Series 90-30/20/Micro PLC CPU Instruction Set Reference Manual

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Series 90-30/20/Micro PLC CPU Instruction Set Reference Manual | Manualzz
GE Fanuc Automation
Programmable Control Products
Series 90™-30/20/Micro PLC
CPU Instruction Set
Reference Manual
GFK-0467M
May 2002
GFL-002
Warnings, Cautions, and Notes
as Used in this Publication
Warning
Warning notices are used in this publication to emphasize that hazardous voltages,
currents, temperatures, or other conditions that could cause personal injury exist in this
equipment or may be associated with its use.
In situations where inattention could cause either personal injury or damage to
equipment, a Warning notice is used.
Caution
Caution notices are used where equipment might be damaged if care is not taken.
Note
Notes merely call attention to information that is especially significant to understanding and
operating the equipment.
This document is based on information available at the time of its publication. While efforts
have been made to be accurate, the information contained herein does not purport to cover all
details or variations in hardware or software, nor to provide for every possible contingency in
connection with installation, operation, or maintenance. Features may be described herein
which are not present in all hardware and software systems. GE Fanuc Automation assumes no
obligation of notice to holders of this document with respect to changes subsequently made.
GE Fanuc Automation makes no representation or warranty, expressed, implied, or statutory
with respect to, and assumes no responsibility for the accuracy, completeness, sufficiency, or
usefulness of the information contained herein. No warranties of merchantability or fitness for
purpose shall apply.
The following are trademarks of GE Fanuc Automation North America, Inc.
Alarm Master
CIMPLICITY
CIMPLICITY 90–ADS
CIMSTAR
Field Control
GEnet
Genius
Helpmate
Logicmaster
Modelmaster
Motion Mate
ProLoop
PROMACRO
PowerMotion
PowerTRAC
Series 90
Series Five
Series One
Series Six
Series Three
VersaMax
VersaPro
VuMaster
Workmaster
©Copyright 1989–2002 GE Fanuc Automation North America, Inc.
All Rights Reserved.
Preface
This manual describes the system operation, fault handling, and Logicmaster 90™ programming
instructions for the Series 90™-30, Series 90-20 and Series 90 Micro programmable logic
controllers. Series 90-30 PLCs, Series 90-20 PLCs, and Series 90 Micro PLCs are members of the
Series 90 family of programmable logic controllers from GE Fanuc Automation.
Revisions to This Manual
•
Added the model 374 CPU, which supports connection to an Ethernet network through two
built-in 10BaseT/100BaseTx auto-negotiating full-duplex Ethernet ports. Models 364 (release
9.10 and later) and 374 are the only Series 90-30 CPUs that support Ethernet Global Data.
Note that the CPU374 is supported only by the Windows®-based programmers.
•
Other corrections and clarifications as necessary.
Related Publications
Logicmaster™ 90 Series 90™-30/20/Micro Programming Software User’s Manual (GFK-0466).
VersaPro™ Programming Software User’s Guide (GFK-1670)
CIMPLICITY® Machine Edition Getting Started (GFK-1868)
Series 90™-30 Programmable Controller Installation Manual (GFK-0356)
Series 90™-20 Programmable Controller Installation Manual (GFK-0551)
Series 90™-30 I/O Module Specifications Manual (GFK-0898)
Series 90™ Programmable Coprocessor Module and Support Software User’s Manual
(GFK-0255)
Series 90™ PCM Development Software (PCOP) User’s Manual (GFK-0487)
CIMPLICITY™ 90-ADS Alphanumeric Display System User’s Manual (GFK-0499)
CIMPLICITY™ 90-ADS Alphanumeric Display System Reference Manual (GFK-0641)
Series 90™-30 and 90-20 PLC Hand-Held Programmer User’s Manual (GFK-0402)
Power Mate APM for Series 90™-30 PLC—Standard Mode User’s Manual (GFK-0840)
Power Mate APM for Series 90™-30 PLC—Follower Mode User’s Manual (GFK-0781)
Motion Mate™ DSM302 for Series 90™-30 PLCs User’s Manual (GFK-1464)
Series 90™-30 High Speed Counter User’s Manual (GFK-0293)
Series 90™-30 Genius Communications Module User’s Manual (GFK-0412)
GFK-0467M
iii
Preface
Series 90™-30 Genius™ Bus Controller User’s Manual (GFK-1034)
Series 90™-70 FIP Bus Controller User’s Manual (GFK-1038)
Series 90™-30 FIP Remote I/O Scanner User’s Manual (GFK-1037)
Field Control™ Distributed I/O and Control System Genius™ Bus Interface Unit User’s Manual
(GFK-0825)
Series 90™ Micro Programmable Logic Controller User’s Manual (GFK-1065)
Series 90™ PLC Serial Communications User’s Manual (GFK-0582)
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Contents
Chapter 1
Introduction .........................................................................................................1-1
Chapter 2
System Operation ................................................................................................2-1
Section 1: PLC Sweep Summary......................................................................2-2
Standard Program Sweep .................................................................................................. 2-2
Sweep Time Calculation............................................................................................. 2-7
PLC Sweep Details..................................................................................................... 2-8
PCM Communications with the PLC (Models 331 and Higher).............................. 2-12
Digital Servo Module (DSM) Communications with the PLC....................................... 2-13
Standard Program Sweep Variations .............................................................................. 2-13
Constant Sweep Time Mode .................................................................................... 2-13
PLC Sweep When in STOP Mode ........................................................................... 2-14
Communication Window Modes.............................................................................. 2-14
Keylock Switch on 35x, 36x and 37x Series CPUs: Change Mode and Flash Protect ... 2-15
Section 2: Program Organization and User References/Data.....................2-17
Subroutine Blocks........................................................................................................... 2-18
Examples of Using Subroutine Blocks..................................................................... 2-18
How Blocks Are Called............................................................................................ 2-19
Execution Sequence in Programs Containing Subroutines ...................................... 2-19
Periodic Subroutines................................................................................................. 2-20
User References .............................................................................................................. 2-20
Nicknames ................................................................................................................ 2-22
Transitions and Overrides......................................................................................... 2-22
Retentiveness of Data ............................................................................................... 2-22
Data Types ...................................................................................................................... 2-23
System Status References ............................................................................................... 2-24
Function Block Structure ................................................................................................ 2-27
Format of Ladder Logic Relays................................................................................ 2-27
Format of Program Function Blocks (Instructions)................................................. 2-27
Function Block (Instruction) Parameters ........................................................................ 2-29
Power Flow In and Out of a Function ...................................................................... 2-30
Section 3: Power-Up and Power-Down Sequences.......................................2-32
Power-Up ........................................................................................................................ 2-32
Power-Down ................................................................................................................... 2-35
Section 4: Clocks and Timers .........................................................................2-36
Elapsed Time Clock........................................................................................................ 2-36
Time-of-Day Clock......................................................................................................... 2-36
Watchdog Timer ............................................................................................................. 2-37
Elapsed Power Down Timer ........................................................................................... 2-37
Constant Sweep Timer .................................................................................................... 2-37
Time-Tick Contacts ........................................................................................................ 2-38
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Section 5: System Security................................................................................2-39
Passwords........................................................................................................................ 2-39
Privilege Level Change Requests ................................................................................... 2-40
Locking/Unlocking Subroutines ..................................................................................... 2-40
Permanently Locking a Subroutine .......................................................................... 2-40
Section 6: Series 90-30, 90-20, and Micro I/O System..................................2-41
Series 90-30 I/O Modules ............................................................................................... 2-42
I/O Data Formats............................................................................................................. 2-44
Default Conditions for Series 90-30 Output Modules .................................................... 2-44
Diagnostic Data............................................................................................................... 2-45
Global Data ..................................................................................................................... 2-45
Genius Global Data .................................................................................................. 2-45
Ethernet Communications ........................................................................................ 2-45
Series 90-20 I/O Modules......................................................................................... 2-46
Configuration and Programming .................................................................................... 2-46
Chapter 3
Fault Explanation and Correction .....................................................................3-1
Section 1: Fault Handling ..................................................................................3-2
Alarm Processor................................................................................................................ 3-2
Classes of Faults ............................................................................................................... 3-2
System Reaction to Faults................................................................................................. 3-3
Fault Tables ................................................................................................................ 3-3
Fault Action................................................................................................................ 3-4
Fault References................................................................................................................ 3-4
System Status References ................................................................................................. 3-4
Additional Fault Effects.................................................................................................... 3-5
PLC Fault Table Display................................................................................................... 3-5
I/O Fault Table Display..................................................................................................... 3-5
Accessing Additional Fault Information........................................................................... 3-6
Section 2: PLC Fault Table Explanations........................................................3-7
Fault Actions..................................................................................................................... 3-8
Loss of, or Missing, Option Module .......................................................................... 3-8
Reset of, Addition of, or Extra, Option Module......................................................... 3-8
System Configuration Mismatch................................................................................ 3-9
Option Module Software Failure.............................................................................. 3-10
Program Block Checksum Failure............................................................................ 3-10
Low Battery Signal................................................................................................... 3-10
Constant Sweep Time Exceeded .............................................................................. 3-11
Application Fault ...................................................................................................... 3-11
No User Program Present ......................................................................................... 3-12
Corrupted User Program on Power-Up .................................................................... 3-12
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Password Access Failure .......................................................................................... 3-12
PLC CPU System Software Failure ......................................................................... 3-13
Communications Failure During Store..................................................................... 3-15
Section 3: I/O Fault Table Explanations ........................................................3-16
Loss of I/O Module......................................................................................................... 3-16
Addition of I/O Module .................................................................................................. 3-17
Chapter 4
Relay Functions ...................................................................................................4-1
Using Contacts .................................................................................................................. 4-1
Using Coils ....................................................................................................................... 4-2
Normally Open Contact —| |—........................................................................................ 4-3
Normally Closed Contact —|/|— ..................................................................................... 4-3
Coil —( )— ...................................................................................................................... 4-3
Example...................................................................................................................... 4-3
Negated Coil —(/)—........................................................................................................ 4-4
Example...................................................................................................................... 4-4
Retentive Coil —(M)— ................................................................................................... 4-4
Negated Retentive Coil —(/M)—.................................................................................... 4-4
Positive Transition Coil —(↑)— ..................................................................................... 4-4
Negative Transition Coil —(↓)—.................................................................................... 4-5
Example...................................................................................................................... 4-5
SET Coil —(S) —............................................................................................................ 4-5
RESET Coil —(R)— ....................................................................................................... 4-5
Example...................................................................................................................... 4-6
Retentive SET Coil —(SM)—......................................................................................... 4-6
Retentive RESET Coil —(RM)— ................................................................................... 4-6
Links ................................................................................................................................. 4-7
Example...................................................................................................................... 4-7
Continuation Coils (———<+>) and Contacts (<+>———).......................................... 4-8
Chapter 5
Timers and Counters...........................................................................................5-1
Function Block Data Required for Timers and Counters.................................................. 5-1
ONDTR............................................................................................................................. 5-3
Parameters .................................................................................................................. 5-4
Valid Memory Types.................................................................................................. 5-4
Example...................................................................................................................... 5-5
TMR.................................................................................................................................. 5-5
Parameters .................................................................................................................. 5-6
Valid Memory Types.................................................................................................. 5-6
Example...................................................................................................................... 5-7
OFDT ................................................................................................................................ 5-8
Parameters .................................................................................................................. 5-9
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Valid Memory Types................................................................................................ 5-10
Examples .................................................................................................................. 5-10
UPCTR............................................................................................................................ 5-11
Parameters ................................................................................................................ 5-11
Valid Memory Types................................................................................................ 5-12
Examples .................................................................................................................. 5-12
DNCTR ........................................................................................................................... 5-13
Parameters ................................................................................................................ 5-13
Valid Memory Types................................................................................................ 5-14
Examples .................................................................................................................. 5-14
Inventory Count Examples ....................................................................................... 5-15
Chapter 6
Math Functions....................................................................................................6-1
Standard Math Functions (ADD, SUB, MUL, DIV) ........................................................ 6-2
Parameters .................................................................................................................. 6-3
Valid Memory Types.................................................................................................. 6-3
Math Function Examples............................................................................................ 6-4
Math Functions and Data Types................................................................................. 6-5
Example...................................................................................................................... 6-6
MOD (INT, DINT) ....................................................................................................... 6-7
Parameters .................................................................................................................. 6-7
Valid Memory Types.................................................................................................. 6-8
Example...................................................................................................................... 6-8
SQRT (INT, DINT, REAL) .......................................................................................... 6-9
Parameters .................................................................................................................. 6-9
Valid Memory Types................................................................................................ 6-10
Examples .................................................................................................................. 6-10
Trig Functions (SIN, COS, TAN, ASIN, ACOS, ATAN) .......................................... 6-11
Parameters ................................................................................................................ 6-12
Valid Memory Types................................................................................................ 6-12
Example.................................................................................................................... 6-12
Logarithmic/Exponential Functions (LOG, LN, EXP, EXPT) ....................................... 6-13
Parameters ................................................................................................................ 6-13
Valid Memory Types................................................................................................ 6-14
Example.................................................................................................................... 6-14
Radian Conversion (RAD, DEG)................................................................................ 6-15
Parameters ................................................................................................................ 6-15
Valid Memory Types................................................................................................ 6-15
Example.................................................................................................................... 6-16
Chapter 7
Relational Functions............................................................................................7-1
Standard Relational Functions (EQ, NE, GT, GE, LT, LE).............................................. 7-2
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Parameters .................................................................................................................. 7-2
Expanded Description ................................................................................................ 7-3
Valid Memory Types.................................................................................................. 7-3
Example...................................................................................................................... 7-3
RANGE (INT, DINT, WORD)..................................................................................... 7-4
Parameters .................................................................................................................. 7-5
Valid Memory Types.................................................................................................. 7-5
Example 1................................................................................................................... 7-5
Example 2................................................................................................................... 7-6
Chapter 8
Bit Operation Functions .....................................................................................8-1
AND and OR (WORD)..................................................................................................... 8-3
Parameters .................................................................................................................. 8-3
Valid Memory Types.................................................................................................. 8-4
Example...................................................................................................................... 8-4
XOR (WORD) .................................................................................................................. 8-5
Parameters .................................................................................................................. 8-5
Valid Memory Types.................................................................................................. 8-6
Example of an Alarm Circuit Using an XOR............................................................. 8-6
NOT (WORD) .................................................................................................................. 8-7
Parameters .................................................................................................................. 8-7
Valid Memory Types.................................................................................................. 8-7
Example...................................................................................................................... 8-7
SHL and SHR (WORD).................................................................................................... 8-8
Parameters .................................................................................................................. 8-9
Valid Memory Types.................................................................................................. 8-9
Example...................................................................................................................... 8-9
ROL and ROR (WORD)................................................................................................. 8-10
Parameters ................................................................................................................ 8-10
Valid Memory Types................................................................................................ 8-11
Example.................................................................................................................... 8-11
BTST (WORD)............................................................................................................... 8-12
Parameters ................................................................................................................ 8-12
Valid Memory Types................................................................................................ 8-13
Example.................................................................................................................... 8-13
BSET and BCLR (WORD)............................................................................................. 8-14
Parameters ................................................................................................................ 8-14
Valid Memory Types................................................................................................ 8-15
Examples .................................................................................................................. 8-15
BPOS (WORD)............................................................................................................... 8-16
Parameters ................................................................................................................ 8-16
Valid Memory Types................................................................................................ 8-17
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Example.................................................................................................................... 8-17
MSKCMP (WORD, DWORD)....................................................................................... 8-18
Parameters ................................................................................................................ 8-19
Valid Memory Types................................................................................................ 8-19
Example 1 – MSKCMP Instruction ......................................................................... 8-20
Example 2 - Fault Detection with a Masked Compare Function.............................. 8-21
Chapter 9
Data Move Functions ..........................................................................................9-1
MOVE (BIT, INT, WORD, REAL) ................................................................................. 9-2
Parameters .................................................................................................................. 9-3
Example 1 - Overlapping Addresses (only for CPUs 311-341) ................................ 9-4
Example 2 – for all CPUs........................................................................................... 9-4
BLKMOV (INT, WORD, REAL) .................................................................................... 9-5
Parameters .................................................................................................................. 9-5
Valid Memory Types.................................................................................................. 9-6
Example...................................................................................................................... 9-6
BLKCLR (WORD)........................................................................................................... 9-7
Parameters .................................................................................................................. 9-7
Valid Memory Types.................................................................................................. 9-7
Example...................................................................................................................... 9-7
SHFR (BIT, WORD) ........................................................................................................ 9-8
Parameters .................................................................................................................. 9-9
Valid Memory Types.................................................................................................. 9-9
Example 1................................................................................................................. 9-10
Example 2................................................................................................................. 9-10
BITSEQ (BIT) ............................................................................................................ 9-11
Control Block Memory Required for a Bit Sequencer ............................................. 9-12
Parameters ................................................................................................................ 9-13
Valid Memory Types................................................................................................ 9-13
Example.................................................................................................................... 9-14
COMMREQ.................................................................................................................... 9-15
Command Block....................................................................................................... 9-15
Parameters ................................................................................................................ 9-16
Valid Memory Types................................................................................................ 9-16
Example.................................................................................................................... 9-17
Chapter 10
Table Functions .................................................................................................10-1
ARRAY_MOVE (INT, DINT, BIT, BYTE, WORD) .................................................... 10-2
Arrays and Data Elements Defined .......................................................................... 10-2
Index Numbers ......................................................................................................... 10-2
The Array Move Instruction..................................................................................... 10-2
Parameters ................................................................................................................ 10-4
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Valid Memory Types................................................................................................ 10-4
Example 1................................................................................................................. 10-5
Example 2................................................................................................................. 10-5
Example 3................................................................................................................. 10-6
Search Functions............................................................................................................. 10-7
Parameters ................................................................................................................ 10-8
Valid Memory Types................................................................................................ 10-8
Example 1................................................................................................................. 10-9
Example 2............................................................................................................... 10-10
Chapter 11
Conversion Functions........................................................................................11-1
—>BCD-4 (INT) ............................................................................................................ 11-2
Parameters ................................................................................................................ 11-2
Valid Memory Types................................................................................................ 11-2
Example.................................................................................................................... 11-2
—>INT (BCD-4, REAL) ............................................................................................ 11-3
Parameters ................................................................................................................ 11-3
Valid Memory Types................................................................................................ 11-3
Example 1 – BCD4 to Integer ................................................................................. 11-4
Example 2 – Real to Integer ..................................................................................... 11-4
—>DINT (REAL)........................................................................................................... 11-5
Parameters ................................................................................................................ 11-5
Valid Memory Types................................................................................................ 11-5
Example.................................................................................................................... 11-6
—>REAL (INT, DINT, BCD-4, WORD) ..................................................................... 11-7
Parameters ................................................................................................................ 11-7
Valid Memory Types................................................................................................ 11-7
Example 1 - Integer to Real Conversion .................................................................. 11-8
Example 2 – Double Integer to Real Conversion ..................................................... 11-8
—>WORD (REAL) ........................................................................................................ 11-9
Parameters ................................................................................................................ 11-9
Valid Memory Types................................................................................................ 11-9
Example – Real to Word Conversion..................................................................... 11-10
TRUN (INT, DINT)...................................................................................................... 11-11
Parameters .............................................................................................................. 11-11
Valid Memory Types.............................................................................................. 11-11
Example 1 – Truncate Real to Integer with Output Coil for CPU352.................... 11-12
Example 2 – Truncate Real to Double Integer with Output Coil for CPU352....... 11-12
Chapter 12
Control Functions..............................................................................................12-1
CALL .............................................................................................................................. 12-2
Example.................................................................................................................... 12-2
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Contents
DOIO............................................................................................................................... 12-3
Parameters ................................................................................................................ 12-4
Valid Memory Types................................................................................................ 12-4
Input Example 1 ....................................................................................................... 12-5
Input Example 2 ....................................................................................................... 12-5
Output Example 1..................................................................................................... 12-6
Output Example 2..................................................................................................... 12-6
Enhanced DO I/O Function for 331 and Later CPUs ..................................................... 12-7
SER (Sequential Event Recorder)................................................................................... 12-8
Parameters ................................................................................................................ 12-9
Valid Memory Types................................................................................................ 12-9
Function Control Block .......................................................................................... 12-10
Status Extra Data States.......................................................................................... 12-12
SER Data Block Format ......................................................................................... 12-13
SER Operation........................................................................................................ 12-13
Sampling Modes..................................................................................................... 12-14
SER Function Block Trigger Timestamp Formats ................................................. 12-17
SER Example ......................................................................................................... 12-18
END .............................................................................................................................. 12-23
Example.................................................................................................................. 12-23
MCRN/MCR................................................................................................................. 12-24
Overview of MCR and MCRN............................................................................... 12-24
CPU Compatibility ................................................................................................. 12-25
Nesting an MCRN .................................................................................................. 12-25
MCR Operation ...................................................................................................... 12-26
Parameters .............................................................................................................. 12-26
Differences Between MCR/MCRN and JUMP...................................................... 12-27
Example 1............................................................................................................... 12-28
Example 2............................................................................................................... 12-29
ENDMCRN/ENDMCR ................................................................................................ 12-30
Example.................................................................................................................. 12-30
JUMP ............................................................................................................................ 12-31
Examples ................................................................................................................ 12-32
LABEL.......................................................................................................................... 12-33
Example.................................................................................................................. 12-33
COMMENT .................................................................................................................. 12-34
SVCREQ....................................................................................................................... 12-35
SVC REQ Overview............................................................................................... 12-36
SVCREQ #1: Change/Read Constant Sweep Timer ............................................. 12-38
SVCREQ #2: Read Window Values ..................................................................... 12-41
SVCREQ #3: Change Programmer Communications Window Mode and Timer Value12-43
SVCREQ #4: Change System Comm Window Mode and Timer Value .............. 12-45
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SVCREQ #6: Change/Read Number of Words to Checksum.............................. 12-47
SVCREQ #7: Change/Read Time-of-Day Clock .................................................. 12-49
SVCREQ #8: Reset Watchdog Timer ................................................................... 12-53
SVCREQ #9: Read Sweep Time from Beginning of Sweep................................. 12-54
SVCREQ #10: Read Folder Name ........................................................................ 12-55
SVCREQ #11: Read PLC ID ................................................................................ 12-56
SVCREQ #12: Read PLC Run State ..................................................................... 12-57
SVCREQ #13: Shut Down (Stop) PLC................................................................. 12-58
SVCREQ #14: Clear Fault Tables......................................................................... 12-59
SVCREQ #15: Read Last-Logged Fault Table Entry ........................................... 12-60
SVCREQ #16: Read Elapsed Time Clock ............................................................ 12-64
SVCREQ #18: Read I/O Override Status.............................................................. 12-65
SVCREQ #23: Read Master Checksum ................................................................ 12-66
SVCREQ #24: Reset Smart Module ..................................................................... 12-67
SVCREQ #26/30: Interrogate I/O ......................................................................... 12-68
SVCREQ #29: Read Elapsed Power Down Time ................................................. 12-69
SVCREQ #45: Skip Next Output & Input Scan.................................................... 12-70
SVCREQ #46: Fast Backplane Status Access....................................................... 12-71
SVCREQ #48: Reboot After Fatal Fault Auto Reset ............................................ 12-77
SVCREQ 49 Auto Reset Statistics ......................................................................... 12-79
PID ................................................................................................................................ 12-80
Parameters .............................................................................................................. 12-81
Valid Memory Types.............................................................................................. 12-81
PID Parameter Block.............................................................................................. 12-82
Operation of the PID Instruction ............................................................................ 12-84
Appendix A
Instruction Timing ............................................................................................. A-1
CPU Boolean Execution Times............................................................................... A-15
Instruction Sizes for CPUs 350 - 374 ...................................................................... A-15
Appendix B
Interpreting Fault Tables .................................................................................. B-1
PLC Fault Table............................................................................................................... B-1
Example..................................................................................................................... B-2
I/O Fault Table................................................................................................................. B-8
Appendix C
Instruction Mnemonics ...................................................................................... C-1
Appendix D
Key Functions ..................................................................................................... D-1
Appendix E
Using Floating-Point Numbers.......................................................................... E-1
Floating-Point Numbers .............................................................................................E-1
Real Number Terminology.........................................................................................E-2
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Internal Format of Floating-Point Numbers ...............................................................E-3
Values of Floating-Point Numbers.............................................................................E-4
Entering and Displaying Floating-Point Numbers .....................................................E-5
Errors in Floating-Point Numbers and Operations .....................................................E-6
Appendix F
xiv
Programming Software Comparison................................................................ F-1
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Figure 2-1. PLC Sweep.................................................................................................................................. 2-3
Figure 2-2. Programmer Communications Window Flow Chart................................................................. 2-10
Figure 2-3. System Communications Window Flow Chart......................................................................... 2-11
Figure 2-4. PCM Communications with the PLC........................................................................................ 2-12
Figure 2-5. Power-Up Sequence................................................................................................................. 2-33
Figure 2-6. Time-Tick Contact Timing Diagram ........................................................................................ 2-38
Figure 2-7. Series 90-30 I/O Structure ....................................................................................................... 2-41
Figure 2-8. Series 90-30 I/O Modules ......................................................................................................... 2-42
Figure 12-1. Example of Pre-Trigger SER Sampling (for 512 Samples) ................................................. 12-15
Figure 12-2. Example of Mid-Trigger SER Sampling (for 512 Samples)................................................ 12-15
Figure 12-3. Post-Trigger SER Sampling (for 512 samples)................................................................... 12-16
Figure 12-4. Independent Term Algorithm (PIDIND) ............................................................................. 12-89
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Table 2-1. Sweep Time Contribution ........................................................................................................... 2-4
Table 2-2. I/O Scan Time Contributions (in milliseconds) for Series 90-30 35x, 36x and 37x CPUs.......... 2-5
Table 2-3. I/O Scan Time Contributions (in milliseconds) for the Series 90-30 CPU311 through CPU341 2-6
Table 2-4. Register References.................................................................................................................... 2-20
Table 2-5. Discrete References.................................................................................................................... 2-21
Table 2-6. Data Types ................................................................................................................................. 2-23
Table 2-7. System Status References........................................................................................................... 2-24
Table 2-8. Series 90-30 I/O Modules - Continued....................................................................................... 2-43
Table 2-8. Series 90-30 I/O Modules - Continued....................................................................................... 2-44
Table 3-1. Fault Summary ............................................................................................................................. 3-3
Table 3-2. Fault Actions ............................................................................................................................... 3-4
Table 4-1. Types of Contacts....................................................................................................................... 4-1
Table 4-2. Types of Coils ............................................................................................................................ 4-2
Table 12-1. Function Control Block for SER Example............................................................................ 12-19
Table 12-2. Sample Contents for SER Example....................................................................................... 12-21
Table 12-3. Data Block for SER Control Block Example ........................................................................ 12-21
Table 12-4. Service Request Functions .................................................................................................... 12-35
Table 12-5. Parameter Block for Read Extra Data Function .................................................................... 12-72
Table 12-6. Parameter Block for Write Data Function............................................................................. 12-73
Table 12-7. Parameter Block for Read/Write Data Function ................................................................... 12-74
Table 12-8. Error Codes ........................................................................................................................... 12-75
Table 12-9. Parameter Block for Reboot after Fatal Fault ....................................................................... 12-78
Table 12-10. Return Status Definitions for Reboot after Fatal Fault........................................................ 12-78
Table 12-11. Parameter Block for Auto Reset Statistics .......................................................................... 12-79
Table 12-12. Return Status Definitions for Auto Reset Statistics ............................................................ 12-79
Table 12-13. PID Parameters Overview ................................................................................................... 12-82
Table 12-13. PID Parameters Overview - Continued ............................................................................... 12-83
Table 12-14. PID Parameter Details......................................................................................................... 12-85
Table 12-14. PID Parameter Details - Continued ..................................................................................... 12-86
Table 12-14. PID Parameter Details - Continued ..................................................................................... 12-87
Table A-1. Instruction Timing, Standard Models....................................................................................... A-2
Table A-1. Instruction Timing, Standard Models-Continued...................................................................... A-3
Table A-1. Instruction Timing, Standard Models-Continued..................................................................... A-4
Table A-1. Instruction Timing, Standard Models-Continued...................................................................... A-5
Table A-2. Instruction Timing, 35x-36x Models......................................................................................... A-6
Table A-2. Instruction Timing, 35x-36x Models-Continued....................................................................... A-7
xvi
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual–May 2002
GFK-0467M
Contents
Table A-2. Instruction Timing, 35x-36x Models-Continued....................................................................... A-8
Table A-2. Instruction Timing, 35x-36x Models-Continued....................................................................... A-9
Table A-3. SER Function Block Timing ................................................................................................... A-10
Table A-4. Instruction Timing, 37x Models .............................................................................................. A-11
Table A-43. Instruction Timing, 37x Models-Continued .......................................................................... A-12
Table A-4. Instruction Timing, 37x Models-Continued ............................................................................ A-13
Table A-4. Instruction Timing, 37x Models-Continued ............................................................................ A-14
Table B-1. PLC Fault Groups...................................................................................................................... B-4
Table B-2. PLC Fault Actions ..................................................................................................................... B-5
Table B-3. Alarm Error Codes for PLC CPU Software Faults.................................................................... B-5
Table B-4. Alarm Error Codes for PLC Faults............................................................................................ B-6
Table B-5. PLC Fault Data – Illegal Boolean Opcode Detected ................................................................. B-7
Table B-6. PLC Fault Time Stamp .............................................................................................................. B-7
Table B-7. I/O Fault Table Format Indicator Byte ...................................................................................... B-9
Table B-8. I/O Reference Address............................................................................................................... B-9
Table B-9. I/O Reference Address Memory Type....................................................................................... B-9
Table B-10. I/O Fault Groups.................................................................................................................... B-10
Table B-11. I/O Fault Actions ................................................................................................................... B-11
Table B-12. I/O Fault Specific Data .......................................................................................................... B-11
Table B-13. I/O Fault Time Stamp ............................................................................................................ B-12
Table E-1. General Case of Power Flow for Floating-Point Math Operations.............................................E-8
GFK-0467M
Contents
xvii
Chapter
Introduction
1
The Series 90-30, 90-20, and Micro PLCs are members of the GE Fanuc Series 90 family of
Programmable Logic Controllers (PLCs). They are easy to install and configure, offer advanced
programming features, and are compatible with the Series 90-70 PLCs.
