-26
Or Byte, 9-110
Or Double Word, 9-112
Or Load, 9-192–9-194
Or Word, 9-111
Output (coil), 9-6, 10-4
Output immediate, 9-6
overloaded, 4-15
PID, 9-84–9-98
Positive Transition, 9-4, 10-3
Pulse (PLS), 6-12
Pulse (PLS) box, 6-12
Pulse Output, 9-49
Pulse Timer, 10-12
Read Real-Time Clock, 9-70
Real to ASCII, 9-139
Real to Double Integer, 10-34
Real-Time Clock, 9-70
Receive, 9-182
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Index
Reset, 9-7
Reset Dominant Bistable, 10-6
Reset Immediate, 9-8
Return from Interrupt Routine, 9-167
Return from Subroutine, 9-145
Rotate Left Byte, 9-119
Rotate Left Double Word, 9-121
Rotate Left Word, 9-120
Rotate Right, 10-30
Rotate Right Byte, 9-119
Rotate Right Double Word, 9-121
Rotate Right Word, 9-120
Round, 9-127
Segment, 9-133
Sequence Control Relay, 9-153
Set, 10-4
Set Dominant Bistable, 10-6
Set Real-Time Clock, 9-70
Shift Left, 10-29
Shift Left Byte, 9-116
Shift Left Double Word, 9-118
Shift Left Word, 9-117
Shift Register Bit, 9-123
Shift Register Bit (SHRB), 9-124
Shift Register Bit (SHRB) box, 9-124
Shift Right, 10-29
Shift Right Byte, 9-116
Shift Right Double Word, 9-118
Shift Right Word, 9-117
Square Root, 9-98, 10-22
standard contacts, 9-2, 10-2
Stop, 9-141
Subtract, 10-19
Subtract Double Integer, 9-73
Subtract Real, 9-81
Swap Bytes, 9-102
Table, 9-104–9-109
Table Find, 9-106
Transmit, 9-182
Truncate, 9-127, 10-32
Watchdog Reset, 9-142–9-144
Integer, converting to real number, 9-89
Integer to ASCII instruction, 9-136
Integer to BCD instruction, 9-126, 10-33
Integer to Byte instruction, 9-129, 10-36
Integer to Double Integer instruction, 9-128,
10-35
Integral term, PID algorithm, 9-87
Interface parameters, verifing default, 3-6
Internet address, Siemens, v
Interrupt events, description, G-2
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Interrupt instructions
Attach Interrupt, 9-165
Detach Interrupt, 9-165
Disable Interrupt, 9-169
Enable Interrupt, 9-169
example, 9-174
Interrupt Routine, 9-167
operation, 9-165
Return from Interrupt Routine, 9-167
Interrupt Routine instruction, 9-167
Interrupt routines, guidelines, 4-18
Interrupts
and scan cycle, 4-24
bit definitions for queue overflow, 9-172
CPU 221/222/224, 8-7
data shared with main program, 9-168
enabling and disabling, 9-169
event types and numbers
CPU 221/222/224, 9-165
priority, 9-173
High-Speed Counters, 9-39
HSC, 9-40
I/O, 9-169
priority, 9-172
queues, 9-172
restrictions for using, 9-167
rising/falling edge, 9-169
routines, 9-167
setting up, 9-165
system support, 9-167
timed, 9-171, C-8
set up to read analog input, 9-175
Invert Byte instruction, 9-114
Invert Double Word instruction, 9-114
Invert Word instruction, 9-114
Isolated DC wiring guidelines, 2-14
J
Jump to Label instruction, 9-144
L
Label instruction, 9-144
Ladder logic
basic elements, 4-6
program status, 4-32
Ladder Logic Editor, 4-8
Last-In-First-Out instruction, 9-109
Load Stack instruction, 9-193–9-195
Index-11
Index
Local I/O, addressing, 6-2
Logic Operations instructions
And, 10-26
And Byte, 9-110
And Double Word, 9-112
And Word, 9-111
example
And, Or, Exclusive Or, 9-113–9-115,
10-27–10-29
Invert, 9-115–9-117
Exclusive Or, 10-26
Exclusive Or Byte, 9-110
Exclusive Or Double Word, 9-112
Exclusive Or Word, 9-111
Invert Byte, 9-114
Invert Double Word, 9-114
Invert Word, 9-114
Not, 10-28
Or, 10-26
Or Byte, 9-110
