SIEMENS
SIEMENS
Foreword, Contents
Part 1: Field Engineering Package
Introduction
1
Components of the field engineering
package
2
SIMATIC
Description of the optional components
3
FIELD ENGINEERING
PACKAGE
System Overview
Catalog data
4
Part 2: Configuring and
startup
Installation guidelines
5
Hardware configuring (example)
6
Software configuring (example)
7
Appendices
SIMATIC Field Engineering Package
References
A
Index
B
Glossary
C
20.07.98 20Handbuch_pa.doc
Safety
This manual contains instructions to be observed for your personal
instructions
safety and to avoid damage. The instructions are emphasized with a warning
triangle and take the following form, according to the degree of danger:
Danger
This means that failure to observe the appropriate precautions will result in death,
serious injury or considerable damage.
Warning
This means that failure to observe the appropriate precautions can result in death,
serious injury or considerable damage.
Caution
This means that failure to observe the appropriate precautions can result in slight injury
or damage.
Note
This is important information relating to the product, handling of the product or the part
of the documentation to which particular attention must be paid.
Qualified
personnel
Startup and operation of equipment may only be carried out by qualified
personnel. In the context of the safety instructions of the manual, qualified
personnel are persons authorized to place the equipment, systems and circuits in
operation according to the safety standards, to ground them and mark them.
Normal use
Observe the following:
Warning
These products may only be used for the applications intended in the catalog and in the
technical description, and only in association with non-Siemens devices and
components recommended or approved by Siemens.
Perfect and reliable operation of the product requires proper transportation and storage,
setting up and installation as well as careful operation and maintenance.
Trademarks
SIMATIC ,SITRANS, PDM and SINEC are registered trademarks of
SIEMENS AG.
Other designations in this publication may be trademarks whose utilization by third
parties for their own purposes may infringe the holders’ rights.
SIMATIC Field Engineering Package
01.98
SIMATIC Field Engineering Package
0 Introduction
Introduction
01.98
Contents
Part 1 The field engineering package
1
INTRODUCTION
1—1
1.1
Positioning of the field engineering package in the SIMATIC systems
1—2
1.2
PROFIBUS as the universal field bus
1—7
1.2.1 PROFIBUS-DP
1—7
1.2.2 PROFIBUS-PA
1—8
1.3
1—9
PROFIBUS components
1.3.1 Transition from PROFIBUS-DP to PROFIBUS-PA
2
3
4
1–2
1—9
1.3.2 PROFIBUS-PA configuration with SIMATIC S5
1—11
1.3.3 PROFIBUS-PA configuration with SIMATIC S7
1—11
1.4
1—12
HART functions
OVERVIEW OF THE COMPONENTS OF THE FIELD ENGINEERING PACKAGE
2–1
2.1
Introduction
2–2
2.2
Hardware components
2–2
2.2.1 PROFIBUS-PA
2–2
2.2.2 HART
2–3
2.3
2–5
Configuring the field engineering
COMPONENTS OF THE FIELD ENGINEERING PACKAGE IN DETAIL
3–1
3.1
3–2
Hardware
3.1.1 DP/PA coupler
3–2
3.1.2 DP/PA link
3–3
3.1.3 HART modules
3–4
3.1.3.1 Two-channel analog input module
3–4
3.2
3–6
Software/configuration
3.2.1 Configuration/project scope
3–6
3.2.2 Addressing of PROFIBUS-PA field devices
3–7
3.2.3 Parameter assignment / device profiles
3–9
3.2.4 Device database (GSD) and device descriptions (DD)
3–12
3.2.5 Driver function blocks for the field engineering package
3–13
CATALOG DATA
4–2
4.1
Ordering data for the field engineering package
4–3
4.2
Cross-references to detailed catalogs
4–3
4.3
Positioning in the information environment
4–4
SIMATIC Field Engineering Package
01.98
0 Introduction
Part 2 Configuring and startup
5 INSTALLATION GUIDELINES
5–1
5.1 Introduction
5–2
5.2 Mechanical and electrical installation
5–6
5.2.1 Installing the cables
5–6
5.2.2 Cable routes within and outside buildings
5–6
5.2.3 Cable specifications and cable recommendation for PROFIBUS-DP
5–8
5.2.4 Cable specifications and cable recommendation for PROFIBUS-PA
5–9
5.2.5 Shielding concept
5–11
5.2.6 Grounding and equipotential bonding
5–13
5.2.7 Lightning protection
5–13
5.2.8 Connectors
5–14
5.2.9 Installation materials and tools
5–15
5.3 Guidelines of the PNO (PROFIBUS Users' Organization)
5–16
6 HARDWARE CONFIGURING (PROJECT EXAMPLE)
6–1
6.1 Configuring a station
6–3
6.1.1 Creating a station and starting the hardware configuration
6–4
6.1.2 Configuring the station
6–5
6.1.3 Loading the hardware configuration into a CPU
6–7
6.2 PROFIBUS-DP distributed I/O
6–8
6.2.1 Inserting a DP slave in a station
6–8
6.2.1.1 Device database (GSD files)
6–8
6.2.1.2 Using a SITRANS P via a DP/PA coupler
6–9
6.2.1.3 Using an ET 200M with a HART module
6–10
6.3 Station diagnostics
6–11
6.4 SITRANS P parameter assignment with SIMATIC PDM
6–12
7 SOFTWARE CONFIGURING (PROJECT EXAMPLE)
7–2
7.1 Project example: Control loop (CFC)
7–3
7.2 Project example: Sequential control system with two-step control (SFC)
7–6
SIMATIC Field Engineering Package
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01.98
1 Introduction
Introduction
1
This chapter contains:
1.1 Positioning of the field engineering package in the SIMATIC systems
1-2
1.2 PROFIBUS as the universal field bus
1-7
1.2.1 PROFIBUS-DP
1-7
1.2.2 PROFIBUS-PA
1-8
1.3 PROFIBUS components
1-9
1.3.1 Transition from PROFIBUS-DP to PROFIBUS-PA
1-9
1.3.2 PROFIBUS-PA configuration with SIMATIC S5
1-11
1.3.3 PROFIBUS-PA configuration with SIMATIC S7
1-11
1.4 HART functions
1-12
SIMATIC Field Engineering Package
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1 Introduction
1.1
01.98
Positioning of the field engineering package in the
SIMATIC systems
General
The new field engineering is designed for use in the SIMATIC S5,
SIMATIC S7 and SIMATIC PCS 7 systems. The PCS 7 system is given
priority in this overview because the entire performance range of the field bus
components can be used conveniently in PCS 7.
SIMATIC PCS 7 is the new Siemens process control system for the automation
of industrial and production processes.
Shown in Table 1-2 are the possible applications of the individual components.
Components
The SIMATIC family comprises the following SIMATIC main components:
Hardware and
software
requirements
•
SIMATIC S5, S7 and PCS 7 automation systems
•
SIMATIC HMI - the human-machine interface systems: (such as operator
stations and operator terminals based on WinCC)
•
SIMATIC NET - the communications basis consisting of PROFIBUS and
Industrial Ethernet
•
SIMATIC NET DP - the PROFIBUS-DP field bus system for distributed
I/O and PROFIBUS-DP compatible field devices
•
SIMATIC PA - the PROFIBUS-PA field bus system as an extension of the
PROFIBUS-DP field bus system to include the optimized transmission
system for applications in the intrinsically safe and non-intrinsically safe
areas
•
SIMATIC Industrial Software (e.g. engineering system with STEP 7 and
SIMATIC Manager for SIMATIC S7 and PCS 7)
At least the following releases must be available in order to use the
field engineering package:
Unit/software package
Software release
SIMATIC Step 7
SIMATIC WinCC
COM PROFIBUS
SIMATIC PC S7
from V 4.02
from V 4.02
from V 3.1
from V 4.02
Table 1-1: Basic requirements for the field engineering package
Conformity
1—2
Activities serving the interaction of components in the overall SIMATIC
system are presented in various conformity classes. They offer different
degrees of convenience and functionality in configuring and operation.
The control system functionality of the PCS 7 system with its special controlrelated activities and tools for selected components offers a maximum of
system performance and convenience for the user. This is shown in
Table 1-2:
SIMATIC Field Engineering Package
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1 Introduction
SIMATIC
Base
SIMATIC
S5
SIMATIC
S7
SIMATIC
PCS 7
I/O area
Components of
option package
COM PROFIBUS
Drivers
HW-Config
SIMATIC PDM
HART
DP/PA LINK
DP/PA COUPLER
Continuous
processes
Discontinuous
processes
X
X
-
(X)
X
X
(X)
X
X
X
X
X
X
X
X
X
X
-
X
X
Part 1
Manual
Part 2
Manual
(X) Restricted performance level (no standard software components)
Table 1-2: Possible applications of the individual field bus components
Positioning in
the system
The field engineering package is positioned at the lowest level of the
automation systems.
•
PROFIBUS-PA forms the communications channel between control level,
automation system and field device over great distances with minimum
overhead.
•
HART modules provide the information channel for the HART protocol
between control level and field devices with HART protocol.
•
SIMATIC PDM is a convenient configuring and parameter assignment
system for field devices with PROFIBUS-PA connection or the HART
protocol.
Shown in Figs 1-1 to 1-4 is the positioning in an automation system as an
example.
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1 Introduction
01.98
SIMATIC S7-400
CPU 414-2, 416-2
PROFIBUS-DP, up to 12 Mbit/s
ET 200 M
ET 200 M
DP/AS-i
link
24 V
DP/PA coupler,
DP/PA link
4-20 mA
+ HART
4-20 mA
PROFIBUS-PA
Actuator/sensor interface
Fig. 1-1 Positioning of the new field device systems in the I/Os of the
SIMATIC automation system
OS
ES
SIPROM
System Bus
SIMATIC S7-400
PROFIBUS-DP
up to 12 MBit/s
ET 200 M
DP/PA LINK
PROFIBUS-PA
31.25 kbit/s
0/4 ... 20 mA
+ HART
Fig. 1-2 Positioning of the PROFIBUS-PA field bus system and HART I/O
modules in the SIMATIC S7/PCS 7 automation system
1—4
SIMATIC Field Engineering Package
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1 Introduction
PC/PG
COROS
SIPROM
System Bus
SIMATIC S5 - 155U
SIPROM
PROFIBUS-DP
45,45 kbit/s
Programmer with
COM Profibus
ET 200 M
DP/PA COUPLER
PROFIBUS-PA
Fig. 1-3 Positioning of the PROFIBUS-PA field bus system in the
SIMATIC S5 system
PROFIBUS
PROFIBUS is a multi-master bus system. PROFIBUS is the system bus
intended for SIMATIC PCS 7 in medium-sized to large installations with high
performance requirements.
Up to 126 stations can be connected to a PROFIBUS. It can operate at
transmission rates of 9.6 kbit/s to 12 Mbit/s and can have a network size of up
to 21,730 m at 1.5 Mbit/s.
PROFIBUS-DP
The exchange of data between automation system and distributed I/O as
well as intelligent field devices is nowadays carried out via field bus systems
with low installation overhead. The standardized PROFIBUS-DP is used for
SIMATIC S5, S7, PCS 7. PROFIBUS-DP is a MASTER/SLAVE bus system.
The master function is performed by an automation system (master class 1) or
by one or more personal computers (master class 2). The automation system
(master class 1) has full access via cyclic messages to all stations assigned to it.
By means of the personal computer (master class 2), data can be exchanged as
required with all connected stations via acyclic messages. For example the
ET 200 M distributed I/O and individual field devices are connected via
PROFIBUS-DP. Depending on the standard, up to 126 stations can also be
connected to a PROFIBUS-DP. PROFIBUS can operate at transmission rates
of 9.6 kbit/s to 12 Mbit/s and can have a network size of up to 21,730 m (at
1.5 Mbit/s).
PROFIBUS-PA
PROFIBUS-PA is the extension of PROFIBUS-DP to include the optimized
transmission system for field devices whilst retaining the communications
function of PROFIBUS-DP. With the selected transmission system, field
devices, even in hazardous areas, can be connected to the automation system
over great distances and powered via PROFIBUS-PA. PROFIBUS-PA is the
communications-compatible extension of PROFIBUS-DP.
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1—5
1 Introduction
01.98
PROFIBUS-PA
=
PROFIBUS-DP communications
+
optimized transmission system for field devices
(IEC 1188-2)
The HART
input module
1—6
HART (highway addressable remote transducer) is a serial transmission
method with which additional data such as measuring range, attenuation, etc.
can be transmitted to connected sensors or actuators via a 4 to 20 mA current
loop. In the course of time, HART has developed into a vendor-independent
(quasi-) standard.
Utilization of the HART protocol becomes possible with the two HART analog
modules available from SIEMENS. This extends considerably beyond the
facility for incorporating a handheld terminal in the current loop.
SIMATIC Field Engineering Package
01.98
1.2
1 Introduction
PROFIBUS as the universal field bus
General
PROFIBUS (Process Field Bus) is a bus system standardized according to
European standard EN 50170, Volume 2; it has been used successfully for
several years in manufacturing and process automation (chemicals and process
engineering). The following subtopics describe, apart from the technical
characteristics of PROFIBUS-PA, the integrating function of PROFIBUS-PA
in the automation of chemical processes and process engineering. PROFIBUSPA is a communications-compatible extension of PROFIBUS-DP into the
field. With the chosen transmission system ("bus physics"), transducers and
actuators, even in the hazardous area, can communicate over great distances
with the central programmable controller / system and can be powered by it.
References /505/ to /518/ can be consulted for further information.
1.2.1 PROFIBUS-DP
Introduction
PROFIBUS-DP is the most widespread field bus system in Europe. The
technical characteristics of PROFIBUS-DP allow operation in almost all areas
of industrial automation. Notable features are, in addition to the simple
installation (two-wire line), the extremely high transmission rate (up to
12 Mbit/s), the versatile network configurations (linear, star, ring) and optional
redundancy with a fiber-optic double ring. PROFIBUS-DP is a master/slave
bus system with which the master function is assumed by a programmable
controller/system (master class 1) or a personal computer (master class 2).
Master class 1, in which the automation functions (closed-loop and open-loop
control) also take place, has full access to the field devices via cyclic and
acyclic messages. Master class 2 can, if required, exchange data via acyclic
messages with master class 1 (upload/download, master diagnostic read) and
exchange data with the field devices (measured value read, slave diagnostic
read, parameter write).
Technical specifications:
•
Transmission system: RS 485
•
Topology: linear, star, ring
•
Medium: two-wire twisted pair cable, fiber-optics option
•
Number of stations: 126 max. (32 max. per segment)
•
Number of segments: 10 max.
•
Network size: 2,000 m max. (optical: 21,730 m max.) at 1.5 Mbit/s
•
Transmission rate: 12 Mbit/s max.
•
Redundancy: with optical link modules (OLMs) and fiber-optic double
ring
Modern field devices such as transducers, actuators and drives have, in
addition to the measured value or manipulated variable, many parameters
SIMATIC Field Engineering Package
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1 Introduction
01.98
which must be changed during startup and, to some extent also during
operation in order to utilize the "intelligence" of these field devices such as
preventive maintenance or optimization of the interface to the sensor. On
account of the different time-related demands for data access of the master,
PROFIBUS-DP offers cyclic and acyclic services.
All output values (control commands) are written to the field devices and all
input values (measured values) are read out of the field devices in one cycle.
Subsequently, an acyclic data interchange can take place with a particular field
device. Settings of the field devices can be read or parameters can be modified.
With the facility for supplementing each transmission cycle with precisely one
single acyclic message, short, deterministic cycle times are ensured as the basis
for software control in the programmable controller/system.
1.2.2 PROFIBUS-PA
Introduction
PROFIBUS-PA is the extension of PROFIBUS-DP to include the optimized
transmission system for field devices (for example, for powering the field
devices via the data cable and utilization in a hazardous environment) whilst
retaining the communications functions of PROFIBUS-DP. This means that
with PROFIBUS-PA a variant of PROFIBUS-DP has been defined which
allows the operation of PROFIBUS in the intrinsically safe area also, whilst
system integration with PROFIBUS-DP is ensured. This has been achieved by
adopting the PROFIBUS-DP protocol for PROFIBUS-PA.
The choice of the internationally standardized transmission system to IEC
1158-2 (International Electrotechnical Commission) ensures the future-oriented
field installation with PROFIBUS-PA.
The advantages of the field bus system can now also be used in process
engineering with the PROFIBUS-PA bus system. PROFIBUS-PA is more than
a two-wire line connecting the field devices (transducers and actuators).
Highlighted in the following subtopics, apart from the technical characteristics
of PROFIBUS-PA, is the integrating function of PROFIBUS–PA in the
automation of chemical processes and process engineering.