The 341 and lower Series 90-30 PLCs and Series 90-20 PLC use an 80188 microprocessor. The
35x and 36x series of 90-30 PLCs use an 80386EX microprocessor. The 37x series of 90-30 PLCs
use a 586 microprocessor. The Series 90 Micro PLC uses the H8 microprocessor. Both program
execution and basic housekeeping tasks such as diagnostic routines, input/output scanners, and
alarm processing are supported. The system firmware also contains routines to communicate with
the programmer. These routines provide for the upload and download of application programs,
return of status information, and control of the PLC.
In the Series 90-30 PLC, the application (user logic) program that controls the end process to which
the PLC is applied is controlled by a dedicated Instruction Sequencer Coprocessor (ISCP). The
ISCP is implemented in hardware in the Model 313 and higher and in software in the Model 311
systems, and the Micro PLC. The microprocessor and the hardware-based ISCP can execute
simultaneously, allowing the microprocessor to service communications while the ISCP is
executing the bulk of the application program; however, the microprocessor must execute the nonBoolean function blocks.
Faults occur in the Series 90-30 PLC, Series 90-20 PLC, and the Micro PLC when certain failures
or conditions happen that affect the operation and performance of the system. These conditions
may affect the ability of the PLC to control a machine or process. Other conditions may only act as
an alert, such as a low battery signal to indicate that the voltage of the battery protecting the
memory is low and should be replaced. The condition or failure is called a fault.
Faults are handled by a software alarm processor function that records the faults in either the PLC
fault table or the I/O fault table. (Model 331 and higher CPUs also time-stamp the faults.) These
tables can be displayed through the programming software on the PLC Fault Table and I/O Fault
Table screens in Logicmaster 90-30/20/Micro software using the control and status functions.
Note
Floating-point capabilities are only supported on the 35x and 36x series CPUs
Release 9 or later, and on all releases of CPU352 and CPU374.
The CPU364 (release 9.10 or later) and the CPU374 are the only Series 90-30
CPUs that support Ethernet Global Data (EGD).
GFK-0467M
1-1
1
The Series 90-20 PLC provides a cost-effective platform for low I/O count applications. The
primary objectives of the Series 90-20 PLC are as follows:
•
To provide a small PLC that is easy to use, install, upgrade, and maintain.
•
To provide a cost-effective family-compatible PLC.
•
To provide easier system integration through standard communication hardware and protocols.
The Series 90 Micro PLC also provides a cost-effective platform for lower I/O count applications.
The primary objectives of the Micro PLC are the same as those for the Series 90-20. In addition,
the Micro offers the following:
•
The Micro PLC has the CPU, power supply, inputs and outputs all built into one compact
device.
•
Most models also have a high speed counter.
•
Because the CPU, power supply, and inputs and outputs are all built into one device, it is very
easy to configure.
Note
For additional information, see the appendices in the back of this manual.
•
Appendix A lists the memory size in bytes and the execution time in
microseconds for each programming instruction.
•
Appendix B describes how to interpret the message structure format when
reading the PLC and I/O fault tables.
•
Appendix C lists instruction mnemonics for searching or editing a program.
•
Appendix D lists the special keyboard assignments used in the Logicmaster
90-30/20/Micro Software.
•
Appendix E describes the use of floating-point math operations.
Note to Windows-Based PLC Programming Software Users
This manual was written for Logicmaster (a DOS-based PLC programming software) users. The
Windows-based PLC software products, such as CIMPLICITY® Machine Edition Logic Developer
and VersaPro®, provide PLC instruction set information in the software’s built-in on-line help
system rather than in a manual. Users of the Windows-based programming software should be
aware that instructions appear differently from the way they appear on a Logicmaster screen (they
still work the same in the PLC). The online help system has the most accurate information about
using the instruction set in the Windows-based programming software. For a summary of major
differences between the two software types, refer to Appendix F.
1-2
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
Chapter
System Operation
2
This chapter describes certain system operations of the Series 90-30, 90-20, and Micro PLC
systems. These system operations include:
GFK-0467M
•
A summary of PLC sweep sequences (Section 1).....................................................2-2
•
Program organization and user references/data (Section 2)....................................2-17
•
Power-up and power-down sequences (Section 3) .................................................2-31
•
Clocks and timers (Section 4) .................................................................................2-35
•
System security through password assignment (Section 5).....................................2-38
•
Series 90-30 I/O modules (Section 6).....................................................................2-40
2-1
2
Section 1: PLC Sweep Summary
The logic program in the Series 90-30, 90-20, and Micro PLCs executes repeatedly until stopped by
a command from the programmer or a command from another device. The sequence of operations
necessary to execute a program one time is called a sweep. In addition to executing the logic
program, the sweep includes obtaining data from input devices, sending data to output devices,
performing internal housekeeping, servicing the programmer, and servicing other communications.
Series 90-30, 90-20, and Micro PLCs normally operate in STANDARD PROGRAM SWEEP mode.
Other operating modes include STOP WITH I/O DISABLED mode, STOP WITH I/O
ENABLED mode, and CONSTANT SWEEP mode. Each of these modes, described in this chapter,
is controlled by external events and application configuration settings. The PLC makes the decision
regarding its operating mode at the start of every sweep.
Standard Program Sweep
STANDARD PROGRAM SWEEP mode normally runs under all conditions. The CPU operates by
executing an application program, updating I/O, and performing communications and other tasks.
This occurs in a repetitive cycle called the CPU sweep. There are seven parts to the execution
sequence of the Standard Program Sweep:
2-2
1.
Start-of-sweep housekeeping
2.
Input scan (read inputs)
3.
Application program logic solution
4.
Output scan (update outputs)
5.
Programmer communications
6.
System communications
7.
Diagnostics
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
2
All of these steps execute every sweep. Although the Programmer Communications Window opens
each sweep, programmer services only occur if a board fault has been detected or if the
programming device issues a service request; that is, the Programmer Communications Window
first checks for work to do and exits if there is none. The sequence of the standard program sweep is
shown in the following figure.
a43064A
START-OF-SWEEP
HOUSEKEEPING
I/O
ENABLED
?
HOUSEKEEPING
NO
YES
DATA
INPUT
INPUT SCAN
RUN
MODE
?
NO
YES
LOGIC SOLUTION
I/O
ENABLED
?
YES
OUTPUT SCAN
PROGRAMMER
COMMUNICATIONS
SYSTEM
COMMUNICATIONS
PROGRAM
EXECUTION
SCAN
TIME
OF
PLC
NO
DATA
OUTPUT
PROGRAMMER
COMMUNICATIONS
SYSTEM
COMMUNICATIONS
RECONFIGURATION
USER PROGRAM
CHECKSUM
CALCULATION
CHECKSUM
CALCULATION
START NEXT SWEEP
Figure 2-1. PLC Sweep
GFK-0467M
Chapter 2 System Operation
2-3
2
As shown in the PLC sweep sequence, several items are included in the sweep. These items
contribute to the total sweep time as shown in the following table.
Table 2-1. Sweep Time Contribution
Sweep Element
Description
•
Calculate sweep time
•
Schedule start of next sweep
•
Determine mode of next
sweep
•
Update fault reference tables
•
Reset watchdog timer
Housekeeping
2-4
Time Contribution (milliseconds) 4
Micro
211
311/313
0.714
331
34x
0.705
0.424
35x/36x
0.368
0.898
0.279
See Tables 2-2 and 2-3 for scan time contributions
37x
0.027
Data Input
Input data is received from input and
option modules
Note 5
Program
Execution
User logic is solved
Execution time is dependent upon the length of the program and the
types of instructions used in the program. Instruction execution times
are listed in Appendix A.
Data Output
Output data is sent to output and
option modules
1.656
See Tables 2-2 and 2-3 for scan time contributions
Service requests
from programming
devices and
intelligent modules
are processed1
HHP
1.93
6.526
4.426
4.524
2.476
0.334
N/A
Programmer and
System
Communications
Programmer
0.380
3.536
2.383
2.454
1.248
0.517
0.026
PCM2
N/A
N/A
N/A
3.337
1.943
0.482
0.029
Reconfiguration
Slots with faulted modules and
empty slots are monitored
N/A6
N/A
0.458
0.639
0.463
0.319
0.243
Diagnostics
Verify user program integrity (time
contribution is the time required per
word checksummed each sweep) 3
N/A7
0.083
0.050
0.048
0.031
0.010
0.022
1.
The scan time contribution of external device service is dependent upon the mode of the communications window in
which the service is processed. If the window mode is LIMITED, a maximum of 8 milliseconds for the 311, 313, 323,
and 331 CPUs and 6 milliseconds for the 340 and higher CPUs will be spent during that window. If the window mode
is RUN-TO-COMPLETION, a maximum of 50 milliseconds can be spent in that window, depending upon the number
of requests which are presented simultaneously.
2.
These measurements were taken with the PCM physically present but not configured and with no application task
running on the PCM.
3.
The number of words checksummed each sweep can be changed with the SVCREQ function block.
4.
These measurements were taken with an empty program and the default configuration. The Series 90-30 PLCs were in
an empty 10-slot rack with no extension racks connected. Also, the times in this table assume that there is no periodic
subroutine active; the times will be longer if a periodic subroutine is active.
5.
The data input time for the Micro PLC can be determined as follows: 0.365ms (fixed scan) + 0.036ms (filter time) x
(total sweep time) / 0.5ms.
6.
Since the Micro PLC has a static set of I/O, reconfiguration is not necessary.
7.
Since the user program for the Micro PLC is in Flash memory, it will not be checked for integrity.
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
2
Table 2-2. I/O Scan Time Contributions (in milliseconds) for Series 90-30 35x, 36x and 37x CPUs
35x and 36x Series CPUs
Module Type
8-point discrete input
16-point discrete input
32-point discrete input
8-point discrete output
16-point discrete output
32-point discrete output
Combination discrete input/output
4-channel analog input
2-channel analog output
16-channel analog input
(current or voltage)
8-channel analog output
Combination analog input/output
High Speed Counter
I/O Processor
Ethernet Interface (no connection)
Power Mate APM (1-axis)
Power Mate APM (2-axis)
DSM 302 *
40 AI, 6 AQ
50AI, 9 AQ
64 AI, 12 AQ
DSM314 *
1 Axis Configured
2 Axes Configured
3 Axes Configured
4 Axes Configured
GCM
GCM+
GBC
PCM 311
8 32-bit devices
no devices
32 64-word devices
no devices
16 64-word devices
not configured, or no
application task
running 20Kb application
program
ADC (no task)
I/O Link
no devices
Master
sixteen 64-point devices
I/O Link
32-point
Slave
64-point
Main Expansion Remote
Rack
Rack
Rack
37x Series CPUs
Main
Rack
Expansion
Rack
Remote
Rack
.030
.030
.043
.030
.030
.042
.060
.075
.058
.978
.055
.055
.073
.053
.053
.070
.112
.105
.114
1.446
.206
.206
.269
.197
.197
.259
.405
.396
.402
3.999
.030
.030
.048
.024
.030
.047
.052
.085
.046
.423
.055
.055
.075
.052
.052
.069
.110
.109
.101
.700
.206
.206
.272
.198
.199
.258
.408
.403
.393
1.741
1.274
1.220
1.381
1.574
.7129
1.527
1.807
2.143
2.427
2.864
1.6
2.2
2.8
3.3
1.988
1.999
2.106
2.402
2.067
2.581
2.864
3.315
3.732
4.317
2.6
3.8
4.3
5.2
4.472
4.338
5.221
6.388
3.681
6.388
7.805
9.527
11.092
13.138
6.9
9.9
13.0
15.9
.873
.862
1.142
1.270
.426
1.236
1.539
1.801
2.075
2.441
1.330
1.888
2.421
2.969
1.492
1.487
1.808
2.125
.795
2.073
2.439
2.963
3.373
3.931
2.337
3.148
3.953
4.761
3.635
4.103
5.234
6.269
2.302
6.032
7.369
9.275
10.840
12.881
6.905
9.917
12.929
15.982
8.826
.567
19.497
.798
29.976
.476
16.932
.866
25.588
1.202
40.570
N/A
21.179
1.830
80.871
2.540
131.702
N/A
7.386
.457
17.036
.544
26.976
.195
9.520
.759
24.390
.908
38.564
N/A
20.591
1.743
80.044
2.209
130.639
N/A
1.746
N/A
N/A
.538
N/A
N/A
.476
.569
4.948
.087
.154
N/A
.865
7.003
.146
.213
N/A
1.932
19.908
.553
.789
.193
.996
5.924
.095
.165
N/A
1.618
8.240
.149
.219
N/A
3.749
26.637
.540
.803
* For applications where the DSM’s contributions to scan time will affect machine operation you
may need to use the Do I/O function block, and the Suspend I/O and Fast Backplane Status Access
service requests to transfer necessary data to and from the Motion module without getting all the
data every scan. For the DSM302, refer to the Motion Mate DSM302 for Series 90-30 PLCs
User’s Manual, GFK1464 for details. For the DSM314, refer to the Motion Mate DSM314 for
Series 90-30 PLCs User’s Manual, GFK1742 for details. NOTE: The DSM314 will only work
with the CPUs 350, 352, 360, 363, 364, and 374 and only with CPU firmware version 10.00 or
later.
GFK-0467M
Chapter 2 System Operation
2-5
2
Table 2-3. I/O Scan Time Contributions (in milliseconds) for the Series 90-30 CPU311 through CPU341
CPU Model
Module Type
331
311/313
/323
Main
Rack
Expansion
Rack
340/341
Remote
Rack
Main
Rack
Expansion
Rack
Remote
Rack
8-point discrete input
.076
.054
.095
.255
.048
.089
.249
16-point discrete input
.075
.055
.097
.257
.048
.091
.250
32-point discrete input
.094
.094
.126
.335
.073
.115
.321
8-point discrete output
.084
.059
.097
.252
.053
.090
.246
16-point discrete output
.083
.061
.097
.253
.054
.090
.248
32-point discrete output
.109
.075
.129
.333
.079
.114
.320
8-point combination input/output
.165
.141
.218
.529
.098
.176
.489
4-channel analog input
.151
.132
.183
.490
.117
.160
.462
2-channel analog output
.161
.138
.182
.428
.099
.148
.392
High-Speed Counter
2.070
2.190
2.868
5.587
1.580
2.175
4.897
Power Mate APM (1-axis)
2.330
2.460
3.175
6.647
1.750
2.506
5.899
Power Mate APM (2-axis)
3.181
3.647
4.497
9.303
2.154
3.097
7.729
DSM 302*
GCM
40 AI, 6 AQ
3.613
4.081
5.239
11.430
2.552
3.648
9.697
50AI, 9 AQ
4.127
4.611
5.899
13.310
2.911
4.170
11.406
64 AI, 12 AQ
4.715
5.276
6.759
15.747
3.354
4.840
13.615
no devices
.041
.054
.063
.128
.038
.048
.085
11.420
11.570
13.247
21.288
9.536
10.648
19.485
8 64-point devices
GCM+
no devices
.887
.967
1.164
1.920
.666
.901
1.626
32 64-point
devices
4.120
6.250
8.529
21.352
5.043
7.146
20.052
not configured, or
no application task
N/A
3.350
N/A
N/A
1.684
N/A
N/A
read 128 %R as
fast as possible
N/A
4.900
N/A
N/A
2.052
N/A
N/A
ADC 311
N/A
3.340
N/A
N/A
1.678
N/A
N/A
16-channel analog input
(current or voltage)
1.370
1.450
1.937
4.186
1.092
1.570
3.796
I/O Link
Master
no devices
1.910
2.030
1.169
1.925
.678
.904
1.628
sixteen 64-point
devices
6.020
6.170
8.399
21.291
4.992
6.985
20.010
I/O Link Slave
32-point
.206
.222
.289
.689
.146
.226
.636
64-point
.331
.350
.409
1.009
.244
.321
.926
PCM 311
* For applications where the DSM’s contributions to scan time will affect machine
operation you may need to use the Do I/O function block, and the Suspend I/O and Fast
Backplane Status Access service requests to transfer necessary data to and from the
Motion module without getting all the data every scan. Refer to the Motion Mate
DSM302 for Series 90-30 PLCs User’s Manual, GFK1464 for details. NOTE: The
DSM314 is not supported by the 311 through 341 CPUs.
2-6
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
2
Sweep Time Calculation
Table 2-1 lists the seven items that contribute to the sweep time of the PLC. The sweep time
consists of fixed times (housekeeping and diagnostics) and variable times. Variable times vary
according to the I/O configuration, size of the user program, and the type of programming device
connected to the PLC.
Example of Sweep Time Calculation
An example of the calculations for determining the sweep time for a Series 90-30 model 331 PLC
are shown in the table below.
The modules and instructions used for these calculations are listed below:
•
Input modules: five 16-point Series 90-30 input modules.
•
Output modules: four 16-point Series 90-30 output modules.
•
Programming instructions: A 1200-step program consisting of 700 Boolean instructions (LD,
AND, OR, etc.), 300 output coils (OUT, OUTM, etc.), and 200 math functions (ADD, SUB,
etc.).
Time Contribution
Sweep
Component
GFK-0467M
Calculation
Without
Programmer
With
HHP
With
Logicmaster
Housekeeping
0.705ms
0.705ms
0.705ms
0.705ms
Data Input
0.055 x 5 = 0.275ms
0.275ms
0.275ms
0.275ms
Program
Execution
1000 x 0.4µs* + 200 x 89µs** + 18.2ms
18.2ms
18.2ms
18.2ms
Data Output
0.061 x 4 = 0.244ms
0.244ms
0.244ms
0.244ms
Programmer
Service
0.4ms + programmer time + 0.6ms
0ms
4.524ms
2.454ms
NonProgrammer
Service
None in this example
0ms
0ms
0ms
Reconfiguration
0.639ms
0.639ms
0.639ms
0.639ms
Diagnostics
0.048ms
0.048ms
0.048ms
0.048ms
PLC Sweep
Time
Housekeeping + Data Input + Program
Execution + Data Output + Programmer
Service + Non-Programmer Service +
Diagnostics
12.611ms
17.135ms 15.065ms
Chapter 2 System Operation
2-7
2
PLC Sweep Details
This section discusses details of the major portions of the PLC Sweep:
1.
Housekeeping
2.
Input Scan
3.
Application Program Logic Scan
4.
Output Scan
5.
Programmer Service
6.
System Communications
7.
Reconfiguration
8.
Checksum Calculation
1. Housekeeping
The housekeeping portion of the sweep performs all of the tasks necessary to prepare for the start of
the sweep. If the PLC is in CONSTANT SWEEP mode, the sweep is delayed until the required
sweep time elapses. If the required time has already elapsed, the OV_SWP %SA0002 contact is set,
and the sweep continues without delay. Next, timer values (hundredths, tenths, and seconds) are
updated by calculating the difference from the start of the previous sweep and the new sweep time.
In order to maintain accuracy, the actual start of sweep is recorded in 100 microsecond increments.
Each timer has a remainder field which contains the number of 100 microsecond increments that
have occurred since the last time the timer value was incremented.
2. Input Scan
Scanning of inputs occurs during the input scan portion of the sweep, just prior to the logic solution.
During this part of the sweep, all Series 90-30 input modules are scanned and their data stored in
%I (discrete inputs) or %AI (analog inputs) memory, as appropriate. Any global data input received
by a Genius Communications Module (GCM), an Enhanced Genius Communications Module
(GCM+), or a Genius Bus Controller (GBC) is stored in %G memory.
Modules are scanned in ascending reference address order, starting with any installed Genius
Module, then discrete input modules, and finally analog input modules.
If the CPU is in STOP mode and the CPU is configured to not scan I/O in STOP mode, the input
scan is skipped.
3. Application Program Logic Scan or Solution
The application program logic scan occurs immediately following the completion of the input scan.
The application program logic scan performs two main tasks: (1) solving/executing the program
logic and (2) updating %Q, %AI, and %AQ output memory. (Output modules, however, are not
updated until the output scan occurs). In general, ladder logic is solved from left to right and top to
bottom, although this flow direction can be altered temporarily by subroutine calls and jumps. The
2-8
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
2
logic solution ends when an END instruction is encountered or when the default END OF
PROGRAM LOGIC is reached.
The 313 and higher CPUs have an Instruction Sequence Coprocessor (ISCP) that executes the
Boolean instructions, and an 80C188,80386 or AMD SC 520 microprocessor executes the timer,
counter, and function blocks. In the Model 311 and 90-20 CPUs, the 80C188 executes all Boolean,
timer, counter, and function block instructions. On the Micro, the H8 processor executes all
Boolean and function blocks.
A list of execution times for each programming function can be found in Appendix A.
4. Output Scan
Outputs are scanned during the output scan portion of the sweep, immediately following the logic
solution. Outputs are updated using data from %Q (for discrete outputs) and %AQ (for analog
outputs) memory, as appropriate. If you have a Genius Communications Module or Genius Bus
Controller that is configured to transmit global data, then data from %G memory is sent to the
GCM, GCM+, or GBC. The Series 90-20 and Micro output scans include discrete outputs only.
During the output scan, all Series 90-30 output modules are scanned in ascending reference address
order. The output scan is completed when all output data has been sent to all Series 90-30 output
modules.
If the CPU is in the STOP mode and IPScan-Stop parameter on the CPU configuration screen is
set to NO, the output scan is skipped.
Caution
If the IPScan-Stop parameter on the CPU configuration screen is set to YES,
real-world outputs may be turned ON even when the PLC is in STOP mode,
because the PLC will write the current values in the output tables to the
output modules during the Output Scan.
5. Programmer Communications Window
This part of the sweep is dedicated to communicating with the programmer. If there is a
programmer attached, the CPU executes the programmer communications window. The
programmer communications window will not execute if there is no programmer attached and no
module to be configured in the system. Only one module is configured each sweep.
Support is provided for the Hand-Held Programmer and for other programmers that can connect to
the serial port and use the Series Ninety Protocol (SNP) protocol. Support is also provided for
programmer communications with intelligent option modules.
Programmer Communications Window Modes
•
GFK-0467M
Limited Mode. In the default Limited window mode, the CPU performs one operation for
the programmer each sweep, that is, it honors one service request or response to one key
press. If the programmer makes a request that requires more than 6 (or 8 depending on the
CPU—see Note) milliseconds to process, the request processing is spread out over several
Chapter 2 System Operation
2-9
2
sweeps so that no sweep is impacted by more than 6 (or 8 depending on the CPU—see Note)
milliseconds.
Note
The time limit for the communications window is 6 milliseconds for the 340 and
higher CPUs and 8 milliseconds for the 311, 313, 323, and 331 models.
•
Complete Mode. In the Complete mode, the CPU will conduct programmer
communications until they are complete or until 50 milliseconds elapses.
The following figure is a flow chart for the programmer communications portion of the sweep.
a45659
START
PROGRAMMER
ATTACHED
ATTACHED
PREVIOUS
STATUS
?
NO
PROGRAMMER
REQUEST
?
PROGRAMMER
ATTACHED
STATUS
HAND-HELD
PROGRAMMER
ATTACHED
NOT
ATTACHED
NOT
ATTACHED
ABORT
OPERATION
IN PROGRESS
PREVIOUS
STATUS
?
NO
KEY
PRESSED
?
SETUP FOR
HAND-HELD
PROGRAMMER
YES
PROCESS REQUEST
ATTACHED
YES
SETUP FOR
SERIES 90
PROTOCOL
PROCESS KEY
SEND INITIAL
DISPLAY
SEND NEW DISPLAY
STOP
Figure 2-2. Programmer Communications Window Flow Chart
6. System Communications Window (Models 331 and Higher)
This is the part of the sweep where communications requests from intelligent option modules, such
as the PCM or DSM, are processed (see flow chart). Requests are serviced on a first-come-firstserved basis. However, since intelligent option modules are polled in a round-robin fashion, no
intelligent option module has priority over any other intelligent option module.
In the default Run-to-Completion mode, the length of the system communications window is
limited to 50 milliseconds. If an intelligent option module makes a request that requires more than
50 milliseconds to process, the request is spread out over multiple sweeps so that no one sweep is
impacted by more than 50 milliseconds.
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2
START
a43066
ANY
REQUESTS
IN QUEUE
?
NO
YES
DEQUEUE A REQUEST
PROCESS THE REQUEST
NO
WINDOW
TIMER
TIMEOUT
?
YES
POLLING
STOPPED
?
NO
YES
RESTART POLLING
STOP
Figure 2-3. System Communications Window Flow Chart
7. Reconfiguration
During this portion of the sweep, the CPU checks the actual hardware lineup against the configured
hardware lineup. Slots that are configured for a module but that are empty physically, or slots that
contain faulted modules, will not be scanned by the CPU (i.e. the CPU will not read any input data
from, and will not send any output data to that module or slot). During reconfiguration, if the CPU
detects that a slot previously identified as containing a faulted module now has a good module, or
that a configured module has been physically added to the PLC, it will begin scanning that module.
Reconfiguration enables the CPU to do the following:
GFK-0467M
•
Recognize a legitimate change that you make in the configuration.
•
Ignore potentially corrupted or inaccurate input data from faulted or missing modules.
•
Avoid sending output data that could become corrupted by a faulted output module.
Chapter 2 System Operation
2-11
2
8. Checksum Calculation
A checksum calculation is performed on the user program at the end of every sweep. Since it would
take too long to calculate the checksum of the entire program, you can specify the number of words
from 0 to 32 to be checked on the CPU configuration screen.
If the calculated checksum does not match the reference checksum, the program checksum failure
exception flag is raised. This causes a fault entry to be inserted into the PLC fault table and the PLC
mode to be changed to STOP. If the checksum calculation fails, the programmer communications
window is not affected. The default number of words to be checksummed is 8.
PCM Communications with the PLC (Models 331 and Higher)
There is no way for intelligent option modules (IOM), such as the PCM, to interrupt the CPU when
they need service. The CPU must poll (check periodically) each intelligent option module for
service requests. This polling occurs asynchronously in the background during the sweep (see flow
chart below).
When an intelligent option module is polled and sends the CPU a service request, the request is
queued for processing during the system communications window.
Figure 2-4. PCM Communications with the PLC
2-12
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2
Digital Servo Module (DSM) Communications with the PLC
The DSM302 and DSM314 are intelligent option modules that operate asynchronously with the
Series 90-30 CPU module. Data is exchanged between the CPU and a DSM automatically via %Q,
%I, %AQ, and %AI memory. A PLC CPU requires time to read and write the exchange data across
the PLC backplane with the DSM module. Table 2-2 lists the sweep impact for the various possible
DSM configurations. For additional timing considerations that apply to the DSM modules, refer to
the following manuals:
•
Motion Mate DSM302 for Series 90-30 PLCs User’s Manual, GFK-1464.
•
Motion Mate DSM314 for Series 90-30 PLCs User’s Manual, GFK-1742.
Standard Program Sweep Variations
In addition to the normal execution of the standard program sweep, certain variations can be
encountered or forced. These variations, described in the following paragraphs, can be displayed
and/or changed from the programming software.
Constant Sweep Time Mode
In the standard program sweep, each sweep executes as quickly as possible with a varying amount
of time consumed each sweep. An alternative to this is CONSTANT SWEEP TIME mode, where
each sweep consumes the same amount of time. You can achieve this by setting the Configured
Constant Sweep, which will then become the default sweep mode, thereby taking effect each time
the PLC goes from STOP to RUN mode. You may set a CONSTANT SWEEP TIME mode value
between 5 to 200 milliseconds for CPUs 311-341 or between 5 and 500 milliseconds for the 350364 and 374 CPUs.
Due to variations in the time required for various parts of the PLC sweep, the constant sweep time
should be set at least 10 milliseconds higher than the sweep time that is displayed on the status line
when the PLC is in NORMAL SWEEP mode. This prevents the occurrence of extraneous
oversweep faults.
Use the CONSTANT SWEEP TIME mode when I/O points or register values must be polled at a
constant frequency, such as in control algorithms. Another reason might be to ensure that a certain
amount of time elapses between the output scan and the next sweep’s input scan, permitting inputs
to settle after receiving output data from the program.
If the constant sweep timer expires before the sweep completes, the entire sweep, including the
communications windows, is completed. However, an oversweep fault is logged at the beginning of
the next sweep.
GFK-0467M
Chapter 2 System Operation
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2
Configuring Constant Sweep Mode
There are two ways to configure Constant Sweep Mode:
•
In Logicmaster configuration software, the CPU configuration screen has
configurable Sweep Mode and Sweep Timer parameters. After making your
selections, you must store the configuration from the programmer to the PLC during
STOP mode before the changes will take effect. Once stored, this configuration
becomes the default sweep mode.
•
In Logicmaster programming software, the PLC Sweep Table selection on the PLC Control
and Status menu has Sweep Mode and Timing parameter selection options. The parameters
on this screen can only be edited in RUN mode. Changes made from this screen are only
stored to the PLC, not to the folder on your PC, and are only effective while the PLC remains
in Run mode. Once the PLC stops, it assumes the default Sweep Mode, which becomes
effective the next time the PLC goes into Run mode. This method for temporarily
configuring the Sweep Mode is useful for system design and debug operations.
PLC Sweep When in STOP Mode
When the PLC is in STOP mode, the application program is not executed. Communications with
the programmer and intelligent option modules continue. In addition, faulted module polling and
module reconfiguration execution continue while in STOP mode. For efficiency, the operating
system uses larger “time-slice” values than those used in RUN mode (usually about 50 milliseconds
per window). You can choose whether or not the I/O is scanned. I/O scans may execute in STOP
mode if the IOScan-Stop parameter on the CPU detail screen is set to YES.
Caution
If the IPScan-Stop parameter on the CPU detail screen is set to YES, realworld outputs may be turned ON even when the PLC is in STOP mode,
because the PLC will write the current values in the output tables to the
output modules during the Output Scan.
Communication Window Modes
The default window mode for the programmer communication window is “Limited” mode. That
means that if a request takes more than 6 milliseconds to process, it is processed over multiple
sweeps, so that no one sweep is impacted by more than 6 milliseconds. For the 313, 323, and 331
CPUs, the sweep impact may be as much as 12 milliseconds during a RUN-mode store. The active
window mode can be changed using the “Sweep Control” screen in Logicmaster—for instructions
on changing the active window mode, refer to Chapter 5, “PLC Control and Status,” in the
Logicmaster 90™ Series 90™-30/20/Micro Programming Software User’s Manual (GFK-0466).
Note
If the system window mode is changed to Limited, then option modules such as
the PCM or GBC that communicate with the PLC using the system window will
have less impact on sweep time, but response to their requests will be slower.
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Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
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2
Keylock Switch on 35x, 36x and 37x Series CPUs: Change Mode and
Flash Protect
All 350—374 CPUs have a keylock switch (CPUs 311-341 do not); however, some versions of
CPU firmware do not support all keylock switch features. These differences are discussed in this
section. Note that the keylock switches on some of these CPUs are labeled ON/RUN and
OFF/STOP, and on others are labeled ON and OFF. Regardless of the labeling, all of these keylock
switches work as described below.