Or Double Word, 9-112
Or Word, 9-111
Logic Pop instruction, 9-193–9-195
Logic Push instruction, 9-192–9-194
Logic Read instruction, 9-192–9-194
Logic stack, Sequence Control Relays (SCRs),
9-153
Logic Stack instructions
And Load, 9-192–9-194
example, 9-194–9-196
Load Stack, 9-193–9-195
Logic Pop, 9-193–9-195
Logic Push, 9-192–9-194
Logic Read, 9-192–9-194
operation, 9-193
Or Load, 9-192–9-194
Logical connections, MPI, 7-29
Loop control
adjusting bias, 9-91
converting inputs, 9-89
converting outputs, 9-90
error conditions, 9-93
forward/reverse, 9-90
loop table, 9-93
modes, 9-92
program example, 9-94–9-96
ranges/variables, 9-90
selecting type, 9-88
Loop Control (PID) instructions, 9-84–9-98
example, 9-94–9-96
Loop table, 9-93
Index-12
M
Manuals, order number, E-2
Master devices
modem, 7-25
MPI protocol, 7-4, 7-29
PPI protocol, 7-29
PROFIBUS protocol, 7-30
Math instructions
Add, 10-19
Add Double Integer, 9-73
Add Integer, 9-72
Add Real, 9-81
Decrement, 10-22
Divide, 10-20
Divide Double Integer, 9-75
Divide Integer, 9-74
Divide Integer to Double Integer, 9-76
Divide Real, 9-82
example, 9-77, 9-83, 10-21
Increment, 10-22
Multiply, 10-20
Multiply Double Integer, 9-75
Multiply Integer, 9-74
Multiply Integer to Double Integer, 9-76
Multiply Real, 9-82
Square Root, 9-98, 10-22
Subtract, 10-19
Subtract Double Integer, 9-73
Subtract Integer, 9-72
Subtract Real, 9-81
Memory, clearing, 4-29
Memory areas
accessing data, 5-2
bit memory, 5-2
byte memory, 5-2
CPU, 5-2
operand ranges, 8-8
Memory cartridge
copying to, 5-22
dimensions, A-28
error codes, B-2
installing, 5-22
order number, E-1
removing, 5-22
restoring the program, 5-24
specifications, A-28
using, 5-22
Memory Fill instruction, 9-103
Memory ranges, G-3
CPU 221/222/224, 8-7
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Index
Memory retention, 5-15–5-20
battery cartridge (optional), 5-15
EEPROM, 5-15, 5-17, 5-20
power-on, 5-17–5-21
ranges, 5-19
super capacitor, 5-15
Messages, token-passing network, 7-43
Micro/WIN 32
equipment requirements, 3-2
installing, 3-3
troublehsooting, 3-4
programming conventions, 8-2
Mode control, PID loops, 9-92
Mode switch, operation, 4-25
Modem
10-bit, 7-23
11-bit, 7-25
cable requirements, 7-25
network communications, 7-25–7-30
null modem adapter, 7-37, 7-40
PC/PG to CPU connection, 7-25–7-26
setting up communication, 7-16
using with the PC/PPI cable, 7-37, 7-40
Modes. See Operation modes
Modes of operation, High-Speed Counters,
9-33
Modifying a pointer (indirect addressing), 5-14
Module parameter set
MPI Card (PPI), 7-14
PC/PPI Cable (PPI), 7-10–7-11
selecting, 7-9–7-10
Monitoring
program, 4-30–4-32
program status, 4-32, 4-33
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Mounting
clearance requirements, 2-3
dimensions
CPU 221, 2-4
CPU 222, 2-4
CPU 224, 2-5
expansion I/O modules, 2-5
screw sizes for installation, 2-4–2-6
standard rail, 2-4
high-vibration environment, using DIN rail
stops, 2-7
procedure
expansion module, 2-6–2-8
panel, 2-6
rail, 2-7
removal procedure, 2-8
screw sizes for installation, 2-4–2-6
vertical positioning, using DIN rail stops, 2-7
Move and Assign Values instruction, 10-24
Move Byte instruction, 9-99
Move Double Word instruction, 9-99
Move instructions
Block Move, 10-25
Block Move Byte, 9-100
Block Move Double Word, 9-100
Block Move Word, 9-100
example of block move, 9-101–9-103