PROFIBUS-PA meets the requirements of the process-engineering industry:
•
Networking of transducers, valves, actuators via a serial bus system
(two-wire line),
•
for use in process engineering,
•
with field device powering via the data cable, as well as
•
for applications in the hazardous area ("intrinsically safe" type of
protection EEx[i] )
Signal conversion
Conversion of the PROFIBUS-DP transmission system from RS 485 (bit
coding with asynchronous NRZ code) to IEC 1158-2 (bit coding with
synchronous Manchester code) for PROFIBUS-PA takes place via the "DP/PA
coupler" or "DP/PA link" described in Chapter 3 ff..
Area of application
PROFIBUS-PA is designed for operation in the intrinsically safe and nonintrinsically safe areas.
1—8
SIMATIC Field Engineering Package
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1.3
1 Introduction
PROFIBUS components
1.3.1 Transition from PROFIBUS-DP to PROFIBUS-PA
Two network components, DP/PA coupler and DP/PA link, are available for
the transition of the transmission system from PROFIBUS-DP (RS 485) to
PROFIBUS-PA (IEC 1158-2). Their use is governed by the automation
requirements.
DP/PA coupler
The DP/PA coupler has the following tasks:
•
Conversion of the data format from asynchronous (11 bits/character) to
synchronous (8 bits/character) and, associated with this, conversion of the
transmission rate from 45.45 kbit/s to 31.25 kbit/s. The DP/PA coupler
"acts as a wire"; it is not configured and cannot be detected by the stations.
•
Powering of the field devices
•
Limiting of the supply current by barriers (for flameproof applications)
Two variants of the DP/PA coupler are available: A non-flameproof variant
with supply for up to 31 field devices, and a certified flameproof variant with
supply for up to 10 field devices for operation in zones 1 and 2.
Note:
The maximum usable number of field devices is governed by the current
consumption of the individual field devices.
DP/PA link
The DP/PA link comprises up to 5 DP/PA couplers (flameproof variant)
or 5 DP/PA couplers (non-flameproof variant) connected via a headend module
as a station to PROFIBUS-DP. The headend module is a slave on the higherlevel PROFIBUS-DP (12 Mbit/s max.) and a master for the subordinate PA
lines. Together, these PA lines form a logical bus. The total of all field devices
on a DP/PA link is limited to 31 on account of the message length. This
restriction applies irrespective of the DP/PA coupler variant in use.
The DP/PA link is employed in the case of high demands for cycle time and
large project scopes.
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1 Introduction
01.98
PROFIBUS-DP
up to 12 MBit/s
PROFIBUS-DP
45.45 kbit/s
DP/PA link
DP/PA
coupler
24 V
24 V
(modular expansion,
central module with
a max. of 5 couplers)
24 V
J
J
J
J
PROFIBUS-PA
31.25 kbit/s
Non-Ex version:
I < 400 mA,
max. 30 field devices
PROFIBUS-PA
31.25 kbit/s
Ex version:
I < 100 mA
max. 10 field devices
Non-Ex:
Ex:
max. 31 field devices per DP/PA link
max. 31 field devices per DP/PA link
Fig. 1-4 Network components: DP/PA coupler and link module for
PROFIBUS-DP/PA
Potential
savings
The comparison between conventional, that is, parallel cabling of the field
devices and the PROFIBUS-PA field bus system highlights the enormous
potential savings in configuring, hardware overhead, installation and plant
documentation.
Switchroom
Switchroom
PROFIBUS-DP
Terminal blocks
24 V
24 V
Separation EExi,
power supply
Terminal block
Distr.
Distributor
Distr.
PROFIBUS-PA
Fig. 1-5 Block diagram: Comparison between parallel cabling and serial
cabling (field bus)
The cost savings when using PROFIBUS-PA result primarily from the
discarding of jumpering panels, supply isolators and field distributors as well
as reduced space requirement in the switchroom. Consequently, the costs of
documentation and testing of field cabling with PROFIBUS-PA are reduced to
a minimum ("a few two-wire lines").
Clearly, field bus structures with PROFIBUS-PA have considerably lower fault
potential than conventional cabling. If, however, a fault occurs, it can be very
quickly located and corrected on account of the simple structure.
1—10
SIMATIC Field Engineering Package
01.98
1 Introduction
1.3.2 PROFIBUS-PA configuration with SIMATIC S5
Components
In the SIMATIC S5 control system, the DP/PA coupler is exclusively
used in conjunction with the IM 308 - C DP master card (from release 7).
Owing to the relatively low data rate on PROFIBUS-DP (45.45 kbit/s) the
project scope is governed either by the maximum number of addressable slaves
(field devices) or the maximum cycle time.
The following should be observed for operation in SIMATIC S5 (for example,
SIMATIC S5-155U PLC with CPU 948):
•
The exchange of data with each field device lasts approximately 10 ms
(outgoing and return message).
•
Thus the cycle time on a DP line with 10 field devices is about
10 x 10 ms = 100 ms, i.e. the measured values can be read into the CPU or
the manipulated variables can be read out 10 times per second.
•
The cycle time with 30 field devices per DP line is about 300 ms.
•
Up to 7 DP lines for field bus applications can be plugged into one
SIMATIC S5-155U PLC.
1.3.3 PROFIBUS-PA configuration with SIMATIC S7
In conjunction with SIMATIC S7 and the SIMATIC PCS 7 control system, the
DP/PA coupler is used for smaller project scopes or low time-related demands,
and the DP/PA link for large project scopes and high time-related demands.
The DP/PA link allows a configuration with a subordinate PA lines with short
cycle times (approximately 100 ms for 10 field devices). These data are
transferred to the SIMATIC PCS 7 control system via PROFIBUS-DP at up to
12 Mbit/s without significant loss of time (approximately 1 ms).
Control system
45.45 kbit/s
SIMATIC PCS 7
up to 12 Mbit/s
DP/PA
coupler
DP/PA link
45.45 kbit/s
SIMATIC S5
DP/PA
coupler
Quantity framework
Fig. 1-6 Applications of the DP/PA coupler and link module for
PROFIBUS-DP/PA
SIMATIC Field Engineering Package
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1 Introduction
1.4
01.98
HART functions
Introduction
HART (highway addressable remote transducer) is a serial transmission
method with which additional data can be transferred via a 4 to 20 mA current
loop. The HART protocol describes the physical form of the transmission,
transaction procedures, message structure, data formats and many commands.
Furthermore, HART users can define their own commands.
HART signal
The HART signal is a digital communication modulated onto the normal
analog signal. Sine waves of 1200 Hz and 2200 Hz represent the HART signal
and are modulated onto the analog signal (4-20 mA). Since the signal has a
mean value of 0, the analog signal is not affected. The HART signal can be
easily filtered out with a filter, and the original analog signal is then available
again. The HART signal can be additionally evaluated:
Application criteria/
characteristics
•
HART signal with a frequency of 2200 Hz signifies a logic "0".
•
HART signal with a frequency of 1200 Hz signifies a logic "1".
•
The signal sequences are transferred alternately as the command (C) and
response (R).
HART modules are characterized by the following application criteria and
characteristics:
•
HART has developed into a quasi-standard since the 1980s.
•
Several million HART devices are in operation worldwide.
•
They are pin-compatible with conventional analog modules.
•
Additional communication facilities via the current loop.
•
The low power requirement with HART favors its application in the
hazardous area.
The utilization of HART in the ET200 M distributed I/O system is possible
with HART analog modules.
1—12
SIMATIC Field Engineering Package
01.98
2 Overview of the components of the field engineering package
Overview of the components of the field
engineering package
2
This chapter contains:
2.1 Introduction
2–2
2.2 Hardware components
2–2
2.2.1 PROFIBUS-PA
2–2
2.2.2 HART
2–3
2.3 Configuring the field engineering
2–5
SIMATIC Field Engineering Package
2–1
2 Overview of the components of the field engineering package
2.1
01.98
Introduction
This chapter provides you with an overview of the components of the field
engineering package. Detailed descriptions of the individual components can
be found in the corresponding manuals which are referred to at the appropriate
points. These are as follows:
Hardware:
•
PROFIBUS-DP/PA coupler
•
PROFIBUS-DP/PA link
•
Analog input module SM 331; AI 2 x HART
Software:
2.2
•
Step 7 (HW-Config)
•
PCS 7 driver/CFC
•
SIMATIC PDM field device parameter assignment tool
•
COM PROFIBUS
Hardware components
2.2.1 PROFIBUS-PA
Applications
DP/PA bus communication can be used in SIMATIC S5 , S7 and PCS 7.
You can connect all field devices certified for PROFIBUS-PA.
DP/PA coupler
DP/PA coupler is available in the following variants:
•
DP/PA coupler EEx [i]: 6ES7 157-0AD00-0XA0
•
DP/PA coupler:
6ES7 157-0AC00-0XA0
The DP/PA coupler has the following features:
2–2
•
Type of protection [EEx ia] II C (only 6ES7 157-0AD00-0XA0)
•
Intrinsic safety (only 6ES7 157-0AD00-0XA0)
•
Isolation between PROFIBUS-DP and PROFIBUS-PA
•
Diagnostics via LEDs
•
Baud rate on PROFIBUS-DP 45.45 kbit/s
•
Baud rate on PROFIBUS-PA 31.25 kbit/s
SIMATIC Field Engineering Package
01.98
2 Overview of the components of the field engineering package
Detailed information can be found in /502/.
DP/PA link
The DP/PA link is available in the following variants:
•
DP/PA link interface module IM 157 (6ES7 157-0AA00-0XA0) with:
−
DP/PA coupler EEx [i]: 6ES7 157-0AD00-0XA0
−
DP/PA coupler: 6ES7 157-0AC00-0XA0
The DP/PA link is formed from the IM 157 interface module and one or
more DP/PA couplers (flameproof or non-flameproof variants). All
components of the DP/PA link are interconnected via S7-300 standard bus
connectors.
The DP/PA link has the following features:
•
Type of protection [EEx ia] II C (only with 6ES7 157-0AD00-0XA0)
•
Intrinsic safety (only with 6ES7 157-0AD00-0XA0)
•
Isolation between PROFIBUS-DP and PROFIBUS-PA
•
Baud rate on PROFIBUS-DP 12 Mbit/s max.
•
Baud rate on PROFIBUS-PA 31.25 kbit/s
•
Diagnostics via LEDs
•
Max. number of DP/PA couplers per DP/PA link: 5
Detailed information can be found in /502/.
2.2.2 HART
Application
The HART analog modules are primarily intended for use in SIMATIC
S7 and PCS 7. You can connect all field devices certified for digital
communications with the HART protocol. However, you can also connect field
devices with "conventional" 0/4-20 mA systems without the HART protocol.
The modules are designed for the S7-300 modular packaging system. With
PCS 7, the HART modules operate within the ET 200M distributed I/Os.
Detailed information on the ET 200M distributed I/O device can be found in
/140/.
Analog input
module
Analog input module SM 331;AI 2 x HART(6ES7 331-7TB00-0AB0)
has the following characteristics:
•
Inputs in 2 channel groups
•
Adjustable measured value resolution per channel (depending on the set
integration time)
•
Deactivation facility for measurement mode selection of the channels
−
Two-wire connection for transducers
−
Four-wire connection for transducers
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2 Overview of the components of the field engineering package
−
•
01.98
Channels can be deactivated
Current signal selectable per channel
−
0 to 20 mA (without HART function)
−
4 to 20 mA (with/without HART function)
•
Parameterizable diagnostics
•
Parameterizable diagnostic alarm
•
Two channels with limit monitoring
•
Parameterizable limit alarm
•
Channels isolated from each other
•
Open-circuit monitoring
•
Channels isolated from CPU and L+ load voltage
Detailed information can be found in /503/.
2–4
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2.3
2 Overview of the components of the field engineering package
Configuring the field engineering
Introduction
Extensive and convenient software tools are available for incorporating
the components of the field engineering package into the automation system.
Incorporation takes place according to standard rules, irrespectively of whether
it is a standard I/O module or an analog module +HART or a DP slave or PA
slave. The principle of incorporation is uniform. The capabilities of the new
components are described in more detail in the following sections.
COM PROFIBUS
The COM PROFIBUS program package is testing, diagnostic and parameterassignment software for PROFIBUS-DP (for example, the IM 308-C master
interface). With COM PROFIBUS, the ET200 system can be very easily
configured, documented and put into operation. You need COM PROFIBUS in
the SIMATIC S5 system for configuring the bus arrangement. Further details
and instructions can be found in /501/.
Field device blocks
Field device blocks are needed to transfer process data between the I/Os for
process data processing. These field device blocks provide the interface to the
hardware, including verification functionality.
Detailed information on parameter assignment for blocks can be found in
/258/, Chapter 5.
A detailed description of all field device blocks can be found in /260/.
The field device blocks currently available for process linking of the field
engineering package in the PCS 7 automation system can be found in
Section 3.2.5, Table 3-1.
Hardware
configuring
Hardware configuring within the STEP 7 program package of the S7/PCS 7
automation system is a convenient configuring tool for creating the hardware
structures within your projects. You can use it for configuring and assigning
parameters to modules of a centralized arrangement as well as of DP/PA
devices in a distributed arrangement.
"Configuring" is understood to mean:
•
The arrangement of racks, modules, interface modules and devices.
During configuring, the addresses in the I/O area of the S7-400 are
automatically assigned to the individual modules.
"Parameterization" is understood to mean:
•
The setting of parameters for parameterizable modules for the centralized
arrangement and for a network.
•
The setting of bus parameters, DP master and DP/PA slave parameters for
a PROFIBUS-DP or DP/PA network.
Detailed information can be found in /231/
SIMATIC PDM
A universally applicable configuring tool for service and parameter
assignment of field devices for the PROFIBUS-PA and HART analog module
packages. A prerequisite is a device description (DD) which can be read and
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2 Overview of the components of the field engineering package
01.98
interpreted by SIMATIC PDM (process device manager). SIMATIC PDM can
be operated in a centralized (for example via the ES station) or decentralized
arrangement (laptop at the IM 153-2 for HART modules or on PROFIBUSDP).
Direct operation via PROFIBUS-DP is available in the first stage of supply
(see Fig. 2-1).
OS
ES
SIPROM
System bus
DD
ES
DD for generating
manufacturer-neutral
parameterizing masks
in PDM for
(library in PDM)
GSD
SIPROM
SIMATIC S7-400
One-time
transfer to
Siemens
PROFIBUS-DP
up to 12 Mbit/s
PROFIBUS-PA
DP/PA-Link
GSD for
network configuring
the DP master
(S7-400 and
DP/PA link) with the
Engineering System
(for library in
HW config)
Fig. 2-1 Integration of any field devices in PROFIBUS-PA
2–6
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3 Components of the field engineering package in detail
Components of the field engineering package
in detail
3
This chapter contains:
3.1
Hardware
3–2
3.1.1 DP/PA coupler
3–2
3.1.2 DP/PA link
3–3
3.1.3 HART modules
3–4
3.1.3.1 Two-channel analog input module
3–4
3.2
3–6
Software/configuration
3.2.1 Configuration/project scope
3–6
3.2.2 Addressing of PROFIBUS-PA field devices
3–7
3.2.3 Parameter assignment / device profiles
3–9
3.2.4 Device database (GSD) and device descriptions (DD)
3–12
3.2.5 Driver function blocks for the field engineering package
3–13
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3 Components of the field engineering package in detail
3.1
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Hardware
3.1.1 DP/PA coupler
Variants
Two variants of the DP/PA coupler are available: A non-flameproof
variant with up to 400 mA output current for the PA cable, and a flameproof
variant with up to 100 mA output current. The PA cable of the flameproof
variant can be used in the hazardous area. The DP/PA coupler itself must be
installed outside the hazardous area.
Mechanical design
The mechanical design is characterized by the following points:
Connection system
3–2
•
Modular design in the S7-300 packaging system on a shallow S7 300 rail
with swivel-mounting and screw fixing.
•
Arrangement of all indicators and connectors at the front of the module.
•
Recessed arrangement of all plug-in connectors, covered by means of the
front doors.
•
Housing in degree of protection IP 20.
•
Cooling by convection.
•
Horizontal installation.
•
For shielding purposes, the S7 300 rail serves as the functional ground
reference point. Each module has an upper and lower shield contact spring
at the rear to provide the electrical connection to the S7 300 rail when the
module has been secured. Furthermore, the modules are equipped with
additional shielding plates.
•
Adequate EMC is ensured through the use of plastic housings and light
guide elements for the status indications.
•
The maximum overall mounting depth is 130 mm, height 125 mm. The
width of the DP/PA coupler is 80 mm.
•
The S7 300 rail is supplied in various widths for cabinet installation, and
in 2m lengths (standard S7-300 S7 300 rail).
•
Installation clearance of 40 mm above and below the module is necessary
for module handling, on account of the swivel-mounting system and
securing by means of a screwdriver. Cable ducts must be fitted outside
these clearances.
The connection system is characterized by the following points:
•
The 24 V DC supply voltage is connected with 4-pole screw terminals.
•
The PROFIBUS-DP interface is connected with a 9-pin sub D connector.