Flash Memory Protection (Hard-Wired)
This hard-wired, non-configurable feature can be used to prevent Flash memory from being
changed by unauthorized people (people without a key). When the keylock switch is in the ON
position, Flash memory cannot be written to. Flash memory can only be written to when this switch
is OFF. This keylock switch feature is always in effect, regardless of how the next two configurable
features are set.
Run/Stop (Configurable)
This configurable feature was introduced in CPU firmware release 7.00. It is set by the R/S Switch
parameter on the CPU configuration screen. The R/S Switch parameter is set to Disabled by
default. If the R/S Switch parameter is set to Enabled, you can stop the PLC by turning the
keylock switch to OFF, and start the PLC by turning the switch to ON (if there are no faults). If
faults exist, one of the following will happen:
•
If the PLC has a non-fatal fault, turning the keylock switch from OFF to ON will cause the
PLC to go into run mode, and the RUN light will turn on steady, but the fault tables will not
be cleared.
•
If the PLC has a fatal fault, turning the keylock switch from OFF to ON will cause the
RUN light to flash on and off for a period of five seconds, and the PLC will not go into run
mode. This flashing light indicates the presence of one or more fatal faults in the Fault
Tables. You can try to clear the fault table faults by turning the keylock switch from OFF to
ON again during the five-second period. (If the five-second period has expired, turning the
keylock switch from OFF to ON will start another five-second period.) If the faults do not
clear using this method, you will have to remedy the causes of the fatal faults before being
able to resume operation. See Chapter 3 for fault details.
Other Run/Stop Keylock Switch Considerations
GFK-0467M
•
If the R/S Switch parameter is set to Enabled and the keylock switch is in the OFF position,
the PLC will be in STOP mode, and the programming software cannot be used to place the
PLC into RUN mode.
•
If the R/S Switch parameter is set to Enabled, the keylock switch is in the ON position, and
there are no fatal faults, the programming software can be used to toggle the PLC between the
RUN and STOP modes.
Chapter 2 System Operation
2-15
2
•
If the R/S Switch parameter is set to Enabled, the keylock switch is in the ON position, but
the PLC is stopped, you can place the PLC into RUN mode by either turning the keylock
switch to the OFF position and then back to ON, or by using the programming software.
RAM Memory and Override Protection (Configurable)
This feature was introduced in CPU firmware release 8.00. It is set by the Mem Protect parameter
on the CPU configuration screen. The Mem Protect parameter is set to Disabled by default.
If the Mem. Protect parameter is set to Enabled, and the keylock switch is in the ON position, the
following is true:
•
User RAM memory (program and configuration) cannot be changed.
•
Discrete points cannot be overridden.
•
The Time of Day (TOD) clock cannot be changed with the Hand-Held Programmer
(however, the TOD clock can still be changed using the configuration software).
Safeguard your Keys
Each new 350—374 CPU is shipped with two keys for the keylock switch. If you use one or more
of the keylock switch protection features described above, we recommend you carefully safeguard
your keys. If they are lost, misplaced, or stolen, you may be locked out from working on your PLC,
and unauthorized persons may have access to it. You may want to purchase spare keys for backup
purposes, or if more than two persons need access to the PLC. A keylock switch key kit, containing
three sets of keys, can be purchased from a GE Fanuc distributor. When ordering, request catalog
number 44A736756-G01. All 350—374 CPUs use the same key.
Disabling Keylock Switch Features
If you do not need to use any of the protection features of the keylock switch, you can choose to
disable them all. To do so, leave the keylock switch set to the OFF position, and set the R/S Switch
and Mem. Protect parameters (described above) to Disabled (their default setting). In this
condition, all keylock switch protection features will be disabled, and you will not need to use a key
to access the PLC.
2-16
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
2
Section 2: Program Organization and User References/Data
The user memory size for the Series 90-30 programmable controllers is listed in the following table.
User Memory Size
CPU Models
User Memory (Kbytes)
CPU311
6
CPU313, CPU323
12
CPU331
16
CPU340
32
CPU341
80
CPU350
80 (release 9.00 and later)
32 (prior to release 9.00)
CPU351, CPU352,
CPU360, CPU363,
CPU364, CPU374
240 (release 9.00 and later)
80 (prior to release 9.00)
Beginning with firmware release 9.00 CPUs, %R, %AI, and %AQ memory sizes for the 351, 352,
360, 363, 364 and 374 CPUs are configurable. (For details, refer to the Logicmaster 90™ Series
90™-30/20/Micro Programming Software User’s Manual, GFK-0466K or later or the User’s
Manual for your programmer software). A program for the Series 90-20 programmable controller
can be up to 2 KB in size for a Model 211 CPU, and the maximum number of rungs allowed per
logic block (main or subroutine) is 3000. For Series 90-30 PLCs, the maximum block size is 80
kilobytes for C blocks and 16 kilobytes for LD and SFC blocks; however, in an SFC block, some of
the 16 KB is used for the internal data block. As shown in the next figure, user program logic is
executed repeatedly by the PLC while the PLC is in normal Run mode.
a45660A
Read Inputs
Execute
Program Logic
Write Outputs
Refer to the Series 90-30 Programmable Controller Installation and Hardware Manual, GFK0356, or the Series 90-20 Programmable Controller User’s Manual, GFK-0551, for a listing of
program sizes and reference limits for each model CPU.
All programs have a variable table that lists the variable and reference descriptions that have been
assigned in the user program.
The block declaration editor lists subroutine blocks declared in the main program.
GFK-0467M
Chapter 2 System Operation
2-17
2
Subroutine Blocks
A program can “call” subroutine blocks as it executes. A subroutine must be declared through the
block declaration editor before a CALL instruction can be used for that subroutine. A maximum of
64 subroutine block declarations in the program and 64 CALL instructions are allowed for each
logic block in the program. The maximum size of a subroutine block is 16 KB or 3000 rungs, but
the main program and all subroutines must fit within the logic size constraints for that CPU model.
Note
Subroutine blocks are not supported in the Series 90-20 PLC or the Micro PLC.
The use of subroutines is optional. Dividing a program into smaller subroutines can simplify
programming, enhance understanding of the control algorithm, and possibly reduce the overall
amount of logic needed for the program.
Examples of Using Subroutine Blocks
As an example, the logic for a program could be divided into three subroutines, each of which could
be called as needed from the program. In this example, the program block might contain little logic,
serving primarily to sequence the subroutine blocks.
A subroutine block can be used many times as the program executes. Logic which needs to be
repeated several times in a program could be entered in a subroutine block. Calls would then be
made to that subroutine block to access the logic. In this way, total program size is reduced.
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Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
2
In addition to being called from the program, subroutine blocks can also be called by other
subroutine blocks (this is called “nesting”). A subroutine block may even call itself.
a45663
SUBROUTINE
2
SUBROUTINE
4
PROGRAM
SUBROUTINE
3
The PLC will only allow eight nested calls before an “Application Stack Overflow” fault is logged
and the PLC transitions to STOP/Fault mode. The call level nesting counts the main program as
level 1.
How Blocks Are Called
A subroutine block executes when called from program logic in a ladder program or from another
subroutine block.
|
|%I0004
%T0001
|——| |—————————————————————————————————————————————————————————————————————( )—
|
______________
|%I0006
|
|
|——| |—————| CALL ASTRO |—
|
| (SUBROUTINE) |
|
|______________|
|
|%I0003 %I0010
%Q0010
|——| |—————| |—————————————————————————————————————————————————————————————( )—
|
This example shows the subroutine CALL instruction as it will appear on the ladder logic screen.
Execution Sequence in Programs Containing Subroutines
If a subroutine is called from a program or other subroutine, the called subroutine will execute to its
end, then return control back to the program or subroutine that called it. Control will return to the
rung following the rung that contains the subroutine call. In the example below, the heavy dotted
line shows program flow (the order in which logic is executed). In this example, a simple two-rung
subroutine is called from Rung 4 of the Main Program. After the two subroutine rungs are
executed, program flow returns to the Main Program, starting with Rung 5.
GFK-0467M
Chapter 2 System Operation
2-19
2
Main Program
Rung 1
Rung 2
Rung 3
Rung 4, Call Subroutine 1
Rung 5
Rung 6
Rung 7
…
End
Program Flow
Subroutine 1
Rung 1
Rung 2
Return
Periodic Subroutines
Version 4.20 or later of the 340 and higher CPUs support periodic subroutines. Please note the
following restrictions:
1.
Timer (TMR, ONDTR, and OFDTR) function blocks will not execute properly within a
periodic subroutine. A DOIO function block within a periodic subroutine whose reference
range includes references assigned to a Smart I/O Module (HSC, APM, DSM, Genius, etc.)
will cause the CPU to lose communication with the module. The FST_SCN and LST_SCN
contacts (%S1 and %S2) will have an indeterminate value during execution of the periodic
subroutine. A periodic subroutine cannot call or be called by other subroutines.
2.
The latency for the periodic subroutine (that is, the maximum interval between the time the
periodic subroutine should have executed and the time it actually executes) can be around 0.35
milliseconds if there is no PCM, CMM, or ADC module in the main rack. If there is a PCM,
CMM or ADC module in the main rack—even if it is not configured or used—the latency can
be almost 2.25 milliseconds. For that reason, use of the periodic subroutine with PCM-based
products is not recommended.
User References
The data used in an application program is stored as either register or discrete references.
Table 2-4. Register References
2-20
Type
Description
%R
The prefix %R is used to assign system register references, which will store program data such as
the results of calculations.
%AI
The prefix %AI represents an analog input register. This prefix is followed by the register address
of the reference (for example, %AI0015). An analog input register holds the value of one analog
input or other value.
%AQ
The prefix %AQ represents an analog output register. This prefix is followed by the register
address of the reference (for example, %AQ0056). An analog output register holds the value of
one analog output or other value.
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
2
Note
All register references are retained across a power cycle to the CPU.
Table 2-5. Discrete References
Type
Description
%I
The %I prefix represents input references. This prefix is followed by the reference’s address in
the input table (for example, %I00121). %I references are located in the input status table, which
stores the state of all inputs received from input modules during the last input scan. A reference
address is assigned to discrete input modules using the configuration software or the Hand-Held
Programmer. Until a reference address is assigned, no data will be received from the module. %I
data can be retentive or non-retentive.
%Q
The %Q prefix represents physical output references. The coil check function of
Logicmaster 90-30/20/Micro software checks for multiple uses of %Q references with relay coils
or outputs on functions. Beginning with Release 3 of the software, you can select the level of coil
checking desired (SINGLE, WARN MULTIPLE, or MULTIPLE). Refer to the Programming
Software User’s Manual, GFK-0466, for more information about this feature.
The %Q prefix is followed by the reference’s address in the output table (for example,
%Q00016). %Q references are located in the output status table, which stores the state of the
output references as last set by the application program. This output status table’s values are sent
to output modules during the output scan.
A reference address is assigned to discrete output modules using the configuration software or the
Hand-Held Programmer. Until a reference address is assigned, no data is sent to the module. A
particular %Q reference may be either retentive or non-retentive. *
%M
The %M prefix represents internal references. The coil check function checks for multiple uses of
%M references with relay coils or outputs on functions. Beginning with Release 3 of the software,
you can select the level of coil checking desired (SINGLE, WARN MULTIPLE, or MULTIPLE).
Refer to GFK-0466 for more information about this feature. A particular %M reference may be
either retentive or non-retentive. *
%T
The %T prefix represents temporary references. Because these references are never checked for
multiple coil use, they can be used many times in the same program, even when coil use checking
is enabled. %T can be used to prevent coil use conflicts while using the cut/paste and file
write/include functions. Because this memory is intended for temporary use, it is not retained
through power loss or RUN-TO-STOP-TO-RUN transitions and cannot be used with retentive
coils.
%S
The %S prefix represents system status references. These references are used to access special
PLC data, such as timers, scan information, and fault information. System references include
%S, %SA, %SB, and %SC references.
%S, %SA, %SB, and %SC can be used on any contacts.
%SA, %SB, and %SC can be used on retentive coils –(M)–.
%S can be used as word or bit-string input arguments to functions or function blocks.
%SA, %SB, and %SC can be used as word or bit-string input or output arguments to functions
and function blocks.
%G
*
GFK-0467M
The %G prefix represents global data references. These references are used to access
data shared among several PLCs. %G references can be used on contacts and retentive coils
because %G memory is always retentive. %G cannot be used on non-retentive coils.
Retentiveness is based on the type of coil. For more information, refer to “Retentiveness of Data” on the next page.
Chapter 2 System Operation
2-21
2
Nicknames
A user may, optionally, assign a nickname to a reference address. A nickname is useful because it
can convey information to the user about the purpose or function of the address. For example, in a
PLC system installed in a factory, output coil %Q0001 is used to energize a motor starter relay that
controls a physical pump, commonly called “Pump Number 1” by the factory’s employees.
Assigning the nickname PUMP1 to %Q0001 would help an employee who is troubleshooting the
system to recognize the purpose of %Q0001.
Nicknames must begin with a letter and may be from one to seven characters long. To distinguish
between a memory address (reference) and a nickname, a percent sign (%) is used as the first
character of a memory address. So, for example, M1 is considered by the PLC to be a nickname,
but %M1 is considered to be a memory address. For more information about nicknames, please
see manual GFK-0466 (the Logicmaster user’s manual for the Series 90-30 PLC).
Transitions and Overrides
The %I, %Q, %M, and %G user references have associated transition and override bits. %T, %S,
%SA, %SB, and %SC references have transition bits, but not override bits. The CPU uses transition
bits for counters and transitional coils. Note that counters do not use the same kind of transition bits
as coils. Transition bits for counters are stored within the locating reference.
In the Model 331 and higher CPUs, override bits can be set. When override bits are set, the
associated references cannot be changed from the program or the input device; they can only be
changed on command from the programmer. CPU Models 323, 321, 313, and 311, and the Micro
CPUs do not support overriding discrete references.
Retentiveness of Data
Data is said to be retentive if it is saved by the PLC when the PLC is stopped. The Series 90 PLC
preserves program logic, fault tables and diagnostics, overrides and output forces, word data (%R,
%AI, %AQ), bit data (%I, %SC, %G, fault bits and reserved bits), %Q and %M data (unless used
with non-retentive coils), and word data stored in %Q and %M. %T data is not saved. Although, as
stated above, %SC bit data is retentive, the defaults for %S, %SA, and %SB are non-retentive.
%Q and %M references are non-retentive (that is, cleared at power-up when the PLC switches from
STOP to RUN) whenever they are used with non-retentive coils. Non-retentive coils include coils
—( )—, negated coils —(/)—, SET coils —(S)—, and RESET coils —(R)—.
When %Q or %M references are used with retentive coils, or are used as function block outputs, the
contents are retained through power loss and RUN-TO-STOP-TO-RUN transitions. Retentive
coils include retentive coils —(M)—, negated retentive coils —(/M)—, retentive SET coils —
(SM)—, and retentive RESET coils —(RM)—.
The last time a %Q or %M reference is programmed on a coil instruction determines whether the
%Q or %M reference is retentive or non-retentive based on the coil type. For example, if %Q0001
was last programmed as the reference of a retentive coil, the %Q0001 data will be retentive.
However, if %Q0001 was last programmed on a non-retentive coil, the %Q0001 data will be
non-retentive.
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GFK-0467M
2
Data Types
Table 2-6. Data Types
Type
INT
DINT
BIT
Name
Signed
Integer
Double
Precision
Signed
Integer
Description
Signed integers use 16-bit memory
data locations, and are represented
in 2’s complement notation. (Bit 16 is the
sign bit.) The valid range of an INT data
type is –32,768 to +32,767.
Register 1
S|
16
1
Double precision signed integers are
stored in 32-bit data memory
locations (actually two consecutive 16-bit
memory locations) and represented in 2’s
complement notation. (Bit 32 is the sign
bit.) The valid range of a DINT data type
is –2,147,483,648 to +2,147,483,647.
Register 2
S|
32
17
Bit
A Bit data type is the smallest unit of
memory. It has two states, 1 or 0. A BIT
string may have length N.
BYTE
Byte
A Byte data type has an 8-bit value.
The valid range is 0 to 255 (0 to FF in
hexadecimal).
WORD
Word
A Word data type uses 16 consecutive
bits of data memory; but, instead of the
bits in the data location
representing a number, the bits are
independent of each other. Each bit
represents its own binary state (1 or
0), and the bits are not looked at
together to represent an integer
number. The valid range of word
values is 0 to FFFF.
DWORD Double
Word
BCD-4
REAL
Data Format
A Double Word data type has the same
characteristics as a single word data type,
except that it uses 32 consecutive bits in
data memory instead of 16 bits. The valid
range of double word values is 0 to
FFFFFFFF.
Four-Digit
Binary
Coded
Decimal
Four-digit BCD numbers use 16-bit data
memory locations. Each BCD
digit uses four bits and can represent
numbers between 0 and 9. This BCD
coding of the 16 bits has a legal value
range of 0 to 9999.
Floating
Point
Real numbers use 32 consecutive bits
(actually two consecutive 16-bit memory
locations). The range of numbers that can
be stored in this format is from ±
1.401298E-45 to ± 3.402823E+38.
(16 bit positions)
Register 1
16
1
(Two’s Complement Value)
Register 1
(16 bit positions)
16
1
Register 2
32
Register 1
17
16
1
(32 bit states)
Register 1
4 |3 | 2 | 1
16 13
9
5
(4 BCD digits)
1
Register 2
S|
32
17
Register 1
16
1
(Two’s Complement Value)
S = Sign bit (0 = positive, 1 = negative).
GFK-0467M
Chapter 2 System Operation
2-23
2
System Status References
System status references in the Series 90 PLC are assigned to %S, %SA, %SB, and %SC memory.
They each have a nickname. Examples of time tick references include T_10MS, T_100MS, T_SEC,
and T_MIN. Examples of convenience references include FST_SCN, ALW_ON, and ALW_OFF.
Note
%S bits are read-only bits; do not write to these bits. You may, however, write to
%SA, %SB, and %SC bits.
Listed below are system status references that can be used in an application program. When
entering logic, either the reference or the nickname can be used. Refer to chapter 3, “Fault
Explanations and Correction,” for more detailed fault descriptions and information on correcting
the fault. You cannot use these special nicknames to name other memory references.
Table 2-7. System Status References
Reference
Nickname
%S0001
FST_SCN
Set to 1 when the current sweep is the first sweep.
%S0002
LST_SCN
Reset from 1 to 0 when the current sweep is the last sweep.
%S0003
T_10MS
0.01 second timer contact.
%S0004
T_100MS
0.1 second timer contact.
%S0005
T_SEC
1.0 second timer contact.
%S0006
T_MIN
1.0 minute timer contact.
%S0007
ALW_ON
%S0008
ALW_OFF
Always OFF.
%S0009
SY_FULL
Set when the PLC fault table fills up. Cleared when an entry is removed
from the PLC fault table and when the PLC fault table is cleared.
%S0010
IO_FULL
Set when the I/O fault table fills up. Cleared when an entry is removed
from the I/O fault table and when the I/O fault table is cleared.
%S0011
OVR_PRE
Set when an override exists in %I, %Q, %M, or %G memory.
%S0013
PRG_CHK
Set when background program check is active.
%S0014
PLC_BAT
%S0017
%S0018
%S0019
%S0020
SNPXACT
SNPX_RD
SNPX_WT
Set to indicate a bad battery in a Release 4 or later CPU. The contact
reference is updated once per sweep.
SNP-X host is actively attached to the CPU.
SNP-X host has read data from the CPU.
SNP-X host has written data to the CPU.
Set ON when a relational function using REAL data executes successfully.
It is cleared when either input is NaN (Not a Number).
%S0032
2-24
Definition
Always ON.
Reserved for use by the programming software.
%SA0001
PB_SUM
Set when a checksum calculated on the application program does not match
the reference checksum. If the fault was due to a temporary failure, the
discrete bit can be cleared by again storing the program to the CPU. If the
fault was due to a hardware RAM failure, the CPU must be replaced.
%SA0002
OV_SWP
Set when the PLC detects that the previous sweep took longer than the time
specified by the user. Cleared when the PLC detects that the previous
sweep did not take longer than the specified time. It is also cleared during
the transition from STOP to RUN mode. Only valid if the PLC is in
CONSTANT SWEEP mode.
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GFK-0467M
2
Reference
Nickname
Definition
%SA0003
APL_FLT
Set when an application fault occurs. Cleared when the PLC transitions
from STOP to RUN mode.
%SA0009
CFG_MM
Set when a configuration mismatch is detected during system power-up or
during a store of the configuration. Cleared by powering up the PLC when
no mismatches are present or during a store of configuration that matches
hardware.
%SA0010
HRD_CPU
Set when the diagnostics detects a problem with the CPU hardware.
Cleared by replacing the CPU module.
%SA0011
LOW_BAT
Set when a low battery fault occurs. Cleared by replacing the battery and
ensuring that the PLC powers up without the low battery condition.
%SA0014
LOS_IOM
Set when an I/O module stops communicating with the PLC CPU. Cleared
by replacing the module and cycling power on the main rack.
%SA0015
LOS_SIO
Set when an option module stops communicating with the PLC CPU.
Cleared by replacing the module and cycling power on the main rack.
%SA0019
ADD_IOM
Set when an I/O module is added to a rack. Cleared by cycling power on
the main rack and when the configuration matches the hardware after a
store.
%SA0020
ADD_SIO
Set when an option module is added to a rack. Cleared by cycling power on
the main rack and when the configuration matches the hardware after a
store.
%SA0027
HRD_SIO
Set when a hardware failure is detected in an option module. Cleared by
replacing the module and cycling power on the main rack.
%SA0031
SFT_SIO
Set when an unrecoverable software fault is detected in an option module.
Cleared by cycling power on the main rack and when the configuration
matches the hardware.
%SB0010
BAD_RAM
Set when the CPU detects corrupted RAM memory at power-up. cleared
when the CPU detects that RAM memory is valid at power-up.
%SB0011
BAD_PWD
Set when a password access violation occurs. Cleared when the PLC fault
table is cleared.
%SB0013
SFT_CPU
Set when the CPU detects an unrecoverable error in the software. Cleared
by clearing the PLC fault table.
%SB0014
STOR_ER
Set when an error occurs during a programmer store operation. Cleared
when a store operation is completed successfully.
%SC0009
ANY_FLT
Set when any fault occurs. Cleared when both fault tables have no entries.
%SC0010
SY_FLT
Set when any fault occurs that causes an entry to be placed in the PLC fault
table. Cleared when the PLC fault table has no entries.
%SC0011
IO_FLT
Set when any fault occurs that causes an entry to be placed in the I/O fault
table. Cleared when the I/O fault table has no entries.
%SC0012
SY_PRES
Set as long as there is at least one entry in the PLC fault table. Cleared
when the PLC fault table has no entries.
%SC0013
IO_PRES
Set as long as there is at least one entry in the I/O fault table. Cleared when
the I/O fault table has no entries.
%SC0014
HRD_FLT
Set when a hardware fault occurs. Cleared when both fault tables have no
entries.
%SC0015
SFT_FLT
Set when a software fault occurs. Cleared when both fault tables have no
entries.
Note: Any %S reference not listed here is reserved and must not be used in program logic.
GFK-0467M
Chapter 2 System Operation
2-25
2
Function Block Structure
Each rung of logic is composed of one or more programming instructions. These may be simple
relays or more complex functions.
Format of Ladder Logic Relays
The programming software includes several types of relay functions. These functions provide basic
flow and control of logic in the program. Examples include a normally open relay contact and a
negated coil. Each of these relay contacts and coils has one input and one output. Together, they
provide logic flow through the contact or coil.
Each relay contact or coil must be given a reference which is entered when selecting the relay. For a
contact, the reference represents a location in memory that determines the flow of power into the
contact. In the following example, if reference %I0122 is ON, power will flow through this relay
contact.
%I0122
–| |–
For a coil, the reference represents a location in memory that is controlled by the flow of power into
the coil. In this example, if power flows into the left side of the coil, reference %Q0004 is turned ON.
%Q0004
–( )–
The programming software and the Hand-Held Programmer both have a coil check function that
checks for multiple uses of %Q or %M references with relay coils or outputs on functions.
Format of Program Function Blocks (Instructions)
Some functions are very simple, like the Master Control Relay (MCR) function, which is shown
with the abbreviated name of the function within brackets:
–[ MCR ]–
Other functions are more complex. They may have several places where you will enter information
(parameter data) to be used by the function.
The example function block illustrated below is a multiplication (MUL) instruction. Its parts are
typical of many function blocks. However, the number and types of parameters used can vary
widely among the various type of function blocks. The upper part of the function block shows the
name of the function. It may also show a data type, in this case, signed integer.
2-26
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Many program functions (instructions) allow you to select the data type for the function after
selecting the function. For example, the data type for the MUL function could be changed to double
precision signed integer (D_INT). Additional information on data types is provided earlier in this
chapter.
Instruction Type
Data Type
MUL
INT
GFK-0467M
Chapter 2 System Operation
???????
I1
???????
I2
Q
???????
2-27
2
Function Block (Instruction) Parameters
Each line entering the left side of a function block represents an input for that function. There are
two forms of input used with function blocks, discrete and analog. Discrete inputs are either ON or
OFF. In the figure below, the enabling contact %I0001 is an example of a discrete input. Analog
inputs can be either constants or references. A constant is an explicit value. A reference is the
memory address of a value. Generally, a reference is used if the input data is subject to change.
For example, a reference might be the address of an input from an analog measuring device.
In the following example, input parameter I1 for an ADD function block is a constant, and input
parameter I2 is a reference.
%Q0001
%I0001
ADD
Int
CONST
+00010
I1
%AI0001
I2
Q
%R0002
Each line exiting the right side of the function block represents an output. Outputs can be either
discrete or analog. If analog, the value is placed into a register (reference). In the example above,
the function block’s OK output is discrete and it controls coil %Q0001. Its Q output, however,
holds the resulting value from the math operation , so it is placed into a register, %R0002 in this
example.
Where the question marks appear on the left of a function block, you will enter either the data itself,
a reference location where the data is found, or a variable representing the reference location where
the data is found. Where question marks appear on the right of a function block, you will usually
enter a reference location for data to be output by the function block or a variable that represents the
reference location for data to be output by the function block.
MUL
INT
???????
I1
???????
I2
Q
???????
Most function blocks do not change input data; instead, they utilize input data in an operation and
place the result of the operation in an output reference.
2-28
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2
For functions that operate on groups of memory addresses (references), a length can be selected for
the function. In the following function block, the LEN operand specifies the number of input words
to be moved (3 in this example).
(Enable)
???????
MOVE_
WORD
(OK)
I1
???????
Q
LEN
00003
Timer, counter, BITSEQ, and ID functions require an address for the location of three words
(registers) that store the current value, preset value, and a control word or “Instance” of the
function. The first word of the three consecutive words appears on-screen below the function
block, shown in the following figure as “(Address).”
(Enable)
ONDTR
1.00s
(Reset)
R
???????
PV
Q
(Address)
Power Flow In and Out of a Function
Power flows into a function block’s Enable input on the upper left through enabling logic. Most
function blocks have a power flow output, called the “OK” output. If the function block executes
properly, the OK output goes high and passes power flow out. If another device is connected to the
OK output, such as the output coil shown below, that device is enabled. However, use of the OK
output is optional for many function blocks, since their primary purpose is to obtain the result of the
operation (multiplication in the example below) at the Q output.
GFK-0467M
Chapter 2 System Operation
2-29
2
Power Flow out
of Instruction
Enabling
Logic
%Q0001
(Enable)
MUL
INT
%R0123
I1
CONST
0002
I2
(OK)
Q
%R0124
Note
If using Logicmaster programming software, function blocks cannot be tied
directly to the left power rail. You can use %S7, the ALW_ON (always on) bit
with a normally open contact tied to the power rail to call a function every sweep.
Power flows out of the function block on the upper right. It may be passed to other program logic or
to a coil (optional). Function blocks pass power when they execute successfully.
2-30
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
2
Section 3: Power-Up and Power-Down Sequences
There are two possible power-up sequences in the Series 90-30 PLC; a cold power-up and a warm
power-up. The CPU normally uses the cold power-up sequence. However, in a Model 331 or higher
PLC system, if the time that elapses between a power-down and the next power-up is less than five
seconds, the warm power-up sequence is used.
Power-Up
A cold power-up consists of the following sequence of events. A warm power-up sequence skips
Step 1.
1.
The CPU will run self-diagnostics. This includes checking a portion of battery-backed RAM to
determine whether or not the RAM contains valid data.
2.
If an EPROM, EEPROM, or flash is present and the PROM power-up option in the PROM
specifies that the PROM contents should be used, the contents of PROM are copied into RAM
memory. If an EPROM, EEPROM, or flash is not present, RAM memory remains the same and
is not overwritten with the contents of PROM.
3.
The CPU interrogates each slot in the system to determine which boards are present.
4.
The hardware configuration is compared with software configuration to ensure that they are the
same. Any mismatches detected are considered faults and are alarmed. For example, if a
module is specified in the software configuration but a different module is present in the actual
hardware configuration, this condition is a fault and is alarmed.
5.
If there is no software configuration, the CPU will use its built-in default configuration.
6.
The CPU establishes the communications channel between itself and any intelligent modules.
7.
In the final step of the execution, the mode of the first sweep is determined based on CPU
configuration. Figure 2-5 on the next page shows the decision sequence for the CPU when it
decides whether to copy from PROM or to power-up in STOP or RUN mode.
Note
Steps 2 through 7 above do not apply to the Series 90 Micro PLC. For
information about the power-up and power-down sequences for the Micro, refer
to the “Power-up and Power-down Sequences” section of Chapter 5, “System
Operation,” in the Series 90 Micro PLC User’s Manual (GFK-1065).
GFK-0467M
Chapter 2 System Operation
2-31
2
','$%&$$&'(%))
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+
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.
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#
!"!
0"
"
0""
--
.
"
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--
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'&"
-.
"
"
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$%&$$&'(%))
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+
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Figure 2-5. Power-Up Sequence
Prior to the START statement on the Power Up Flowchart, the CPU goes through power up
diagnostics which test various peripheral devices used by the CPU and tests RAM. After
completing diagnostics, internal data structures and peripheral devices used by the CPU get
initialized. The CPU then determines if User Ram has been corrupted. If User Ram is corrupted,
the user program and configuration are cleared out and defaulted and all user registers are cleared.