example of move and swap, 9-102–9-104,
10-25–10-27
Move, 10-24
Move Byte, 9-99
Move Double Word, 9-99
Move Real, 9-99
Move Word, 9-99
Swap Bytes, 9-102
Move Real instruction, 9-99
MPI (multipoint interface), protocol, 7-29
baud rate, 7-4
MPI card, 7-4
configuration with PC, 7-12
PPI parameters, 7-14
setting up the MPI Card (PPI) parameters,
7-14
MPI communications, 7-29
CP cards, 7-4
MPI logical connections, 7-29
Index-13
Index
Multiple master network, 7-4
Multiple Master Network check box, 7-11
Multiply Double Integer instruction, 9-75
Multiply instruction, 10-20
Multiply Integer instruction, 9-74
Multiply Integer to Double Integer instruction,
9-76
Multiply Real instruction, 9-82
N
Negative Transition instruction, 9-4, 10-3
Network
biasing, 7-32
cable specifications, 7-33
communication port, 7-31
communications setup, 7-2–7-19
components, 7-31
connectors, 7-32
device address, 7-28
gap update factor (GUF), 7-41
highest station address (HSA), 7-41
installing communications hardware,
3-2–3-4
master devices, 7-28
multiple master, 7-4
optimizing performance, 7-41
repeaters, 7-34
segments, 7-28
selecting the parameter set, 7-9
sending messages, 7-43
slave devices, 7-28
terminating, 7-32
token rotation time, 7-44–7-47
Network Read instruction, 9-176
errors, 9-176
example, 9-178–9-180
Network Write instruction, 9-176
errors, 9-176
example, 9-178–9-180
Next instruction, 9-150
No Operation instruction, 9-8
Noise rejection, input filter, 6-4
Non-fatal errors
and CPU operation, 4-38
system response, 4-38
Not instruction, 9-4, 10-28
Null modem adapter, 7-25–7-26, 7-37, 7-40
Numbers
representation of, 5-4
using constant values, 5-12
Index-14
O
Off-Delay Timer instruction, 9-15, 10-12
On-Delay Timer function block, 10-11
On-Delay Timer instruction, 9-15
On-Delay Timer Retentive instruction, 9-15
Online, going online with CPU, 3-9
Online help, STEP 7-Micro/WIN 32, 3-2
Operand ranges, CPU 221/222/224, 8-8
Operation modes
and force function, 4-34
and Freeport communication, 9-183
changing, 4-25, 4-26
status bits, C-1
Operator Interface, order number, E-2
Operator stations, specifying, 4-4
Or Byte instruction, 9-110
Or Double Word instruction, 9-112
Or instruction, 10-26
Or Load instruction, 9-192–9-194
Or Word instruction, 9-111
Output (coil) instruction, 9-6, 10-4
Output image register, 4-24
Output immediate instruction, 9-6
Output instructions
example, 9-9, 10-5
No Operation, 9-8
Output (coil), 9-6, 10-4
Output immediate, 9-6
Reset, 9-7, 10-4
Reset Immediate, 9-8
Set, 10-4
Output table, configure output states, 6-8
Outputs
basic operation, 4-5
freezing, 6-8
high-speed pulse, 6-12
Overloaded instructions, 4-15
P
Panel
dimensions
CPU 221, 2-4
CPU 222, 2-4
expansion modules, 2-5
installation procedure, 2-6
removal procedure, 2-8
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Index
Parameter set, module
MPI Card (PPI), 7-14
PC/PPI Cable (PPI), 7-10–7-11
selecting, 7-9–7-10
Password
clearing, 4-29
CPU, 4-27
configuring, 4-28
lost, 4-29
privilege level, 4-27
restricting access, 4-27
PC/PPI cable
baud rate switch selections, 7-35, A-30
connection procedure, 3-5, 7-38
DIP switch settings, 3-5, 7-38
pin outs, A-31
setting up parameters, 7-10
specifications, A-30
using with a modem, 7-25–7-26, 7-37, 7-40
using with the Freeport communication
mode, 7-35–7-36
Peer-to-peer communications, 1-3