Strain relief and shielding are provided by this sub D male connector.
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3 Components of the field engineering package in detail
•
With the non-intrinsically safe variant, the PROFIBUS-PA interface is
connected via four screw terminals. The user can terminate the PA cable or
loop it through, as required. The terminating resistor is selectable and
integrated in the housing.
•
With the intrinsically safe variant, the PROFIBUS-PA interface is
connected via two screw terminals. The intrinsically safe DP/PA coupler is
always situated at the end of the PA cable. The terminating resistor
integrated in the housing is always active. With the intrinsically safe
variant, this means that the PROFIBUS-PA must not be looped through.
•
In both versions, the shield contact of the PA cable also serves for strain
relief.
A more detailed description of the module can be found in the DP/PA coupler
Manual /502/.
3.1.2 DP/PA link
Variants
The DP/PA link is formed from the IM 157 interface module and one or
more DP/PA couplers (flameproof or non-flameproof variants). All
components of the DP/PA link are interconnected via S7-300 standard bus
connectors.
By combining the IM 157 with flameproof or non-flameproof variants of the
DP/PA coupler, flameproof or non-flameproof variants of the DP/PA link are
also possible. This modular system can be expanded to up to 5 PA lines.
40
IM 157
80
DP/PA-Coupler
DP/PA-Link (one PA line)
Fig. 3-1 The DP/PA link with IM 157 interface module and a DP/PA
coupler
Mechanical design
The mechanical design is characterized by the following points:
•
Modular design in the S7-300 design system on a shallow S7 300 rail with
swivel-mounting and screw fixing.
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3 Components of the field engineering package in detail
Connection system
01.98
•
The maximum overall mounting depth is 130 mm, and height 125 mm.
The width of the IM 157 is 40 mm. The overall width of the DP/PA link
depends on the number of DP/PA couplers used.
•
The remaining mechanical design data are same as for the DP/PA coupler.
The connection system is characterized by the following points:
•
The 24 V DC supply voltage is connected with 4-pole screw terminals.
•
The PROFIBUS-DP interface is connected only at the IM 157 with a
9-pin sub D connector. The PROFIBUS-DP interfaces of the DP/PA
couplers used in the DP/PA link have no function. Strain relief and shield
contact are provided by the sub D male connector.
•
With the non-intrinsically safe variant, the PROFIBUS-PA interface is
connected via four screw terminals. The user can terminate the PA cable or
loop it through, as required. The terminating resistor is selectable and
integrated in the housing.
•
With the intrinsically safe variant, the PROFIBUS-PA interface is
connected via two screw terminals. The intrinsically safe DP/PA coupler is
always situated at the end of the PA cable. The terminating resistor
integrated in the housing is always active.
•
In both versions, the shield contact of the PA cable also serves for strain
relief.
A more detailed description of the module can be found in the DP/PA coupler
Manual /502/.
3.1.3 HART modules
3.1.3.1 Two-channel analog input module
Mechanical design
3–4
The mechanical design is characterized by the following points:
•
Modular design in the ET 200M design system on a shallow S7 300 rail
with swivel-mounting and screw fixing.
•
For operation in a distributed arrangement in the ET 200M with the
IM 153-2 interface module. Detailed information on the ET 200M
distributed I/O unit and interface module can be found in /140/.
•
Arrangement of all indicators and connectors at the front of the module.
•
Recessed arrangement of all connectors, covered by the front doors.
•
Housing in degree of protection IP 20.
•
Cooling by convection.
•
Horizontal mounting.
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Connection system
3 Components of the field engineering package in detail
•
For shielding purposes, the S7 300 rail serves as the functional ground
reference point. Each module has an upper and lower shield contact spring
at the rear to provide the electrical connection to the S7 300 rail when the
module has been secured. Furthermore, the modules are equipped with
additional shielding plates.
•
Adequate EMC is ensured by using plastic housings and light guide
elements for the status indications.
•
The maximum overall mounting depth is 130 mm and height 125 mm. The
width of the module is 40 mm.
•
The S7 300 rail is supplied in various widths for cabinet installation, and
in 2m lengths (standard S7-300 S7 300 rail).
•
Installation clearance of 40 mm above and below the module is necessary
for module handling, on account of the swivel-mounting system and
securing by means of a screwdriver. Cable ducts must be fitted outside
these clearances.
The connection system is characterized by the following points:
•
The 24 V DC supply voltage is connected at the 20-pin front connector by
means of screw terminals.
•
The 0/4 to 20 mA process signals are connected at the 20-pin front
connector by means of screw terminals.
•
Strain relief at the front connector.
•
Shielding depends on the conductor cross-section, by means of shield
contact elements to be ordered separately.
•
The module can be pulled out and inserted online with an active backplane
bus.
A more detailed description of the module can be found in the manual /503/.
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3 Components of the field engineering package in detail
3.2
01.98
Software/configuration
3.2.1 Configuration/project scope
DP/PA coupler
cyclic frame
(4 bytes measured value + 1 byte status)
acyclic frame
(Read alarm limit: 4 bytes)
PROFIBUS-DP
45.45 kBit/s
Cycle time =
4 x 10 ms + 10 ms = 50 ms
DP/PA coupler
10 ms
24 V
PROFIBUS-PA
31.25 kbit/s
10 ms
10 ms
10 ms
10 ms
Fig. 3-2 Block diagram for the determining of cycle times on the
PROFIBUS-PA using a transceiver module
Within the bus cycle time, each field device exchanges the most important
input and output data with the master. Additionally, the master accesses a
particular field device, for example, to write parameter assignment data or to
read diagnostic parameters. The number of field devices on the PROFIBUSPA segment governs the bus cycle time, i.e. the timebase in which the process
values are exchanged with the field devices. The bus cycle time is obtained by
adding the cyclic messages to all field devices, and the acyclic message to a
particular field device. In the example:
4 x 10 ms + 10 ms = 50 ms.
Note:
The value of 10 ms within the bus cycle time applies to field devices which
exchange a measured value or manipulated value with its corresponding status,
i.e. 5 bytes of useful data per cycle, with the programmable controller/system.
Examples of these field devices are pressure, temperature, level transducers,
valves and actuators. Complex field devices, for example those providing
several measured variables simultaneously (such as flow transducers), require
additional transfer time. With average field instrumentation, the number of
these complex field devices is relatively low and their influence on the overall
bus cycle time is negligible.
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3 Components of the field engineering package in detail
DP/PA link
Cycle time =
approx. 1 ms
cyclic frame
(4 bytes measured value + 1 byte status)
acyclic frame
(Read alarm limit: 4 bytes)
PROFIBUS-DP, 12 Mbit/s
max. 1 ms at 12 Mbit/s
DP/PA link
10 ms
Cycle time =
4 x 10 ms + 10 ms = 50 ms
24 V
PROFIBUS-PA
31.25 kbit/s
10 ms
10 ms
10 ms
10 ms
Fig. 3-3 Block diagram for the determining of cycle times on the
PROFIBUS-PA using a DP/PA link module
With the DP/PA link in operation, all cyclic messages and one acyclic message
are relayed via PROFIBUS-DP to the programmable controller / system within
the cycle of the PROFIBUS-PA line, in one message each. On account of the
high data transmission rate of up to 12 Mbit/s, the delay in data transmission is
insignificant (only about 1 ms even with 31 field devices per DP/PA link). The
DP/PA link (for SIMATIC PCS 7) has the same time response as the DP/PA
coupler, up to the maximum number of connectable field devices (31 field
devices per DP/PA link). Decisive advantages are obtained with structures in
which the field devices are distributed over several DP/PA links. At a
transmission rate of 12 Mbit/s on the higher-level PROFIBUS-DP, the delays
are only in the region of about 1 ms; the cycle time thus remains almost
independent of the number of field devices. With ten field devices per DP/PA
link, the cycle time is about 100 ms, and with 30 field devices per DP/PA link
about 300 ms.
3.2.2 Addressing of PROFIBUS-PA field devices
DP/PA coupler
With the DP/PA coupler in operation, the field devices are addressed
directly from the programmable controller/system; the DP/PA coupler
is transparent. DP/PA coupler (see Fig. 3-4, left half): The DP/PA couplers are
not apparent to the programmable controller / system (station no. 1) so that the
field devices (stations 2, 3 and 4) - as seen from addressing - are connected to
the same PROFIBUS segment. In this case the field devices are treated as
single slaves.
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3 Components of the field engineering package in detail
1
01.98
1
PROFIBUS-DP
45.45 kbit/s
2
DP/PA
coupler
24 V
24 V
1
4
Slave
24 V
PROFIBUS-PA
31.25 kbit/s
3
3
DP/PA link
24 V
2
PROFIBUS-DP
up to 12 Mbit/s
2
PROFIBUS-PA
31.25 kbit/s
3
Master
1
2
Fig. 3-4 Addressing of field devices within an automation system on
PROFIBUS-PA
DP/PA link
The DP/PA link is a slave on PROFIBUS-DP and a master on
PROFIBUS-PA. The programmable controller/system addresses the field
devices via the DP/PA link, that is, indirectly.
DP/PA link (see Fig. 3-4, right half): Each DP/PA link (stations 2 and 3 on
PROFIBUS-DP) is a station (slave) on the higher-level PROFIBUS-DP and
therefore appears to the programmable controller/system with only one station
address each. Furthermore, each DP/PA link (station no. 1 on PROFIBUS-PA)
is the master for the field devices connected to it (stations 2 and 3 or 2 on
PROFIBUS-PA).
Thus the DP/PA link acts as a "decoupler" for the transmission rate, allowing
the SIMATIC PCS 7 control system an extremely large addressing volume
(theoretically 5 x 96 DP/PA links of 31 field devices, i.e. theoretically 14,880
field devices per SIMATIC S7-400). In practice, this is limited by the
maximum number of measured values to be processed in the user program of
the S7-400 CPU.
Summary
Shown in Fig. 3-5 is the relationship between project scope and time response
using a DP/PA coupler and link modules with different configurations.
It can be seen that where two or more link modules are used with the same
number of field devices, the loading on the DP line corresponds approximately
to the loading of only one link module.
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3 Components of the field engineering package in detail
Cycle time per
DP line
DP/PA coupler
500 ms
30 field devices per DP/PA link
300 ms
10 field devices per DP/PA link
100 ms
Field devices per
DP line
10
20
30
50
90
Fig. 3-5 Overview of project scope: PROFIBUS-PA
HART
HART analog modules are used within the ET 200 M distributed I/O
system. Support of communication with HART devices via HART analog
module, inserted centrally in an S7-300, is not provided. Addressing takes
place accordingly. Further information can be found in /140/.
3.2.3 Parameter assignment / device profiles
Introduction
In order to allow uniform device responses, device profile definitions exist
/518/. The basic arrangement is explained in more detail in the following.
PROFIBUS-PA
Status
Measured value
DP services
cyclic and
acyclic
Measuring range
PA profile
Filter time
Alarm/warning limits
Alarm summary
DP services
acyclic
(e.g. for
pressure
transmitters)
TAG
Vendor-specific
parameters
DP services
acyclic
Fig. 3-6 Schematic representation of a device profile for the PA profile on
PROFIBUS-PA
Parameter groups
The parameters in a field device can be classified in three groups:
1.
Process parameters: Measured or manipulated value and corresponding
status
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2.
Operational parameters: Measuring range, filter time, alarm parameters
(message, alarm and warning limits), standard parameters (measuring point
identifiers, TAG)
3.
Manufacturer-specific parameters such as special diagnostic information
1st group
The parameters of the first group are read or written cyclically or acyclically
by the programmable controller/system. The measured value and status
parameters are present in all measuring field devices, and the manipulated
variable and status parameters are in all actuating field devices and are coded
uniformly (for example, measured/manipulated value in 4 bytes, IEEE format).
2nd group
The parameters of the second group can be read and written acyclically by
the programmable controller as required. Some of these parameters are
exchanged with the field devices via the function blocks in the programmable
controller/system, to allow access of the HMI system (for example,
visualization of alarm violation).
The parameters, that is the associated field device functions of the first and
second groups, are defined in the PA profile of the PNO guidelines
(PROFIBUS user organization) for PROFIBUS-PA. Some of these field device
functions are mandatory and some optional. Where optional functions are
implemented in the field device, they must comply with the description
according to the PA profile.
3rd group
The parameters of the third group are manufacturer-specific. Acyclic
access usually takes place with a personal computer for diagnostic and
maintenance purposes. In exceptional cases, certain parameters are also read or
written from this group by the programmable controller/system.
Interoperability
Programmable controllers/systems and PCs of different manufacturers can
read/write the parameters defined in the PA profile from all field devices via
PROFIBUS-PA, thus affecting the field device functions defined in the PA
profile.
The term "interoperability" is understood to mean the interaction between
components (control systems and field devices in this case) of different
manufacturers on an open bus system, on the basis of a vendor-independent
definition of the device and communications functions.
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3 Components of the field engineering package in detail
Vendor X
Vendor Y
PROFIBUS-DP
DP/PA coupler,
DP/PA link
PA profile
24 V
vendorspecific
PROFIBUS-PA
Vendor Z
Vendor Y
Fig. 3-7 Block diagram showing interchangeability of field devices on the
basis of the device profile on PROFIBUS-PA
On the basis of the parameters defined in profile PA, the programmable
controller of manufacturer X and the PC of manufacturer Y can access both
field devices of manufacturer Z and Y. The devices of manufacturers X,Y and
Z are interoperable.
Furthermore, data interchange of the manufacturer-specific parameters is
possible between PC and field device of manufacturer Y (homogeneous
communications network). Manufacturer-specific parameters are not used as a
rule in the programmable controller/system, but can be read, for example, to
create the plant image by the PC/PG.
The field devices are interchangeable whilst retaining functionality, provided
the functions of profile PA are used.
More detailed information on the individual, special device profile definitions
can be found in /518/.
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HART module
Measured value
Vendor
TAG
fast cyclic reading
by S7-400,
0/4 - 20 mA
universal
Measuring range
Filter time
Alarm/warning limits
Vendor-specific
parameters
slow acyclic read/ wr
common
practice
by SIPROM or
HART-handheld,
digital
device
specific
Fig. 3-8 Schematic representation of a device profile for HART
communications
Parameter groups
The parameters in a HART field device can be classified in three groups:
1.
Universal: Measured value or manipulated value, manufacturer name and
measuring point identifier (TAG)
2.
Common practice: Measuring range, filter time, alarm parameters
(message, alarm and warning limits)
3.
Device specific: For example, special diagnostic information
All three parameter groups are acquired via slow, acyclic reading by
SIMATIC PDM or a HART handheld terminal.
The measured value is represented by a 4 to 20 mA signal. The A/D or D/A
conversion takes place on the HART analog module, and this process value is
handled via fast cyclic reading/writing by the automation station. In
exceptional cases, certain parameter groups are also read and written
acyclically by the programmable controller system.
3.2.4 Device database (GSD) and device descriptions (DD)
Device database
The device database is a file containing the device’s master data enabling
the configuration of PROFIBUS-PA capable field devices in the SIMATIC
S5/S7/PCS 7 automation system. Each manufacturer of PROFIBUS-PA
capable field devices supplies a device database (GSD) with their devices.
These must be read into the engineering station and updated in the COM
PROFIBUS or STEP 7 program package in the HW-Config program section.
Further information on this topic can be found in /231/.
Device description
The device description (DD) is a universal, standardized device and
parameter description for PROFIBUS-PA and HART-capable field devices.
SIMATIC PDM is supplied with device data by the contents in the device
description.
These describe:
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3 Components of the field engineering package in detail
•
The user interface of SIMATIC PDM (text representation);
•
the interdependences of device parameters;
•
the online functions;
•
the methods (special routines or functions) and
•
the communications interfaces of the field devices.
3.2.5 Driver function blocks for the field engineering package
Introduction
In order to transfer process data between the I/Os and the user program,
field device blocks are needed. These field device blocks provide the interface
to the hardware, including functionality verification.
Detailed information on assigning parameters to blocks can be found in
/258/, Chapter 5.
The block types you use in PCS 7 can be purchased in the form of block
libraries or you can create them yourself. The following reference books are
available for the purpose:
•
Basic blocks library /258/
•
Technological blocks library /259/
•
Field device blocks library /260/
The existing set of block types can be extended if necessary. We recommend
the use of the basic blocks and reference manual /258/ in which the block
concept is described in detail (Chapter 2).
Field device blocks
Block name
IN_A1
PA_AI
PA_DI
PA_DO
PA_AKT
PA_TOT
Shown in table 3-1 below is a listing of the blocks used in the field
engineering package in the SIMATIC PCS 7 automation system. These field
device blocks can be found in the field device blocks library /260/.