2-32
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GFK-0467M
2
FLOW CHART TERMS:
PRG = User program (PRG SRC = Program Source)
CFG = User configuration
REGS = User registers (%I, %Q, %M, %G, %R, %AI, and %AQ references).
USD = User storage device, either an EPROM, EEPROM, or Flash device.
URAM = Non-volatile user ram which contains PRG, CFG, and REGS.
HHP = Hand-Help Programmer
PU = Power-up
CLR = Clear
BATT = Battery
FLOW CHART EXPANDED TEXT:
(1)
Are the <CLR> and <M_T> keys being pressed on the HHP (Hand-Held Programmer)
during power-up to clear all URAM?
(2)
Is the USD (user storage device) present and is the information in the USD valid?
(3)
Is the PRG SRC parameter in the USD set to Prom meaning to load the PRG (program logic)
and CFG (configuration) from the USD device?
(4)
Is the PRG SRC parameter in the URAM set to Prom meaning to load the PRG and CFG
from the USD device?
(5)
Is the REG SRC parameter in the USD set to Prom meaning to load the REGS (registers)
from the USD device?
(6 & 7) Are the <LD> and <NOT> keys being pressed on the HHP during power-up to keep the
PRG, CFG, and REGS from being loaded from USD?
(8)
Copy PRG, CFG, and REGS from the USD to URAM.
(9)
Copy PRG and CFG from the USD to URAM.
(10)
Is the PRG or CFG checksums just loaded from USD invalid?
(11)
Is the URAM corrupted? Could be due to being powered down without a battery attached or
a low battery. Could also be due to updating firmware.
(12)
Is the PRG SRC parameter in the URAM set to Prom meaning to load the PRG and CFG
from the USD device?
(13)
Is the USD present? This check only applies to CPUs 311-341. The USD is assumed to be
present for CPUs 350-364 and 374.
(14)
Are the <NOT> and <RUN> keys being pressed on the HHP during power-up to
unconditionally power-up in Stop Mode?
(15)
Is the PWR UP parameter in URAM set to RUN?
(16)
Is the battery low?
(17)
Is the PWR UP parameter in URAM set to STOP?
(18)
Set the power up mode to what ever the power down mode was.
(19)
Clear PRG, CFG, and REGS.
Note
The first part of this chart on the previous page does not apply to the Series 90
Micro PLC. For information about the power-up and power-down sequences for
the Micro, refer to the “Power-up and Power-down Sequences” section of
Chapter 5, “System Operation,” in the Series 90 Micro PLC User’s Manual
(GFK-1065).
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Chapter 2 System Operation
2-33
2
Power-Down
System power-down occurs when the power supply detects that incoming AC power has dropped
for more than one power cycle or the output of the 5-volt power supply has fallen to less than 4.9
volts DC.
2-34
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2
Section 4: Clocks and Timers
Clocks and timers provided by the Series 90-30 PLC include an elapsed time clock, a time-of-day
clock (Models 331, 340/341, 350-374, and the 28-point Micro), a watchdog timer, and a constant
sweep timer. Three types of timer function blocks include an on-delay timer, an off-delay timer,
and a retentive on-delay timer (also called a watch clock timer). Four system time-tick contacts
cycle on and off for 0.01 second, 0.1 second, 1.0 second, and 1 minute intervals.
Elapsed Time Clock
The elapsed time clock uses 100 microsecond “ticks” to track the time elapsed since the CPU
powered on. The clock is not retentive across a power failure; it restarts on each power-up. Once
per second the hardware interrupts the CPU to enable a seconds count to be recorded. This seconds
count rolls over approximately 100 years after the clock begins timing.
Because the elapsed time clock provides the base for system software operations and timer function
blocks, it can not be reset from the user program or the programmer. However, the application
program can read the current value of the elapsed time clock by using Service Request 16.
Time-of-Day Clock
The time of day in the 28-point Micro and Series 90-30 PLC Model 331 and higher is maintained
by a hardware time-of-day clock. The time-of-day clock maintains seven time functions:
•
Year (two digits)
•
Month
•
Day of month
•
Hour
•
Minute
•
Second
•
Day of week
The time-of-day (TOD) clock is battery-backed and maintains its present state across a power
failure. However, unless you initialize the clock, the values it contains are meaningless. The
application program can read and set the time-of-day clock using Service Request #7.
The time-of-day clock can also be read and set from the CPU configuration software and with the
Hand-Held Programmer (HHP). However, starting with CPU (350-364) firmware release 8.00, if
the CPU Mem. Protect parameter is set to Enabled, the HHP cannot change the TOD clock if the
CPU keylock switch is in the ON position. Note that keylock protection features only apply to
CPUs 350—374 (other CPUs do not have a keylock switch).
The time-of-day clock is designed to handle month-to-month and year-to-year transitions. It
automatically compensates for leap years until the year 2079.
GFK-0467M
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2-35
2
Watchdog Timer
A watchdog timer in the Series 90-30 PLC is designed to catch catastrophic failure conditions that
result in an unusually long sweep. The timer value for the watchdog timer is 200 milliseconds for
CPUs 311-341, and 500 milliseconds for CPUs 350—374; this is a fixed value that cannot be
changed. The watchdog timer always starts from zero at the beginning of each sweep.
For 331 and lower model 90-30 CPUs, if the watchdog timeout value is exceeded, the OK LED
goes off; the CPU is placed in reset and completely shuts down; and outputs go to their default
state. No communication of any form is possible, and all microprocessors on all boards are halted.
To recover, power must be cycled on the rack containing the CPU. In the 90-20, Series 90 Micro
and 340 and higher 90-30 CPUs, a watchdog timeout causes the CPU to reset, execute its powerup
logic, generate a watchdog failure fault, and change its mode to STOP.
Elapsed Power Down Timer
The elapsed power down timer is used to determining how long the PLC was powered off. When
the PLC is powered off, it resets to 0 and starts to time. When the PLC is powered on, timing stops
and the value is retained. Service Request #29, described in chapter 12, can be used to read the
value of this timer.
Note
This function is available only in the 331 or higher Series 90-30 CPUs.
Constant Sweep Timer
The constant sweep timer controls the length of a program sweep when the Series 90-30 PLC
operates in CONSTANT SWEEP TIME mode. In this mode of operation, each sweep consumes the
same amount of time. The value of the constant sweep timer is set by the programmer and can be
any value from 5 to the value of the watchdog timer. Constant Sweep Time default is 100
milliseconds. Typically, for most application programs, the input scan, application program logic
scan, and output scan do not require exactly the same amount of execution time in each sweep.
If the constant sweep timer expires before the completion of the sweep and the previous sweep was
not an oversweep, the PLC places an oversweep alarm in the PLC fault table. At the beginning of
the next sweep, the PLC sets the OV_SWP fault contact. The OV_SWP contact is reset when the
PLC is not in CONSTANT SWEEP TIME mode or the time of the last sweep did not exceed the
constant sweep timer.
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Time-Tick Contacts
The Series 90 PLC provides four time-tick contacts with time durations of 0.01 second, 0.1 second,
1.0 second, and 1 minute. The state of these contacts only changes during the housekeeping portion
of the PLC sweep. These contacts provide a pulse having an equal on and off time duration. The
contacts are referenced as T_10MS (0.01 second), T_100MS (0.1 second), T_SEC (1.0 second),
and T_MIN (1 minute).
The following timing diagram represents the on/off time duration of these contacts.
1
1
Figure 2-6. Time-Tick Contact Timing Diagram
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2
Section 5: System Security
Security in Series 90-30, Series 90-20, and in the Micro PLCs is designed to prevent unauthorized
changes to the contents of a PLC. There are four security levels available in the PLC. The first
level, which is always available, provides only the ability to read PLC data; no changes are
permitted to the application. The other three levels have access to each level protected by a
password.
Each higher privilege level permits greater change capabilities than the lower level(s). Privilege
levels accumulate in that the privileges granted at one level are a combination of that level, plus all
lower levels. The levels and their privileges are:
Privilege
Level
Level 1
Description
Any data, except passwords may be read. This includes all data memories (%I, %Q, %AQ,
%R, etc.), fault tables, and all program block types (data, value, and constant).
No values may be changed in the PLC.
Level 2
This level allows write access to the data memories (%I, %R, etc.).
Level 3
This level allows write access to the application program in STOP mode only.
Level 4
This is the default level for systems that have no passwords set. The default level for a
system with passwords is to the highest unprotected level. This level, the
highest, allows read and write access to all memories as well as passwords in both RUN and
STOP mode. (Configuration data cannot be changed in RUN mode.)
Passwords
There is one password for each privilege level in the PLC. (No password can be set for level 1
access.) Each password may be unique; however, the same password can be used for more than one
level. Passwords are one to four ASCII characters in length; they can only be entered or changed
with the programming software or the Hand-Held Programmer.
A privilege level change is in effect only as long as communications between the PLC and the
programmer are intact. There does not need to be any activity, but the communications link must
not be broken. If there is no communication for 15 minutes, the privilege level returns to the highest
unprotected level.
Upon connection to the PLC, the programming software requests the protection status of each
privilege level from the PLC. The programming software then requests the PLC to move to the
highest unprotected level, thereby giving the programming software access to the highest
unprotected level without having to request any particular level. When the Hand-Held Programmer
is connected to the PLC, the PLC reverts to the highest unprotected level.
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Privilege Level Change Requests
A programmer requests a privilege level change by supplying the new privilege level and the
password for that level. A privilege level change is denied if the password sent by the programmer
does not agree with the password stored in the PLC’s password access table for the requested level.
The current privilege level is maintained and no change will occur. If you attempt to access or
modify information in the PLC using the Hand-Held Programmer without the proper privilege level,
the Hand-Held Programmer will respond with an error message that the access is denied.
Locking/Unlocking Subroutines
Subroutine blocks can be locked and unlocked using the block-locking feature of programming
software. Two types of locks are available:
Type of Lock
Description
View
Once locked, you cannot zoom into that subroutine.
Edit
Once locked, the information in the subroutine cannot be edited.
A previously view locked or edit locked subroutine may be unlocked in the block declaration editor
unless it is permanently view locked or permanently edit locked.
A search or search and replace function may be performed on a view locked subroutine. If the target
of the search is found in a view locked subroutine, one of the following messages is displayed
instead of logic:
Found in locked block <block_name>
(Continue/Quit)
or
Cannot write to locked block <block_name>
(Continue/Quit)
You may continue or abort the search.
Folders that contain locked subroutines may be cleared or deleted. If a folder contains locked
subroutines, these blocks remain locked when the programming software Copy, Backup, and
Restore folder functions are used.
Permanently Locking a Subroutine
In addition to VIEW LOCK and EDIT LOCK, there are two types of permanent locks. If a
PERMANENT VIEW LOCK is set, all zooms into a subroutine are denied. If a PERMANENT
EDIT LOCK is set, all attempts to edit the block are denied.
Caution
The permanent locks differ from the regular VIEW LOCK and EDIT
LOCK in that once set, they cannot be removed.
Once a PERMANENT EDIT LOCK is set, it can only be changed to a PERMANENT VIEW
LOCK. A PERMANENT VIEW LOCK cannot be changed to any other type of lock.
GFK-0467M
Chapter 2 System Operation
2-39
2
Section 6: Series 90-30, 90-20, and Micro I/O System
The PLC I/O system provides the interface between the Series 90-30 PLC and user-supplied
devices and equipment. Series 90-30 I/O modules plug directly into slots in Series 90-30
baseplates. The number of Series I/O modules supported depends upon the CPU model:
•
CPU models 350—374 support up to 79 I/O modules. These CPUs support up to eight racks,
which includes the CPU rack plus a total of seven expansion and/or remote racks.
• CPU models 331, 340, and 341, support up to 49 I/O modules. These CPUs support up to five
racks, which includes the CPU rack plus a total of four expansion and/or remote racks.
• CPU models 311 and 313 (5-slot baseplates) support up to 5 Series 90-30 I/O modules. CPU
model 323 (10-slot baseplate) supports up to 10 Series 90-30 I/O modules. These three CPUs
do not support expansion or remote racks.
The I/O structure for the Series 90-30 PLC is shown in the following figure.
PLC I/O System
APPLICATION
RAM
% AI
% AQ
%R
CACHE
MEMORY
a43072
%I
%T
%G
%S
%Q
I/O
SCANNER
I/O CONFIGURATION
DATA
%M
16 BITS
1 BIT
SERIES 90-30
BACKPLANE
MODEL 30
DISCRETE
INPUT
MODULE
MODEL 30
DISCRETE
OUTPUT
MODULE
MODEL 30
ANALOG
I/O
MODULE
SERIES
90-30
GENIUS
MODULES
(GCM and GBC)
GENIUS
BUS
SERIES
FIVE
GBC
SERIES
SIX
GBC
SERIES
90-70
GBC
GLOBAL
GENIUS
SERIES
FIVE
CPU
SERIES
SIX
CPU
SERIES
90-70
CPU
SERIES
90-30
CPU
Figure 2-7. Series 90-30 I/O Structure
Note
The drawing shown above is specific to the 90-30 I/O structure. Intelligent and
option modules are not part of the I/O scan; they use the System Communication
Window. For information about the 90-20 I/O structure, refer to the Series 90™20 Programmable Controller User’s Manual (GFK-0551). For information about
the Micro PLC I/O structure, refer to the Series 90™ Micro PLC User’s Manual
(GFK-1065).
2-40
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
2
Series 90-30 I/O Modules
Series 90-30 I/O modules are available as five types, discrete input, discrete output, analog input,
analog output, and option modules. The following table lists the Series 90-30 I/O modules by
catalog number, number of I/O points, and a brief description of each module.
Note
Contact your local GE Fanuc distributor for availability of the modules listed.
Refer to the “Pub Number” column for publications that contain the
specifications and wiring information of each Series 90-30 I/O module.
Figure 2-8. Series 90-30 I/O Modules
Catalog
Number
IC693MDL230
IC693MDL231
IC693MDL240
IC693MDL241
IC693MDL630
IC693MDL632
IC693MDL633
IC693MDL634
IC693MDL640
IC693MDL641
IC693MDL643
IC693MDL644
IC693MDL645
IC693MDL646
IC693MDL652
IC693MDL653
IC693MDL654
IC693MDL655
IC693ACC300
GFK-0467M
Points
8
8
16
16
8
8
8
8
16
16
16
16
16
16
32
32
32
32
8/16
Chapter 2 System Operation
Description
Discrete Modules - Input
120 VAC Isolated
240 VAC Isolated
120 VAC
24 VAC/DC Positive/Negative Logic
24 VDC Positive Logic
125 VDC Positive/Negative Logic
24 VDC Negative Logic
24 VDC Positive/Negative Logic
24 VDC Positive Logic
24 VDC Negative Logic
24 VDC Positive Logic, FAST
24 VDC Negative Logic, FAST
24 VDC Positive/Negative Logic
24 VDC Positive/Negative Logic, FAST
24 VDC Position/Negative Logic
24 VDC Positive/Negative Logic, FAST
5/12 VDC (TTL) Positive/Negative Logic
24 VDC Positive/Negative Logic
Input Simulator
Pub
Number
GFK-0898
GFK-0898
GFK-0898
GFK-0898
GFK-0898
GFK-0898
GFK-0898
GFK-0898
GFK-0898
GFK-0898
GFK-0898
GFK-0898
GFK-0898
GFK-0898
GFK-0898
GFK-0898
GFK-0898
GFK-0898
GFK-0898
2-41
2
Table 2-8. Series 90-30 I/O Modules - Continued
Catalog
Number
2-42
Points
Description
Pub
Number
IC693MDL310
IC693MDL330
IC693MDL340
IC693MDL390
IC693MDL730
IC693MDL731
IC693MDL732
IC693MDL733
IC693MDL734
IC693MDL740
IC693MDL741
IC693MDL742
IC693MDL750
IC693MDL751
IC693MDL752
IC693MDL753
IC693MDL760
IC693MDL930
IC693MDL931
IC693MDL940
12
8
16
5
8
8
8
8
6
16
16
16
Discrete Modules - Output
120 VAC, 0.5A
120/240 VAC, 2A
120 VAC, 0.5A
120/240 VAC Isolated, 2A
12/24 VDC Positive Logic, 2A
12/24 VDC Negative Logic, 2A
12/24 VDC Positive Logic, 0.5A
12/24 VDC Negative Logic, 0.5A
125 VDC Positive/Negative Logic, 2A
12/24 VDC Positive Logic, 0.5A
12/24 VDC Negative Logic, 0.5A
12/24 VDC Positive Logic, 1A
GFK-0898
GFK-0898
GFK-0898
GFK-0898
GFK-0898
GFK-0898
GFK-0898
GFK-0898
GFK-0898
GFK-0898
GFK-0898
GFK-0898
32
32
32
32
16
8
8
16
12/24 VDC Negative Logic
12/24 VDC Positive Logic, 0.3A
5/24 VDC (TTL) Negative Logic, 0.5A
12/24 VDC Positive/Negative Logic, 0.5A
11 Pneumatic and five 24VDC Positive Logic, 0.5 A
Relay, N.O., 4A Isolated
Relay, BC, Isolated
Relay, N.O., 2A
GFK-0898
GFK-0898
GFK-0898
GFK-0898
GFK-1881
GFK-0898
GFK-0898
GFK-0898
IC693MDR390
IC693MAR590
8/8
8/8
Input/Output Modules
24 VDC Input, Relay Output
120 VAC Input, Relay Output
GFK-0898
GFK-0898
IC693ALG220
IC693ALG221
IC693ALG222
IC693ALG223
IC693ALG390
IC693ALG391
IC693ALG392
IC693ALG442
4 ch
4 ch
16
16
2 ch
2 ch
8 ch
4/2
Analog Modules
Analog Input, Voltage
Analog Input, Current
Analog Input, Voltage
Analog Input, Current
Analog Output, Voltage
Analog Output, Current
Analog Output, Current/Voltage
Analog, Current/Voltage Combination Input/Output
GFK-0898
GFK-0898
GFK-0898
GFK-0898
GFK-0898
GFK-0898
GFK-0898
GFK-0898
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
2
Table 2-8. Series 90-30 I/O Modules - Continued
Catalog Number
Description
Pub
Number
Option Modules
IC693APU300
High Speed Counter
GFK-0293
IC693APU301
IC693APU301
Motion Mate APM Module, 1-Axis–Follower Mode
Motion Mate APM Module, 1-Axis–Standard Mode
GFK-0781
GFK-0840
IC693APU302
IC693APU302
IC693MCS001/002*
Motion Mate APM Module, 2-Axis–Follower Mode
Motion Mate APM Module, 2-Axis–Standard Mode
Power Mate J Motion Control System (1 and 2 Axis)
GFK-0781
GFK-0840
GFK-1256
IC693DSM302
IC693DSM314
Motion Mate Digital Servo Module
Motion Mate Digital Servo Module
GFK-1464
GFK-1742
IC693APU305
IC693CMM321
I/O Processor Module
Ethernet Communications Module
GFK-1028
GFK-1541
IC693ADC311
Alphanumeric Display Coprocessor
GFK-0521
IC693BEM331
Genius Bus Controller
GFK-1034
IC693BEM320
I/O Link Interface Module (slave)
GFK-0631
IC693BEM321
I/O Link Interface Module (master)
GFK-0823
IC693CMM311
Communications Coprocessor Module
GFK-0582
IC693CMM301
Genius Communications Module
GFK-0412
IC693CMM302
Enhanced Genius Communications Module
GFK-0695
IC693PBM200
Profibus Master Module
GFK-2121
IC693PBS201
Profibus Slave Module
GFK-2193
IC693PCM300
PCM, 160K Bytes (35Kbytes User MegaBasic Program)
GFK-0255
IC693PCM301
PCM, 192K Bytes (47Kbytes User MegaBasic Program)
GFK-0255
IC693PCM311
PCM, 640K Bytes (190Kbytes User MegaBasic Program)
GFK-0255
IC693PTM100/101
Power Transducer Module (PTM)
GFK-1734
IC693TCM302/303
Temperature Control Module (TCM), eight-channel
GFK-1466
*
Obsolete. Listed for reference only.
I/O Data Formats
Discrete inputs and discrete outputs are stored as bits in bit cache (status table) memory. Analog
input and analog output data are stored as words and are memory resident in a portion of
application RAM memory allocated for that purpose.
Default Conditions for Series 90-30 Output Modules
At power-up, Series 90-30 discrete output modules default to outputs off. They will retain this
default condition until the first output scan from the PLC. Analog output modules can be configured
with a jumper located on the module’s removable terminal block to either default to zero or retain
their last state. Also, analog output modules may be powered from an external power source so that,
even if the PLC has no power, the analog output modules will continue to operate in their selected
default state.
GFK-0467M
Chapter 2 System Operation
2-43
2
Diagnostic Data
Diagnostic bits are available in %S memory that will indicate the loss of an I/O module or a
mismatch in I/O configuration. Diagnostic information is not available for individual I/O points.
More information on fault handling can be in Chapter 3, “Fault Explanations and Correction.”
Global Data
Genius Global Data
The Series 90-30 PLC supports very fast sharing of data between multiple CPUs using Genius
global data. The Genius Bus Controller, IC693BEM331 in CPU, version 5 and later, and the
Enhanced Genius Communications Module, IC693CMM302, can broadcast up to 128 bytes of data
to other PLCs or computers. They can receive up to 128 bytes from each of the up to 30 other
Genius controllers on the network. Data can be broadcast from or received into any memory type,
not just %G global bits.
The original Genius Communications Module, IC693CMM301, is limited to fixed %G addresses
and can only exchange 32 bits per serial bus address from SBA 16 to 23. For new installations, we
recommend this module not be used; instead, use the newer enhanced GCM, which has
considerably more capability.
Global data can be shared between Series Five, Series Six, and Series 90 PLCs connected to the
same Genius I/O bus.
Ethernet Communications
The Model 364 CPU (release 9.0 and later) supports connection to an Ethernet network through
either (but not both) of two built-in Ethernet ports. AAUI and 10BaseT ports are provided. The
Model 374 CPU supports connection to an Ethernet network through two built-in
10BaseT/100BaseTx auto-negotiating full-duplex Ethernet ports.
Both the CPU364 and CPU374 support Ethernet Global Data (EGD), which is similar to Genius
Global Data in that it allows one device (the producer) to transfer data to one or more other devices
(the consumers) on the network. EGD is not supported by Logicmaster 90 software (requires a
Windows-based programmer for Series 90 PLCs.)
2-44
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
2
Series 90-20 I/O Modules
The following I/O modules are available for the Series 90-20 PLC. Each module is listed by catalog
number, number of I/O points, and a brief description. The I/O is integrated into a baseplate along
with the power supply. For the specifications and wiring information of each module, refer to
chapter 5 in the Series 90-20 Programmable Controller User’s Manual, GFK-0551.
Catalog Number
Description
I/O Points
IC692MAA541
I/O and Power Supply Base Module,
120 VAC In/120 VAC Out/120 VAC Power Supply
16 In/12 Out
IC692MDR541
I/O and Power Supply Base Module
24 VDC In/Relay Out/120 VAC Power Supply
16 In/12 Out
IC692MDR741
I/O and Power Supply Base Module
24V DC In/Relay Out/240 VAC Power Supply
16 In/12 Out
IC692CPU211
CPU Module, Model CPU 211
Not Applicable
Configuration and Programming
Configuration is the process of assigning logical addresses, as well as other characteristics, to the
hardware modules in the system. It can be done either before or after programming, using the
configuration software or Hand-Held Programmer; however, it is recommended that configuration
be done first. Refer to the User’s Manual for your programming software for details on how to
create, transfer, edit, and print programs. Chapters 4 through 12 describe the programming
instructions that can be used to create ladder logic programs for the Series 90-30 and Series 90-20
programmable controllers.
.
GFK-0467M
Chapter 2 System Operation
2-45
Chapter
Fault Explanation and Correction
3
This chapter is an aid to troubleshooting the Series 90-30, 90-20, and Micro PLC systems. It
explains the fault descriptions, which appear in the PLC fault table, and the fault categories, which
appear in the I/O fault table.
Each fault explanation in this chapter lists the fault description for the PLC fault table or the fault
category for the I/O fault table. Find the fault description or fault category corresponding to the
entry on the applicable fault table displayed on your programmer screen. Beneath it is a description
of the cause of the fault along with instructions to correct the fault.
Chapter 3 contains the following sections:
GFK-0467M
Section
Title
1
Fault Handling
2
3
Description
Page
Describes the type of faults that may occur in the
Series 90-30 and how they are displayed in the fault
tables. Descriptions of the PLC and I/O fault table
displays are also included.
3-2
PLC Fault Table
Explanations
Provides a fault description of each PLC fault and
instructions to correct the fault.
3-7
I/O Fault Table
Explanations
Describes the Loss of I/O Module and Addition of I/O
Module fault categories.
3-16
3-1
3
Section 1: Fault Handling
Note
This information on fault handling applies to systems programmed using
Logicmaster 90-30/20/Micro software.
Faults occur in the Series 90-30, 90-20, or Series 90 Micro PLC system when certain failures or
conditions happen that affect the operation and performance of the system. These conditions, such
as the loss of an I/O module or rack, may affect the ability of the PLC to control a machine or
process. Or, a reported condition may only act as an alert, such as a low battery signal, which
indicates that the memory backup battery needs to be changed. However, some conditions reported
in the fault tables are not reports of failures. For example, if you were to add a new module to the
PLC, this would be listed in the I/O fault table as “Addition of I/O Module.”
Alarm Processor
A fault is the condition or failure itself. When a fault is received and processed by the CPU, it is
called an alarm. The firmware in the CPU that handles these conditions is called the Alarm
Processor. The user interface for the Alarm Processor is through the programming software. Any
detected fault is recorded in a fault table and displayed on either the PLC fault table screen or the
I/O fault table screen, as applicable.
Classes of Faults
The Series 90-30, 90-20, and Micro PLCs detect several classes of faults. These include internal
failures, external failures, and operational failures.
Fault Class
Internal Failures
Examples
Non-responding modules.
Low battery condition.
Memory checksum errors.
External I/O Failures
Loss of rack or module.
Addition of rack or module.
Operational Failures
Communication failures.
Configuration failures.
Password access failures.
Note
For information specific to Micro PLC fault handling, refer to the Series 90
Micro PLC User’s Manual (GFK-1065).
3-2
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
3
System Reaction to Faults
Hardware failures require that either the system be shut down or the failure be tolerated. I/O
failures may be tolerated by the PLC system, but they may be intolerable by the application or the
process being controlled. Operational failures are normally tolerated. Series 90-30, 90-20, and
Micro PLC faults have two attributes:
Attribute
Description
Fault Table Affected
Fault Action
I/O Fault Table
PLC Fault Table
Fatal
Diagnostic
Informational
Fault Tables
Two fault tables are maintained in the PLC for logging faults, the I/O fault table for logging faults
related to the I/O system and the PLC fault table for logging all other faults. The following table
lists the fault groups, their fault actions, the fault tables affected, and the “name” for system
discrete %S points that are affected.
Table 3-1. Fault Summary
Fault Group
Fault
Table
Special Discrete Fault References
Loss of or Missing I/O Module
Diagnostic
I/O
io_flt
any_flt
io_pres
Loss of or Missing Option Module
Diagnostic
PLC
sy_flt
any_flt
sy_pres
los_sio
System Configuration Mismatch
Fatal
PLC
sy_flt
any_flt
sy_pres
cfg_mm
PLC CPU Hardware Failure
Fatal
PLC
sy_flt
any_flt
sy_pres
hrd_cpu
Program Checksum Failure
Fatal
PLC
sy_flt
any_flt
sy_pres
pb_sum
Low Battery
Diagnostic
PLC
sy_flt
any_flt
sy_pres
low_bat
PLC Fault Table Full
Diagnostic
—
sy_full
los_iom
I/O Fault Table Full
Diagnostic
—
io_full
Application Fault
Diagnostic
PLC
sy_flt
any_flt
sy_pres
apl_flt
No User Program
Informational
PLC
sy_flt
any_flt
sy_pres
no_prog
Corrupted User RAM
Fatal
PLC
sy_flt
any_flt
sy_pres
bad_ram
Diagnostic
PLC
sy_flt
any_flt
sy_pres
bad_pwd
PLC Software Failure
Fatal
PLC
sy_flt
any_flt
sy_pres
sft_cpu
PLC Store Failure
Fatal
PLC
sy_flt
any_flt
sy_pres
stor_er
Diagnostic
PLC
sy_flt
any_flt
sy_pres
ov_swp
Unknown PLC Fault
Fatal
PLC
sy_flt
any_flt
sy_pres
Unknown I/O Fault
Fatal
I/O
io_flt
any_flt
io_pres
Password Access Failure
Constant Sweep Time Exceeded
GFK-0467M
Fault Action
Chapter 3 Fault Explanation and Correction
3-3
3
Fault Action
Faults can be fatal, diagnostic or informational.
Fatal faults cause the fault to be recorded in the appropriate table, any diagnostic variables to be set,
and the system to be halted. Diagnostic faults are recorded in the appropriate table, and any
diagnostic variables are set. Informational faults are only recorded in the appropriate table.
Possible fault actions are listed in the following table.
Table 3-2. Fault Actions
Fault Action
Response by CPU
Fatal
Log fault in fault table.
Set fault references.
Go to STOP mode.
Diagnostic
Log fault in fault table.
Set fault references.
Informational
Log fault in fault table.
When a fault is detected, the CPU uses the fault action for that fault. Fault actions are not
configurable in the Series 90-30 PLC, Series 90-20, or the Series 90 Micro PLC.
Fault References
System fault references in the Series 90-30 are of one type - fault summary references. Fault
summary references are set to indicate what fault occurred. The fault reference remains on until the
PLC is cleared or until cleared by the application program.
An example of a system fault bit being set and then cleared is shown in the following figure. In this
example, the coil, Light_01, is turned on when system contact OV_SWP (%SA0002) closes, which
indicates that an oversweep occurred. The OV_SWP contact and Light_01 coil are turned off if
contact %I0359 is closed, because closing %I0359 turns on reset coil OV_SWP.
| ov_swp
Light_01
|——] [————————————————————————————————————————————————————————————————————( )—
|
|%I0359
ov_swp
|——] [————————————————————————————————————————————————————————————————————(R)—
|
System Status References
The alarm processor maintains the states of the 128 system status bits in %S memory. Many of
these status references indicate where a fault has occurred and what type of fault it is. Status
references are assigned to %S, %SA, %SB, and %SC memory, and each reference has a nickname.
For example, status bit %SA0009 has a nickname of CFG_MM, and it goes high to indicate a
3-4
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
3
configuration mismatch. These references are available for use in the application program as
required. Refer to Chapter 2, “System Operation,” for a list of the system status references.