Permanent program storage, 5-20
PG/PC Interface dialog box, 7-6
Physical size
CPU 221, 2-4
CPU 222, 2-4
CPU 224, 2-5
expansion I/O modules, 2-5
screw sizes for installation, 2-4–2-6
PID algorithm, 9-85–9-89
PID instructions, 9-84–9-98
example, 9-94–9-96
PID Loop instruction
history bits, 9-92
modes, 9-92
PID loop table, 9-93
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
PID loops
adjusting bias, 9-91
converting inputs, 9-89
converting outputs, 9-90
CPU 221/222/224, 8-7
error conditions, 9-93
forward/reverse, 9-90
loop table, 9-93
modes, 9-92
program example, 9-94–9-96
ranges, variables, 9-90
selecting loop control type, 9-88
Pin assignment, communication port, 7-31
PLC, changing communications parameters,
3-10
Pointers, 5-13–5-15
& and *, 5-13
modifying a pointer, 5-14
Positive Transition instruction, 9-4, 10-3
Potentiometers, and SMB28, SMB29, 6-13
Power requirements
calculating, 2-18, 2-20
CPU, 2-18
expansion module, 2-18
sample, 2-19
table for calculating, 2-20
Power-on, memory retention, 5-17–5-21
PPI (point-to-point interface)
communications, 7-2, 7-29
protocol, 7-29
Process Field Bus standard, iv
Process variable, converting, 9-89
Process-image input register
addressing, 5-4
operation, 4-22
Process-image output register, 4-23
addressing, 5-4
PROFIBUS
communications, 7-30
network cable specifications, 7-33
network repeaters, 7-34
protocol, 7-30
PROFIBUS standard, pin assignment, 7-31
Index-15
Index
Program
analog inputs, 4-22
basic elements, 4-18
debugging, 4-30–4-32
downloading, 5-15
executing, 4-23
inputs/outputs, 4-5
monitoring, 4-30–4-32
monitoring status, 4-32, 4-33
restoring from memory cartridge, 5-24
saving permanently, 5-20
storage, 5-15–5-18, 5-22
structure, 4-18
uploading, 5-15
using Status/Force Chart, 4-31
using subroutines, 9-145
Program Control instructions
Call, example, 9-149–9-151
End, 9-141
example, 9-143–9-145
ENO, 9-164
For, 9-150
For/Next, example, 9-152–9-154
Jump to Label, 9-144
example, 9-144–9-146
Next, 9-150
Return from Subroutine, 9-145
Sequence Control Relay, 9-153
Stop, 9-141
example, 9-143–9-145
Watchdog Reset, 9-142–9-144
example, 9-143–9-145
Programming concepts, 4-5
Programming language, concepts, 4-6
Programming software, order numbers, E-1
Proportional term, PID algorithm, 9-87
Protocols. See Communications, protocols;
Module parameter set
PTO, PT1 Profile Definition Table, SMB166 SMB194, C-16
PTO/PWM functions
calculating profile table values, 9-54
control bits, 9-57
control register, 9-56
SMB66-SMB85, C-11
control registers, 9-56
cycle time, 9-57
hexadecimal reference table, 9-56
initialization, 9-58
pulse width/pulse count, 9-57
status bit, 9-57
PTO/PWM HEX Reference Table, 9-56
Index-16
Pulse (PLS), 6-12
Pulse (PLS) box, 6-12
Pulse catch, 6-5
Pulse Output instruction, 9-49
Pulse outputs, 6-12
Pulse Timer, 10-12
Pulse train output (PTO) function, 6-12, 9-49
changing cycle time, 9-60
changing cycle time and pulse count, 9-61
changing pulse count, 9-61
example, 9-65, 9-68
initializing, 9-60
operation, 9-51
Pulse width modulation (PWM) function, 6-12,
9-49
changing pulse width, 9-59
example, 9-63
initializing, 9-59
operation, 9-50
R
Rail
clearance requirements, 2-3–2-5
dimensions, 2-4
high-vibration installations, 2-7
installation procedure, 2-7
using DIN rail stops, 2-7
vertical installations, 2-7
Read Real-Time Clock instruction, 9-70