Block type
Analog input driver
Analog input driver
Binary input driver
Binary output driver
Actuator
Analog input driver
Library
Basic blocks
Field device blocks
Field device blocks
Field device blocks
Field device blocks
Field device blocks
Application
HART- AI module
PROFIBUS-PA
PROFIBUS-PA
PROFIBUS-PA
PROFIBUS-PA
PROFIBUS-PA
Table 3-1: Field device blocks for the field engineering package
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Catalog data
01.98
4
This chapter contains:
4–2
4.1 Ordering data for the field engineering package
4–3
4.2 Cross-references to detailed catalogs
4–3
4.3 Positioning in the information environment
4–4
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4.1
4 Catalog data
Ordering data for the field engineering package
Ordering data
System overview, field engineering package
Drivers (basic blocks library)
PA drivers (field device blocks library)
Engineering toolset (STEP 7, SCL, CFC )
SIMATIC PDM
DP/PA coupler, intrinsically safe version
DP/PA coupler, non-intrinsically safe version
DP/PA link (IM 157)
Analog input module SM 331 AI 2 x HART
4.2
Order No.
6ES7 863 - 2DA00 - 0XX0
6ES7 863 - 5DA00 - 0XX0
6ES7 818 - 8AC00 - 0YE0
7MP 9900 - 0AA00
6ES7 157 - 0AD00 - 0XA0
6ES7 157 - 0AC00 - 0XA0
6ES7 157 - 0AA00 - 0XA0
6ES7 331 - 7TB00 - 0AB0
Cross-references to detailed catalogs
Catalog
ST 50
ST 70
ST 80
IK 10
ST PI
PM 10.1
KT 10
ST PCS 7
CA 01
Catalog contents
SIMATIC S5
Programmable controllers
SIMATIC
Automation systems
SIMATIC S7/M7/C7
SIMATIC HMI
Human-machine interface products / systems
SIMATIC NET
Industrial communication networks
PROFIBUS & AS-Interface
Components on the field bus
Printers and monitors for automation
Technical Catalog
Combination system
SITOP power supplies
SITOP connection, system cabling
SIMATIC
Process control system SIMATIC PCS 7
Components for automation
SIMATIC Field Engineering Package
Order No.
E86060-K4650-A101-A7
E86060-K4670-A101-A2
E86060-K4680-A101-A2
E86060-K6710-A101-A6
E86060-K4660-A101-A1
E86060-K3310-A101-A1
E86060-K2410-A101-A1
E86060-K4678-A111-A1
E86060-D4001-A100-A4
4–3
4 Catalog data
4.3
01.98
Positioning in the information environment
To support your configuration, there is extensive user documentation intended
for selective utilization. The following explanations are designed to facilitate
utilization of the user documentation.
Title
System description:
Process control system
PCS 7
STEP 7 user manual
Reference manual
System and standard
functions
ES manual
CFC manual
SFC manual
Reference manual of the
block libraries
WinCC manuals
DP/PA bus communication
mnual
4–4
Contents
This description provides an overview of components and functionality
of the SIMATIC process control system 7, and contains the system
topics of interest for operating a control system.
The STEP 7 user manual explains the basic utilization and functions of
the STEP 7 programming software. Whether you are a first user of
STEP 7 or have experience with STEP 5, the manual provides an
overview of the procedure for configuring, programming and startup of
an S7-300/400.
When working with the software, you can use the online help for
specific support in detailed questions of software utilization.
The S7-CPUs contain the system and standard functions integrated in
the operating system which you can use in programming. The manual
provides an overview of the functions and organization blocks
available as a basis with S7, as well as detailed interface descriptions in
the form of reference information, for utilization in your user program.
The engineering system (ES) manual for the technological hierarchy
(TH) and import–export assistant (IEA) of the PCS 7 engineering
package contains the principles and description of the procedure for
structuring plants technologically and independently of phases.
The manual for the CFC configuring tool (in the PCS 7 engineering
package) provides an overview and instructions for the procedure in
creating an overall software structure from prepared blocks.
When working with the software, you can use the online help which
answers your detailed questions on utilizing the CFC editor.
The manual of the SFC I&C package provides the information needed
for configuring sequence controllers.
When working with the software, you can use the online help which
answers your detailed questions on utilizing SFC.
The "Basic blocks", "Field device blocks" and "Technological blocks"
manuals contain detailed information on the blocks of the libraries.
The manuals provide the information need for configuring and working
with the HMI system and includes descriptions of the hardware,
software and process control.
This manual describes the hardware of the PROFIBUS communication
DP/PA in detail. It allows you to put bus communications into
operation.
SIMATIC Field Engineering Package
01.98
Reference manual
Automation systems
S7-300, M7-300, ET
200M
Flameproof I/O modules
Chapter 4
HART analog modules
ET 200M distributed I/O
unit manual
SIMATIC Field Engineering Package
4 Catalog data
This chapter of the reference manual describes the HART analog
module. It enables you to put the modules into operation.
This manual describes the design of the ET 200M distributed I/O unit
and includes a description of the IM 153-2 module needed for
operation of the HART modules.
4–5
01.98
5 Installation guidelines
Installation guidelines
5
This chapter contains:
5.1 Introduction
5–2
5.2 Mechanical and electrical installation
5–6
5.2.1 Installing the cables
5–6
5.2.2 Cable routes within and outside buildings
5–6
5.2.3 Cable specifications and cable recommendation for PROFIBUS-DP
5–8
5.2.4 Cable specifications and cable recommendation for PROFIBUS-PA
5–9
5.2.5 Shielding concept
5–11
5.2.6 Grounding and equipotential bonding
5–13
5.2.7 Lightning protection
5–13
5.2.8 Connectors
5–14
5.2.9 Installation materials and tools
5–15
5.3 Guidelines of the PNO (PROFIBUS Users' Organization)
5–16
SIMATIC Field Engineering Package
5–1
5 Installation guidelines
5.1
01.98
Introduction
General
A bus system is characterized in that many stations can communicate with
each other using a low amount of cabling. Another important criterion is the
capability of the expansion of existing system sections without having to
modify the existing structures. This criterion is met with PROFIBUS-PA.
The versatile system configuration of PROFIBUS-PA allows optimum
adaptation of field cabling to the local circumstances of the industrial plant.
SIMATIC S7-400
PROFIBUS-DP
DP/PA-Link
Hub
Terminating
resistor
Bus line
24 V
PROFIBUS-PA
T splitter
Spur cable
Fig. 5-1 Topology of PROFIBUS-PA
Connection system
The field devices are connected to the bus line by means of T splitters
and hubs (connection box).
A distinction is made between the following arrangements:
5–2
•
Bus line from the DP/PA coupler or DP/PA link to the field devices and
star-configuration cabling on site.
•
Field devices connected with T splitters and hubs along the bus line.
SIMATIC Field Engineering Package
01.98
5 Installation guidelines
T branch
Star / field distributor
(e.g. for 3 field devices)
Fig. 5-2 Connection diagram for field devices on PROFIBUS-PA
Number of
field devices
By means of the DP/PA coupler or DP/PA link, up to ten field devices
can be powered on a PROFIBUS-PA segment (shielded two-wire cable) in
the hazardous area, and up to 31 field devices in the non-hazardous area.
Cable lengths
The following cable lengths can be achieved independently of distribution
and number of PROFIBUS-PA devices:
•
Flameproof version 730m
•
Non-flameproof version 560m
Depending on the distribution and number of PROFIBUS-PA devices, greater
lengths can be achieved:
Power consumption
•
Non-flameproof and flameproof [ib] version 1900m max.
•
Flameproof [ia] version 1000m max.
Each field device on PROFIBUS-PA draws a static quiescent current of at
least 10 mA from the DP/PA coupler or DP/PA link via the data cable. Field
devices with lower power consumption, such as pressure, temperature or level
transducers, utilize this quiescent current for their own supply of power. The
total quiescent current of all stations is limited to 100 mA in the hazardous area
and 400 mA in the non-hazardous area. In the ideal case, each field device
draws precisely 10 mA quiescent current; in practice, however, it is between 10
and 30 mA according to field device.
SIMATIC Field Engineering Package
5–3
5 Installation guidelines
01.98
SIMATIC S7-400
PROFIBUS-DP
DP/PA link
≥ 10 mA
≥ 10 mA
PROFIBUS-PA
31.25 kbit/s
≥ 10 mA
≥ 10 mA
Spur line
max. 30 m
24 V
100 Ω
1 µF
≥ 10 mA
< 100 mA
(Type of protection: [EEx ib],
explosion group: IIC)
Two-core, shielded
cable, total
length max. 1,900 m
Supply of field devices:
Ex area: max. 10
Non-Ex area: max. 30
Fig. 5-3 PROFIBUS-PA powering of field devices
Type of data
transmission
Data transmission is achieved by modulating the quiescent current with
current signals of +/- 9 mA. The design of the flameproof variant of the
DP/PA coupler or DP/PA link according to [EEx ia] IIC allows the field
devices to be operated in zone 0 (5% of all applications in the hazardous area)
and zones 1 and 2 (both accounting for 95% of all applications in the
hazardous area).
Installation site
The DP/PA coupler and DP/PA link are so-called "associated apparatus"
with an intrinsically safe circuit (PROFIBUS-PA) which is installed outside the
hazardous area.
Installation
Simple and rugged installation:
Redundancy
concepts
5–4
•
Two-wire line with shield
•
Connection by means of terminals, no soldering
•
Field devices can be replaced during operation.
Redundancy can be created easily and without problems. Various redundancy
concepts are shown in Fig. 5-4.
SIMATIC Field Engineering Package
01.98
5 Installation guidelines
S7-400
S7-400
OLM
S7-400
OLM
PROFIBUS-DP
PROFIBUS-DP
PROFIBUS-DP
Star-configuration
structures with two
or more
interfaces
OLM
OLM
PROFIBUS-DP
with redundant
FO ring
Subordinate
mini-PLCs
Fig. 5-4 Redundancy concepts for PROFIBUS-DP
SIMATIC Field Engineering Package
5–5
5 Installation guidelines
5.2
01.98
Mechanical and electrical installation
5.2.1 Installing the cables
Installation
When installing the cables, ensure that they are not twisted, kinked,
stretched or crushed.
Connecting the shields
Shielded cables (braided shield) are recommended for the bus cable. This
recommendation also applies to any supply cables from external power
supplies to PROFIBUS devices (such as repeaters).
Doubled-shielded cables are particularly suitable for environments subject to
electromagnetic interference. To ensure optimum protection, the outer shield
(braided shield) and the inner shield (foil shield) at both cable ends must make
large-area contact to ground with a grounding clamp.
Where bus cables are inserted into electronics cabinets, the outer shield is
additionally given large-area contact to a shield bus to improve the diverting of
radio-frequency interference. The cable insulation should be stripped over the
width of the clamp by means of a cable knife, without damaging the braided
shield. The shield bus must have a good electrical connection with the cabinet
ground (screw-fitting with a toothed lockwasher).
For industrial areas subject to extreme electromagnetic interference
(converters), laying of the cable within a steel pipe or sheet-steel duct is
mandatory. The pipe or duct must have multiple grounding at various points.
Alternatively, a fiber-optic bus may be used.
Securing the cables
Bus cables must be mechanically secured at a distance of ≤ 1 meter from
the terminal of the connected device (by means of a cable tie or clamp, for
example). The device terminals generally serve only to divert the interference
currents (shield contact) and cannot counteract vertical or horizontal tensile
forces.
Equipotential bonding
Where circulating currents via the shield are expected to be higher than
permitted by the cable manufacturer, an additional equipotential bonding
conductor (≥ 10 mm2 copper) should be laid to the bus cable, parallel if
possible.
Note:
Particular attention must be paid to VDE 0165 Section 5.3.3. for operation in
hazardous zones. It specifies that in hazardous zones and with more than one
ground point, equipotential bonding is mandatory.
5.2.2 Cable routes within and outside buildings
Installing the cables
5–6
Shielded bus cables must be laid at a distance of at least 200 mm from
supply and high-voltage cables of more than 60 volts. With severe interference
sources (welding transformer, switched motors, etc.) the distance must be
increased to at least 500 mm.
SIMATIC Field Engineering Package
01.98
5 Installation guidelines
Installation next to telecommunications cables should be avoided because
mutual interference cannot be ruled out. Installation next to signal cables for
measurement and control with signal voltages of ≤ 60 volts is possible without
problems.
Laying on cable racks and channels is permissible. Adequate grounding should
be ensured. Even short spur cable racks or steel conduits should be grounded.
Protection
against damage
Where there is risk of mechanical damage (friction, walkways) special
protection must be provided (closed sheet metal duct or conduit).
If no cable racks, channels or ducts are available, the cable must be installed in
a conduit. This must be marked accordingly to prevent other cables from being
drawn in later. At expansion joints of the building, the conduit may be
interrupted for a maximum of 500 mm provided the cables cannot be damaged
by falling parts. At specially protected locations (electronics rooms) the cables
may be installed without conduit. The subsequent pulling-in of bus cables into
an occupied conduit is not permissible on account of the risk of mechanical
damage.
Storage and
transportation
During storage, transportation and laying, ensure that both ends of the bus
cable are sealed with caps or insulating tape. This prevents the ingress of
moisture and dirt.
Laying of cables
in the ground
In the ground, a cable must be laid in conduits or duct blocks. With direct
laying, the cable must be covered with an additional protective layer of sand
to prevent damage to the cable. The manufacturer’s specifications relating to
suitability of the particular cable to burying in ground must be observed. Some
manufacturers assign a particular color to the cable to facilitate identification
(for example, gray cable within buildings and black cable outside buildings and
in the ground).
For protection against the effects of lightning strikes, a 70 mm2 copper cable
or 40 x 5 mm steel strip must be laid about 0.5 m above a cable buried in the
ground (covered with sand or in a PVC conduit).
Permissible bending
radius
Particularly with fiber-optic cables, the bending radius must not be lower
than the minimum value specified by the manufacturer. For example, the
bending radius applying to the SIMATIC NET PROFIBUS plastic fiber cable
is ≥ 35 mm, and ≥ 150 mm for the corresponding glass fiber cable. The
corresponding tensile strengths must not be exceeded (10 N and 500 N
respectively for the above cables).
The following guide value applies to copper cable with a plastic sheath:
Laying radius = 12 x cable diameter
The maximum tensile stress (guide value) is 100 N.
SIMATIC Field Engineering Package
5–7
5 Installation guidelines
01.98
5.2.3 Cable specifications and cable recommendation for PROFIBUS-DP
Cable specification
Cable type
Impedance
Cable capacitance
Core cross-section
Signal attenuation
Shielding
Twisted pairs 1 * 2 or 2 * 2 or 1 * 4 (star
quad), shielded
120 Ω nom., 100 Ω min., 130 Ω max.,
f > 100 kHz
< 60 pF/m typ.
2
0.22 mm min., approx. AWG 24
1
9 dB max. over entire length of cable
section corresponding to 1200 m
100 kbit/s [RS 422A] or approx.
0.75 dB/100m f = 100 kHz
Apart from good RF characteristics, ensure
that the shield can be connected correctly.
Wrapped shield foil is not suitable. If
possible, use aluminum foil and copper
braid or at least copper braid.
Table 5-1: Cable specification
Cable
recommendation
The search for suitable cables with the above specifications was unexpectedly
difficult. Signal standard RS 485 was originally created for transmission on
telephone cables with 120 Ω impedance. These are frequently used without
shielding. Where they are shielded, it is usually static which explains the types
with aluminum foil and contact wire. However, the advent of ISDN networks
resulted in a general need for telephone cables with shielding at RF.
Two-wire data transmission at up to the highest frequency regions has
developed greatly in recent years as local area networks (LANs). In newer
buildings, LAN-capable universal cables are pre-installed in the infrastructure.
Unfortunately, the excellent cables developed for the purpose can hardly be
used for PROFIBUS because the impedance of this network cable is a standard
100 Ω. Although this value is precisely at the limit of the PROFIBUS
specification, the negative tolerance range of -10 % to -15 % can cause
unacceptable reflections with a terminating resistance of 120 Ω. Only cables
with an impedance complying with the specifications are shown in the
following table.
1The PROFIBUS standard specifies 6 dB here, adopted from the quoted standards including CCITT V.11. The max.
cable length of 1000 m mentioned therein is assumed to have a max. signal attenuation of 6 dB between transmitter
and receiver. The specified test set-up with a twisted telephone cable of 0.51 mm diameter copper and 100 Ω
terminating resistance already results in a resistive attenuation of 8.6 dB.
5–8
SIMATIC Field Engineering Package
01.98
5 Installation guidelines
Cable list
Manufacturer /
sales
Siemens AG
Siemens AG
Siemens AG
Siemens AG
Siemens AG
The data in this list have been taken from the manufacturers’ data sheets.
Suitability of the listed cables for PROFIBUS applications has not been
verified in practice. The selection criterion was the meeting of the above
specifications. The list is not complete.