Additional Fault Effects
Two faults described later in this chapter have additional effects associated with them. These
effects are discussed in the following table.
Fault
PLC CPU Software Failure
Effect Description
When a PLC CPU software failure is logged, the Series 90-30 or 90-20
CPU immediately transitions into a special ERROR SWEEP mode. No
activity is permitted in this mode. The only method of clearing this
condition is to reset the PLC by cycling power.
PLC Sequence Store Failure
If, while performing a store to the PLC, communication between the
PLC and the programmer is interrupted or any other failure occurs
which terminates the download (store), the PLC Sequence Store Failure
fault is logged. As long as this fault is present in the system, the PLC
will not transition to RUN mode. To resume operation, the error must
be cleared. This can be accomplished by clearing the fault on the
applicable Fault Table Screen of the programming software.
PLC Fault Table Display
The PLC Fault Table screen displays PLC faults such as password violations, PLC/configuration
mismatches, parity errors, and communications errors.
Faults are stored in the PLC, so if the programming software is in the OFFLINE mode, no faults
are displayed in this fault table. If the programming software is in either the ONLINE or MONITOR
mode, PLC fault data is displayed. In ONLINE mode, faults can be cleared, although this feature
may be password protected.
Once cleared, faults that are still present are not logged again in the table (except for the “Low
Battery” fault) unless power is cycled or a new configuration is stored.
I/O Fault Table Display
The I/O Fault Table screen displays I/O faults such as circuit faults, address conflicts, forced
circuits, and I/O bus faults.
Faults are stored in the PLC, so if the programming software is in the OFFLINE mode, no faults
are displayed in this fault table. If the programming software is in either the ONLINE or MONITOR
mode, I/O fault data is displayed. In ONLINE mode, faults can be cleared, although this feature
may be password protected.
Once cleared, faults that are still present are not logged again in the table unless power is cycled or
a new configuration is stored.
GFK-0467M
Chapter 3 Fault Explanation and Correction
3-5
3
Accessing Additional Fault Information
The fault tables contain basic information regarding the fault. Additional information pertaining to
each fault can be displayed through the programming software. In addition, the programming
software provides a hexadecimal fault code for each fault.
The last item, “Correction”, in each fault explanation in this chapter lists the action(s) to be taken to
correct the fault. Note that the corrective action for some of the faults includes the statement:
Display the PLC Fault Table on the Programmer. Contact GE Fanuc Field
Service, giving them all the information contained in the fault entry.
This second statement means that you must tell Field Service both the information readable directly
from the fault table and the hexadecimal fault code. Field Service personnel will then give you
further instructions for the appropriate action to be taken.
The following figure of a Logicmaster fault detail screen shows the additional fault information and
hexadecimal fault code discussed above. (The fault code is the first two hexadecimal digits in the
fifth group of number from the left.) To reach this screen, select a Fault Table fault (Loss of I/O
Module) by using the keyboard cursor control arrow keys, and then “zoom” using the F10 key. To
return to the Fault Table screen, press either the Escape key or the Shift and F10 key combination.
Hexadecimal Fault Code
3-6
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
3
Section 2: PLC Fault Table Explanations
Each fault explanation contains a fault description and instructions to correct the fault. Many fault
descriptions have multiple causes. In these cases, the error code, displayed with the additional fault
information, is used to distinguish different fault conditions sharing the same fault description. The
error code is the first two hexadecimal digits in the fifth group (from the left) of numbers, as shown
in the following example.
01
000000
01030100
0902
0200
000000000000
|
|_____ Error Code (first two hex
digits in fifth group)
Some faults can occur because random access memory on the PLC CPU board has failed. These
same faults may also occur because the system has been powered off and the battery voltage is (or
was) too low to maintain memory. To avoid excessive duplication of instructions when corrupted
memory may be a cause of the error, the correction simply states:
Perform the corrections for Corrupted Memory.
This means:
1.
If the system has been powered off, replace the battery. Battery voltage may be insufficient to
maintain memory contents.
2.
Replace the PLC CPU board. The integrated circuits on the PLC CPU board may be failing.
The following table enables you to quickly find a particular PLC fault explanation in this section.
Each entry is listed as it appears on the programmer screen.
Fault Description
Loss of, or Missing, Option Module
Reset of, Addition of, or Extra, Option Module
System Configuration Mismatch
Option Module Software Failure
Program Block Checksum Failure
Low Battery Signal
Constant Sweep Time Exceeded
Application Fault
No User Program Present
Corrupted User Program on Power-Up
Password Access Failure
PLC CPU System Software Failure
Communications Failure During Store
GFK-0467M
Chapter 3 Fault Explanation and Correction
Page
3-8
3-8
3-9
3-10
3-10
3-10
3-11
3-11
3-12
3-12
3-12
3-13
3-15
3-7
3
Fault Actions
•
•
•
Fatal faults cause the PLC to enter a form of STOP mode at the end of the sweep in which
the error occurred.
Diagnostic faults are logged and corresponding fault contacts are set; the PLC stays in RUN
mode.
Informational faults are simply logged in the PLC fault table; the PLC stays in RUN mode.
Loss of, or Missing, Option Module
The Fault Group Loss of, or Missing Option Module occurs when an option module fails to
respond. The failure may occur at power-up if the module is missing or during operation if the
module fails to respond. The fault action for this group is Diagnostic.
Error Code:
1, 42
Name:
Option Module Soft Reset Failed
Description:
PLC CPU unable to re-establish communications with option module after soft
reset (such as pressing a Reset button) is tried.
Correction:
(1)
Repeat soft reset procedure recommended for this module.
(2)
Replace the option module.
(3)
Power off the system. Verify that the module is seated properly in the
rack and that all cables are properly connected and seated.
(4)
Test or replace the cables.
Error Code:
All Others
Name:
Module Failure During Configuration
Description:
The PLC operating software generates this error when a module fails
during power-up or configuration store.
Correction:
(1)
Power off the system. Replace the module located in that rack and
slot.
Reset of, Addition of, or Extra, Option Module
The Fault Group Reset of, Addition of, or Extra Option Module occurs when an option module
(PCM, ADC, etc.) comes online, is reset, or a module is found in the rack, but none is specified in
the configuration. The fault action for this group is Diagnostic.
Correction:
3-8
(1)
Update the configuration file to include the module.
(2)
Remove the module from the system.
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
3
System Configuration Mismatch
The Fault Group Configuration Mismatch occurs when the module occupying a slot is different
from that specified in the configuration file. The fault action is Fatal.
GFK-0467M
Error Code:
1
Name:
System Configuration Mismatch
Description:
The PLC operating software generates this fault when the module occupying a
slot is not of the same type that the configuration file indicates should be in that
slot, or when the configured rack type does not match the actual rack present.
Correction:
Identify the mismatch and reconfigure the module or rack.
Error Code:
6
Name:
System Configuration Mismatch
Description:
This is the same as error code 1 in that this fault occurs when the module
occupying a slot is not of the same type that the configuration file indicates
should be in that slot, or when the configured rack type does not match the actual
rack present.
Correction:
Identify the mismatch and reconfigure the module or rack.
Error Code:
18
Name:
Unsupported Hardware
Description:
A PCM or PCM-type module is present in a CPU 311, 313, or 323 system, or in
an expansion or remote rack.
Correction:
Physically correct the situation by removing the PCM or PCM-type module or
install a CPU that does support the module. NOTE: These modules must reside
only in a CPU rack and only with a CPU that supports them.
Error Code:
26
Name:
Module busy–config not yet accept by module
Description:
The module cannot accept new configuration at this time because it is
busy with a different process.
Correction:
Allow the module to complete the current operation and re-store the
configuration.
Error Code:
51
Name:
END Function Executed from Sequential Function Chart (SFC) Action
Description:
The placement of an END function in SFC logic or in logic called by SFC will
produce this fault.
Correction:
Remove the END function from the SFC logic or logic being called by the SFC
logic.
Chapter 3 Fault Explanation and Correction
3-9
3
Option Module Software Failure
The Fault Group Option Module Software Failure occurs when a non-recoverable software
failure occurs on a PCM or ADC module. The fault action for this group is Fatal.
Error Code:
All
Name:
COMMREQ Frequency Too High
Description:
COMMREQs are being sent to a module faster than it can process them.
Correction:
Change the PLC program to send COMMREQs to the affected module
at a slower rate.
Program Block Checksum Failure
The Fault Group Program Block Checksum Failure occurs when the PLC CPU detects error
conditions in program blocks received by the PLC (downloaded by the programming software). It
also occurs when the PLC CPU detects checksum errors during power-up verification of memory
or during RUN mode background checking. The fault action for this group is Fatal.
Error Code:
All
Name:
Program Block Checksum Failure
Description:
The PLC Operating Software generates this error when a program block is
corrupted.
Correction:
(1)
Clear PLC memory and retry the store.
(2)
Display the PLC fault table on the programmer. Contact GE Fanuc
PLC Field Service, giving them all the information contained in the
fault entry.
Low Battery Signal
The Fault Group Low Battery Signal occurs when the PLC CPU detects a low battery on the PLC
power supply or a module, such as the PCM, reports a low battery condition. The fault action for
this group is Diagnostic.
3-10
Error Code:
0
Name:
Failed Battery Signal
Description:
The CPU module (or other module having a battery) battery is dead.
Correction:
Replace the battery. Do not remove power from the rack.
Error Code:
1
Name:
Low Battery Signal
Description:
A battery on the CPU, or other module has a low signal.
Correction:
Replace the battery. Do not remove power from the rack.
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
3
Constant Sweep Time Exceeded
The Fault Group Constant Sweep Time Exceeded occurs when the PLC CPU operates in
CONSTANT SWEEP mode, and it detects that the sweep has exceeded the constant sweep timer.
The fault extra data contains the actual time of the sweep in the first two bytes and the name of the
program in the next eight bytes. The fault action for this group is Diagnostic.
Correction:
(1)
Increase constant sweep time.
(2)
Remove logic from application program.
Application Fault
The Fault Group Application Fault occurs when the PLC CPU detects a fault in the user program.
The fault action for this group is Diagnostic, except when the error is a Subroutine Call Stack
Exceeded, in which case it is Fatal.
Error Code:
7
Name:
Subroutine Call Stack Exceeded
Description:
Subroutine calls are limited to a depth of 8. A subroutine can call another
subroutine which, in turn, can call another subroutine until 8 call levels
are attained.
Correction:
Modify program so that subroutine call depth does not exceed 8.
Error Code:
Name:
Description:
1B
CommReq Not Processed Due To PLC Memory Limitations
No-wait communication requests can be placed in the queue faster than they can
be processed (e.g., one per sweep). In a situation like this, when the
communication requests build up to the point that the PLC has less than a
minimum amount of memory available, the communication request will be
faulted and not processed
Issue fewer communication requests or otherwise reduce the amount of mail
being exchanged within the system.
Correction:
Error Code:
Name:
Description:
Correction:
GFK-0467M
5A
User Shut Down Requested
The PLC operating software (function blocks) generates this informational alarm
when Service Request #13 (User Shut Down) executes in the application
program.
None required. Information-only alarm.
Chapter 3 Fault Explanation and Correction
3-11
3
No User Program Present
The Fault Group No User Program Present occurs when the PLC CPU is instructed to transition
from STOP to RUN mode or a store to the PLC and no user program exists in the PLC. The PLC
CPU detects the absence of a user program on power-up. The fault action for this group is
Informational.
Correction:
Download an application program before attempting to go to RUN mode.
Corrupted User Program on Power-Up
The Fault Group Corrupted User Program on Power-Up occurs when the PLC CPU detects
corrupted user RAM. The PLC CPU will remain in STOP mode until a valid user program and
configuration file are downloaded. The fault action for this group is Fatal.
Error Code:
1
Name:
Corrupted User RAM on Power-Up
Description:
The PLC operating software (operating software) generates this error when it
detects corrupted user RAM on power-up.
Correction:
(1)
Reload the configuration file, user program, and references (if any).
(2)
Replace the battery on the PLC CPU.
(3)
Replace the expansion memory board on the PLC CPU.
(4)
Replace the PLC CPU.
Error Code:
2
Name:
Illegal Boolean OpCode Detected
Description:
The PLC operating software (operating software) generates this error when it
detects a bad instruction in the user program.
Correction:
(1)
Restore the user program and references (if any).
(2)
Replace the expansion memory board on the PLC CPU.
(3)
Replace the PLC CPU.
Password Access Failure
The Fault Group Password Access Failure occurs when the PLC CPU receives a request to
change to a new privilege level and the password included with the request is not valid for that
level. The fault action for this group is Informational.
Correction:
3-12
Retry the request with the correct password.
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
3
PLC CPU System Software Failure
Faults in the Fault Group PLC CPU System Software Failure are generated by the operating firmware
of the Series 90-30, 90-20 or Micro PLC CPU. They can occur at many different points of system
operation. When a Fatal fault occurs, the PLC CPU immediately transitions into a special ERROR
SWEEP mode. No activity is permitted when the PLC is in this mode. The only way to clear this
condition is to cycle power on the PLC. The fault action for this group is Fatal.
Error Code:
Name:
Description:
Correction:
Error Code:
Name:
Description:
Correction:
Error Code:
Name:
Description:
Correction:
Error Code:
Name:
Description:
Correction:
Error Code:
Name:
Description:
Correction:
GFK-0467M
1 through B
User Memory Could Not Be Allocated
The PLC operating software (memory manager) generates these errors when
software requests the memory manager to allocate or de-allocate a block or blocks
of memory from user RAM that are not legal. These errors should not occur in
released products; they are normally encountered only during the firmware
development process at the factory.
Display the PLC fault table on the programmer. Contact GE Fanuc PLC Field
Service, giving them all the information contained in the fault entry.
D
System Memory Unavailable
The PLC operating software (I/O Scanner) generates this error when its request
for a block of system memory is denied by the memory manager because no
memory is available from the system memory heap. It is Informational if the error
occurs during the execution of a DO I/O function block. It is Fatal if it occurs
during power-up initialization or autoconfiguration.
Display the PLC fault table on the programmer. Contact GE Fanuc PLC Field
Service, giving them all the information contained in the fault entry.
E
System Memory Could Not Be Freed
The PLC operating software (I/O Scanner) generates this error when it requests
the memory manager to de-allocate a block of system memory
and the de-allocation fails. This error can only occur during the execution
of a DO I/O function block.
(1) Display the PLC fault table on the programmer. Contact GE Fanuc
PLC Field Service, giving them all the information contained in the
fault entry.
(2) Perform the corrections for corrupted memory.
10
Invalid Scan Request of the I/O Scanner
The PLC operating software (I/O Scanner) generates this error when the operating
system or DO I/O function block scan requests neither a full nor a partial scan of
the I/O. This should not occur in a production system.
Display the PLC fault table on the programmer. Contact GE Fanuc PLC Field
Service, giving them all the information contained in the fault entry.
13
PLC Operating Software Error
The PLC operating software generates this error when certain PLC
operating software problems occur. This error should not occur in released
products; they are normally encountered only during the firmware development
process at the factory.
(1) Display the PLC fault table on the programmer. Contact GE Fanuc
PLC Field Service, giving them all the information contained in the
fault entry.
(2) Perform the corrections for corrupted memory.
Chapter 3 Fault Explanation and Correction
3-13
3
Error Code:
Name:
Description:
Correction:
Error Code:
Name:
Description:
Correction:
Error Code:
Name:
Description:
Correction:
Error Code:
Name:
Description:
Correction:
Error Code:
Name:
Description:
Correction:
Error Code:
Name:
Description:
Correction:
3-14
14, 27
Corrupted PLC Program Memory
The PLC operating software generates these errors when certain PLC
operating software problems occur. These errors should not occur in released
products; they are normally encountered only during the firmware development
process at the factory.
(1) Display the PLC fault table on the programmer. Contact GE Fanuc
PLC Field Service, giving them all the information contained in the
fault entry.
(2) Perform the corrections for corrupted memory.
27 through 4E
PLC Operating Software Error
The PLC operating software generates these errors when certain PLC
operating software problems occur. These errors should not occur in released
products; they are normally encountered only during the firmware development
process at the factory.
Display the PLC fault table on the programmer. Contact GE Fanuc PLC Field
Service, giving them all the information contained in the fault entry.
4F
Communications Failed
The PLC operating software (service request processor) generates this
error when it attempts to comply with a request that requires backplane
communications and receives a rejected response.
(1) Check the bus for abnormal activity.
(2) Replace the intelligent option module to which the request was
directed.
50, 51, 53
System Memory Errors
The PLC operating software generates these errors when its request for a block of
system memory is denied by the memory manager because no memory is
available or contains errors.
(1) Display the PLC fault table on the programmer. Contact GE Fanuc
PLC Field Service, giving them all the information contained in the
fault entry.
(2) Perform the corrections for corrupted memory.
52
Backplane Communications Failed
The PLC operating software (service request processor) generates this
error when it attempts to comply with a request that requires backplane
communications and receives a rejected mail response.
(1) Check the bus for abnormal activity.
(2) Replace the intelligent option module to which the request was
directed.
(3) Check parallel programmer cable for proper attachment.
All Others
PLC CPU Internal System Error
An internal system error has occurred that should not occur in a
production system.
Display the PLC fault table on the programmer. Contact GE Fanuc PLC Field
Service, giving them all the information contained in the fault entry.
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
3
Communications Failure During Store
The Fault Group Communications Failure During Store occurs during the store of program
blocks and other data to the PLC. If communications with the programming device performing the
store is interrupted or any other failure occurs which terminates the load, this fault is logged. As
long as this fault is present in the system, the controller will not transition to RUN mode.
This fault is not automatically cleared on power-up; the user must specifically order the condition
to be cleared. The fault action for this group is Fatal. For additional information on this fault,
please see the “Additional Fault Effects” section earlier in this chapter.
Correction:
GFK-0467M
Clear the fault and retry the download of the program or configuration file.
Chapter 3 Fault Explanation and Correction
3-15
3
Section 3: I/O Fault Table Explanations
The I/O fault table reports data about faults in three classifications:
•
Fault category.
•
Fault type.
•
Fault description.
The faults described on the following page have a fault category, but do not have a fault type or
fault group.
Each fault explanation contains a fault description and instructions to correct the fault. Many fault
descriptions have multiple causes. In these cases, the error code, displayed with the additional fault
information obtained by pressing CTRL-F, is used to distinguish different fault conditions sharing
the same fault description. (For more information about using CTRL-F, refer to Appendix B,
“Interpreting Fault Tables,” in this manual.) The Fault Category is the first two hexadecimal digits
in the fifth group of numbers, as shown in the following example.
02
1F0100
00030101FF7F
0302
0200
84000000000003
|
|_____ Fault Category (first two hex
digits in fifth group)
The following table enables you to quickly find a particular I/O fault explanation in this section.
Each entry is listed as it appears on the programmer screen.
Loss of I/O Module
The Fault Category Loss of I/O Module applies to Model 30 discrete and analog I/O modules.
There are no fault types or fault descriptions associated with this category. The fault action is
Diagnostic.
3-16
Description:
The PLC operating software generates this error when it detects that a Model 30
I/O module is no longer responding to commands from the
PLC CPU, or when the configuration file indicates an I/O module is to
occupy a slot and no module exists in the slot.
Correction:
(1)
Replace the module.
(2)
Correct the configuration file.
(3)
Display the PLC fault table on the programmer. Contact GE Fanuc
PLC Field Service, giving them all the information contained in the
fault entry.
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
3
Addition of I/O Module
The Fault Category Addition of I/O Module applies to Model 30 discrete and analog I/O modules.
There are no fault types or fault descriptions associated with this category. The fault action is
Diagnostic.
GFK-0467M
Description:
The PLC operating software generates this error when an I/O module which had
been faulted returns to operation.
Correction:
(1)
No action necessary if the module was removed or replaced,
or the remote rack was power cycled.
(2)
Update the configuration file or remove the module.
Description:
The PLC operating software generates this error when it detects a Model 30 I/O
module in a slot which the configuration file indicates should be empty.
Correction:
(1)
Remove the module if it is there by mistake.
(2)
Update and restore the configuration file to include the extra
module if it is supposed to be there.
Chapter 3 Fault Explanation and Correction
3-17
Chapter
Relay Functions
4
This chapter explains the use of contacts, coils, and links in ladder logic rungs.
Function
Page
Coils and negated coils.
4-2
Normally open and normal closed contacts.
4-1
Retentive and negated retentive coils.
4-4
Positive and negative transition coils.
4-5
SET and RESET coils.
4-6
Retentive SET and RESET coils.
4-7
Horizontal and vertical links.
4-7
Continuation coils and contacts.
4-8
Using Contacts
A contact is used to monitor the state of a reference. Whether the contact passes power flow
depends on the state or status of the reference being monitored and on the contact type. A reference
is ON if its state is 1; it is OFF if its state is 0.
Table 4-1. Types of Contacts
GFK-0467M
Type of Contact
Display
Normally Open
—| |—
Normally Closed
—|/|—
Continuation Contact
<+>———
Contact Passes Power to Right
When reference is ON.
When reference is OFF.
If the preceding continuation coil is set ON.
4-1
4
Using Coils
Coils are used to control discrete references such as %Q and %M memory types. Conditional logic
must be used to control the flow of power to a coil. Coils cause action directly; they do not pass
power flow to the right. If additional logic in the program should be executed as a result of the coil
condition, an internal reference (contact) should be used for that coil or a continuation coil/contact
combination may be used.
Coils are always located at the rightmost position of a line of logic. A rung may contain up to eight
coils.
The type of coil used will depend on the type of program action desired. The states of retentive
coils are saved when power is cycled or when the PLC goes from STOP to RUN mode. The states
of non-retentive coils are set to zero when power is cycled or the PLC goes from STOP to RUN
mode.
Table 4-2. Types of Coils
Type of Coil
Display
Power to Coil
Normally
—()—
ON
Sets reference ON.
OFF
Sets reference OFF.
ON
Sets reference OFF.
OFF
Sets reference ON.
Open
Negated
Retentive
Negated
—(/)—
—(M)—
—(/M)—
Retentive
ON
Sets reference ON, retentive.
OFF
Sets reference OFF, retentive.
ON
Sets reference OFF, retentive.
OFF
Sets reference ON, retentive.
Positive
Transition
—(↑)—
OFF→ON
If reference is OFF, sets it ON for one sweep.
Negative
Transition
—(↓)—
ON←OFF
If reference is OFF, sets it ON for one sweep.
SET
—(S)—
ON
Sets reference ON until reset OFF by —(R)—.
OFF
Does not change the coil state.
RESET
—(R)—
ON
Sets reference OFF until set ON by —(S)—.
OFF
Does not change the coil state.
Sets reference ON until reset OFF by —(RM)—,
retentive.
Retentive SET
—(SM)—
ON
OFF
Does not change the coil state.
Retentive
—(RM)—
ON
Sets reference OFF until set ON by —(SM)—,
retentive.
OFF
Does not change the coil state.
ON
Sets next continuation contact ON.
OFF
Sets next continuation contact OFF.
RESET
Continuation
Coil
4-2
Result
——<+>
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
4
Normally Open Contact —| |—
A normally open contact acts as a switch that passes power flow if the associated reference is
ON (at logic 1).
Normally Closed Contact —|/|—
A normally closed contact acts as a switch that passes power flow if the associated reference is
OFF (at logic 0).
Example
The following example shows a rung with 10 elements having nicknames (see Chapter 2 for
information on nicknames) from E1 to E10. Coil E10 is ON when reference E1, E2, E5, E6, and
E9 are ON and references E3, E4, E7, and E8 are OFF.
|
| E1
E2
E3
E4
E5
E6
E7
E8
E9
E10
|——| |—————| |—————|/|—————|/|—————| |—————| |—————|/|—————|/|—————| |—————( )—
|
Coil —( )—
A coil sets a discrete reference ON while it receives power flow. It is non-retentive; therefore, it
cannot be used with system status references (%SA, %SB, %SC) or global Genius references (%G).
Example
In the following example, coil E3 is ON when reference E1 is ON and reference E2 is OFF.
|
| E1
E2
E3
|——| |—————|/|—————————————————————————————————————————————————————————————( )—
|
GFK-0467M
Chapter 4 Relay Functions
4-3
4
Negated Coil —(/)—
A negated coil sets a discrete reference ON when it does not receive power flow. It is not retentive;
therefore, it cannot be used with system status references (%SA, %SB, %SC), or global Genius
references (%G).
Example
In the following example, coil E3 is ON when reference E1 is OFF.
|
| E1
E2
|——| |—————————————————————————————————————————————————————————————————————(/)—
|
| E2
E3
|——| |—————————————————————————————————————————————————————————————————————( )—
|
Retentive Coil —(M)—
Like a normally open coil, the retentive coil sets a discrete reference ON while it receives power
flow. The state of the retentive coil is retained across power failure. Therefore, it cannot be used
with references from strictly non-retentive memory (%T).
Negated Retentive Coil —(/M)—
The negated retentive coil sets a discrete reference ON when it does not receive power flow. The
state of the negated retentive coil is retained across power failure. Therefore, it cannot be used with
references from strictly non-retentive memory (%T).
Positive Transition Coil —(↑
↑)—
If the reference associated with a positive transition coil is OFF, when the coil receives power flow
it is set to ON. Any contacts associated with that coil will change state for one PLC scan (sweep).
(If the rung containing the coil is skipped on subsequent sweeps, it will remain ON.) This coil can
be used as a one-shot.
Each reference should only be used as a transition coil once in the application program, so as to
preserve the one-shot nature of the coil.
Transitional coils can be used with references from either retentive or non-retentive memory (%Q,
%M, %T, %G, %SA, %SB, or %SC).
4-4
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
4
Negative Transition Coil —(↓
↓)—
If the reference associated with this coil is OFF, when the coil stops receiving power flow, the
reference is set to ON and any contacts associated with that coil will change state for one sweep.
A reference used with a transition coil should only be used as a coil once in the application
program, so as to preserve the one-shot nature of the coil.
Transitional coils can be used with references from either retentive or non-retentive memory (%Q,
%M, %T, %G, %SA, %SB, or %SC).
Example
In the following example, when reference E1 goes from OFF to ON, coils E2 and E3 receive power
flow, turning E2 ON for one logic sweep. When E1 goes from ON to OFF, power flow is removed
from E2 and E3, turning coil E3 ON for one sweep.
|
|
E1
E2
|——| |—————————————————————————————————————————————————————————————————(↑
↑)—
|
|
E1
E3
|——| |———————————————————————————————————————(↓
↓)—
|
SET Coil —(S) —
SET and RESET are non-retentive coils that can be used to keep (“latch”) the state of a reference
either ON or OFF. When a SET coil receives power flow, its reference stays ON (whether or not
the coil itself continues to receive power flow) until the reference is reset by another coil.
RESET Coil —(R)—
The RESET coil sets a discrete reference OFF if the coil receives power flow. The reference
remains OFF until the reference is reset by another coil. The last-solved SET coil or RESET coil of
a pair takes precedence.
GFK-0467M
Chapter 4 Relay Functions
4-5
4
Example
In the following example, the coil represented by E1(S) is turned ON if E2 turns ON. Even if E2
turns OFF, coil E1 stays ON until coil E1(R ) is energized by E3.
NOTE: If both E2 and E3 were ON at the same time, coil E1 would be OFF. This is because rungs
are scanned from top to bottom, so the status of the reset coil in the second rung is the last one to be
written to the output table. If the order of the rungs was reversed, the set coil would be the last one
scanned, so E1 would be ON if E2 and E3 were both ON at the same time.
|
| E2
E1
|——| |———————————————————————————————————————————————————————————————————(S)—
|
|
|
|
| E3
E1
|——| |———————————————————————————————————————————————————————————————————(R)—
|
|
|
|
Note
When the level of coil checking is SINGLE, you can use a specific %M or %Q
reference with only one Coil, but you can use it with one SET Coil and one
RESET Coil simultaneously. When the level of coil checking is WARN
MULTIPLE or MULTIPLE, then each reference can be used with multiple Coils,
SET Coils, and RESET Coils. With multiple usage, a reference could be turned
ON by either a SET Coil or a normal Coil and could be turned OFF by a RESET
Coil or by a normal Coil.
Retentive SET Coil —(SM)—
Retentive SET and RESET coils are similar to SET and RESET coils, but they are retained across
power failure or when the PLC transitions from STOP to RUN mode. A retentive SET coil sets a
discrete reference ON if the coil receives power flow. The reference remains ON until reset by a
retentive RESET coil.
Retentive SET coils write an undefined result to the transition bit for the given reference. (Refer to
the information on “Transitions and Overrides” in chapter 2, “System Operation.”)
Retentive RESET Coil —(RM)—
This coil sets a discrete reference OFF if it receives power flow. The reference remains OFF until
set by a retentive SET coil. The state of this coil is retained across power failure or when the PLC
transitions from STOP to RUN mode.
4-6
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
4
Retentive RESET coils write an undefined result to the transition bit for the given reference. (Refer
to the information on “Transitions and Overrides” in chapter 2, “System Operation.”)
Links
Horizontal and vertical links, which appear as straight lines on-screen, are used to connect elements
of a line of ladder logic between functions. Their purpose is to complete the flow of logic
(“power”) from left to right in a line of logic.
Note
You can not use a horizontal link to tie a function or coil to the left power rail.
You can, however, use %S7, the AWL_ON (always on) system bit with a
normally open contact tied to the power rail to call a function every sweep.
Example
Several links are used in the following example:
•
Horizontal links connect contact E2 to contact E5, and contact E5 to coil E1.
•
Vertical links connect contact E8 across contact E6, contact E9 across contact E7, and the
right side of contacts E7/E9 to the junction of contacts E2 and E5.
Horizontal Links
E2
E3
E5
E6
E7
E8
E9
E1
Vertical Links
GFK-0467M
Chapter 4 Relay Functions
4-7
4
Continuation Coils (———<+>) and Contacts (<+>———)
Continuation coils (—————<+>) and continuation contacts (<+>———) are used to continue relay
ladder rung logic beyond the limit of ten columns. The state of the last executed continuation coil is
the flow state that will be used on the next executed continuation contact. There needs to be a
continuation coil before the logic executes a continuation contact. The state of the continuation
contact is cleared when the PLC transitions from Stop to Run, and there will be no flow unless the
transition coil has been set since going to Run mode.
There can be only one continuation coil and contact per rung; the continuation contact must be in
column 1, and the continuation coil must be in column 10. An example continuation coil and
contact are shown below:
4-8
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
Chapter
Timers and Counters
5
This chapter explains how to use on-delay and stopwatch-type timers, up counters, and down
counters. The data associated with these functions is retentive through power cycles.