Real to ASCII instruction, 9-139
Real to Double Integer instruction, 10-34
Real-Time Clock instructions, 9-70
Read Real-Time Clock, 9-70
Set Real-Time Clock, 9-70
Receive instruction, 9-182, 9-185
SMB86-SMB94, SMB186-SMB194, C-12
Relays, resistor/capacitor networks, 2-17
Removal
clearance requirements, 2-3
correct orientation of module, 2-8
CPU, 2-8
dimensions
CPU 221, 2-4
CPU 222, 2-4
CPU 224, 2-5
expansion I/O modules, 2-5
screw sizes for installation, 2-4–2-6
expansion module, 2-8
memory cartridge, 5-22
screw sizes for installation, 2-4–2-6
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Index
Removing, terminal block connector, 2-12
Repeater, order number, E-2
Repeaters, PROFIBUS network, 7-34
Reset Dominant Bistable instruction, 10-6
Reset Immediate instruction, 9-8
Reset instruction, 9-7, 10-4
Resistor/capacitor networks, relay applications,
2-17
Resources dialog box for Windows NT, 7-8
Restarting the CPU, after a fatal error, 4-37
Retaining memory, 5-15–5-20
Retentive ranges of memory, defining, 5-19
Return from Interrupt Routine instruction,
9-167
Return from Subroutine instruction, 9-145
Rotate instructions
example of shift and rotate, 9-122–9-124,
10-31–10-33
Rotate Left Byte, 9-119
Rotate Left Double Word, 9-121
Rotate Left Word, 9-120
Rotate Left, 10-30
Rotate Right, 10-30
Rotate Right Byte, 9-119
Rotate Right Double Word, 9-121
Rotate Right Word, 9-120
Rotate Left Byte instruction, 9-119
Rotate Left Double Word instruction, 9-121
Rotate Left instruction, 10-30
Rotate Left Word instruction, 9-120
Rotate Right Double Word instruction, 9-121
Rotate Right instruction, 10-30
Rotate Right Word instruction, 9-120
Round instruction, 9-127
RUN mode, 4-25
Run-time errors, B-3
system response, 4-38
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
S
S7-200
components, 1-4
CPU modules, removal procedure, 2-8
CPU summary, 1-3
dimensions
CPU 221, 2-4
CPU 222, 2-4
CPU 224, 2-5
expansion I/O modules, 2-5
screw sizes for installation, 2-4–2-6
electromagnetic compatibility, A-4
environmental conditions, A-3
expansion modules, 1-4
removal procedure, 2-8
installation procedure, panel, 2-6
screw sizes for installation, 2-4–2-6
system components, 1-2
technical specifications, A-3
S7-200 CPU
memory ranges, 8-7
operand ranges, 8-8
Safety circuits, designing, 4-3
Saving
program permanently, 5-20
value to EEPROM, C-7
Scaling loop outputs, 9-90
Scan cycle
and force function, 4-34
and Status/Force Chart, 4-34
interrupting, 4-24
status bits, C-1
tasks, 4-22
Scan time, SMW22 to SMW26), C-6
Screw sizes (for installation), 2-4–2-6
Segment instruction (Conversion instructions),
9-133
Segmentation instructions (SCR instructions),
9-154
Segments, network, 7-28
Sequence Control Relay instructions, 9-153
examples, 9-155–9-159
Sequence control relays
addressing memory area, 5-5
CPU 221/222/224, 8-7
Set Dominant Bistable instruction, 10-6
Set instruction, 10-4
Set Real-Time Clock instruction, 9-70
Setpoint, converting, 9-89
Setting the PG/PC interface dialog box, 7-6
Index-17
Index
Setting up
communications, 7-2–7-19
communications parameters, 7-4
Shift instructions
example of shift and rotate, 9-122–9-124,
10-31–10-33
example of shift register bit, 9-125–9-127
Shift Left, 10-29
Shift Left Byte, 9-116
Shift Left Double Word, 9-118
Shift Left Word, 9-117
Shift Register Bit, 9-123
Shift Right, 10-29
Shift Right Byte, 9-116