Cable type
Impedance
No. of
cores
1x2
Core crosssection
0.32 mm2 Cu
stranded
Capacitance in Attenuation
operation
<30 nF/km
<0.5 dB/100m
38.4 KHz
SIMATIC
NET
6XV1 8300AH10
SIMATIC
NET
6XV1 8303AH10
SIMATIC
NET
6XV1 8300BH10
150Ω ± 15Ω
3 ... 20 MHz
SIMATIC
NET
6XV1 8303BH10
SIMATIC
NET
6XV1 8303CH10
Shielding
Remarks
Al.-clad
foil +
Cu braid
Bus cable
Standard with
PVC sheath
150Ω ± 15Ω
3 ... 20 MHz
1x2
0.32 mm2 Cu
stranded
<30 nF/km
<0.5 dB/100m
38.4 KHz
Al.-clad
foil +
Cu braid
Bus cable
Buried cable
150Ω ± 15Ω
3 ... 20 MHz
1x2
0.32 mm2 Cu
stranded
<30 nF/km
<0.5 dB/100m
38.4 KHz
Al.-clad
foil +
Cu braid
0.25 mm2 Cu
stranded
<30 nF/km
<0.5 dB/100m
38.4 KHz
Al.-clad
foil +
Cu braid
Bus cable with
PE sheath
(semi-luxury
foods and
tobacco)
Bus cable for
use as trailing
cable
150Ω ± 15Ω
3 ... 20 MHz
1x2
150Ω ± 15Ω
3 ... 20 MHz
1x2
0.25 mm2 Cu
stranded
<30 nF/km
<0.5 dB/100m
38.4 KHz
Al.-clad
foil +
Cu braid
Bus cable for
festoons
Table 5-2: List of copper cables
Manufacturer /
sales
Siemens AG
Siemens AG
Siemens AG
Siemens AG
Cable type
Wavelength
used
820 nm
SIMATIC
NET
6XV1 8201AH10
SIMATIC 820 nm
NET
6XV1 8202AH10
SIMATIC 820 nm
NET
6XV1 8201BH10
SIMATIC 660 nm
NET
6XV1 8304AN
Core
Sheath
diameter diameter
62.5 µm 125 µm
Material
No. of fibers /
Operating
Remarks
attenuation
weight per 100 m temperature
Glass
2/9.4 kg
-25 to +60 °C Outdoor cable
0.35 dB/100 m
Type 1
62.5 µm
125 µm
Glass
2/9 kg
0.35 dB/100 m
-5 to +60 °C
62.5 µm
125 µm
Glass
2/22 kg
0.35 dB/100 m
-20 to +50 °C Indoor cable
980 µm
1000 µm
Plastic
19 dB/100 m
0 to +70 °C
2/0.92 kg
Outdoor cable
Type 2
Indoor cable
Table 5-3: List of fiber-optic cables
5.2.4 Cable specifications and cable recommendation for PROFIBUS-PA
Cable specification
A two-core cable is specified as the transmission medium for the field bus
to DIN EN 61158-2. The electrical data are not specified although they govern
the achievable characteristics of the field bus (possible distances, number of
stations, electromagnetic compatibility). In the standard (Annex C, not for
SIMATIC Field Engineering Package
5–9
5 Installation guidelines
01.98
standardization, for information only) a distinction is made between four cable
types with the data presented in Table 5-4 (at 25° C).
Installations according to the FISCO model are not subject to safety restrictions
if the limits given in Table 5-5 are met. Operation beyond these limits is not
generally ruled out but must be considered in each case.
Type A
(reference)
Twisted pair,
shielded
Cable type
2
Core cross-section (nominal)
0.8 mm
(AWG 18)
44 Ω/km
100 Ω ± 20 %
3 dB/km
2 nF/km
1.7 µs/km
90 %
1900 m
Loop resistance (DC)
Impedance at 31.25 kHz
Wave attenuation at 39 kHz
Capacitive asymmetry
Group delay distortion (7.9 to 39 kHz)
Shield coverage
Recommended network size (inc. spur cables)
Type B
Type C
Type D
One or more
twisted pairs,
overall shield
Two or more
twisted pairs, not
shielded
Two or more
pairs,
not twisted,
not shielded
2
0.32 mm
(AWG 22)
112 Ω/km
100 Ω ± 30 %
5 dB/km
2nF/km
**
**
1200 m
2
0.13 mm
(AWG 26)
264 Ω/km
**
8 dB/km
**
**
400 m
(** Not specified)
Table 5-4: Cable types to DIN EN 61158-2, Section 11.7.2 and Annex C
EEx ia
Loop resistance (DC)
15...150 Ω/km
Inductance per unit length
0.4 ... 1 mH/km
Capacitance per unit length
80...200 nF/km 1)
Spur cable length
≤ 30 m 2)
Cable length
≤ 1 km
1
) Definition cf. PNO guide PROFIBUS-PA /505/
2
) Tentative values according to the FISCO model
EEx ib IIC / IIB
15...150 Ω/km
0.4 ... 1 mH/km
80...200 nF/km 1)
≤ 30 m 2)
≤ 5 km
Table 5-5: Safety limits for the bus cable
The cores of all field bus cables must be clearly selectable (for example, with
color coding or ring marking). Cables with intrinsically safe circuits must be
marked according to DIN 57 165/VDE 0165, Section 6.1.3.14 (for example,
with a light-blue sheath).
Where multi-pair cables are used in the hazardous area, the special installation
conditions of DIN 57 165 / VDE 0165 (Chapter 6) /8/ must be observed.
Cable recommendation The reference cable (Type A) must be used for conformance tests. For the
new installations of plants, the cables used must meet the minimum
requirements of Types A or B. With multi-pair cables (Type B), two or more
field buses (31.25 kbit/s) may be operated in one cable. Other circuits in the
same cable should be avoided.
Cables of Types C and D should only be used in retrofit applications (the
utilization of already installed cables) with a greatly reduced network size. In
these cases, allowance should be made for the fact that the interference
immunity of transmission often does not meet the requirements described in the
standard.
The overall cable length is defined as the total length of the main cable and of
all spur cables.
5–10
2
1.25 mm
(AWG 16)
40 Ω/km
**
8 dB/km
**
**
200 m
SIMATIC Field Engineering Package
01.98
5 Installation guidelines
No. of spur cables
Length of one spur cable,
intrinsically safe
30 m
30 m *)
30 m *)
30 m *)
25-32
19-24
15-18
13-14
1-12
Length of one spur cable,
not intrinsically safe
30 m
60 m
90 m
120 m
*) Tentative values according to the FISCO model (spur cable ≤ 1 m may be considered as a splice)
Table 5-6: Recommended lengths of spur cables
Overall cable length
> 400 m
< 400 m
Total length of splices
8m
2%
Table 5-7: Maximum lengths of splices
Cable list
The data in this list have been taken from the manufacturers’ data sheets.
Suitability of the listed cables for PROFIBUS applications has not been
verified in practice. The selection criterion was the meeting of the above
specifications. The list is not complete.
Manufacturer/ Cable type Impedance
sales
Siemens AG SIMATIC 100Ω ± 20Ω
NET
6XV1 8305AH10
Siemens AG SIMATIC 100Ω ± 20Ω
NET
6XV1 83035H10
No. of
cores
1x2
Core crossCapacitance Attenuation Shielding
section
in operation
0.75 mm2 Cu <90 nF/km <3 dB/km Cu braid
stranded
39 KHz
Remarks
1x2
0.75 mm2 Cu <90 nF/km
stranded
Bus cable
PVC sheath,
black
<3 dB/km
39 KHz
Cu braid
Bus cable
PVC sheath,
blue
Table 5-8: Cable list for copper cables
5.2.5 Shielding concept
To shield or not to
shield
EN 50170 Vol. 2 allows the user to decide whether to employ shielded
cable. Unshielded cable is permissible in an interference-free environment.
On the other hand, there is the following argument for always using shielded
cable:
•
Shielding rules
An "interference-free" area exists, if at all, only in the interior of shielding
cabinets. However, as soon as relays and switching contactors are installed
in them, the protection is lost.
For the optimum electromagnetic compatibility of systems, it is very
important that the system components and, in particular, the cables are shielded
and that these shields form a sheath which is as electrically seamless as
possible.
To quote the "Grounding, shielding" Section of the DIN standard: "When a
shielded bus cable is used, it is recommended that the shield be connected to
protective grounds with low inductance at both ends, to achieve the best
possible EMC. Separate potentials (for example in a refinery) are an exception;
as a rule, only single-ended grounding is permitted in these cases.
SIMATIC Field Engineering Package
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5 Installation guidelines
01.98
Note:
In systems without equipotential bonding, circulating currents at line frequency
can damage the bus cable in unfavorable cases (by exceeding the permissible
shield current). In these systems, therefore, the cable shield should be directly
connected to the building ground at one end only.
The connection between shield and protective ground (for example, unit
housing) should preferably be made via the metal housing and the screw-type
connection of the sub D connectors. Where this type of shielding is not
possible, grounding can be achieved via pin 1 of the connector."
It should be noted, however, that the connection via pin 1 does not meet the
"low-inductance" condition. With a view to EMC, it is better to expose the
cable shield at a suitable point and ground it to the (metal) structure of the
cabinet with the shortest possible cable connection (for example, with a shield
clamp in front of the connector).
Shield connection
By far the most important location of the shield ground connection is at the
entry of the bus cable into the cabinet. Long external cables are often routed
via terminals here. For the shield connection to meet the "low-inductance"
requirement, the following must be observed:
Note:
The cable shield must make contact over its circumference and have a largearea connection to the grounded structure (for example, ground bus, terminal
rail).
Here are the most common mistakes resulting in non low-inductance
grounding:
•
Connection via a sheath wire or contact wire.
•
Connection via a short length of stranded conductor (a few cm), soldered
on or crimped on ("pigtail method").
•
Opening up or unsplicing the cable shield and clamping it directly in a
ground clamp. If the resultant ground wire is not longer than about 2 cm,
this method is conditionally permissible.
•
Routing of shield grounds via lengths of stranded copper conductor, even
with large cross-sections (1.5 mm2 Cu).
With proper clamping of the cable shield by means of a cable clamp or other
clamping device, adequate contact pressure must be ensured. The clamping
pressure is often exerted against the cable’s insulation which creeps in the
course of time. Such arrangements require very great spring excursion. The
shield connection terminal of the KLBÜ series from Weidmüller is a
constructive response to the problem.
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5.2.6 Grounding and equipotential bonding
Protective grounding
The protection concept of the station supply governs the need for protective
grounding of a bus station. Consult the manufacturer’s data and local
specifications.
Equipotential bonding
The RS 485 bus segment with 2 to 32 transceivers (transmitter/receiver
modules) is electrically through-connected. Light equipotential bonding is
therefore always provided by the bus cable. The question is whether additional,
low-resistance equipotential bonding is necessary, as specified in the RS 485
standard.
Two-wire line
With a two-wire line, there is only light equipotential bonding. Isolation of
the transceiver from the station with its other potential connections is
unavoidable for fault-free data transmission.
Four-wire line
With a four-wire line, equipotential bonding is provided by the DGND
conductor. This arrangement does not depend on isolation of the transceiver. If
the DGND is grounded with two or more stations, excessive circulating
currents can flow on the bus cable. For this case, RS 485 specifies a series
resistance of about 100 ohms per station. Although this resistance provides
protection from excessive circulating currents, it reduces the equipotential
effect. Isolation of the transceiver is advantageous, even with equipotential
bonding.
Conclusion
Equipotential bonding according to RS 485 is only necessary when there
is no isolation of transceivers from other potential connections (such as
grounded supply, great capacitive coupling of an ungrounded supply).
Hazardous area
This is an area in which the risk of explosion or a hazardous explosive
atmosphere can develop as a result of local operational conditions. According
to the classification of this area, there are special requirements for the use
of electrical apparatus. Further explanations and instructions can be found in
VDE 0165 and /519/.
5.2.7 Lightning protection
Lightning protection is subdivided into external and internal protection. Where
bus cables are routed only within a building, only the internal lightning
protection need be taken into account.
External lightning
protection
External lightning protection always relates to the (bus) cables routed to the
plant sections located outside the building.
Where cables are laid in PVC or PE tubes, a grounding cable must be laid
about 0.5 m above the cables (at least 70 mm2 copper cable or 40 x 5 mm steel
strip). The copper cable or steel strip must be grounded at each entrance to the
building.
Bus cables laid above ground must be routed in a closed steel conduit or sheet
steel duct. Both the conduit and the duct must be grounded at least at the
beginning, at the end and at each entrance to the building.
Internal lightning
protection
All electrical and metal parts (cables, pipes, etc.) leading into a building
must be incorporated in the equipotential bonding for lightning protection.
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This means that all pipes (gas pipes, water pipes, cable conduits, etc.) must be
directly connected to the equipotential bonding rail at the entrance to the
building. The cores of power cables are connected to the equipotential bonding
rail via lightning arresters. This relates to EDP and bus cables as well as lowvoltage cables.
5.2.8 Connectors
PROFIBUS-DP
9-pin sub D connectors are used as the connection medium for the bus cable
(and for connecting PROFIBUS-PA to the DP/PA coupler). The connection
between core and socket or pin should be a screw terminal or soldered joint.
The cases of the sub D connectors should preferably be metal or metalized to
ensure EMC, also at the connector. Connectors should be secured to the
interface or station by an electrically conductive screwed connection.
DIN 41652, Part 1, applies to mechanical and electrical properties of 9-pin sub
D connectors.
PROFIBUS-PA
PA terminals are used as the connection medium for the bus cable between
the individual field devices. The connection between core and socket or pin
should be a screw terminal or soldered joint. The cases of the PA terminals
should preferably be metal or metalized to ensure EMC, also at the PA
terminal.
Note:
It is not recommended that PROFIBUS-PA be looped-through via the
individual field devices. Subsequent replacement of only one field device can
result in a breakdown of bus communications.
Sub D connectors with
solder terminals
Soldering work must be done cleanly and carefully. Additionally, a local
220/230 V outlet is needed for the soldering iron. Sub D connectors with
solder terminals are very common and are available from various
manufacturers.
Sub D connectors with
crimp terminals
The crimping operation is relatively critical and can only be carried out
with a special tool. If improperly created, crimp contacts can slip out of
their seat and impair the reliability of a connection. However, the work can be
carried out by one person. For production in a workshop, an automatic
crimping machine can considerably facilitate and accelerate the work (stripping
and crimping in one operation).
Sub D connectors with
screw terminals
Apart from the screwdriver and stripping tool, no other aids are needed. As
with modular terminals, screw connections are less subject to faults and
considerably easier to make than a soldered joint. No power is needed for a
soldering iron, nor is there any need for assistance by a second person. At
present, however, there are few providers of this simple connection system
(such as Phoenix Contact, Siemens, etc.).
Connectors for higher
degrees of protection
(IP65)
9-pin sub D connectors are not suitable for use in a harsh environment and
in environments with higher degrees of protection. For these applications,
there are round connectors made of metal which meet the higher
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requirements. Another possibility is to provide the plug-in connection in a
suitable housing and ensure the degree of protection at the cable bushings by
means of suitable heavy-gauge threaded joints. (Interfaces or stations in IP65
housings)
5.2.9 Installation materials and tools
Tool for
copper cable
In general, no special tools are required for fitting the copper bus cables.
Tools for
fiber-optics
No particular tools are required for fitting the fiber-optic cables. However,
the following points must be noted:
Installation materials
•
Prefabricated cables are usually available from individual companies for
connecting the FO components. These cables require no further treatment.
•
Where connectors must be fitted to the glass FO cables on site, there are
special splicing methods (mechanical or thermal) with which the
connectors can be properly clamped on. Splicing is normally undertaken
by trained specialists because maximum accuracy and cleanliness are
essential. Connectors can be fitted to FO cables or direct connections can
be made between FO cables.
•
Some companies offer special installation cases containing the necessary
tools and materials. Sometimes a microscope is needed in addition to the
installation case.
•
For simple connections, there are so-called finger splices. FO cables can
be easily interconnected (without special tools) by means of mechanical
self-alignment in the splice.
•
Plastic FO cables can be preassembled without problems at the plant.
Ground cables are normally connected directly to the supporting metal
structure with bolts (M6/M8/M10). To ensure a good contact, toothed
lockwashers are inserted between the painted metal and the nut or cable lug.
Bolts, nuts and lockwashers are therefore required as well as cable lugs.
The flexible cores of the signal cables are inserted into the terminals of the
PROFIBUS components with ferrules.
The shields are connected to the metal structure by means of large-area cable
clamps. Suitable cable clamps are therefore needed for the cables. It should be
noted that the shield creeps under the cable clamps. This means that a tightened
cable clamp becomes slack after a certain time and may no longer provide
large-area contact with the shield. Either the clamps must all be retightened
after about six months, or spring-loaded clamps are used to compensate for
cable creep.
The sizes of the bolts, nuts, toothed lockwashers, cable lugs, ferrules and cable
clamps to be procured are governed by the cross-sections of the cables and
lines used.