Abbreviation
Function
Page
ONDTR
Retentive On-Delay Timer
5-3
TMR
OFDT
UPCTR
DNCTR
Simple On-Delay Timer
Off-Delay Timer
Up Counter
Down Counter
5-5
5-8
5-11
5-13
Function Block Data Required for Timers and Counters
Each timer or counter uses three words (registers) of %R memory to store the following
information:
current value (CV)
word 1
preset value (PV)
word 2
control word
word 3
When you enter a timer or counter, you must enter a beginning address (the address for word 1) for
this three-word block directly below the graphic representing the function. In the following
example, this beginning address is %R00100.
Enable
ONDTR
0.10s
Reset
R
Preset
Value
PV
Q
%R00100
Note
Make sure that the addresses in the three-word block are not used elsewhere in
your program (this duplicate use is called “overlapping”). Logicmaster does not
check or warn you if register blocks overlap. Timers and counters will not work
correctly if you overlap their three-word blocks.
GFK-0467M
5-1
5
The control word (the third word in the three-word block) stores the state of the Boolean inputs and
outputs of its associated function block, as shown in the following format:
15 14 13 12 11 10
9
7
8
6
5
4
3
2
1
0
Reserved
Reset input
Enable input,
previous execution
Reserved
Q (counter/timer
status output)
EN (enable input)
Bits 0 through 11 are reserved by the PLC for use in maintaining timer accuracy; these bits (0
through 11) are not used for counter function blocks.
Note
Use care if you use the same address for the function’s PV (Preset Value) input
parameter as the second word in the three-word block. If PV is not a constant,
the PV input normally is addressed to a different memory location than the
second word. Some programmers choose to use the second word address for the
PV input, such as using %R0102 when the three-word block starts at %R0101.
This allows an application to change the PV while the timer or counter is
running. Applications can read the first (CV) or third (Control) words, but the
application cannot write to these values, because if they were written to, the
function would not work.
Special Note on Certain Bit Operations
When using the Bit Test, Bit Set, Bit Clear or Bit Position function, the bits
are numbered 1 through 16, NOT 0 through 15 as shown above.
5-2
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
5
ONDTR
A retentive on-delay timer (ONDTR) increments while it receives power flow and holds its value
when power flow stops. Time may be counted in tenths of a second (the default selection),
hundredths of a second, or thousandths of a second. The range is 0 to +32,767 time units;
therefore, the timing range is 0.001 to 3,276.7 seconds. The state of this timer is retentive on
power failure; no automatic initialization occurs at power-up.
When the ONDTR first receives power flow, it starts accumulating time (current value). When this
timer is encountered in the ladder logic, its current value is updated.
Note
If multiple occurrences of the same timer with the same reference address are
enabled during a CPU sweep, the current values of the timers will be the same.
When the current value equals or exceeds the preset value PV, output Q is energized. As long as
the timer continues to receive power flow, it continues accumulating until the maximum value is
reached. Once the maximum value is reached, it is retained and output Q remains energized
regardless of the state of the enable input.
a42931
ENABLE
RESET
Q
A
B
C
D
E
F G
H
A =
ENABLE goes high; timer starts accumulating.
B =
CV reaches PV; Q goes high.
C =
RESET goes high; Q goes low, accumulated time is reset.
D =
RESET goes low; timer then starts accumulating again.
E =
ENABLE goes low; timer stops accumulating. Accumulated time stays the same.
F
ENABLE goes high again; timer continues accumulating time.
=
G =
CV becomes equal to PV; Q goes high. Timer continues to accumulate time until
ENABLE goes low, RESET goes high, or CV becomes equal to the maximum time.
H =
ENABLE goes low; timer stops accumulating time.
When power flow to the timer stops, the current value stops incrementing and is retained. Output
Q, if energized, will remain energized. When the function receives power flow again, the current
value again increments, beginning at the retained value. When reset R receives power flow, the
current value is set back to zero and output Q is de-energized. On 35x, 36x, and 37x series PLCs,
if the enable to the ONDTR is low, PV = 0 and reset R receives power-flow, then the output will be
low. However, on the 311–341 PLCs, under these same conditions, the output will be high.
GFK-0467M
Chapter 5 Timers and Counters
5-3
5
Enable
Q
ONDTR
0.10s
Time Base
R
Reset
PV
Preset Value
Address of
Three-Word
Block
Parameters
Parameter
Address of
Three-Word
Block
Description
The ONDTR uses three consecutive words (registers) of %R memory to store the
following:
•
Current value (CV) = word 1.
•
Preset value (PV)
= word 2.
•
Control word
= word 3.
When you enter an ONDTR, you must enter an address for the location of the first of
three consecutive words (registers) directly below the graphic representing the
function (the use of the other two words is implied).
Caution: Do not write to these three words with other instructions. Overlapping these
references will result in erratic operation of the timer.
Enable
When enable receives power flow, the timer begins functioning.
R
Reset input. When R receives power flow, it resets the current value to zero. Input R, if
used, must be connected by one or more contacts to the power rail. This requires that the
ONDTR instruction be placed in the first position (left-most position) in the rung.
PV
Preset Value input. PV is the value to copy into the timer’s preset value when the timer
is enabled or reset. The timer will turn on the Q output when it times to the PV value.
Q
Output Q is energized when the current value (CV) is greater than or equal to the
preset value (PV).
Time Base
This parameter may be programmed for time increment of tenths (0.1), hundredths
(0.01), or thousandths (0.001) of seconds. This time base value is multiplied by the
number in the Preset Value (PV) input parameter to determine the actual preset value.
Valid Memory Types
Parameter
flow
%I
%Q
%M
%T
%S
%G
address
•
R
•
PV
5-4
%AI %AQ const
none
•
enable
Q
%R
•
•
•
•
•
•
•
•
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
•
•
•
•
GFK-0467M
5
•
Valid reference or place where power may flow through the function.
Example
In the following example, a retentive on-delay timer is used to produce an output (%Q0011) that
turns on 8.0 seconds after %Q0010 turns on, and turns off when %Q0010 turns off. This is because
when %Q0010 turns off, its normally closed contact passes power to the reset (R) input. The 8.0
second time value is obtained by multiplying the PV value (80) times the time base value (0.1s).
|
_____
| %Q0010 |
|
%Q0011
|——| |———|ONDTR|———————————————————————————————————————————————————————————( )—
|
| 0.1s|
| %Q0010 |
|
|——|/|———|R
|
|
|
|
|
|
|
| CONST —|PV
|
| +00080 |_____|
|
|
%R0004
TMR
The simple on-delay timer (TMR) function increments while it receives power flow and resets to
zero when power flow stops. Time may be counted in tenths of a second (the default selection),
hundredths of a second, or thousandths of a second. The range is 0 to +32,767 time units, therefore
the timing range is 0.001 to 3,276.7 seconds. The state of this timer is retentive on power failure;
no automatic initialization occurs at power-up.
When the TMR receives power flow, the timer starts accumulating time (current value). The
current value is updated when it is encountered in the logic to reflect the total elapsed time the
timer has been enabled since it was last reset.
Note
If multiple occurrences of the same timer with the same reference address are
enabled during a CPU sweep, the current values of the timers will be the same.
The timer’s elapsed time value (CV - current value) continues to accumulate as long as the
enabling logic remains ON. When the current value (CV) equals or exceeds the preset value (PV),
the function begins passing power flow to the right. The timer continues accumulating time until
the maximum value (32,767 time units) is reached. When the enabling input transitions from ON
to OFF, the timer stops accumulating time and the current value is reset to zero.
a42933
ENABLE
Q
A
A
B
GFK-0467M
=
B
C
D
E
=
ENABLE goes high; timer begins accumulating time.
Current value reaches preset value PV; Q goes high, and timer continues accumulating time.
Chapter 5 Timers and Counters
5-5
5
C
=
D
E
=
ENABLE goes low; Q goes low; timer stops accumulating time and current time is cleared.
=
ENABLE goes high; timer starts accumulating time.
ENABLE goes low before current value reaches preset value PV; Q remains low; timer stops
accumulating time and is cleared to zero.
Enable
Q
TMR
0.10s
Time Base
PV
Preset Value
Address of
Three-Word
Block
Parameters
Parameter
Description
Address of
Three-Word
Block
The TMR uses three consecutive words (registers) of %R memory to store the following:
•
Current value (CV) = word 1.
•
Preset value (PV)
= word 2.
•
Control word
= word 3.
When you enter an ONDTR, you must enter an address for the location of the first of
three consecutive words (registers) directly below the graphic representing the
function (the use of the other two words is implied).
Caution: Do not write to these three words with other instructions. Overlapping these
references will result in erratic operation of the timer.
Enable
When enable receives power flow, the timer begins functioning. When the enable input
goes off, the current value is reset to zero and Q is turned off.
PV
Preset Value input. PV is the value to copy into the timer’s preset value when the timer
is enabled or reset. The timer will turn on the Q output when it times to the PV value.
Q
Output Q is energized when the current value (CV) is greater than or equal to the
preset value (PV).
Time Base
This parameter may be programmed for time increment of tenths (0.1), hundredths
(0.01), or thousandths (0.001) of seconds. This time base value is multiplied by the
number in the Preset Value (PV) input parameter to determine the actual preset value.
Valid Memory Types
Parameter
flow
%I
%Q
%M
%T
%S
%G
address
enable
Q
5-6
%AI %AQ const
none
•
•
PV
•
%R
•
•
•
•
•
•
•
•
•
•
•
•
Valid reference or place where power may flow through the function.
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
5
Example
In the following example, a TMR timer is used to control the length of time that coil DWELL is on.
The timing process starts when the normally open (momentary) contact DO_DWL turns on, which
turns on coil DWELL. A DWELL contact keeps coil DWELL energized (“latched”) when contact
DO_DWL opens; also, another DWELL contact enables the timer. When the timer reaches its
preset value of one-half second, coil REL energizes. The normally closed REL contact opens,
interrupting the latched-on condition of coil DWELL, which turns off. The DWELL contact on the
timer’s enable input opens, which interrupts power flow to the timer, resets its current value, and
de-energizes coil REL. The circuit is then ready for another activation of contact DO_DWL.
|
| DO_DWL
REL
DWELL
|——| |——+——|/|—————————————————————————————————————————————————————————————( )—
|
|
| DWELL |
|——| |——+
|
_____
| DWELL |
|
REL
|——| |———| TMR |———————————————————————————————————————————————————————————( )—
|
| 0.1s|
|
|
|
| CONST —|PV
|
| +00005 |_____|
|
|
TMRID
GFK-0467M
Chapter 5 Timers and Counters
5-7
5
OFDT
The off-delay timer’s (OFDT) accumulated value increments while power flow is off, and resets to
zero when power flow is on. Time may be counted in tenths of a second (the default selection),
hundredths of a second, or thousandths of a second. The range is 0 to +32,767 time units, which
gives a range of .001 to 3,276.7 seconds. The state of this timer is retentive on power failure; no
automatic initialization occurs at power-up.
When the OFDT first receives power flow, it passes power to the right, and the current value (CV)
is set to zero. (The OFDT uses word 1 [register] as its CV storage location—see the “Parameters”
section on the next page for additional information.) The output remains on as long as the function
receives power flow. If the function stops receiving power flow from the left, its output remains on
temporarily, and the timer starts accumulating time in the current value; once the accumulated
value reaches the preset value, the output turns off.
Note
If multiple occurrences of the same timer with the same reference address are
enabled during a CPU sweep, the current values of the timers will be the same.
The OFDT does not pass power flow if the preset value is zero or negative.
Each time the function is invoked by turning off the enabling logic (at the enable input), the current
value is updated to reflect the elapsed time since the timer was turned off. When the current value
(CV) is equal to the preset value (PV), the function stops passing power flow to the right. When
that occurs, the timer stops accumulating time—see Part C below.
When the function receives power flow again, the current value resets to zero.
a42932
ENABLE
Q
A
A
B
C
D
E
F
G
H
5-8
=
=
=
=
=
=
=
=
B
C
D
E
F G
H
ENABLE and Q both go high ; timer is reset (CV = 0).
ENABLE goes low; timer starts accumulating time.
CV value equals PV value; Q goes low, and timer stops accumulating time.
ENABLE goes high; timer is reset (CV = 0), Q goes high.
ENABLE goes low; timer starts accumulating time, Q stays high.
ENABLE goes high; timer is reset (CV = 0), Q stays high.
ENABLE goes low; timer starts accumulating time, Q stays high.
CV value equals PV value; Q goes low, and timer stops accumulating time.
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
5
Enable
Q
OFDT
0.10s
Time Base
Preset Value
PV
Address of
Three-Word
Block
When the OFDT is used in a program block that is not called every sweep, the timer accumulates
time between calls to the program block unless it is reset. This means that it functions like a timer
operating in a program with a much slower sweep than the timer in the main program block. For
program blocks that are inactive for a long time, the timer should be programmed to allow for this
catch-up feature. For example, if a timer in a program block is reset and the program block is not
called (is inactive) for four minutes, when the program block is called, four minutes of time will
already have accumulated. This time is applied to the timer when enabled, unless the timer is first
reset.
Parameters
Parameter
Address of
Three-Word
Block
Description
The OFDT timer uses three consecutive words (registers) of %R memory to store the
following:
•
Current value (CV) = word 1.
•
Preset value (PV)
= word 2.
•
Control word
= word 3.
When you enter an OFDT, you must enter an address for the location of the first of
three consecutive words (registers) directly below the graphic representing the
function (the use of the other two words is implied).
Caution: Do not write to these three words with other instructions. Overlapping these
references will result in erratic operation of the timer.
GFK-0467M
Enable
While the enable input is on, output Q stays on, and the current value (CV) is held to
zero. When the enable input turns off, the timer begins timing. When the current value
(CV) reaches the preset value (PV), the timer stops timing, and Q turns off.
PV
Preset Value input. PV is the value to copy into the timer’s preset value when the timer
is enabled or reset. The timer will turn off the Q output when it times to the PV value.
Q
Output Q is energized (1) when the enable input is on and (2) while the current value
(CV) is less than the preset value (PV) after the enable input turns off.
Time Base
This parameter may be programmed for time increment of tenths (0.1), hundredths
(0.01), or thousandths (0.001) of seconds. This time base value is multiplied by the
number in the Preset Value (PV) input parameter to determine the actual preset value.
Chapter 5 Timers and Counters
5-9
5
Valid Memory Types
Parameter
flow
%I %Q %M %T
%S
%G %R
address
•
%AI
%AQ
const
none
•
•
•
•
•
enable
•
PV
•
Q
•
•
•
•
•
•
•
•
Valid reference or place where power may flow through the function.
Examples
In the following example, an OFDT timer turns on output coil %Q0001 whenever contact %I0001
is closed. After %I0001 opens, %Q0001 stays on for 2 seconds then turns off.
%Q0001
%I0001
OFDT
0.10s
CONST
+00020
PV
%R0019
In the next example, the output action is reversed by the use of a negated output coil. In this
circuit, an OFDT timer turns off negated output coil %Q0001 whenever contact %I0001 is closed.
After %I0001 opens, %Q0001 stays off for 2 seconds then turns on.
%Q0001
%I0001
OFDT
0.10s
CONST
+00020
PV
%R0019
5-10
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
5
UPCTR
The Up Counter (UPCTR) function is used to count up to a designated value. The range is 0 to
+32,767 counts. When the up counter reset is ON, the current value of the counter is reset to 0.
Each time the enable input transitions from OFF to ON, the current value is incremented by 1. The
current value can be incremented past the preset value PV. The output is ON whenever the current
value is greater than or equal to the preset value.
The state of the UPCTR is retentive on power failure; no automatic initialization occurs at powerup.
Enable
UPCTR
Reset
R
Preset
Value
PV
Q
Address of
Three-Word
Block
Parameters
Parameter
Address of
Three-Word
Block
Description
The UPCTR Up Counter uses three consecutive words (registers) of %R memory to
store the following:
•
Current value (CV) = word 1.
•
Preset value (PV)
= word 2.
•
Control word
= word 3.
When you enter a UPCTR, you must enter an address for the location of the first of
three consecutive words (registers) directly below the graphic representing the
function (the use of the other two words is implied).
Caution: Do not write to these three words with other instructions. Overlapping these
references will result in erratic operation of the timer.
GFK-0467M
Enable
On each positive transition (off to on) of the enable input, the current count value (CV)
is incremented by one.
PV
Preset Value input. PV is the value copied into the counter’s preset value when the
counter is enabled or reset. The counter will turn on the Q output when it counts up to
the PV value. If the preset value is a constant, it must be a positive number between 0
and 32,767.
Q
Output Q is energized when the current count value (CV) is greater than or equal to the
preset value (PV).
R
Reset Input. When the R input turns on, the current count value (CV) is reset to zero.
Chapter 5 Timers and Counters
5-11
5
Valid Memory Types
Parameter
flow
address
enable
R
•
•
PV
Q
•
•
%I
%Q
%M
%T
%S
%G
%R
%AI %AQ const
none
•
•
•
•
•
•
•
•
•
•
•
•
Valid reference or place where power may flow through the function.
Examples
Basic Counter Circuit
In the following example, the UPCTR will increment its current count value (CV) by one each time
%I0001 transitions from off to on. The PV input sets the preset value to 100 counts. When the
counter counts to 100, coil %Q0001 will be turned on. The counter will continue to count %I0001
transitions beyond its preset value (of 100) until it either reaches its maximum count value (32,
767), or until %I0020 closes and resets the counter. %Q0001 will be on anytime the CV value is
equal to or greater than the PV value.
%Q0001
%I0001
UPCTR
%I0020
R
CONST
+00100
PV
%R0019
Self-Resetting Counter Circuit
In the next example, every time input %I0012 transitions from OFF to ON, the UPCTR counter
counts up by 1. Coil %M0001 is energized whenever 100 %I0012 transitions have been counted.
Once %M0001 turns ON, the accumulated count is reset to zero by the %M0001 contact on the R
input, and %M0001 will turn off.
%M0001
%I0012
UPCTR
%M0001
R
CONST
+00100
PV
%R0019
5-12
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
5
DNCTR
The Down Counter (DNCTR) function is used to count down from a preset value. The minimum
preset value is zero; the maximum present value is +32,767 counts. The minimum current value is
–32,768. When reset, the current value of the counter is set to the preset value PV. When the
enable input transitions from OFF to ON, the current value is decremented by one. The output is
ON whenever the current value is less than or equal to zero.
The current value of the DNCTR is retentive on power failure; no automatic initialization occurs at
power-up.
Enable
DNCTR
Reset
R
Preset
Value
PV
Q
Address of
Three-Word
Block
Parameters
Parameter
Address of
Three-Word
Block
Description
The DNCTR Down Counter uses three consecutive words (registers) of %R memory to
store the following:
•
Current value (CV) = word 1.
•
Preset value (PV)
= word 2.
•
Control word
= word 3.
When you enter a DNCTR, you must enter an address for the location of the first of
three consecutive words (registers) directly below the graphic representing the
function (the use of the other two words is implied).
Caution: Do not write to these three words with other instructions. Overlapping these
references will result in erratic operation of the counter.
GFK-0467M
Enable
On each positive transition (off to on) of the enable input, the current count value (CV)
is decremented by one.
PV
Preset Value input. PV is the value copied into the counter’s preset value (PV) and
current value (CV) registers when the counter is enabled or reset. The counter will turn
on the Q output when it counts down from the current value to zero.
Q
Output Q is energized when the current count value (CV) is less than or equal to zero.
R
Reset Input. When the R input turns on, the current count value (CV) is reset to the
preset value (PV, and output Q is turned off.
Chapter 5 Timers and Counters
5-13
5
Valid Memory Types
Parameter
flow
%I
%Q
%M
%T
%S
%G
address
enable
•
R
•
Q
%AI %AQ
const
none
•
•
•
PV
•
%R
•
•
•
•
•
•
•
•
•
•
Valid reference or place where power may flow through the function.
Examples
In the following example, the down counter identified as COUNTP counts 5000 new parts before
energizing output %Q0005.
|
_____
|NEW_PRT |
|
%Q0005
|——| |—— >DNCTR|———————————————————————————————————————————————————————————( )—
|
|
|
|NXT_BAT |
|
|——| |———|R
|
|
|
|
|
|
|
| CONST —|PV
|
| +05000 |
|
|
|_____|
|
COUNTP
|
5-14
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
5
Inventory Count Examples
In the next example, the PLC is used to keep track of the number of parts contained in a temporary
storage area. There are two ways of accomplishing this function using the Series 90-30/20/Micro
instruction set.
The first method is to use an up/down counter pair with a shared register for the accumulated or
current value. When the parts enter the storage area, the up counter increments by 1 (%I0001
closes), increasing the current value of the parts in storage by a value of 1. When a part leaves the
storage area, the down counter decrements by 1 (%I0002 closes), decreasing the inventory storage
value by 1. To avoid conflict with the shared register, both counters use different register
addresses. When a register counts, its current value is moved to the current value register of the
other counter.
In the following example, %I0001 increments the count, %I0002 decrements the count, %I0009
resets the count to zero, and %I0003, when on, holds the count at its current value regardless of
what %I0001 and %I0002 do. The count value can be read from %R0100.
|
|
_____
|%I0003
|
|
|——| |——+————————————————>UPCTR|
|
|
|
|
|%I0001 |
|
|
+——| |——+
+————————+R
|
|
|
|
|
|%I0009
|
|
|
+——| |——————————+ CONST -+PV
|
|
+00005 |
|
|
+_____+
|
|
%R0100
|
|
_____
|%I0003
|
|
|——| |——+—————————+MOVE_+
|
|
|INT |
|%I0001 |
|
|
+——| |——+ %R0100 -+IN Q|–%R0104
|
| LEN |
|
|00001|
|
|_____|
|
|
_____
|%I0003
|
|
|——| |——+————————————————>DNCTR|
|
|
|
|
|%I0002 |
|
|
+——| |——+
+————————+R
|
|
|
|
|
|%I0009
|
|
|
+——| |——————————+ CONST -+PV
|
|
+00005 |
|
|
+_____+
|
|
%R0104
|
|
_____
|%I0002
|
|
|——| |——+—————————+MOVE_+
|
|
|INT |
|%I0003 |
|
|
+——| |——+ %R0104 -+IN Q|-%R0100
|
| LEN |
|
|00001|
|
|_____|
|
GFK-0467M
Chapter 5 Timers and Counters
5-15
5
A second method to provide storage tracking, shown below, uses ADD and SUB functions that
share a common register, %R00201, on their outputs. When the count increases ($I0004 closes),
the ADD instruction increments the value in %R00201. When the count decreases (%I0005
closes), the SUB instruction decrements the value in %R00201. In this case, transition coils are
used to provide “one-shot” inputs to the ADD and SUB functions. If the enable inputs were not
one-shot types, the ADD and SUB functions would execute once for every scan that they were
enabled. (Transition coils are not needed with UPDTR and DNCTR functions since their enable
inputs have a built-in transition function.) See Chapter 6 for details about the ADD and SUB
functions.
|
|
|%I0004
%M0001
↑)—
+———| |—————————————————————————————————————————————————————————————————————(↑
|
|
|%I0005
%M0002
↑)—
+——| |——————————————————————————————————————————————————————————————————————(↑
|
|
|
_____
|%M0001 |
|
|——| |———| ADD_|—
|
|
|
|
| INT |
|
|
|—
|%R0201 —|I1 Q|—%R00201
|
|
|
|
|
|
| CONST —|I2
|
| +00001 |_____|
|
|
|
|
_____
|%M0002 |
|
|——| |———| SUB_|—
|
|
|
|
| INT |
|
|
|
|%R0201 —|I1 Q|—%R00201
|
|
|
|
|
|
| CONST —|I2
|
| +00001 |_____|
|
5-16
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
Chapter
Math Functions
6
This chapter describes the math functions of the Series 90-30/20/Micro Instruction Set:
†
Abbreviation
Function
ADD
Addition
SUB
Subtraction
MUL
Multiplication
DIV
Description
Add two numbers.
Page
6-2
Subtract one number from another.
6-2
Multiply two numbers.
6-2
Division
Divide one number by another, yielding a
quotient.
6-2
MOD
Modulo Division
Divide one number by another, yielding a
remainder.
6-7
SQRT
Square Root
Find the square root of an integer or real value.
6-9
SIN, COS, TAN,
ASIN, ACOS,
ATAN
Trigonometric Functions †
Perform the appropriate function on the real
value in input IN.
6-11
LOG, LN
EXP, EXPT
Logarithmic/Exponential
Functions †
Perform the appropriate function on the real
value in input IN.
6-13
RAD, DEG
Radian Conversion †
Perform the appropriate function on the real
value in input IN.
6-15
Trigonometric Functions, Logarithmic/Exponential Functions, and Radian Conversion functions
are only available on the model 35x and 36x series CPUs, Release 9.00 or later, and on all releases of
CPU352 and CPU37x.
Note
Division and modulo division are similar functions that differ in their output;
division finds a quotient, while modulo division finds a remainder.
GFK-0467M
6-1
6
Standard Math Functions (ADD, SUB, MUL, DIV)
Math functions include addition, subtraction, multiplication, and division. When a function
receives power flow, the appropriate math function is performed on input parameters I1 and I2.
These parameters must be the same data type. Output Q is the same data type as I1 and I2.
Rules for Math Functions
Sign of Result
Standard math rules for signed number arithmetic apply to determining the
sign of the result.
Addition
The ADD instruction uses the formula I1 + I2 = Q.
Subtraction
The SUB instruction uses the formula I1 – I2 = Q.
Multiplication
The MUL instruction uses the formula I1 x I2 = Q.
Division
The DIV instruction uses the formula I1 ÷ I2 = Q.
For INT and DINT types. DIV rounds down to a whole number quotient
(any remainder is discarded) for the INT or DINT types; it does not round to
the closest integer. For example, 53 divided by 5 = 10 (the remainder of 3 is
discarded).
For REAL type. DIV produces a decimal number result for the Real type
Modulo Division
The MOD instruction can only use types INT and DINT (REAL is not
supported). The MOD instruction uses the formula I1 ÷ I2 = Q. However,
MOD produces only the remainder from the division operation and discards
the quotient. For example, 53 divided by 5 = 3 (the quotient of 10 is
discarded).
Data Types for Math Functions
After you have programmed a math function, you can select the data type. The data type will
appear on the function just below the function’s name (see example in next figure). The three data
types available for math functions are listed in the following table:
Data Type
INT
DINT
REAL*
Description
Signed integer.
Double precision signed integer.
Floating Point
*REAL data type is only available on 35x and 36x series CPUs,
Firmware Release 9.00 or later, and on all releases of CPU352 and
CPU37X.
The default data type is signed integer. For more information on data types, please refer to Chapter
2, Section 2, “Program Organization and User References/Data.”
If the operation of INT or DINT results in overflow, the output reference is set to its largest
possible value for the data type. For signed numbers, the sign is set to show the direction of the
6-2
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
6
overflow. If the operation does not result in overflow (and the inputs are valid numbers), the ok
output is set ON; otherwise, it is set OFF. If signed or double precision integers are used, the sign
of the result depends on the signs of inputs I1 and I2.
ADD
Enable
OK
INT
Input 1
I1
Input 2
I2
Data Type
Q
Output
Parameters
Parameter
Description
enable
When the function is enabled, the operation is performed.
I1
I1 contains a constant or reference for the first value used in the operation.
(I1 is on the left side of the mathematical equation, as in I1 — I2).
I2
I2 contains a constant or reference for the second value used in the operation.
(I2 is on the right side of the mathematical equation, as in I1 — I2).
ok
The ok output is energized when the function is performed without overflow, unless an
invalid operation occurs.
Q
Output Q contains the result of the operation.
Valid Memory Types
Parameter
flow
enable
•
I1
I2
ok
Q
%I
%Q
%M
%T
o
o
o
o
o
o
%S
%G
%R
%AI %AQ const
o
o
•
•
•
•†
o
o
•
•
•
•†
•
none
•
o
o
o
o
o
•
•
•
•
Valid reference or place where power may flow through the function.
o Valid reference for INT data only; not valid for DINT or REAL.
† When using Logicmaster, you will only be able to enter values between –32,768 and +32,767 for double precision signed integer
operations. With VersaPro, you can enter full double precision values.
Note
The default type is INT for 16-bit or single register operands. In Logicmaster,
press F10 to change the Types selection to DINT, 32-bit double word, or REAL
(for the 35x, 36x, and 37x series CPUs only). PLC INT values occupy a single
16-bit register, %R, %AI or %AQ. DINT values require two consecutive
registers with the low 16 bits in the first word and the upper 16 bits with the sign
in second word. REAL values, in the 35x and 36x series CPU (Release 9.00 or
later) and all releases of CPU352 and CPU37x, also occupy a 32-bit double
register with the sign in the high bit followed by the exponent and mantissa.
GFK-0467M
Chapter 6 Math Functions
6-3
6
Math Function Examples
ADD Circuit with a Problem
In the following example, an attempt was made to create a counter circuit that would count the
number of times switch %I0001 closes. The running total is stored in register %R0002. The intent
of this design is that when %I0001 closes, the ADD instruction adds one to the value in %R0002
(the input on I2) and places the new value right back into %R0002 (the output on Q). The problem
with this design is that the ADD instruction will execute once every PLC scan while %I0001 is
closed. So, for example, if %I0001 stays closed for five scans, the output will increment five times,
even though %I0001 only closed once during that period. To correct this problem, the enable
input to the ADD instruction should come from a transition (“one-shot”) coil, as shown in the
second figure below.
%I0001
%Q0001
ADD
INT
%R0002
+00095
I1
CONST
+00001
I2
Q
%R0002
+00095
In the following improved circuit, the %I0001 input switch controls a transition (“one-shot”) coil,
%M0001, whose contact turns on the enable input of the ADD function for only one scan each time
contact %I0001 closes. In order for the %M0001 contact to close again, contact %I0001 has to
open and close again.