Shift Right Double Word, 9-118
Shift Right Word, 9-117
Shift Left Byte instruction, 9-116
Shift Left Double Word instruction, 9-118
Shift Left instruction, 10-29
Shift Left Word instruction, 9-117
Shift register, 9-124
Shift Register Bit (SHRB), 9-124
Shift Register Bit (SHRB) box, 9-124
Shift Register Bit instruction, 9-123
Shift Right Byte instruction, 9-116
Shift Right Double Word instruction, 9-118
Shift Right instruction, 10-29
Shift Right Word instruction, 9-117
SIMATIC instruction set, 4-10
Single-phase wiring guidelines, 2-13
Size of the modules
CPU 221, 2-4
CPU 222, 2-4
CPU 224, 2-5
expansion I/O modules, 2-5
screw sizes for installation, 2-4–2-6
SM0.2 retentive data lost memory bit, 5-18
SMB0 status bits, C-1
SMB1 status bits, C-2
SMB166 - SMB194: PTO, PT1 Profile
Definition Table, C-16
SMB186-SMB194 receive message control,
C-12
SMB2 freeport receive character, C-2
character interrupt control, 9-188
SMB28, SMB29 analog adjustment, 6-13, C-6
SMB3 freeport parity error, C-2
character interrupt control, 9-188
SMB30 - SMB165: HSC Register, C-15
Index-18
SMB30, SMB130 freeport control registers,
9-184, C-6
SMB34/SMB35 time-interval registers, C-8
SMB36-SMB65 HSC register, C-9
SMB4 queue overflow, C-3
SMB5 I/O status, C-3
SMB6 CPU ID register, C-4
SMB66-SMB85 PTO/PWM registers, C-11
SMB7 reserved, C-4
SMB8-SMB21 I/O module ID and error
registers, C-5
SMB86-SMB94 receive message control, C-12
SMB98 and SMB99, C-14
SMW22-SMW26 scan times, C-6
Special memory bits, C-1–C-13
addressing, 5-5
SMB0 status bits, C-1
SMB1 status bits, C-2
SMB166 - 194: PTO, PT1 Profile Definition
Table, C-16
SMB186-SMB194 receive message control,
C-12
SMB2 freeport receive character, C-2
SMB28, SMB29 analog adjustment, C-6
SMB3 freeport parity error, C-2
SMB30 - 165: HSC Register, C-15
SMB30, SMB130 freeport control registers,
9-184, C-6
SMB31 permanent memory (EEPROM)
write control, C-7
SMB34/SMB35 time interval registers, C-8
SMB36-SMB65 HSC register, C-9
SMB4 queue overflow, C-3
SMB5 I/O status, C-3
SMB6 CPU ID register, C-4
SMB66-SMB85 PTO/PWM registers, C-11
SMB7 reserved, C-4
SMB8-SMB21 I/O module ID and error
registers, C-5
SMB86-SMB94 receive message control,
C-12
SMB98 and SMB99, C-14
SMW222-SMW26 scan times, C-6
SMW32 permanent memory (EEPROM)
write control, C-7
Specifications
creating functional, 4-3
S7-200 family, A-3
Square Root instruction, 9-98, 10-22
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Index
Standard contact instructions, 9-2, 10-2
Standard rail
clearance requirements, 2-3–2-5
dimensions, 2-4
high-vibration installations, 2-7
installation procedure, 2-7
removal procedure, 2-8
using DIN rail stops, 2-7
vertical installations, 2-7
Standards, national and international, A-2
Statement list, 4-6
Statement List Editor, 4-6
Status bits (SMB0), C-1
Status byte, High-Speed Counter, 9-39
Status/Force Chart
and scan cycle, 4-34
modifying program, 4-31
STEP 7-Micro/WIN 32, iv
equipment requirements, 3-2
hardware for network communications, 3-2,
7-3
installing communications hardware,
3-2–3-4
modem communications, 7-25–7-30
online help, 3-2
order number, E-1
setting up communications within, 7-5
upgrade order number, E-1
STL instructions
execution times, F-1
quick reference, G-5
Stop instruction, 9-141
STOP mode, 4-25
Subroutine
adding to program, 9-145
example, 4-18