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5.3
01.98
Guidelines of the PNO (PROFIBUS Users’ Organization)
Introduction
References
PROFIBUS is an open field bus system which is suitable for various
application areas. The PROFIBUS standard is organized in four parts.
•
Part 1 describes the physics and transmission mechanisms.
•
Part 2 describes the FMS (field message specification) protocol which is
particularly suitable for communications at cell level.
•
Part 3 defines the DP (distributed I/O) protocol which is suitable for
simple I/O communications and time-critical requirements.
•
Part 4 describes the special definitions required for the intrinsically safe
area.
Shown in Table 5-4 is an overview of the most important documentation on
the PROFIBUS-PA topic from the PROFIBUS Users’ Organization.
Title
PROFIBUS Standard
DIN 19 245 Parts 1 + 2 (PROFIBUS-FMS)
DIN E 19 245 Part 3 (PROFIBUS-DP)
DIN E 19 245 Part 4 (Part of PROFIBUS-PA)
PROFIBUS guidelines
Implementation notes DIN 19 245 Part 1
Implementation notes DIN 19 245 Part 2
Implementation notes DIN E 19 245 Part 3
Test specification PROFIBUS-DP slaves
Test specification PROFIBUS-DP master devices
Optical transmission (fiber-optics)
PROFIBUS-DP function extensions
PROFIBUS-PA startup guide
PROFIBUS profiles
Profile for communications between controllers
PROFIBUS-PA profile for field devices
Brochures
PROFIBUS technical brochure
PROFIBUS for process automation
Technical literature and training materials
PROFIBUS Public 5
PROFIBUS FMS, -DP, -PA set of transparencies
M. Popp, Rapid entry PROFIBUS-DP
Software
PROFIBUS products and services
Device database (GSD) editor
Language
English
English
English
German
German
German
English
German
English
English
German
English
English
German /
English
German /
English
German /
English
German /
English
German /
English
English
Table 5-9: References of the PROFIBUS Users’ Organization
This literature can be obtained from:
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UK:
The PROFIBUS Group
1, West Street
GB-P014-4DH Titchfield, Hants
SIMATIC Field Engineering Package
USA:
PROFIBUS Trade Organization
5010 East Shea Blvd., Suite C-226
USA Scottsdale, AZ 85254-4683
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6 Hardware configuring (project example)
Hardware configuring (project example)
6
This chapter contains:
6.1 Configuring a station
6–3
6.1.1 Creating a station and starting the hardware configuration
6–4
6.1.2 Configuring the station
6–5
6.1.3 Loading the hardware configuration into a CPU
6–7
6.2 PROFIBUS-DP distributed I/O
6–8
6.2.1 Inserting a DP slave in a station
6–8
6.2.1.1 Device database (GSD files)
6–8
6.2.1.2 Using a SITRANS P via a DP/PA coupler
6–9
6.2.1.3 Using an ET 200M with a HART module
6–10
6.3 Station diagnostics
6–11
6.4 SITRANS P parameter assignment with SIMATIC PDM
6–12
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Introduction
01.98
•
Where the new field engineering is not directly affected, this chapter does
not cover the configuration and installation of AS and OS. Further details
are described in the references from /100/.
•
A knowledge of the systems and devices used is a prerequisite for
understanding the following explanations.
•
The communications paths within SIMATIC S7/PCS 7 are represented
schematically in Fig. 6-1 to facilitate understanding.
Engineering System ES
Operating and Monitoring
System OS (WinCC)
(CFC-Bibliothek: Stellvertreter-Bausteine,
SIPROM: Feldgeräte-Diagnose, - IBS,
Netz-Projekt.: DP/PA-Link, Feldgeräte)
PROFIBUS / Ind. Ethernet
Operating
and monitoring
of field devices
SIMATIC PCS 7
Configuring
SIMATIC S7-400
Field devices
data read/ write
Diagnostics
IBS
PROFIBUS-DP, up to 12 MBit/s
ET 200 M
PROFIBUS-PA
DP/PA-Link
4-20 mA
+ HART
Fig. 6-1 Communications paths for the intelligent field devices within an
automation system
The task
The procedure is explained in more detail on the basis of a specific task to
show how PROFIBUS-PA field devices and HART modules are utilized in a
project. The following points are to be implemented in the project:
6–2
•
Simple level control is to be created.
•
The process signal will be acquired by a field device with PROFIBUS-PA
connection.
•
The disturbance variable will be acquired via an analog input module with
HART function, incorporated in the ET 200M I/O system.
•
The actuating signal will be emitted via an analog output module without
HART function via the ET 200M I/O system.
•
Two separate PROFIBUS systems will be used:
−
PROFIBUS-PA (DP line 1)
−
ET 200M (DP line 2)
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The level range is 0 to 20 cm. Setpoint inputs, over the range 0 to 20 cm, are to
be made by the plant operator. The controller is only operated in the automatic
mode. If the level of 17 cm is exceeded, an alarm message is to be sent to the
OS.
Based on the task, the information flow is shown in Fig. 6-2. A block from the
"Technological blocks" library is used for information processing (closed-loop
control, operator action, message). Blocks from the "Field device blocks" and
"Basic blocks" libraries are used for process value acquisition. Output of the
manipulated variable is made by a function block from the "Basic blocks"
library. You find its structure in the block diagram of a technological block.
This consists of a group of basic blocks whose interconnection and parameter
assignments result in a particular technological function.
OS
Op. input block and message acquisition in the OS
Technological block
Op. input
Message
block
AS
block
Function
block
Input
driver
Input
driver
Output
driver
Input
module
HART
Output
module
Process
4..20mA
+HART
Dield device PA
Field device conv.
0/4...20 mA
Fig. 6-2 Principle of the solution with blocks, information path
6.1
Configuring a station
Note
In this description of the configuring a station, only those aspects directly
relating to the field engineering package are covered. PCS 7 is used as an
example. More detailed information can be found in the extensive references in
the appendix.
Fig. 6-3 below is an overview of a possible system configuration. Before you
start the configuration, draw up a concept for assigning the addresses. The
networks (MPI network, PROFIBUS network, etc.) are independent of each
other; they each have their own number tape for the addresses.
1
2
3
4
5
6
PS 407 CPU CP
CP
10A
416 2 443-5 443DP
Basic 5
Ext.
SIMATIC Field Engineering Package
DP-Strang-2 DP master system (2)
ET 200 M
DP line 1 DP master system (1)
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DP slave
SITRANS P
Fig. 6-3 Example of hardware configuration
Note:
Further information on configuring the hardware can be found in the manual
/100/.
6.1.1 Creating a station and starting the hardware configuration
To enter into configuring and parameter assignment, you need a station in your
project which you can only insert directly under a project:
6–4
•
Open the SIMATIC manager.
•
Open a new project with a new name (e.g. Controller).
•
Mark the project in the left part of the project window.
•
Using menu command Insert > Station > SIMATIC 400 station, insert a
new object. The station will be inserted with a preset designation (e.g.
SIMATIC 400 station(1), SIMATIC 400 station(2), etc.). You can replace
the station designations with system-related names (such as AS1).
•
When you double click on the SIMATIC station (right window) the
"Hardware" icon will appear on the right window.
•
Double click on the "Hardware" icon to open the configuring dialog.
•
Either the hardware catalog is displayed automatically or you open the
catalog with View > Catalog.
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6.1.2 Configuring the station
Once you have created the station, assemble the hardware components as
described in the task description:
•
Open catalog "SIMATIC 400" in the hardware catalog
Rack
Open catalog "Rack 400" and insert basic board UR2 by double clicking
(single clicking on the components will show the order number). The first slot
of the rack will be automatically preselected as the current location.
Power supply
Open catalog "PS-400" and select power supply "PS 407-10A" by double
clicking. HW-Config automatically places the module at the current slot in the
rack and marks the next free location as the current location.
CPU
Open "CPU 400" and select CPU 416-2DP. A PROFIBUS-DP connection
is integrated in this CPU, so you must configure the DP network as the next
step.
Note:
Ensure that a check symbol is entered in front of "Station is connected to
selected network". Only then will you have a connection to the DP network
with your station.
DP line 1
(CPU)
The following steps must be taken for parameter assignment of the DP
interface integrated in the CPU for DP line 1:
•
Enter the address (address 2) with which the integrated DP interface can
be addressed on the bus (see also Fig. 6-X).
•
Enter a new subnetwork for the DP line (NEW button) and change the
name to "DP line 1".
•
Enter the parameters for "Network settings" according to your system (e.g.
for "DP line 1" the highest PROFIBUS number: 126; baud rate: 45.45
kbit/s using a DP/PA coupler; profile: DP) and complete the menus for the
DP network with "OK". "DP master system (1)" will be displayed.
•
If entries are made under menu item "Lines", the bus parameters will be
computed automatically.
Note:
When configuring the input/output drivers, you must convert subnetwork
number "n" of the master system to hexadecimal and enter it at the parameter
"Subn1_ID" or "Subn2_ID" in the CFC chart.
In our example, this is a 1 corresponding to the DP master system (1).
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DP line 2
(CP 443-5 Extended)
01.98
You can insert another DP line in addition to the integrated DP with
communications processor 443-5 Extended.
•
Select the next free slot (slot 5) in your rack as the current slot by clicking
once (shown in blue).
•
Open Catalog "CP-400" in the hardware catalog and insert a CP 443-5
Extended in the rack. You are then automatically in the menu for
configuring the DP network.
Note:
Ensure that a check symbol is entered in front of "Station is connected to
selected network". Only then will you be connected to the PROFIBUS network
with your CP 443-5 Extended.
•
Enter the address (address 2) with which the CP 443-5 Extended can be
addressed on the PROFIBUS-DP.
•
Enter a new subnetwork for the DP line (NEW) button and change the
name to "DP line 2".
•
Double click the CP 443-5 Extended and open the "Mode" menu.
•
Set the "DP master" and "Delay (ms)" to 0.
•
Assign parameters to the "Network settings" menu according to your
system (e.g. for "DP line 2" highest PROFIBUS number: 31; baud rate:
1.5 Mbit/s for PROFIBUS-DP/PA (according to network requirements);
profile: DP) and close the menus for network configuring with "OK". A
new "DP master system (2)" will be displayed.
Note:
In configuring the input/output drivers, you must convert subnetwork number
"n" of the master system to hexadecimal and enter it at parameter "Subn1_ID"
or "Subn2_ID".
In our example, this is a 2 corresponding to the DP master system (2).
Small system
network (MPI)
If you wish to create only a small network and connect it via the MPI, you
must now assign parameters to the MPI of the CPU. Double click the
"CPU 416-2DP" in your rack (slot 3). Enter the parameter here for the MPI
integrated in the CPU.
Click on "MPI" and link the "MPI(1)" network created by the hardware
configuration to the MPI by clicking (MPI(1) appears in blue). Then complete
the MPI menu with "OK" twice.
The OS is incorporated into the MPI network in the same way.
System network
(PROFIBUS)
You need the 443-5 basic communications processor for communication
between AS, ES or OS systems via PROFIBUS.
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•
Select the next free slot in your rack (slot 6) as the current slot by clicking
once (shown in blue).
•
Open "CP-400" in the hardware catalog and insert a CP 443-5 Basic into
the rack. You are automatically in the menu for configuring the
PROFIBUS network.
Note:
Ensure that a check symbol is entered in front of "Station is connected to the
selected network". Only then will you later be connected to the PROFIBUS
network with your CP 443-5.
•
Enter the address with which the CP 443-5 can be addressed on the bus
(e.g. address 4).
•
Enter a new subnetwork for the PROFIBUS line (NEW button) and
change the name to "WinCC network".
•
Assign parameters to the "Network settings" menu according to your
system (e.g. for the "WinCC network" highest PROFIBUS number: 126;
baud rate: 1.5 Mbit/s; profile: standard) and close the menus for network
configuring with "OK".
6.1.3 Loading the hardware configuration into a CPU
Configuring of the SIMATIC station is terminated and you can pass on the
information to the CPU with "Target system > Load into module". To load
the module data, the CPU must be in the "STOP" state. A menu is displayed in
which you can select the target module for loading the hardware configuration.
In the example, there is a choice of the "CPU 416-2 DP(1)" and "CP 443-5
Basic(1)". If you leave both modules selected, you must load both modules.
The "CP 443-5 Extended" is not offered for loading because this module is
loaded as the DP master via the CPU.
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Note:
The first load operation of a CPU can only take place via the MPI of the CPU.
The CP 443-5 for the PROFIBUS is supplied with the communications
parameters. Each subsequent load operation can then take place via
PROFIBUS. Ensure that the correct module is assigned in the PG/PC interface.
During loading of the "CP 443-5 Basic", two additional queries appear. You
first specify that the configuration parameters are to be loaded into the RAM of
the module (the parameters will be retained in the event of a power failure);
additionally, you can decide whether or not the module is to be immediately
restarted after loading.
6.2
Note
PROFIBUS-DP distributed I/O
The following distinctions are made in the configuring of DP slaves:
•
Compact DP slaves are directly connected, individual devices
(for example, SITRANS P via a DP/PA coupler).
•
Modular DP slaves (for example, link modules with up to five
PROFIBUS-PA lines).
•
Intelligent slaves (I slaves) (DR 21 compact controllers).
Only aspects relating to PROFIBUS-DP/PA are covered. When a DP/PA
coupler is used in the DP network, the connected PROFIBUS- PA field devices
act as compact DP slaves. If the DP/PA couplers are grouped in a link module,
the link module acts as a modular slave.
6.2.1 Inserting a DP slave in a station
6.2.1.1 Device database (GSD files)
To incorporate various PROFIBUS-PA capable field devices, the device
database files supplied for the field devices must be inserted in the hardware
configuration.
Copy the device database files into STEP 7 catalog "GSD" with the Explorer
(standard path: SIEMENS\STEP7\S7Data\GSD).
So that the device database files will be known to the hardware configuration,
the files must be updated. You carry out this operation in Step7/hardware
configuration:
Tools > update device database files.
After updating, the slaves are available in hardware catalog.
6–8
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________________________________________________________
Note:
If a device database file is not correctly entered during updating (error message
"Device database file ..... not found" during positioning of the DP slave) the
name of the device database file must be changed so that there is an "X" as the
last character of the name (e.g. old name "abc01023.GSD" new name
"abc01023X.GSD").
________________________________________________________
6.2.1.2 Using a SITRANS P via a DP/PA coupler
The steps for inserting a slave in a DP/PA line are shown using the example of
a SITRANS P. In this case, the PROFIBUS-PA is linked via a DP/PA coupler
to the PROFIBUS-DP.
Note:
Please ensure that the hardware requirements for the PROFIBUS-PA are
met and that the baud rate is set to 45.45 kbit/s.
•
Open catalog "PROFIBUS-D" from the hardware catalog.
•
Open catalog "SITRANS" and use the left mouse key to drag the
"SITRANS P" to DP line "DP master system(1)".
•
You will see a menu for entering "Select specified configuration" by
preselecting the address identifiers (e.g. PV). For the SITRANS P, select
the setting "4 bytes/1 byte". You will then have a 4 byte-wide measured
value and a 1 byte-wide diagnostic byte in the corresponding driver (CFC
chart). The selection affects the addressing of inputs and outputs and,
therefore, the configuration. Information on the different specified
configurations can be found in the documentation of the relevant devices.
Exit the menu after setting the PROFIBUS address with "OK".
•
You will see a menu for making entries for "PROFIBUS station
SITRANS". Please enter the slave address, name and DP line name.
However, changes to the bus characteristics affect all the slaves situated on
the line and also change the bus characteristics already set for the master.
•
Store the current configuration and load it into your CPU as described in
/234/.
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6.2.1.3 Using an ET 200M with a HART module
ET200M
The steps for inserting a modular slave into a DP line are shown using the
example of an ET 200M with an HART module. DP line 2 was configured as
described in Section 6.1.2.:
•
Open catalog "PROFIBUS-DP" from the hardware catalog.
•
Open "ET 200M" and use the left mouse key to drag "IM153-2" to DP
line "DP master system(2)".
Note:
Remember that you can use a passive backplane bus or an active backplane bus
(removal and insertion of I/O modules during operation).
•
Enter the address of the ET 200M. A menu will appear for entering the
"PROFIBUS station characteristics". The subnetwork will be
automatically set by allocating the IM 153-2 to a line. Additionally, you
can change the characteristics of the DP line (highest number of stations,
baud rate, profile). However, changes will affect all the slaves situated on
the line and will change the bus characteristics already set at the master.
Exit the menu with "OK" after setting the bus number.
•
Select the first slot in the ET 200M (slot 4) as the current slot (blue
surrounding) and open the hardware catalog of the IM 153-2, which you
have dragged to the line.
•
Open a module type "AI-300" (analog inputs) and select module
SM 331 AI2xHART by double clicking. This module will automatically
be assigned to the current slot in the ET 200M, and the next free slot will
become the current slot.