Corrected ADD Circuit Design
%M0001
%I0001
%Q0001
%M0001
ADD
INT
6-4
%R0002
+00095
I1
CONST
+00001
I2
Q
%R0002
+00095
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
6
Math Functions and Data Types
Function
ADD INT
Operation
Displays as
Q(16 bit) = I1(16 bit) + I2(16 bit)
5-digit base 10 number with sign
ADD DINT
Q(32 bit) = I1(32 bit) + I2(32 bit)
8-digit base 10 number with sign
ADD REAL*
Q(32 bit) = I1(32 bit) + I2(32 bit)
7-digit base 10 number, sign and decimal
SUB INT
Q(16 bit) = I1(16 bit) – I2(16 bit)
5-digit base 10 number with sign
SUB DINT
Q(32 bit) = I1(32 bit) – I2(32 bit)
8-digit base 10 number with sign
SUB REAL*
Q(32 bit) = I1(32 bit) – I2(32 bit)
7-digit base 10 number, sign and decimal
MUL INT
Q(16 bit) = I1(16 bit) * I2(16 bit)
5-digit base 10 number with sign
MUL DINT
Q(32 bit) = I1(32 bit) * I2(32 bit)
8-digit base 10 number with sign
MUL REAL*
Q(32 bit) = I1(32 bit) * I2(32 bit)
7-digit base 10 number, sign and decimal
DIV INT
Q(16 bit) = I1(16 bit) / I2(16 bit)
5-digit base 10 number with sign
DIV DINT
Q(32 bit) = I1(32 bit) / I2(32 bit)
8-digit base 10 number with sign
DIV REAL*
Q(32 bit) = I1(32 bit) / I2(32 bit)
7-digit base 10 number, sign and decimal
* 35x and 36x series CPUs only, Release 9 or later, and all releases of CPU352 and CPU37x.
Note
The input and output data types must be the same for math functions. The MUL
and DIV functions do not support a mixed mode as the Series 90-70 PLCs do.
For example, the MUL INT of two 16-bit inputs produces a 16-bit product, not a
32-bit product. Using MUL DINT for a 32-bit product requires both inputs to be
32-bit. The DIV INT divides a 16-bit I1 by a 16-bit I2 for a 16-bit result, while
DIV DINT divides a 32-bit I1 by 32-bit I2 for a 32-bit result.
When enabled, these functions pass power if there is no math overflow. If an
overflow occurs, the result is the largest value with the proper sign and no power
flow.
Be careful to avoid overflows when using MUL and DIV functions. If you have to convert INT to
DINT values, remember that the CPU uses standard 2’s complement with the sign extended to the
highest bit of the second (most significant) word. You must check the sign of the low 16-bit word
and extend it into the second 16-bit word. If the most significant bit in a 16-bit INT low word is 0
(indicating positive value), move a 0 to the second word. If the most significant bit in a 16-bit word
is 1 (indicating a negative value), move a –1 or hex 0FFFFh to the second word. Converting from
DINT to INT is easier as the low 16-bit word (first register) is the INT part of a DINT 32-bit word.
The upper 16 bits or second word should be either a 0 (positive) or –1 (negative) value or the DINT
number is too big to convert to 16 bit.
GFK-0467M
Chapter 6 Math Functions
6-5
6
Example
A common application is to scale analog input values with a MUL operation followed by a DIV
and possibly an ADD operation. A 0 to ± 10 volt analog input will place values of 0 to ± 32,000 in
its corresponding %AI input register. Multiplying this input register using an INT MUL function
will result in an overflow since an INT type instruction has an input and output range of 32,767 to
–32,768. Using the %AI value as in input to a MUL DINT will also not work as the 32-bit I1 will
combine 2 analog inputs at the same time. To solve this problem, you can move the analog input to
the low word of a double register, then test the sign and set the second register to 0 if the sign tests
positive or –1 if negative. Then use the double register just created with a MUL DINT which gives
a 32-bit result, and which can be used with a following DINT DIV function.
For example, the following logic could be used to scale a ± 10 volt input %AI1 to ± 25000
engineering units in %R5.
|
_____
_____
_____
|ALW_ON |
|
|
|
|
|
|——] [———| MOVE|—————————————————| MOVE|—————————————————| LT_ | |——————————<+>
|
|
|
|
|
|
| |
|
| INT |
| INT |
| INT | |
|
|
|
|
|
|
| |
|%AI0001–|IN Q|–%R0001
CONST –|IN Q|–%R0002 %R0001 –|I1 Q||
| LEN |
+00000 | LEN |
|
|
|
|00001|
|00001|
|
|
|
|_____|
|_____|
CONST –|I2
|
|
+00000 |_____|
|
|
_____
|
|
|
|<+>—————|MOVE_|–
|
|
|
|
| INT |
|
|
|
| CONST –|IN Q|–%R0002
| –00001 | LEN |
|
|00001|
|
|_____|
|
|
|
_____
_____
|ALW_ON
|
|
|
|
|——] [———————————| MUL_|—————————————————————————————————| DIV_|–
|
|
|
|
|
|
| DINT|
| DINT|
|
|
|
|
|
|
%R0001 –|I1 Q|–%R0003
%R0003 –|I1 Q|–%R0005
|
|
|
|
|
|
CONST –|I2
|
CONST –|I2
|
|
+0000025000 |_____|
+0000032000 |_____|
|
An alternate, but less accurate, way of programming this circuit using INT instructions involves
placing the DIV instruction first, followed by the MUL instruction. The value of I2 for the DIV
instruction would be 32, and the value of I2 for the MUL would be 25. This maintains the scaling
proportion of the above circuit and keeps the values within the working range of the INT type
instructions. However, the DIV instruction inherently discards any remainder value, so when the
DIV output is multiplied by the MUL instruction, the error introduced by a discarded remainder is
multiplied. The percent of error is non-linear over the full range of input values and is greater at
lower input values.
By contrast, in the example above, the results are more accurate because the DIV operation is
performed last, so the discarded remainder is not multiplied. If even greater precision is required,
substitute REAL type math instructions in this example so that the remainder is not discarded.
6-6
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
6
MOD
(INT, DINT)
The Modulo (MOD) function is used to divide one value by another value of the same data type to
obtain the remainder. The sign of the result is always the same as the sign of input parameter I1.
The MOD function operates on these types of data:
Data Type
INT
DINT
Description
Signed integer.
Double precision signed integer.
The default data type is signed integer; however, it can be changed after selecting the function. For
more information on data types, please refer to chapter 2, section 2, “Program Organization and
User References/Data.”
When the function receives power flow, it divides input parameter I1 by input parameter I2. These
parameters must be the same data type. Output Q is calculated using the formula:
Q = I1 - ([I1 DIV I2] * I2)
where DIV produces an integer number. Q is the same data type as input parameters I1 and I2.
OK is always ON when the function receives power flow, unless there is an attempt to divide by
zero. In that case, it is set OFF.
MOD
Enable
OK
INT
Input 1
I1
Input 2
I2
Data Type
Q
Output
Parameters
Parameter
Enable
When the function is enabled, the operation is performed.
I1
I1 contains a constant or reference for the value to be divided by I2.
I2
I2 contains a constant or reference for the value to be divided into I1.
OK
The ok output is energized when the function is performed without overflow.
Q
GFK-0467M
Description
Output Q contains the remainder, if any, that results from dividing I1 by I2. If the value
in I2 is an even multiple of I1, output Q will be zero, indicating no remainder.
Chapter 6 Math Functions
6-7
6
Valid Memory Types
Parameter
flow
enable
•
I1
I2
ok
%Q
%M
%T
o
o
o
o
o
o
%S
%G
%R
%AI %AQ const
o
o
•
•
•
•†
o
o
•
•
•
•†
•
Q
•
o
†
%I
none
•
o
o
o
o
o
•
•
•
Valid reference or place where power may flow through the function.
Valid reference for INT data only; not valid for DINT.
Constants are limited to values between –32,768 and +32,767 for double precision signed integer operations.
Example
In the following example, boxes are being automatically filled with parts. One box holds six parts.
This circuit determines the status of the current box being filled by using modulo division. When
enabled, the MOD function divides the register (PARTS) holding the count of parts produced, by
six. The output (STATUS) of the MOD instruction indicates how many parts (between 1 and 5)
have been loaded into the current box. When the current box is full, the output at Q will equal
zero; if the current box is only partially filled, the output will indicate the number of parts already
in the box. The values in the example show that a total 17 parts have been produced and that the
current box has five parts in it. (The other 12 parts filled two boxes.)
%I0001
MOD
INT
PARTS
+0017
I1
CONST
+0006
I2
Q
STATUS
+0005
To determine the number of boxes filled, you could use the DIV instruction in the following circuit.
%I0001
DIV
INT
PARTS
+0017
I1
CONST
+0006
I2
Q
BOXES
+0002
One possible problem with these circuits is that the register nicknamed PARTS can only hold a
maximum of 32,767 counts. If you need to count higher than that, some additional logic will be
required to (1) reset the PARTS register before it reaches maximum, (2) to capture the number of
boxes filled before you reset the PARTS register, and (3) to reset the PARTS register when the
STATUS register is zero so that its count stays accurate.
6-8
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
6
SQRT
(INT, DINT, REAL)
The Square Root (SQRT) function is used to find the square root of a value. When the function
receives power flow, the value of output Q is set to the integer portion of the square root of the
input IN. The output Q must be the same data type as IN.
The SQRT function operates on these types of data:
Data Type
INT
Description
Signed integer.
DINT
Double precision signed integer.
REAL
Floating Point.
For data types INT and DINT, only the whole number portion of the square root will be output.
The fractional portion will be dropped. For example, the square root of 2 or 3 will be 1, and the
square root of 5, 6, 7, or 8 will be 2.
Note
The REAL data type is only available on 35x and 36x series CPUs, Release 9.00
or later, and on all releases of CPU352 and CPU37x.
The default data type is signed integer; however, it can be changed after selecting the function. For
more information on data types, please refer to chapter 2, section 2, “Program Organization and
User References/Data.”
OK is set ON if the function is performed without overflow. If one of the following invalid
operations occurs, OK is set OFF:
•
IN < 0
•
IN is NaN (Not a Number)
SQRT
Enable
OK
INT
Input
IN
Data Type
Q
Output
Parameters
Parameter
enable
GFK-0467M
Description
When the function is enabled, the operation is performed.
IN
IN contains a constant or reference for the value whose square root is to be
calculated. If IN is less than zero, the function will not pass power flow.
ok
The ok output is energized when the function is performed without overflow, unless an
invalid operation occurs.
Q
Output Q contains the square root of IN. However, for INT and DINT, only the whole
number portion will be kept; any fractional portion will be discarded.
Chapter 6 Math Functions
6-9
6
Valid Memory Types
Parameter
flow
enable
•
IN
ok
o
†
%Q
%M
%T
o
o
o
o
o
o
%S
%G
%R
%AI %AQ const
o
o
•
•
•
o
o
•
•
•
•
Q
•
%I
none
•†
•
Valid reference or place where power may flow through the function.
Valid reference for INT data only; not valid for DINT and REAL.
Constants are limited to values between –32,768 and +32,767 for double precision signed integer operations.
Examples
In the following example, the square root of the integer number located at %R0008 is placed into
the %R0009 register whenever %I0001 is ON.
%I0001
OK
SQRT
INT
%R0008
+00019
Q
IN
%R0009
+00004
As an alternative to the previous example, the same function can be performed with a REAL-type
SQRT instruction, which gives a more precise result as shown in the next figure.
%I0001
OK
SQRT
REAL
%R0008
+19.00000
6-10
IN
Q
%R0009
+4.358899
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
6
Trig Functions
(SIN, COS, TAN, ASIN, ACOS, ATAN)
The SIN, COS, and TAN functions are used to find the trigonometric sine, cosine, and tangent,
respectively, of its input. When one of these functions receives power flow, it computes the sine (or
cosine or tangent) of IN, whose units are radians, and stores the result in output Q. Both IN and Q
are floating-point values.
The ASIN, ACOS, and ATAN functions are used to find the inverse sine, cosine, and tangent,
respectively, of its input. When one of these functions receives power flow, it computes the
designated function on the value at the IN input, and stores the result in output Q, whose units are
radians. Both IN and Q are floating-point values.
The SIN, COS, and TAN functions accept a broad range of input values, where
–263 < IN <+263, (263 ≈ 9.22x1018).
The ASIN and ACOS functions accept a narrow range of input values, where – 1 ≤ IN ≤ 1. Given a
valid value for the IN parameter, the ASIN_REAL function will produce a result Q such that:
π
≤ Q ≤
2
ASIN (IN) =
π
2
The ACOS_REAL function will produce a result Q such that:
ACOS (IN)
0 ≤ Q ≤ π
=
The ATAN function accepts the broadest range of input values, where – ∞ ≤ IN ≤ + ∞. Given a
valid value for the IN parameter, the ATAN_REAL function will produce a result Q such that:
π
≤ Q ≤
2
ATAN (IN) =
π
2
_____
|
|
(enable) —| SIN_|— (ok)
|
|
| REAL|
|
|
(input parameter IN) —|IN Q|— (output parameter Q)
|_____|
Note
The TRIG functions are only available on the 35x and 36x series CPUs, Release
9 or later, and on all releases of CPU352 and CPU37x.
GFK-0467M
Chapter 6 Math Functions
6-11
6
Parameters
Parameter
Description
enable
When the function is enabled, the operation is performed.
IN
IN contains the constant or reference real value to be operated on.
ok
The ok output is energized when the function is performed without overflow,
unless an invalid operation occurs and/or IN is NaN.
Q
Output Q contains the trigonometric value of IN.
Valid Memory Types
Parameter
flow
enable
IN
•
ok
•
%I
%Q
%M
%T
%S
%G
•
Q
•
%R
%AI
%AQ
•
•
const
none
•
•
•
•
•
Valid reference or place where power may flow through the function.
Example
In the following example, the COS of the value in %R0001 is placed in %R0033.
|
_____
|ALW_ON
|
|
|——] [—————————| COS_|—
|
|
|
|
| REAL|
|
|
|
|
%R0001—|IN Q|—%R0033
|
|
|
|
+3.141500|_____| -1.000000
|
6-12
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
6
Logarithmic/Exponential Functions (LOG, LN, EXP, EXPT)
The LOG, LN, and EXP functions have two input parameters and two output parameters. When the
function receives power flow, it performs the appropriate logarithmic/exponential operation on the
real value in input IN and places the result in output Q.
•
For the LOG function, the base 10 logarithm of IN is placed in Q.
•
For the LN function, the natural logarithm of IN is placed in Q.
•
For the EXP function, e is raised to the power specified by IN and the result is placed in Q.
(NOTE: e is a constant used in logarithmic calculations. It has an approximate value of
2.71828.)
•
For the EXPT function, the value of input I1 is raised to the power specified by the value I2
and the result is placed in output Q. (The EXPT function has three input parameters and two
output parameters.)
The ok output will receive power flow, unless IN is NaN (Not a Number) or is negative.
_____
|
|
(enable) —| LOG_|— (ok)
|
|
| REAL|
|
|
|
|
(input parameter IN) —|IN Q|— (output parameter Q)
|_____|
Parameters
Parameter
enable
Description
When the function is enabled, the operation is performed.
IN
IN contains the real value to be operated on.
ok
The ok output is energized when the function is performed without overflow,
unless an invalid operation occurs and/or IN is NaN or is negative.
Q
Output Q contains the logarithmic/exponential value of IN.
Note
The LOG, LN, EXP and EXPT functions are only available on the 35x and 36x
series CPUs, Release 9 or later, and on all releases of CPU352 and CPU37x.
Note
When the input value, IN, for the EXP function is negative infinity (-∞), the
function returns a value of 0, as expected. In this case, for the CPU352, the
function does not pass power. For all other 90-30 CPUs, the function does pass
power, even though the output is 0. (A value of -∞ results from dividing a
negative value by zero. It will appear on a Logicmaster screen as
−OVERFLOW.)
GFK-0467M
Chapter 6 Math Functions
6-13
6
Valid Memory Types
Parameter
flow
enable
•
IN*
ok
•
%I
%Q
%M
%T
%S
%G
%R
%AI
%AQ
const
•
•
•
•
•
•
•
•
•
•
•
•
•
Q
I1*
I2*
*
•
none
•
•
•
For the EXPT function, input IN is replaced by input parameters I1 and I2.
Valid reference or place where power may flow through the function.
Example
In the following example, the value of %AI0001, +3.000000, is raised to the power of +2.500000,
and the result, +15.58846, is placed in %R0001.
|
_____
|ALW_ON
|
|
|——] [—————————|EXPT_|—
|
|
|
|
| REAL|
|
|
|
|
|
|
|
%AI0001—|I1 Q|—%R0001
|
+3.000000 |
| +15.58846
|
|
|
|
|
|
|
CONST —|I2
|
|
+2.500000 |_____|
|
6-14
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
6
Radian Conversion
(RAD, DEG)
When the function receives power flow, the appropriate conversion (RAD_TO_DEG or
DEG_TO_RAD, i.e., Radian to Degree or vice versa) is performed on the real value in input IN and
the result is placed in output Q.
The ok output will receive power flow unless IN is NaN (Not a Number).
_____
|
|
(enable) —| RAD_|— (ok)
|
|
| TO_ |
|
|
| DEG |
|
|
(input parameter IN) —|IN Q|— (output parameter Q)
|_____|
Parameters
Parameter
Description
enable
When the function is enabled, the operation is performed.
IN
IN contains the real value to be operated on.
ok
The ok output is energized when the function is performed without overflow, unless
IN is NaN.
Q
Output Q contains the converted value of IN.
Note
The Radian conversion functions are only available on the 35x and 36x series
CPUs, Release 9 or later, or on all releases of CPU352 and CPU37x.
Valid Memory Types
Parameter
flow
enable
•
IN
ok
•
%I
%Q
%M
%T
%S
%G
Q
•
GFK-0467M
%R
%AI
%AQ
const
•
•
•
•
•
•
•
none
•
Valid reference or place where power may flow through the function.
Chapter 6 Math Functions
6-15
6
Example
In the following example, +1500 is converted to DEG and is placed in %R0001.
|
_____
|ALW_ON
|
|
|——] [———————————————————————————| RAD_|
|
|
|
|
| TO_|
|
|
|
|
| DEG |
|
CONST
|
|
|
+1500.000 —|IN Q|— %R0001
|
|_____| 85943.66
6-16
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
Chapter
Relational Functions
7
Relational functions are used to determine the relationship of two values. This chapter describes the
following relational functions:
Abbreviation
GFK-0467M
Function
Description
Page
EQ
Equal
NE
Not Equal
Test two numbers for equality.
7-2
Test two numbers for non-equality.
7-2
GT
Greater Than
Test for one number greater than another.
7-2
GE
Greater Than
or Equal
Test for one number greater than or equal to another.
7-2
LT
Less Than
Test for one number less than another.
7-2
LE
Less Than
or Equal
Test for one number less than or equal to another.
7-2
RANGE
Range
Determine whether a number is within a specified range
(available for Release 4.5 or higher CPUs).
7-4
7-1
7
Standard Relational Functions (EQ, NE, GT, GE, LT, LE)
When the function receives power flow, it compares input parameter I1 to input parameter I2,
which must be of the same data type. Relational functions operate on these types of data:
Data Type
INT
Description
Signed integer.
DINT
Double precision signed integer.
REAL
Floating Point (not available for the
RANGE function)
Note
The REAL data type is only available on the 35x and 36x series CPUs, Release 9
or later, and on all releases of CPU352 and CPU37x. The %S0020 system bit is
set ON when a relational function using REAL data executes successfully. It is
cleared when either input is NaN (Not a Number). The Range function block
does not accept REAL type.
The default data type is signed integer. To compare either signed integers, double precision signed
integers, or real numbers select the new data type after selecting the relational function. To
compare data of other types or of two different types, first use the appropriate conversion function
(described in chapter 11, “Conversion Functions”) to change the data to one of the supported types.
If input parameters I1 and I2 match the specified relationship, output Q receives power flow and is
set ON (1); otherwise, it is set OFF (0).
_____
|
|
(enable) —| EQ_ |
|
|
| INT |
|
|
(input parameter I1) —|I1 Q|— (output parameter Q)
|
|
|
|
(input parameter I2) —|I2
|
|_____|
Parameters
Parameter
enable
Description
When the function is enabled, the operation is performed.
I1
I1 contains a constant or reference for the first value to be compared.
(I1 is on the left side of the relational equation, as in I1 < I2).
I2
I2 contains a constant or reference for the second value to be compared.
(I2 is on the right side of the relational equation, as in I1 < I2).
Q
Output Q is energized when I1 and I2 match the specified relation.
Note
I1 and I2 must be valid numbers, i.e., cannot be NaN (Not a Number).
7-2
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
7
Expanded Description
Function
Description
Equal
When enabled, if the value at input I1 is equal to the value at input I2, output Q is
energized.
Not Equal
When enabled, if the value at input I1 is NOT equal to the value at input I2, output Q is
energized.
Greater Than
When enabled, if the value at input I1 is greater than the value at input I2, output Q is
energized.
Greater Than
or Equal
When enabled, if the value at input I1 is greater than or equal to the value at input I2,
output Q is energized.
Less Than
When enabled, if the value at input I1 is less than the value at input I2, output Q is
energized.
Less Than
or Equal
When enabled, if the value at input I1 is less than or equal to the value at input I2, output
Q is energized.
Valid Memory Types
Parameter
flow
%I
%Q
%M
%T
enable
•
I1
o
o
o
I2
o
o
o
Q
•
%S
%G
%R
%AI %AQ
const
o
o
•
•
•
•†
o
o
•
•
•
•†
none
•
• Valid reference or place where power may flow through the function.
o Valid reference for INT data only; not valid for DINT or REAL.
† Constants are limited to integer values (+32,767 to –32,768) for double precision signed integer operations when programmed
with Logicmaster PLC software. When programmed with VersaPro software, full double precision signed integer values are
allowed.
Example
In the following example, two double precision signed integers, %R00100/101 and %R00102/103,
are compared whenever enable contact %I0001 is on. If the value at input I1 is less than or equal to
the value at input I2, coil %Q00002 will be turned on. In the following example, coil %Q00002 is
turned off, since I1 is greater than I2.
|
_____
|%I0001
|
|
|——| |——————————| LE_ |
|
|
|
|
| DINT|
|
%R00100 |
|
%Q00002
|
+0000134689—|I1 Q|————————————————————————————————————————————————————( )—
|
|
|
|
%R00102 |
|
|
+0000134600—|I2
|
|
|_____|
|
GFK-0467M
Chapter 7 Relational Functions
7-3
7
RANGE
(INT, DINT, WORD)
The RANGE function is used to determine if a value is between the range of two numbers.
Note
This function is available only to Release 4.41 or later CPUs.
The RANGE function operates on these types of data (REAL type is not supported in the RANGE
function):
Data Type
INT
DINT
WORD
Description
Signed integer.
Double precision signed integer.
Word data type.
The default data type is signed integer; however, it can be changed after selecting the function. For
more information on data types, please refer to chapter 2, section 2, “Program Organization and
User References/Data.”
When the function is enabled, the RANGE function block will compare the value in input
parameter IN against the range specified by limit parameters L1 and L2. When the value is within
the range specified by L1 and L2, inclusive, output parameter Q is set ON (1). Otherwise, Q is set
OFF (0).
(enable)
(limit parameter L1)
(limit parameter L2)
(value to be compared)
_____
|
|
–|RANGE|
|
|
| INT |
|
|
–|L1 Q|– (output parameter Q)
|
|
–|L2
|
|
|
–|IN
|
|_____|
Note
Limit parameters L1 and L2 represent the end points of a range. There is no
minimum/maximum or high/low connotation assigned to either parameter. Thus,
a desired range of 0 to 100 could be specified by assigning 0 to L1 and 100 to L2
or 0 to L2 and 100 to L1.
7-4
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
7
Parameters
Parameter
Description
enable
When the function is enabled, the operation is performed.
L1
L1 contains the start point of the range.
L2
L2 contains the end point of the range.
IN
IN contains the value to be compared against the range specified by L1 and L2.
Q
Output Q is energized when the value in IN is within the range specified by L1 and L2,
inclusive.
Valid Memory Types
Parameter
flow
%I
%Q
%M
%T
enable
•
L1
o
o
o
L2
o
o
o
IN
o
o
o
Q
•
o
‡
%S
%G
%R
%AI %AQ const
o
o
•
•
•
•‡
o
o
•
•
•
•‡
o
o
•
•
•
none
•
•
Valid reference or place where power may flow through the function.
Valid reference for INT or WORD data only; not valid for DINT.
Constants are limited to integer values for double precision signed integer operations.
Example 1
In the following example, %AI0001 is checked to be within a range specified by two constants, 0
and 100.
|
_____
|%I0001 |
|
|——| |———+RANGE|
|
| INT |
|
|
|
%Q0002
|
100 —+L1 Q+—————————————————————————————————————————————————————————( )—
|
|
|
|
0 —+L2
|
|
|
|
|%AI0001—+IN
|
|
|_____|
|
RANGE Truth Table for Example 1
GFK-0467M
Enable State
%I0001
L1 Value
Constant
L2 Value
Constant
IN Value
%AI0001
Q State
%Q0001
ON
100
0
<0
OFF
ON
100
0
0 — 100
ON
ON
100
0
> 100
OFF
OFF
100
0
Any value
OFF
Chapter 7 Relational Functions
7-5
7
Example 2
In this example, %AI0001 is checked to be within a range specified by two register values.
|
_____
|%I0001 |
|
|——| |———+RANGE|
|
| INT |
|
|
|
%Q0002
|%R0001 —+L1 Q|—————————————————————————————————————————————————————————( )—
|
|
|
|%R0002 —+L2
|
|
|
|
|%AI0001—+IN
|
|
|_____|
|
RANGE Truth Table for Example 2
7-6
Enable State
%I0001
L1 Value
%R0001
L2 Value
%R0002
IN Value
%AI0001
Q State
%Q0001
ON
500
0
<0
OFF
ON
500
0
0 — 500
ON
ON
500
0
> 500
OFF
OFF
500
0
Any value
OFF
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
Chapter
Bit Operation Functions
8
Bit operation functions perform comparison, logical, and move operations on bit strings. The
AND, OR, XOR, and NOT functions are limited to operating on a single word. The remaining bit
operation functions may operate on multiple words, with a maximum string length of 256 words.
All bit operation functions require the WORD data type.
Although data must be specified in 16-bit increments, these functions operate on data as a
continuous string of bits, with bit 1 of the first word being the Least Significant Bit (LSB). The last
bit of the last word is the Most Significant Bit (MSB). For example, if you specified three words of
data beginning at reference %R0100, it would be operated on as 48 contiguous bits.
%R0100 16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
%R0101 32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
%R0102 48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
← bit 1 (LSB)
↑
(MSB)
Note
Overlapping input and output reference address ranges in multi-word functions
may produce unexpected results.
GFK-0467M
8-1
8
The following bit operation functions are described in this chapter:
Abbreviation
Function
AND
Logical AND
If a bit in bit string I1 and the corresponding bit
in bit string I2 are both 1, place a 1 in the
corresponding location in output string Q.
8-3
OR
Logical OR
If a bit in bit string I1 and/or the corresponding
bit in bit string I2 are both 1, place a 1 in the
corresponding location in output string Q.
8-3
XOR
Logical exclusive
OR
If a bit in bit string I1 and the corresponding bit
in string I2 are different, place a 1 in the
corresponding location in the output bit string.
8-5
NOT
Logical invert
Set the state of each bit in output bit string Q to the
opposite state of the corresponding bit in bit string I1.
8-7
SHL
Shift Left
Shift all the bits in a word or string of words to the left
by a specified number of places.
8-8
SHR
Shift Right
Shift all the bits in a word or string of words to the right
by a specified number of places.
8-8
ROL
Rotate Left
8-10
ROR
Rotate Right
BTST
Bit Test
BSET
Bit Set
Rotate all the bits in a string a specified number of
places to the left.
Rotate all the bits in a string a specified number of
places to the right.
Test a bit within a bit string to determine whether that
bit is currently 1 or 0.
Set a bit in a bit string to 1.
BCLR
Bit Clear
BPOS
Bit Position
MSKCMP
8-2
Masked Compare
Description
Page
8-57
8-12
8-14
Clear a bit within a string by setting that bit to 0.
8-14
Locate a bit set to 1 in a bit string.
8-16
Compare the contents of two separate bit strings with
the ability to mask selected bits (available for Release
4.5 or higher CPUs).
8-18
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
8
AND and OR (WORD)
For each scan that it is enabled, an AND or OR function compares the state of each bit in bit string
I1 with the corresponding bit in bit string I2, beginning at the least significant bit in each.
For each two bits compared for the AND function, if both are 1, then a 1 is placed in the
corresponding location in output string Q. If either or both bits are 0, then a 0 is placed in string Q
in that location.
The AND function is useful for building masks or screens, where only certain bits are passed
through (those that are opposite a 1 in the mask), and all other bits are set to 0. The function can
also be used to clear the selected area of word memory by ANDing the bits with another bit string
known to contain all 0s. The I1 and I2 bit strings specified may overlap.
For each two bits examined for the OR function, if either or both bits are 1, then a 1 is placed in the
corresponding location in output string Q. If both bits are 0, then a 0 is placed in string Q in that
location.
The OR function is useful for combining strings, and to control many outputs through the use of
one simple function block. The function is the equivalent of two relay contacts in parallel for each
bit position in the string. It can be used to drive indicator lamps directly from input states, or
superimpose blinking conditions on status lights.
The function passes power flow to the right whenever power is received.
_____
|
|
(enable) —| AND_|— (ok)
|
|
| WORD|
|
|
(input parameter I1) —|I1 Q|— (output parameter Q)
|
|
|
|
|
|
(input parameter I2) —|I2
|
|_____|
Parameters
Parameter
enable
GFK-0467M
Description
When the function is enabled, the operation is performed.
I1
I1 contains a constant or reference for the first word of the first string.
I2
I2 contains a constant or reference for the first word of the second string.
ok
The ok output is energized whenever enable is energized.
Q
Output Q contains the result of the operation.
Chapter 8 Bit Operation Functions
8-3
8
Valid Memory Types
Parameter
flow
%I
%Q
%M
%T
%S
%G
%R
enable
•
I1
•
•
•
•
•
•
•
•
•
•
I2
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•†
•
•
•
•
ok
Q
•
†
%AI %AQ const
•
none
•
Valid reference or place where power may flow through the function.
%SA, %SB, or %SC only; %S cannot be used.
Example
In the following example, whenever input %I0001 is set, the 16-bit strings represented by
nicknames WORD1 and WORD2 are examined. The results of the Logical AND are placed in
output string RESULT.
|
_____
|%I0001 |
|
|——| |———| AND_|—
|
| WORD|
|
|
|
| WORD1 —|I1 Q|—RESULT
|
|
|
|
|
|
|
|
|
|
|
|
| WORD2 —|I2
|
|
|_____|
|
8-4
WORD1 (I1) 0
0
0
1
1
1
1
1
1
1
0
0
1
0
0
0
WORD2 (I2) 1
1
0
1
1
1
0
0
0
0
0
0
1
1
1
1
RESULT (Q) 0
0
0
1
1
1
0
0
0
0
0
0
1
0
0
0
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
8
XOR (WORD)
The Exclusive OR (XOR) function is used to compare each bit in the bit string at input I1 with the
corresponding bit in the bit string at input I2. If the corresponding bits are different, a 1 is placed in
the corresponding position in the output bit string.