guidelines, 4-18
with parameters, 9-146
Subtract Double Integer instruction, 9-73
Subtract instruction, 10-19
Subtract Integer instruction, 9-72
Subtract Real instruction, 9-81
Summary of S7-200 CPU, features, 1-3
Super capacitor, 5-15
Suppression circuits, guidelines
AC output, 2-17
DC relay, 2-17
DC transistor, 2-16
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Swap Bytes instruction, 9-102
Symbolic names, creating, 4-4
Synchronous updates, PWM function, 9-59
System design, Micro PLC, 4-2
T
Table Find instruction, 9-106
Table instructions, 9-104–9-109
Add to Table, 9-104
First-In-First-Out, 9-108
Last-In-First-Out, 9-109
Table Find, 9-106
TD 200 Operator Interface User Manual, iv
TD200, order number, E-2
Technical assistance, requesting, v
TERM mode, 4-25
Terminal block connector
CPU 224, 2-12
expansion module, 2-12
removing, 2-12
Terminating, network, 7-32
Time-based interrupts, 9-171
Time, setting, 9-70
Timed interrupt
example, 4-18, 9-175
SMB34, SMB35, C-8
Timer instructions
example of on-delay timer, 9-20, 9-21,
10-13, 10-14
example of retentive on-delay timer, 9-22
Off-Delay Timer, 9-15, 10-12
On-Delay Timer, 9-15, 10-11
On-Delay Timer Retentive, 9-15
Pulse Timer, 10-12
Timer T32/T96, interrupts, 9-171
Timers
addressing memory area, 5-7
CPU 221/222/224, 8-7
number, 10-11, 10-12
operation, 10-11, 10-12
resolution, 10-11, 10-12
Timing diagrams, high speed counters, 9-28
Token rotation, and network performance, 7-42
Token rotation comparison, 7-45
Token rotation time, 7-44–7-47
Index-19
Index
Transmit instruction, 9-182, 9-184
example, 9-189
Troubleshooting
compile errors, B-4
error handling, 4-36
fatal errors, 4-37, B-2
Micro/WIN 32 installation, 3-4
network read/network write errors, 9-176
non-fatal errors, 4-38
password lost, 4-29
PID loop, 9-93
run-time programming errors, B-3
S7-200, D-1
Truncate instruction, 9-127, 10-32
U
Uploading, program, 5-15
User-defined protocol, Freeport mode of
communication, 7-30
Using pointers, 5-13
& and *, 5-13
modifying a pointer, 5-14
Using subroutines, 9-145
V
V memory, copying using EEPROM, 5-20
Valid ranges for CPUs, 8-7
Variable memory area, addressing, 5-5
Variables, forcing, 4-34
VDE 0160, A-2
Vibration potential on installation, using DIN rail
stops, 2-7
Index-20
W
Watchdog Reset instruction, 9-142–9-144
Watchdog Timer instruction, considerations,
9-142
Windows NT, installing hardware, 7-8
Wiring
guidelines, 2-9–2-14
AC installation, 2-13
DC installation, 2-14
inputs, High-Speed Counters, 9-32
optional field wiring connector, 2-11
removing modules, 2-8
suppression circuits, 2-16–2-17
Wiring diagram
CPU 221 AC/DC/Relay, A-10
CPU 221 DC/DC/DC, A-10
CPU 222 AC/DC/Relay, A-15
CPU 222 DC/DC/DC, A-15
CPU 224 AC/DC/Relay, A-20
CPU 224 DC/DC/DC, A-20
EM221 Digital Input 8 x 24VDC, A-22
EM222 Digital Output 8 x 24 VDC, A-24
EM222 Digital Output 8 x Relay, A-24
EM223 Digital Combination 8 x 24 VDC/8 x
Relay, A-27
EM223 Digital Combination 8In/8Out, A-27
Word, and integer range, 5-4
Word access, 5-2
CPU 221/222/224, 8-8
using pointer, 5-14
Write control, C-7
S7-200 Programmable Controller System Manual
C79000-G7076-C233-01
Siemens AG
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S7-200 Programmable Controller System Manual
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S7-200 Programmable Controller System Manual
6ES7298-8FA20-8BH0-01