•
Then open module type "AO-300" (analog outputs) and select module SM
332 AO 4x0/4..20mA by double clicking. This module will automatically
be assigned to the current slot in the ET 200M, and the next free slot will
become the current slot.
Note:
Please ensure that you do not use 8 analog modules with 8 channels each in an
ET 200M. Eight analog modules with 8 channels each (2 bytes per channel =
16 bytes) occupy 128 bytes in an ET 200M. However, the IM 153 only allows
124 bytes of useful data; the remaining 4 bytes are diagnostic data. /140/
•
6–10
After assigning the modules to the slots, you can double click a module in
the ET 200M to set the characteristics of the module (current or voltage,
live or dead zero, etc.). For assigning parameters to the individual
modules, please consult the module descriptions.
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Note:
When you select an ET 200M, a detailed view of the configured modules in the
selected ET 200M will appear, displayed line by line in a table.
HART module
The HART module is represented on three lines in the detailed view of the
ET 200M:
1. HART module itself
2. HART channel 1
3. HART channel 2
•
By double clicking the first line of the displayed HART module, you can
set the characteristics of the module (current signal, live or dead zero,
diagnostic alarm, etc.). For the assignment of parameters, please consult
the module description /503/.
Note:
For operation without HART functions, you can use the current range
0/4 to 20 mA; for operation with HART function the current range of
4 to 20 mA defined in the HART device will apply.
•
SIMATIC PDM
6.3
Store the current configuration and load it into your CPU.
By double clicking the first or second channel of the displayed HART
modules, you start the SIMATIC PDM parameter assignment software tool.
A device selection window will open first. All the HART protocol-capable
field devices available in SIMATIC PDM will appear in the device selection
window.
The remaining procedure is the same as that described in Section 6.4 as an
example for a PROFIBUS-PA device.
Station diagnostics
You have the facility for reading out the current status of modules for a
configured station. A prerequisite is that there is a connection between
automation system and PC/PG.
•
In the SIMATIC Manager, select the menu command "View > Online".
You will see an online view of you station.
•
Open the AS from which you wish to read the diagnostic data (click on the
"+" in front of the AS).
•
Open the CPU.
•
Select the program in the CPU with a click.
•
Execute menu command "Target system > Module state".
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•
01.98
Select "Diagnostic buffer" in the menu.
In the "Events" window, you will see messages of events in brief form. If you
click onto an event in this window, a detailed description of the event will
appear in the lower window. By clicking on "Event help" you can obtain
further instructions as to the assessment of events or clearing of an existing
fault.
6.4
SITRANS P parameter assignment with SIMATIC PDM
Note
Section 6.1.1.2 describes how you incorporate a field device with PA profile
in the hardware configuration. This section shows how you can assign
parameters to this field device with parameter assignment tool SIMATIC
PDM. However, only a few aspects are mentioned here. The online help is
expressly referred to. The parameter assignment interface represented by
SIMATIC PDM largely results from the DD description supplied with the field
devices. A description of individual parameters and parameter assignment
operations can be found in the device manuals. The online help is available for
further support.
Start
You start SIMATIC PDM by double clicking on the field device symbol
in the hardware configuration.
Device selection
In the device selection window, you will find all the field devices available
in SIMATIC PDM which may pertain to a device database (GSD).
Access authorization
Start menu
•
Double click onto the SITRANS P symbol on the DP line to obtain the
"Device selection" menu.
•
Open catalog "PROFIBUS-PA".
•
Open catalog "Siemens".
•
Select the device type (SITRANS P).
•
Select the type of measurement (absolute pressure).
•
Select the measuring range (250 mBar).
The access authorization (password) for the parameter groups in SIMATIC
PDM is defined in the "user" window. A distinction is made between two
access authorizations:
•
The specialist has access to all writable parameters.
•
The maintenance operator has only restricted read/write access to the
parameters.
The display which opens consists of three parts:
•
6–12
Menu bar for data management / data transfer
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6 Hardware configuring (project example)
•
Parameter tree for fast access to individual parameter groups
•
Parameter list
The contents of the parameter tree and parameter list are governed by the DD
description.
Parameter lists
Data management
Online functions
You can change all parameter fields with a white background in parameter
lists. Changed parameters and the corresponding parameter tree branch are
marked. The marking is only removed:
•
Upon archiving in the database;
•
upon transfer of the parameters to the field device.
The data record of each field device can be
•
edited offline;
•
archived in a database;
•
read out of the field device;
•
transferred to the field device
•
or printed.
The following online functions can be used with SIMATIC PDM:
•
Measured value indication with status
•
Alarm status
•
Device status
•
Address change
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7 Software configuring (project example)
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Software configuring (project example)
7
This chapter contains:
7–2
7.1 Project example: Control loop (CFC)
7–3
7.2 Project example: Sequential control system with two-step control (SFC)
•
7–6
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7 Software configuring (project example)
The task
7.1
On the basis of the task described in Chapter 6, the first example in this
chapter describes the implementation of the control loop as a continuous
control loop using the CFC configuring tool. In the second example, the
control loop is described as a two-step control loop using the SFC configuring
tool.
Project example: Control loop (CFC)
CFC
The continuous function chart (CFC) is a graphics editor. It serves to create
an overall software structure for a CPU from prepared blocks (blocks written
by the user or adopted from libraries). The blocks are positioned on function
charts, assigned parameters and interconnected. This results in an automation
structure which is loaded into the AS after generation of the executable
machine code.
Note:
A detailed description of the CFC can be found in the manual /254/.
Basic mode
of operation
You work with graphics in the CFC editor: You select prepared blocks from
the available set of blocks, position them with drag&drop on the chart, a kind
of "drawing sheet", and interconnect them with mouse clicks. You need not be
concerned with such details as algorithms or the allocation of machine
resources, but can concentrate on the technological aspects of configuring.
The run characteristics of the blocks are defaults but can be adapted separately
for each block. A considerable aid to working is that you can copy individual
blocks or entire groups of blocks from chart to chart or shift them. The block
interconnections are retained.
When you have created all the functions, you generate the executable machine
code by clicking the mouse, load it into the target system and test it with the
CFC test functions provided for the purpose.
Selecting the
blocks
Implementation of the solution principle shown in Fig. 6-2 is executed in
steps. The AS hardware was configured with STEP 7 resources in Chapter 6,
i.e. it is already known which analog input/output modules will be used, in
which rack and at which slot they are installed and to which module channel
the relevant level sensor (PROFIBUS-PA), flow sensor (HART) or actuator
(control valve) is connected. The software can be structured under CFC with
this assumption. For use of the blocks under simple STEP 7 methods (STL)
however, you must program the interconnections, parameter assignments,
allocation of various flags and block calls in the corresponding OBs. In neither
case do you need to program and test the various functions used. In this
example, we use the extensive block libraries made available to you in PCS 7.
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Drivers
•
Block IN_A1 is selected from the "Driver blocks" section of the "Basic
blocks" library for reading in the temperature (analog input module
SM 331 AI2xHART is supported by it).
•
The PA_AI block is selected from the "Driver blocks" section of the
"Field device blocks" library for reading in the level (the SITRANS P
pressure transducer is supported by it).
•
The OUT_A1 block is selected from the "Driver blocks" section of the
"Basic blocks" library to output the manipulated variable of the controller
(the accepted analog output module is supported by it).
•
Make a note of the subnetwork, rack and slot numbers of the modules used
(you defined these with STEP 7 during hardware configuring), the channel
numbers and measuring ranges of the connected process signals for
modules with the ET 200M. You must use these specifications when
structuring the individual driver blocks.
•
Make a note of the subnetwork and slave numbers of the connected
PROFIBUS-PA devices (you defined these with STEP 7 during hardware
configuring). You must use these specifications when structuring the
individual driver blocks.
Function blocks
The tasks of operating, controlling and signaling can be handled with a single
block, the CTRL_PID block. It has all the necessary characteristics for the task
presented:
•
PID controller
•
Operable with limits
•
Signaling capability
This block can be found in the "Technological blocks" library.
Note:
Compared to the solution from the "Basic blocks" library, this solution for the
subtasks (control, limit monitoring, operating and monitoring as well as
signaling) with a CTRL_PID block results in a shorter runtime, smaller
memory requirement and lower structuring overhead.
Structuring the
blocks
Described in the following is the procedure using the CFC for the task
(as the standard tool for configuring process-engineering plants). For
details of the CFC handling or project management, please consult the CFC
manual.
•
7–4
Place a chart with a designation corresponding to the task (e.g. LICA_123)
in the chart container of your project.
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7 Software configuring (project example)
•
Open the chart.
•
Position one entity of each of the previously selected block types (in the
example, one IN_A1, PA_AI, OUT_A1, CTRL_PID in each case) on your
chart by transferring it from the block library.
•
Name the blocks according to your wishes.
•
For editing (CFC keyword "Run characteristics") register all entities in a
common time-interrupt OB (e.g. OB32). In the sequence for block calls
from the OB, the general rule "Read in–>Edit–>Output" must be followed.
To specify the sequence, you must establish where each block obtains its
parameters. As a rule, it must be reported to all other blocks from which it
obtains interconnected values. In this example:
IN_A1, PA_AI, CTRL_PID, OUT_A1.
•
Interconnect the outputs of the blocks supplying values to the
corresponding inputs of the blocks which process these values.
•
With each entity, assign parameters to the inputs whose default values
must be adapted to specific process specifications. In this example, those
are at least the following parameters:
−
– IN_A1: SUBNET1_ID, RACK1_NO, SLOT1_NO, CHANNEL,
VHRANGE, CUR_VOL.
−
– CTRL_PID:
−
– Adapt GAIN, TN, TV and TM_LAG to the plant behavior.
−
– SP_HLM, SP_LLM for setpoint limiting.
−
– PVH_ALM and message text (if desired) for OS.
−
– OUT_A1: SUBNET1_ID, RACK_NO, SLOT_NO, CHANNEL,
UHRANGE, CUR_VOL
•
Interconnect the outputs to the inputs according to the diagram in
Fig. 6-2.
•
Generate the AS code and load it into the AS. Test the structure with the
online testing aids.
•
Configure the OS image block of the CTRL_PID (see its description,
section entitled "Operator control and process monitoring via OS" /254/).
Note:
This simple example contains no reaction to error indications of the individual
blocks. The example can be extended by inserting MUX2_R blocks at various
points in the structure. These can be interconnected to the error outputs of the
blocks (ENO or QERR) to provide a safety/substitute value for further
processing in the event of an error.
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7.2
Project example: Sequential control system with two-step
control (SFC)
SFC
A sequential function chart (SFC) is a sequential control system. The SFC
editor is a tool for creating sequential control.
In the following text, SFC is understood to mean either the sequential control
system or chart or the editor, according to the context.
An SFC is uniquely allocated to a CPU where it is fully processed. However, it
may also relate to automation functions of other CPUs.
Basic method
of operation
In the SFC editor, you create the chart with graphics. The structural elements
of the chart are positioned according to specific rules. You need not be
concerned with details such as algorithms or the allocation of machine
resources, but can concentrate on the technological aspects of configuring.
When the chart topology has been created, you change to the detailed
representation (zoom configuring) and assign parameters to the individual
elements; this means you configure the actions and conditions.
After configuring, you let the SFC generate the executable machine code; you
then load it into the target system and test it with the SFC test functions.
After transfer of the charts, WinCC offers you a convenient graphic
visualization of your charts without additional configuring overhead (SFC
visualization).
7–6
•
Insert an SFC in your chart container. You can change the chart name
under Characteristics.
•
Open the chart with a double click and create your sequential control
system.
•
For editing (Characteristics >Run) register the chart in a time-interrupt
OB (e.g. OB34).
•
In all representations (SIMATIC manager, dialog fields for selecting the
charts, reference data, documentation, etc.) the chart name is extended to
include the technological hierarchy if it is assigned to a hierarchy
container.
SIMATIC Field Engineering Package
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Additional run
characteristics
.
Chart topology
7 Software configuring (project example)
By clicking "Characteristics", you open a second dialog field for checking
and for entering additional run characteristics.
•
Leave the default "1" for reduction unchanged. This means that the SFC
will be processed with each run.
•
A phase shift to achieve a different load distribution within the CPU is not
required in this project. Therefore, leave the default "0" unchanged.
•
Click the Autostart field so that the sequential control system will be
started immediately after loading into the AS.
•
The default mode "Step control with transition (SSMT)" also remains
unchanged because the SFC is to run automatically without other operator
actions.
•
For run options, click the field for cyclic operation and for command
output; leave the time monitoring switched off.
•
Close both dialog fields successively with "OK". You can now turn to
configuring the chart topology.
You now create the structure of the sequential control system. You have
decided which actions and conditions are necessary for the two-step control,
and insert the basic and structural elements accordingly.
•
Detailed configuring
For the next configuring step, go over to the detailed representation of the
steps and transitions. The assigning of parameters to these elements is therefore
also known as "Zoom configuring".
The steps and transitions are linked to the "Block world" with zoom
configuring.
•
Compiling
Loading the AS
Insert the transitions, steps and loops into the chart.
Open the "Object characteristics" dialog field for the first step and edit it.
Then work step by step, followed by all transitions in succession.
You must then compile the graphically created chart in the machine code of
the target system.
•
Click on "Compile... " in the "Chart" menu.
•
The "Compile" dialog field is displayed. It contains the name of the target
system (CPU414-2 DP1) and the chart container name whose contents will
be compiled. The scope of compilation can be selected with the option
buttons "All" or "Delta".
After compilation, the dialog field appears with the result protocol. There
are no errors and no warnings; you can now close the dialog field.
The compilation is completed and the blocks have been generated. The next
stage is to load the generated program into the target system.
Target system > Load
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7 Software configuring (project example)
01.98
Note:
A detailed description of SFC charts can be obtained from the manual \255\.
Visualization in
WinCC
You transfer your created SFC charts to the WinCC data store. Without
additional configuring overhead, you can then display the current status
of the sequential controllers in the WinCC runtime, and operate the control
system according to the preset authorization stage.
•
In key set 2 (Runtime), click on the button for SFC visualization.
•
From the displayed overview, select your desired chart; you will see the
selected chart in the overview.
•
Double-click the overview and you will see a detailed view of your chart.
•
In the detailed view, you can control the chart (switch on, switch off, step
control with transitions, step control with condition, etc.) and use a double
click to display the transitions or steps with the current statuses and
remarks from the engineering system.
Furthermore, you have a facility for incorporating an SFC standard display in a
process display. The chart will then be allocated to a process display and the
operator need not filter out the required chart from a large number of them.
Displaying the SFC image
Insert the "SFC control" image block in your display.
Connecting the SFC display
• In the dynamic wizard, select "SFC" from the upper window.
Note:
When you display an SFC image in a process image for the first time, the script
for the "SFC display" is not yet available. In this case, click onto the "Read
in..." button in the displayed dialog field and insert the script
"Script.wnf" (path: WinCC\wscripts\wscripts.deu).
_______________________________________________________________
7–8
•
Select your desired chart and specify the window with which the SFC is to
be displayed after clicking the corresponding button in the SFC display
(overview or extract). Exit the wizard.
•
Store your process display and exit the graphics designer.
SIMATIC Field Engineering Package
01.98
References
References
A
/100/ Installationshandbuch: Automatisierungssysteme S7-400,
M7-400,
Aufbauen
/101/ Referenzhandbuch: Automatisierungssysteme S7-400, M7400,
Baugruppendaten
/102/ Operationsliste: Automatisierungssystem S7-400,
CPU 414/416
/140/ Dezentrales Peripheriegerät ET 200M
Handbuch
/141/ Dezentrales Peripheriegerät ET 200L
Handbuch
/231/ Benutzerhandbuch: Basissoftware für S7 und M7,
STEP 7
/232/ Handbuch: AWL für S7-300/400,
Bausteine programmieren
/233/ Handbuch: KOP für S7-300/400,
Bausteine programmieren
/234/ Programmierhandbuch: Systemsoftware für S7-300/400,
Programmentwurf
/235/ Referenzhandbuch: Systemsoftware für S7-300/400
System-und Standardfunktionen
/236/ Handbuch: FUP für S7-300/400
Bausteine programmieren
/237/ Gesamtindex, STEP 7
/250/ Handbuch: SCL für S7-300/400,
Bausteine programmieren
/251/ Handbuch: GRAPH für S7-300/400,
Ablaufsteuerungen programmieren
/252/ Handbuch: HiGraph für S7-300/400,
Zustandsgraphen programmieren
/253/ Handbuch: C für S7-300/400,
C-Programme erstellen
/254/ Handbuch: CFC,
Basis–Teil und Systemspezifischer Teil: S7 / M7 Technologische
Funktionen grafisch verschalten
/255/ Handbuch: Process Control System PCS 7,
SFC Technologische Ablaufsteuerungen projektieren
/256/ Handbuch: Process Control System PCS 7,
ES Anlagen technologisch und phasenübergreifend strukturieren
SIMATIC Field Engineering Package
1
References
01.98
/257/ Handbuch: Process Control System PCS 7,
BATCH flexible–System Chargenprozesse automatisieren
/258/ Referenzhandbuch: Process Control System PCS 7,
Bibliothek Basisbausteine
/259/ Referenzhandbuch: Process Control System PCS 7,
Bibliothek Technologische Bausteine
/260/ Referenzhandbuch: Process Control System PCS 7,
Bibliothek Feldgerätebausteine
/261/ Systembeschreibung: Process Control System PCS 7
/280/ Programmierhandbuch: Systemsoftware für M7-300/400,
Programmentwurf
/281/ Referenzhandbuch: Systemsoftware für M7-300/400,
System- und Standardfunktionen
282/ Benutzerhandbuch: Systemsoftware für M7-300/400,
Installieren und Bedienen
/290/ Benutzerhandbuch: ProC/C++ für M7-300/400,
C-Programme erstellen
/291/ Benutzerhandbuch: ProC/C++ für M7-300/400,
Debugger für C-Programme
/300/ Broschüre: SIMATIC WinCC,
Windows Control Center
/301/ Handbuch: SIMATIC WinCC,
Control Center + Global Script + User Administrator
/302/ Handbuch: SIMATIC WinCC,
Graphics Designer
/303/ Handbuch: SIMATIC WinCC,
Tag Logging + Alarm Logging + Report Designer
/304/ Handbuch: SIMATIC WinCC Options,
Basic Process Control + Advanced Process Control + ChipCard +
Video
/500/ Handbuch: SIMATIC Communications,
NCM S7-H1 (Ethernet)
/501/ Handbuch: SIMATIC Communications,
NCM S7-L2 (PROFIBUS)
/502/ Handbuch: SIMATIC,
Buskopplung DP/PA
/503/ Automatisierungssystem: SIMATIC ,
S7-300,M7-300,ET200M
Ex-Pheripheribaugruppen
Referenzhandbuch
/504/ Geting up: SIMATIC PCS 7,
Leitfaden
2
SIMATIC Field Engineering Package
01.98
References
/505/ PROFIBUS-PA ,
PNO - Leitfaden
/506/ PROFIBUS Standard,
DIN 19 245 Teil 1 + 2 (PROFIBUS-FMS)
/507/ PROFIBUS Standard,
, DIN E 19 245 Teil 3 (PROFIBUS-DP)
/508/ PROFIBUS Standard
,PNO - Leitfaden DIN E 19 245 Teil 4 (Teil von PROFIBUS-PA)
/509/ PROFIBUS Richtlinie ,
Implementierungshinweise DIN 19 245 Teil 1
/510/ PROFIBUS Richtlinie ,
Implementierungshinweise DIN 19 245 Teil 2
/511/ PROFIBUS Richtlinie ,
Implementierungshinweise DIN E 19 245 Teil 3
/512/ PROFIBUS Richtlinie ,
Prüfvorschrift PROFIBUS-DP Slaves
/513/ PROFIBUS Richtlinie ,
Prüfvorschrift PROFIBUS-DP Master Geräte
/514/ PROFIBUS Richtlinie ,
Optische Übertragungstechnik (LWL)
/515/ PROFIBUS Richtlinie ,
PROFIBUS-DP Funktionserweiterungen
/516/ PROFIBUS Richtlinie ,
PROFIBUS-PA Inbetriebnahmeleitfaden
/517/ PROFIBUS Profile ,
Profil für die Kommunikation zwischen Controllern englisch
/518/ PROFIBUS Profile,
PROFIBUS-PA Profil für Feldgeräte
/519/ Automatisierungssystem: SIMATIC ,
S7-300,M7-300,ET200M
Ex-Pheripheribaugruppen
Grundlagen Explosionschutz
SIMATIC Field Engineering Package
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SIMATIC Field Engineering Package
References
1
Index
Index
01.98
B
A
Addressing 3–7
B
Bending radius 5–7
Block libraries 3–13
Bus cycle time 3–6
Bus system 5–2
C
Cable capacitance 5–8
Cable laying 5–6
Cable specification 5–8, 5–9
Cable type 5–8
Cables 5–6
CFC 7–2
COM PROFIBUS 2–5
Communications paths 6–2
Configuring 2–5, 6–3
Conformity 1—2
Connection system 5–2
Connectors 5–14
D
Data transmission 5–4
DD 3–12
Device database 6–8
Device database file 3–12
Device description 3–12
Device profiles 3–9
Driver function blocks 3–13
E
Equipotential bonding 5–6, 5–13
F
Field device blocks 2–5, 3–13
G
Grounding 5–13
GSD 3–12
H
Hardware 3–2
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Index
Hardware components 2–2
Hardware configuring 2–5
HART 1—6, 1—12, 2–3, 3–9
HART modules 3–4
I
Impedance 5–8
Installation 5–4
Installation guidelines 5–1
Installation site 5–4
Installing 5–6
Interface module IM 157 3–3
Interoperability 3–10
L
Lightning protection 5–13
Link 1—9, 2–3, 3–7, 3–8
M
Machine code 7–2
P
PA profile 3–9, 3–11
Parameter assignment 2–5
Potential savings 1-10
Power consumption 5–3
PROFIBUS 1—5
PROFIBUS DP 1—5, 1—7
PROFIBUS PA 1—5, 1—8
Project scope 3–6
R
Redundancies 5–4
RS 485 5–9
Run characteristics 7–6
S
Sequential control system 7–5
SFC 7–5
Shield 5–6
Shielding 5–8
Shielding concept 5–11
Signal attenuation 5–8
PDM 2–5, 6–12
Small system network 6–6
Station diagnostics 6–12
System network 6–7
T
Tools 5–15
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Index
01.98
Transceiver 1-9, 2–2, 3–6, 3–7
4
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Index
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Index
01.98
C
Glossary
A
Address
An address is the identification for a particular operand or operand range.
Examples: input I 12.1, flag word FW 25, data block DB 3.
Analog module
Analog modules convert analog process values, such as temperature, to
digital values which can be further processed by the CPU, or convert digital
values to analog manipulated variables.
Arrangement,
centralized
There is a centralized arrangement when the process I/Os and CPU are
accommodated in the same rack or in expansion units in the same or adjacent
cabinet.
Arrangement,
distributed
There is a distributed arrangement when the process I/Os are not arranged
with the CPU in the same rack or in the same or adjacent cabinet, but
are separated and interconnected by a communications bus (e.g. field bus).
Automation system
An automation system is a → programmable controller with control system
functionality, comprising at least one → CPU, various input and output
modules as well as HMI devices.
B
Backplane bus
The backplane bus is a serial data bus via which the modules communicate
with each other and via which they are supplied with the required power. The
connection between the modules is provided by bus connectors.
Baud rate
The baud rate is the speed of data transmission; it indicates the number of
bits transmitted per second (baud rate → bit rate).
Baud rates of 9.6 kbaud to 12 Mbaud are possible with the ET 200.
Blocks
Blocks are parts of a user program, demarcated by their function, structure
or purpose.
Bus segment
→ Segment
C
Central section
The central section of an AS comprises the following components: CPU,
rack, power supply, main memory and load memory. The basis is the
SIMATIC S7–400 automation system.
CFC
A continuous function chart makes function charts in which blocks can be
interconnected and assigned parameters.
Chart
A chart is the highest hierarchical level of a hierarchical block entity system.
It has an implicit type but no interface and therefore cannot be connected.
Charts cannot contain charts.
Cold restart
During the startup of the AS CPU (e.g. when the mode switch is changed from
2
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Index
STOP to RUN or upon POWER ON), either organization block OB 101 (warm
restart only with the S7-400) or organization block OB 100 (cold restart) is
first processed before the cyclic program processing (OB 1). With a cold
restart, the process image of the inputs is read in and the S7 user program is
processed, starting with the first command in OB 1.
Configuration
The assignment of modules to racks/slots and addresses. A distinction is made
between the actual configuration (modules plugged in) and the specified
configuration. You preset the latter with STEP 7, COM PROFIBUS (or COM
ET 200 Windows). The operating system can thus detect modules inserted
incorrectly during the → start.
CPU
Central processing unit of the S7 automation system with its control and
arithmetic unit, memory, operating system and interface for programming
device.
D
Device description
(DD)
This is a universal, standardized device and parameter description for
PROFIBUS-PA and HART protocol-capable field devices.
Distributed I/O
The distributed I/O are devices situated at a distance from the central
section and serve for input/output (e.g. field devices or analog and digital
modules).
DP address
Each station must be given a DP address for unique identification on the
PROFIBUS-DP. The PC/PG or ET 200 handheld have the DP address "0".
The DP master and DP slaves have a DP address in the range 1 to 125.
DP master
A → master which behaves according to standard EN 50170, Volume 2,
PROFIBUS, is known as a DP master.
DP slave
A → slave which is operated on PROFIBUS with the PROFIBUS-DP
protocol and which behaves according to standard EN 50170, Volume 2,
PROFIBUS, is known as a DP slave.
DP standard
DP standard is the bus protocol according to standard EN 50170, Volume 2,
PROFIBUS.
E
Engineering system
A PC-based configuring system with which the process control system can
be configured or adapted to the required tasks, in a convenient and visual
manner.
ES
→ Engineering system
ET 200
The ET 200 distributed I/O system with the PROFIBUS-DP protocol is a bus
for connecting distributed I/Os to a CPU or adequate DP master. ET 200 is
characterized by fast reaction times because only a few data (bytes) are
transferred. ET 200 is based on standard EN 50170, Volume 2, PROFIBUS.
ET 200 operates according to the master-slave principle. DP masters can be,
for example, the IM 308-C master interface or the CPU 315-2 DP. DP slaves
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can be the distributed I/Os ET 200B, ET 200C, ET 200M, ET 200U or DP
slaves from SIEMENS or other manufacturers.
F
Field devices
Intelligent field devices can be connected via their field bus interface over
PROFIBUS-DP or PROFIBUS-PA, and thus linked to the control system.
Substitute blocks are available for the SIEMENS field devices.
FO
The abbreviation for fiber optic (cable) the transmission medium for
PROFIBUS.
Function block
According to IEC 1131-3 , a function block (FB) is code block with static
data which has a "memory". A function block offers the facility for transferring
parameters in the user program. Function blocks are thus suitable for
programming frequently recurring complex functions such as closed-loop
controls and mode selection.
G
H
I
I/O bus
Part of the S7 300 → backplane bus in the automation system, optimized
for the fast exchange of signals between the IM 153 and the signal modules.
Useful data (e.g. digital input signals of a signal module) and system data (e.g.
_default parameter data records of a signal module) are transferred via the I/O
bus.
IP 20
Degree of protection to DIN 40050: Protection against touching with the
fingers and against the ingress of solid foreign bodies with a diameter of more
than 12 mm.
J
K
L
M
Master
When a master is in possession of the token, it can send data to other
stations and request data from other stations: → DP masters are, for example,
the CPU 416-2 DP or IM 308-C.
Master-slave
procedure
A bus access process with which only one station is the → DP master and
all other stations are the → DP slaves.
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Index
Message class
The message class governs the nature of the message. With SIMATIC PCS 7
the message classes are alarm, warning, tolerance, AS and OS control system
message, process message, operator input request and operator input message.
Message type
There is a further subdivision for each message type (e.g. alarm, warning,
tolerance). Together with the message class, this governs the type of message.
Examples of messages types are alarm_high, alarm_low, warning_high,
warning_low.
Messages,
configuring of
The creating of messages with their texts and attributes. Messages are
configured from the CFC/SFC.
Module
parameters
Module parameters are values with which the behavior of the module can be
set. A distinction is made between static and dynamic module parameters.
MPI
The multipoint interface is the programming device interface of SIMATIC
S7. It forms the entry level of a system bus with SIMATIC PCS 7.
N
Network
A network comprises one or more linked subnetworks with any number of
stations. Two or more networks may exist side by side.
O
ODBC
The abbreviation for open database connectivity. This is a Microsoft
technology enabling database access.
OLE
The abbreviation for object linking and embedding. This is a Microsoft
technology enabling the linking of and data interchange between programs.
OLM
The abbreviation for optical link module. This is an element for connecting
the redundant FO cable of PROFIBUS to the components of PCS 7.
OM
The abbreviation for object manager. OMs manage objects persistently
stored there. Applications operate with these objects and execute operations on
them exclusively by invoking object methods.
Organization
block
Organization blocks (OB) form the interface between the operating system
of the AS CPU and the user program. The sequence for processing the user
program is specified in the organization blocks.
OS
Operator control and process monitoring system.
P
Parameter
A parameter is: 1. a variable of an S7 code block (current parameter,
formal parameter); 2. a variable for setting the behavior of a module. Each
parameterizable module has, when supplied, a meaningful basic setting which
can be changed by STEP 7.
PCS
Process control system.
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PLC
Programmable (logic) controller
PMC
Process monitoring and control. Communications mechanisms with
SIMATIC S5 and S7.
Process variable
The process variable is a resource-neutral (project-global) object. It serves
for linking the AS configuring world (STEP 7, CFC...) to the OS configuring
world (WinCC). It possesses information about the location at which the
process variable exists at runtime (e.g. network address in the AS) and
information on specific OS-relevant characteristics.
PROFIBUS
PROcess FIeld BUS, the European process and field bus standard defined in
the PROFIBUS standard (EN 50170). It specifies the functional, electrical and
mechanical characteristics for a bit-serial field bus. PROFIBUS is a bus system
for networking PROFIBUS-compatible automation systems and field devices at
the cell and field levels. PROFIBUS is available with the protocols DP (→
distributed I/O), FMS (→ fieldbus message specification) or TF (→
technological functions).
PROFIBUS-DP
The PROFIBUS bus system with the DP protocol. DP stands for distributed
I/O (periphery). The ET 200 distributed I/O system is based on standard
EN 50 170, Volume 2, PROFIBUS.
Programmable (logic)
A controller whose function is stored in the control unit in the form of a
program. Thus the configuration and wiring of the unit do not depend on the
function of the controller. The PLC has the structure of a computer; it consists
of a CPU with memory, input/output modules and internal bus system. The
I/Os and programming language are oriented to the requirements of the
control system.
Project
A project is a container for all objects of an automation solution, irrespective
of the number of stations, modules and their networking.
Q
R
Release
All products with an order number have a release; it indicates the version of
the product. The release is incremented with upward-compatible function
extensions, for production-related modifications (the use of new parts /
components) and for error corrections.
S
Segment
The bus cable between two terminating resistors forms a segment. A segment
contains 0 to 32 → stations. Segments can be linked via RS 485 repeaters.
SFB
Standard function block, a preprogrammed function block with a defined
application-specific function.
SFC
A sequential function chart serves for creating sequence controllers for
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SIMATIC S7. These can be visualized with the SFC visualization package on
the OS.
SIMATIC PCS 7
This is the name of the new control system based on SIMATIC S7.
Slave
A slave may only exchange data with the master upon request by the master.
Examples of slaves are all DP slaves such as the ET 200B, ET 200C, ET
200M, etc..
SPC/SQC
The abbreviation for statistical process control/statistical quality control.
Methods for quality control by acquiring and evaluating statistical values.
Standard function
blocks
These are blocks for the CFC which are provided by the SIMATIC PCS 7
libraries.
Start events
Start events are defined events such as faults or alarms and initiate
the operating system to start a corresponding organization block.
Startup
This is run through during the transition from the STOP state to the
RUN operating state. It can be initiated by a POWER ON or by the ES.
Station
A unit which can send, receive or amplify data via the bus, e.g. DP master,
DP slave, RS 485 repeater, active star coupler.
STEP 7
A programming language for creating user programs for SIMATIC S7
controllers.
Symbol
A symbol is a name defined by the user, taking syntax specifications into
account. This name can be used for programming and for operator control and
process monitoring according to the definition for which it stands (e.g.
variable, data type, jump label, block).
Example:
Operand: I 5.0, data type: BOOL, symbol: emergency-off button
Symbol table
A table for assigning symbols (→ name) to addresses for global data and
blocks. Example: Emergency-off (symbol), I 1.7 (address), controller (symbol),
SFB 24 (block).
System bus
This is the bus to which all components such as the AS, OS and ES are
connected and with which they exchange data with one other.
T
Terminating
resistor
A terminating resistor is a resistor for matching the line at the bus cable;
terminating resistors are required at the cable and segment ends. With
ET 200, the terminating resistors are switched on/off in the → bus
connector.
Type
A type represents a pattern for any number of entities and describes how
these entities are structured internally. All entities of a type follow the same
basic definition with respect to behavior and information structure (data
structure), but contain individual data.
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U
User function
block
A block type created by the user for utilization by the CFC. Block types are
created, for example, by SCL → Type.
User program
The user program contains the structure for the automation programs, as
well as the data for the signal processing with which a plant or process can be
controlled.
V
W
X
Y
Z
8
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