The XOR function is useful for comparing two bit strings, or to flash a group of bits on and off at
the rate of one ON state per two scans.
For each scan that the XOR is enabled, it compares each bit in string I1 with the corresponding bit
in string I2, beginning at the least significant bit in each string. In a comparison, if only one is a
logic 1, then a 1 is placed in the corresponding location in bit string Q. The XOR function passes
power flow to the right whenever power is received.
If string I2 and output string Q begin at the same reference, a 1 placed in string I1 will cause the
corresponding bit in string I2 to alternate between 0 and 1, changing state with each scan as long as
power is received. Longer cycles can be programmed by switching the enable input to the function
at twice the desired rate of flashing; for this application, the enable input should go high for one
scan long (use a contact from a one-shot type coil or self-resetting timer circuit).
_____
|
|
(enable) —| XOR_|— (ok)
|
|
| WORD|
|
|
(input parameter I1) —|I1 Q|— (output parameter Q)
|
|
|
|
|
|
|
|
(input parameter I2) —|I2
|
|_____|
Parameters
Parameter
enable
GFK-0467M
Description
When the function is enabled, the operation is performed.
I1
I1 contains a constant or reference for the first word to be XORed.
I2
I2 contains a constant or reference for the second word to be XORed.
ok
The ok output is energized whenever enable is energized.
Q
Output Q contains the result of I1 XORed with I2.
Chapter 8 Bit Operation Functions
8-5
8
Valid Memory Types
Parameter
flow
%I
%Q
%M
%T
%S
%G
%R
enable
•
I1
•
•
•
•
•
•
•
•
•
•
I2
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•†
•
•
•
•
ok
•
Q
•
†
%AI %AQ const
none
•
Valid reference or place where power may flow through the function.
%SA, %SB, or %SC only; %S cannot be used.
Example of an Alarm Circuit Using an XOR
In the following example, whenever enable contact %M0001 is on, the 16-bit string nicknamed
SWITCH is compared to a reference bit string, nicknamed REFER. The SWITCH bit string is a
group of bits that represent the on/off status of alarm switch contacts. The REFER bit string
represents the normal or non-alarm status of these bits. If the state of any SWITCH bit is different
from its corresponding REFER bit, their corresponding output at Q goes to logic 1. Under normal
(no alarm) conditions, the value of the word nicknamed STATUS will be zero.
|%M0001 |
|
|——| |———| XOR_|
|
| WORD|
|
|
|
| SWITCH—|I1 Q|—STATUS
|
|
|
|
|
|
|
|
|
|
|
|
| REFER —|I2
|
|
|_____|
|
Bit Position
16 15 14 13 12 11 10
9
8
7
6
5
4
I1 (SWITCH)
0
1
0
1
1
1
1
0
1
1
0
0
0
I2 (REFER)
0
0
0
1
1
1
1
1
1
1
0
0
Q (STATUS)
0
1
0
0
0
0
0
1
0
0
0
0
3
2
1
0
0
0
1
0
0
0
1
0
0
0
The data in STATUS could be used as an input to a Not Equal (NE) function, which would
compare the word nicknamed STATUS to a constant of zero. If STATUS does not equal zero, the
NE turns on its output, indicating the presence of an alarm.
The bits in STATUS that are equal to logic 1 can be identified with the BPOS (Bit Position)
function, which would search the bits in STATUS and report the position (a number between 1 and
16) of the first bit (starting at bit 1) it encounters that is at logic 1. In the example above, the BPOS
would output the number 4, indicating the fourth bit is a logic 1. To test for more than one bit, you
could store a record of bit 4, use a BCLR (Bit Clear) function to clear bit 4, then repeat the BPOS
test to find the next bit that is equal to logic 1 (bit 9 in the example above). This process can be
repeated until no more non-zero bits are found. Note that the BCLR and BPOS functions are
discussed in detail elsewhere in this chapter.
8-6
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
8
NOT (WORD)
The NOT function is used to set the state of each bit in the output bit string Q to the opposite of the
state of the corresponding bit in bit string I1.
The NOT function executes and passes power flow for each scan that it’s enable input is on.
_____
|
|
(enable) —| NOT_|— (ok)
|
|
| WORD|
|
|
(input parameter I1) —|I1 Q|— (output parameter Q)
|
|
|
|
|
|
|_____|
Parameters
Parameter
Description
enable
When the function is enabled, the operation is performed.
I1
I1 contains the constant or reference for the word to be negated.
ok
The ok output is energized whenever enable is energized.
Q
Output Q contains the NOT (negation) of I1.
Valid Memory Types
Parameter
flow
enable
•
%I
%Q
%M
%T
%S
%G
%R
•
•
•
•
•
•
•
I1
ok
•
•
none
•
•
•
Q
•
%AI %AQ const
•
•
•
•
•†
•
Valid reference or place where power may flow through the function. †
•
•
•
%SA, %SB, or %SC only; %S cannot be used.
Example
In the following example, whenever input %I0001 is set, the bit string represented by the nickname
NOTCAT is set to the inverse of bit string CAT, as seen in the truth table below.
|
_____
|%I0001 |
|
|——| |———| NOT_|—
|
| WORD|
|
|
|
|
CAT —|I1 Q|—NOTCAT
|
|
|
|
|
|
|
|
|
|
|_____|
|
CAT
NOTCAT
GFK-0467M
1
0
1
0
0
1
1
0
Chapter 8 Bit Operation Functions
0
1
1
0
0
1
0
1
1
0
1
0
0
1
1
0
0
1
0
1
0
1
1
0
8-7
8
SHL and SHR (WORD)
The Shift Left (SHL) function is used to shift all the bits in a word or group of words to the left by
a specified number of places. When the shift occurs, the specified number of bits is shifted out of
the output string to the left. As bits are shifted out of the high end of the string, the same number of
bits is shifted in at the low end.
MSB
B2 ← 1
1
LSB
0
1
1
1
1
1
1
1
0
0
1
0
0
0 ←B1
The Shift Right (SHR) function is used to shift all the bits in a word or group of words a specified
number of places to the right. When the shift occurs, the specified number of bits is shifted out of
the output string to the right. As bits are shifted out of the low end of the string, the same number
of bits is shifted in at the high end.
MSB
B1 → 1
1
LSB
0
1
1
1
1
1
1
1
0
0
1
0
0
0 →B2
A string length of 1 to 256 words can be selected for either function.
If the number of bits to be shifted (N) is greater than the number of bits in the array (LEN) * 16, or
if the number of bits to be shifted is zero, then the array (Q) is filled with copies of the input bit
(B1), and the input bit is copied to the B2 output. If the number of bits to be shifted is zero, then no
shifting is performed; the input array is copied into the output array; and input bit B1 is copied to
the B2 output.
The bits being shifted into the beginning of the string are specified via input parameter B1, which
requires a contact to the power rail. If a length greater than 1 has been specified as the number of
bits to be shifted, each of the bits is filled with the same value (0 or 1) of B1. The B1 input can be
controlled by
•
An ALW_ON (%S07) contact, which holds B1 permanently at logic 1.
•
An ALW_OFF (%S06) contact, which holds B1 permanently at logic 0.
•
A contact from an internal coil such as %M or %Q that lets you change the value.
• A %I contact that lets you change the value from an input contact.
The SHL or SHR function passes power flow to the right, unless the number of bits specified to be
shifted is zero.
Output Q is the shifted copy of the input string. If you want the input string to be shifted, the
output parameter Q must use the same memory location as the input parameter IN. The SHL/SHR
instructions execute each scan that their enable input is on. Output B2 holds the value of the last
bit shifted out; for example, if four bits were shifted, B2 would contain be the value (either 1 or 0)
of the fourth bit shifted out.
_____
|
|
(enable) —| SHL_|
|
|
| WORD|
|
|
(words to be shifted) |IN B2|— (last bit shifted out)
| LEN |
|00001|
|
|
|
|
(number of bits) —|N
Q|— (output parameter Q)
|
|
(bit shifted in) —|B1
|
|_____|
8-8
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
8
Parameters
Parameter
Description
enable
IN
N
B1
B2
Q
LEN
When enable is logic 1, the shift is performed.
IN contains the address of the first word to be shifted.
N contains the number of places (bit positions) that the array is to be shifted.
B1 contains the bit value (0 or 1) to be shifted into the array.
B2 contains the bit value (0 or 1) of the last bit shifted out of the array.
Output Q contains the first word of the shifted array.
LEN is the number of words (1 – 256) in the array to be shifted.
Valid Memory Types
Parameter
flow
enable
IN
N
B1
B2
Q
•
•
†
%I
%Q
%M
%T
%S
%G
%R
•
•
•
•
•
•
•
•
•
•
•
•
•
%AI %AQ const
•
•
•
•
none
•
•
•
•
•
•
•
•
•†
•
•
•
•
Valid reference or place where power may flow through the function.
%SA, %SB, or %SC only; %S cannot be used.
Example
In the following example, when input %M0001 is on, the SHL makes a copy of the bit string at IN
(nicknamed WORD1). Then, in the copy, it shifts all bits to the left by 8 bit positions (specified by
the value at N). The bits from bit positions 9-16 are shifted out (discarded), and the bits that were
in positions 1-8 now occupy bit positions 9-16. Bit positions 1-8, which were “vacated” when bits
1-8 were shifted, are filled with ones because, for this example, contact %M0002 is closed, making
the B1 input equal to logic 1. Finally, the shifted/filled word is written to the address at output Q
(nicknamed WORD2). The original WORD1 at IN is not changed. Output B2 equals zero since
the last bit shifted out was logic zero (the bit that occupied bit position 9), and coil %M0003 is on
because the function worked correctly and therefore produced power flow at its OK output.
%M0003
%M0001
SHL_
WORD
WORD1
LENGTH
+00008
%M0002
IN
B2
OK
OUTBIT
LEN
00001
N
Q
Bit Pos. 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
WORD2
B1
GFK-0467M
Chapter 8 Bit Operation Functions
WORD1 0 0 0 0 0 0 0 0 0 1 0 1 0 1 0 1
WORD2 0 1 0 1 0 1 0 1 1 1 1 1 1 1 1 1
8-9
8
ROL and ROR (WORD)
The Rotate Left (ROL) function rotates all the bits in a string a specified number of places to the
left. When rotation occurs, the specified number of bits is rotated out of the input string to the left
and back into the string on the right.
The Rotate Right (ROR) function rotates all bits in a string a specified number of places to the
right. When rotation occurs, the specified number of bits is rotated out of the input string to the
right and back into the string on the left.
A string length of 1 to 256 words can be selected for either function.
The number of places specified for rotation at input N must be more than zero and less than the
number of bits in the string. Otherwise, no movement occurs and no power flow is generated.
The rotation result is placed in output string Q. If you want the input string to be rotated, the output
parameter Q must use the same memory location as the input parameter IN. The rotate function
executes each scan that the enable input is on.
_____
|
|
(enable) —| ROL_|— (ok)
|
|
| WORD|
|
|
(word to be rotated) —|IN Q|— (output parameter Q)
|
|
| LEN |
|00001|
|
|
(number of bits) —|N
|
|_____|
Parameters
Parameter
enable
When the enable input is on, the rotation is performed.
IN
IN contains the address of the first word to be rotated.
N
N contains the number of places (bit positions) that the array is to be rotated.
ok
The ok output is energized when the rotation function is enabled and the rotation length
(at N) is greater than zero but is not greater than the array size.
Q
Output Q contains the first word of the rotated array.
LEN
8-10
Description
LEN is the number of words (1 – 256) in the array to be rotated.
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
8
Valid Memory Types
Parameter
flow
%I
%Q
%M
%T
%S
%G
%R
enable
•
IN
•
•
•
•
•
•
•
•
•
N
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
ok
•
none
•
•
Q
•
†
%AI %AQ const
•†
Valid reference or place where power may flow through the function.
%SA, %SB, or %SC only; %S cannot be used.
Example
In the following example, whenever enable input %I0001 is on, the ROL makes a copy of the input
string at IN. Then, in the copy, it rotates the input bit string 3 bits (specified by the value of input
N) and places the result in %R0002. After execution of this function, the input bit string %R0001
is unchanged. However, if you wish to rotate the input string, use the same reference address for
IN and Q.
|
_____
|%I0001 |
|
|——| |———| ROL_|—
|
| WORD|
|
|
|
| %R0001—|IN Q|—%R0002
|
|
|
|
| LEN |
|
|00001|
|
|
|
| CONST —|N
|
| +00003 |_____|
|
%R0001:
MSB
1
1
LSB
1
1
1
0
0
0
0
0
0
0
0
0
0
←
0 ←
%R0002 (after rotation occurs):
MSB
1
GFK-0467M
1
LSB
0
0
0
Chapter 8 Bit Operation Functions
0
0
0
0
0
0
0
0
1
1
1
8-11
8
BTST (WORD)
The Bit Test (BTST) function is used to test a bit within a bit string to determine whether that bit is
currently 1 or 0. The result of the test is placed in output Q.
Each sweep power is received, the BTST function sets its output Q to the same state as the
specified bit. If a register rather than a constant is used to specify the bit number, the same function
block can test different bits on successive sweeps. If the value of BIT is outside the range specified
by the following formula, then Q is set OFF.
Formula: 1 ≤ BIT ≤ (16 * LEN)
A string length of 1 to 256 words can be selected.
_____
|
|
(enable) —| BIT_|
|
|
|TEST_|
| WORD|
|
|
(first word to be tested) —|IN Q|— (output parameter Q)
| LEN |
|00001|
|
|
(bit number of IN) —|BIT |
|_____|
Parameters
Parameter
Description
enable
When the function is enabled, the bit test is performed.
IN
IN contains the first word of the data to be operated on.
BIT
BIT contains the bit number of IN that should be tested. Valid range is (1 ≤ BIT ≤ (16 *
LEN) ).
Q
LEN
Output Q is energized if the bit tested was a 1.
LEN is the number of words in the string to be tested.
Note
When using the Bit Test, Bit Set, Bit Clear or Bit Position function, the bits
are numbered 1 through 16, NOT 0 through 15.
8-12
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
8
Valid Memory Types
Parameter
flow
%I
%Q
%M
%T
%S
%G
%R
enable
•
IN
•
•
•
•
•
•
•
•
•
BIT
•
•
•
•
•
•
•
•
Q
•
%AI %AQ const
none
•
•
•
Valid reference or place where power may flow through the function.
Example
In the following example, whenever enable input %M0001 is on, bit 14 in word %R0001 is tested
(bit 14 is specified by the value in %R0002). Since bit 14 is zero in the value shown for %R0001
(5C7C), output Q does not turn on. Note that this function can only be a WORD type; therefore,
any memory address used at IN will appear on a Logicmaster screen in hexadecimal format.
However, the value at BIT will appear in integer format regardless of whether a constant or
memory address is used.
%M0001
%R0001
5C7C
%R0002
+00014
GFK-0467M
BIT_
TEST_
WORD
IN
Q
LEN
00001
BIT
Chapter 8 Bit Operation Functions
%M0003
Bit Number
16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
%R0001
0 1 0 1 1 1 0 0 0 1 1 1 1 1 0 0
8-13
8
BSET and BCLR (WORD)
The Bit Set (BSET) function is used to set a bit in a bit string to 1. The Bit Clear (BCLR) function
is used to clear a bit within a string by setting that bit to 0.
Each sweep that power is received, the function sets the specified bit to 1 for the BSET function or
to 0 for the BCLR function. If a variable (register) rather than a constant is used to specify the bit
number, the same function block can set different bits on successive sweeps.
A string length of 1 to 256 words can be selected. The function passes power flow to the right,
unless the value for BIT is outside the range (1 ≤ BIT ≤ (16 * LEN) ). Then, ok is set OFF. For
example, if LEN is set to 1, then the length of the bit string to be tested is 16. If, in this case, the
number at BIT was 17 or higher, it would be out of range, so the ok output would not come on.
_____
|
|
(enable) —| BIT_|— (ok)
|
|
| SET_|
| WORD|
|
|
(first word) —|IN
|
|
|
| LEN |
|00001|
|
|
(bit number of IN) —|BIT |
|_____|
Parameters
Parameter
enable
Description
When the enable input is on, the bit operation is performed.
IN
IN contains the address of the first word of the bit string to be operated on.
BIT
BIT contains the bit number of IN that should be set or cleared.
Valid range is (1 ≤ BIT ≤ (16 * LEN) ).
ok
The ok output is energized whenever enable is energized, unless the value at the BIT
input is outside the valid range.
LEN
LEN is the number of words in the bit string whose starting address is configured at IN..
Note
When using the Bit Test, Bit Set, Bit Clear or Bit Position function, the bits
are numbered 1 through 16, NOT 0 through 15.
8-14
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
8
Valid Memory Types
Parameter
flow
%I
%Q
%M
%T
%S
%G
%R
enable
•
IN
•
•
•
•
†
•
•
•
•
BIT
•
•
•
•
•
•
•
•
ok
•
†
%AI %AQ const
none
•
•
•
Valid reference or place where power may flow through the function.
%SA, %SB, or %SC only; %S cannot be used.
Examples
Note that the Bit Set and Bit Clear functions can only be WORD types; therefore, any memory
address used at IN will appear on a Logicmaster screen in hexadecimal format. However, the value
at BIT will appear in integer format whether a constant or memory address is used.
In the following example, when input %M0001 is on, bit 12 (specified by the BIT input) of the
string beginning at reference %R0001 (the address at the IN input) is set to 1 (set).
%M0003
%M0001
%R0001
0800
%R0002
+00012
BIT_
SET_
WORD
IN
LEN
00001
BIT
Bit Number
16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
%R0001
0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0
In the next example, when input %M0001 is on, bit 5 (the value of the BIT input) of the string
beginning at reference %R0001 (the address at the IN input) is set to 0 (cleared).
%M0003
%M0001
%R0001
7FEF
%R0002
+00005
GFK-0467M
BIT_
CLR_
WORD
IN
LEN
00001
BIT
Chapter 8 Bit Operation Functions
Bit Number
16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
%R0001
0 1 1 1 1 1 1 1 1 1 1 0 1 1 1 1
8-15
8
BPOS (WORD)
The Bit Position (BPOS) function is used to locate in a bit string, a bit whose value is logic 1.
Each sweep that the function is enabled, it scans the bit string starting at IN. When the function
stops scanning, either a bit equal to 1 has been found or the entire length of the string has been
scanned.
POS is set to the position within the bit string of the first non-zero bit; POS is set to zero if no nonzero bit is found.
A string length of 1 to 256 words can be selected. The function passes power flow to the right
whenever enable is ON.
_____
|
|
(enable) —| BIT_|— (ok)
| POS |
| WORD|
|
|
|
|
(first word) —|IN
|
|
|
| LEN |
|00001|
| POS|— (position of non-zero bit or 0)
|_____|
Parameters
Parameter
enable
Description
When the enable input is on, a bit search operation is performed.
IN
IN contains the first word of the bit string to be operated on.
ok
The ok output is energized whenever enable is energized.
POS
The position of the first non-zero bit found, or zero if a non-zero bit is not found.
LEN
LEN is the number of words in the bit string.
Note
When using the Bit Test, Bit Set, Bit Clear or Bit Position function, the bits
are numbered 1 through 16, NOT 0 through 15.
8-16
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
8
Valid Memory Types
Parameter
flow
%I
%Q
%M
%T
%S
%G
%R
enable
•
IN
•
•
•
•
•
•
•
•
•
POS
•
•
•
•
•
•
•
•
ok
•
%AI %AQ const
•
none
•
Valid reference or place where power may flow through the function.
Example
Note that the Bit Position function can only be a WORD type; therefore, any memory address used
at IN will appear on a Logicmaster screen in hexadecimal format. However, the value at POS will
appear in integer format. Logicmaster displays the first 16 bits at IN in hexadecimal format.
In the following example, if %I0001 is on, the bit string starting at %M0001 is searched until a bit
equal to 1 is found, or until the entire bit string has been searched. Coil %M0100 is turned on. If a
bit equal to 1 is found, its location within the bit string is written to %R0002; otherwise a value of 0
is written to %R0002. In the example shown, bit 5 is the first logic 1 encountered by the search
(which starts at bit 1), so the value written to %R0002 is 5.
%M0100
%I0001
%M0001
6910
BIT_
POS_
WORD
IN
LEN
00001
POS
GFK-0467M
%R0002
+00005
%M Bits
16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
Bit Value
0 1 1 0 1 0 0 1 0 0 0 1 0 0 0 0
Chapter 8 Bit Operation Functions
8-17
8
MSKCMP (WORD, DWORD)
The Masked Compare (MSKCMP) function (available for Release 4.41 or later CPUs) is used to
compare the contents of two separate bit strings with the ability to mask selected bits. The length
of the bit strings to be compared is specified by the LEN parameter (where the value of LEN
specifies the number of 16-bit words for the MSKCMP word-type function or 32-bit words for the
MSKCMP double-word type function).
When its enable input is on, the function compares the bits in the first string with the corresponding
bits in the second string. Comparison continues until a miscompare is found, or until the end of the
string is reached. The function executes each scan that the enable input is on, so, for many
applications, a “one-shot” contact is used for the enable input.
The BIT input is used to store the bit number where the next comparison should start (where a 0
indicates the first bit in the string). The BN output is used to store the bit number where the last
comparison occurred (where a 1 indicates the first bit in the string). Using the same reference for
BIT and BN causes the compare to start at the next bit position after a miscompare; or, if all bits
compared successfully upon the next invocation of the function block, the compare starts at the
beginning.
If you want to start the next comparison at some other location in the string, you can enter different
references for BIT and BN. If the value of BIT is a location that is beyond the end of the string,
BIT is reset to 0 before starting the next comparison.
If All Bits in I1 and I2 are the Same
If all corresponding bits in strings I1 and I2 match, the function sets the “miscompare” output MC
to 0 and BN to the highest bit number in the input strings. The comparison then stops. On the next
invocation of MSKCMP, BN will be reset to 0.
If a Miscompare is Found
When the two bits currently being compared are not the same, the function checks the
correspondingly numbered bit in string M (the mask). If the mask bit is a 1, the miscompare is
ignored and the comparison continues until it reaches another miscompare or the end of the input
strings.
If a miscompare is detected and the corresponding mask bit is a 0, the function does the following:
8-18
1.
Sets the corresponding mask bit in M to 1.
2.
Sets the miscompare (MC) output to 1.
3.
Updates the output bit string Q to match the new content of mask string M.
4.
Sets the bit number output (BN) to the number of the miscompared bit.
5.
Stops the comparison.
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
8
(enable)
(input parameter I1)
(input parameter I2)
(bit string mask)
(bit number)
_____
|
|
—|MASK_||
|
|COMP_|
|
|
| WORD|
|
|
—|I1 MC|— (miscompare)
| LEN |
|00001|
|
|
—|I2 Q|— (output parameter Q)
|
|
|
|
—|M BN|— (bit number for last miscompare)
|
|
|
|
—|BIT |
|_____|
Parameters
Parameter
enable
Description
Permissive logic to enable the function.
I1
Reference for the first bit string to be compared.
I2
Reference for the second bit string to be compared.
M
Reference for the bit string mask.
BIT
Reference for the bit number where the next comparison should start.
MC
Goes to a logic 1 for one scan if a miscompare has occurred. A set coil can be used on this
output if it is desired to “capture” the output beyond one scan.
Q
Output copy of the mask (M) bit string.
BN
Number of the bit where the last compare occurred.
LEN
LEN is the number of words in the bit string.
Valid Memory Types
Parameter
flow
enable
•
I1
I2
M
BIT
LEN
MC
Q
BN
•
o
†
‡
GFK-0467M
%I
%Q
%M
%T
%S
%G
%R
%AI %AQ const
o
o
o
•
o
o
o
•
o
o
o
•
o
o
o
•
o
o
o†
•
o
o
o
•
•
•
•
•
•
•
•
•
•
•
•
•
o
•
o
•
o
•
o
•
o†
•
o
•
•
•
•
•
•
•
•
none
•
•‡
•
Valid reference or place where power may flow through the function.
Valid reference for WORD data only; not valid for DWORD.
%SA, %SB, %SC only; %S cannot be used.
Max const value of 4095 for WORD and 2047 for DWORD.
Chapter 8 Bit Operation Functions
8-19
8
Example 1 – MSKCMP Instruction
When %M0200 closes, the contact from the %M0201 transition coil closes for one scan, which
enables the MSKCMP function to execute once. %M0001 through %M0016 (I1) are compared
with %M0017 through %M0032 (I2). %M0033 through %M0048 (M) contains the mask value.
The value in %R0001 (BIT) determines at which bit position (0) the comparison starts within the
two input strings at I1 and I2.
%M0201
%M0200
%M0201
%M0001
6C6C
%M0017
606F
MASK_
COMP
WORD
I1 MC
LEN
00001
Q
I2
%M0033
000F
M
%R0001
00000
BIT
BN
%M0202
%M0033
000F
%R0001
00000
Condition Before the First MSKCMP Execution
The contents of the input references before the MSKCMP executes are as follows:
%M Bits
Input 1(I1)
16 15 14 13 12 11 10
0 1 1 0 1 1 0
9
0
8
0
7
1
6
1
5
0
4
1
3
1
2
0
1
0
%M Bits
Input 2(I2)
32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17
0 1 1 0 1 1 0 1 0 1 1 0 1 1 1 1
%M Bits
Mask (M/Q)
48 47 46 45 44 43 42 41 40 39 38 37 36 35 35 33
0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1
BIT/BN (%R0001) = 0
MC (%M0202) = OFF
8-20
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
8
Condition After the First MSKCMP Execution
The following table shows the contents of the Mask (M/Q) references after the MSKCMP executes
one time. (I1 and I2 are still at the values shown above.) Since the ninth bit produced a
miscompare, the ninth bit (%M0041) in the Mask string is set to logic 1, BIT/BN contains a value
of 9, and the MC output turned on for one scan. Although the first and second bit positions are not
equal, they do not produce a miscompare because the mask bits are 1 for these positions.
%M Bits
Mask (M/Q)
48 47 46 45 44 43 42 41 40 39 38 37 36 35 35 33
0 0 0 0 0 0 0 1 0 0 0 0 1 1 1 1
BIT/BN (%R0001) = 9
MC (%M0202) = ON (for one scan)
Example 2 - Fault Detection with a Masked Compare Function
Intermittent problems can be difficult to troubleshoot. One example is when several switches are
arranged in a series circuit that energizes a fault relay. Under normal conditions, all switches are
closed and the fault relay is energized (a “fail-safe” arrangement). When a fault occurs, one of the
contacts opens and the fault relay drops out. If the faulted contact remains open, a troubleshooter
will be able to easily determine which switch caused the fault. However, sometimes a contact only
opens for a brief time, perhaps for less than a second, then closes again. This causes the fault relay
to drop out briefly and shut down the process. Since the contact closes again, everything appears
normal.
To help with such a problem, the following circuit acts as a “fault catcher” in that it detects which
contact opened and stores its number in a register. In the first rung, contacts from the input
switches, which are each wired to an input module point (%I1 – %I9), are programmed in series to
energize %M0021, a negative transition coil.
The second rung initializes the MSKCMP so it is ready to capture the fault. The first Move
instruction writes all logic ones to the I2 input of the MSKCMP. The second Move writes values
of 1 to bits 10—16 of the mask word (so that these bits are ignored), since only the first nine bits of
the compared words (the MSKCMP uses full words) are needed for switches %I0001—%I0009.
The third Move zeroes the output register, %R0001, so it is ready to report the latest fault.
During normal operation, the first nine bits on input I1 of the MSKCMP are at logic 1 since the
switches are all closed. Input I2 is initialized with all logic 1s since that is the normal condition to
which the input switches are compared. The mask has 1s in bits 10—16 because these bits are not
used since there are nine input switches. When a switch opens, %M0201’s contacts close for one
scan. This causes the initializing moves to occur in the second rung, and in the third rung, the
MSKCMP is enabled. The MSKCMP compares the input switches against the logic 1s at its I2
input, identifies which switch is logic 0 (open), and writes the bit number of the open switch to the
BN (%R0001) output. The bits are numbered from 1—9 beginning with %I1. For example, if %I4
were to open, %R0001 would contain the number 4.
Note that, in this circuit, if a switch opens and closes again, coil %M0201 drops out and picks back
up, but the number of the switch that opened will be stored in %R0001. However, if a switch
opens again, for example, the machine operator pushes an emergency stop button or opens a safety
gate, the masked compare activates again and writes the number of the latest switch opening in
%R0001. This means that the equipment should be left untouched after the fault occurs until the
value in %R0001 can be checked. If this is not practical, an additional Move instruction could be
used.
GFK-0467M
Chapter 8 Bit Operation Functions
8-21
8
%I0001 %I0002 %I0003 %I0004 %I0005 %I0006 %I0007 %I0008 %I0009
%M0201
%M0201
MOVE_
WORD
CONST
FFFF
IN
Q
MOVE_
WORD
MOVE_
WORD
%M0017 CONST
FFFF
FE00
LEN
00001
IN
Q
LEN
00001
%M0033
FE00
CONST
0000
IN
Q
%R0001
0000
LEN
00001
%M0201
%I0001
01FF
%M0017
FFFF
8-22
MASK_
COMP
WORD
I1 MC
LEN
00001
Q
I2
%M0033
FE00
M
CONST
00000
BIT
BN
%M0202
%M0033
FE00
%R0001
00000
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
Chapter
Data Move Functions
9
Data move functions provide basic data move capabilities. This chapter describes the following
data move functions:
GFK-0467M
Abbreviation
Function
Description
Page
MOVE
Move
Copy data as individual bits. The maximum length
allowed is 256 words, except MOVE_BIT is 256
bits. Data can be moved into a different data type
without prior conversion.
9-2
BLKMOV
Block Move
Copy a block of seven constants to a specified
memory location. The constants are input as part of
the function.
9-5
BLKCLR
Block Clear
Replace the content of a block of data with all zeros.
This function can be used to clear an area of bit
(%I, %Q, %M, %G, or %T) or word (%R, %AI, or
%AQ) memory. The maximum length allowed is
256 words.
9-7
SHFR
Shift Register
Shift one or more data words into a table.
The maximum length allowed is 256 words.
9-8
BITSEQ
Bit Sequencer
Perform a bit sequence shift through an array of bits.
The maximum length allowed is 256 words.
9-11
COMMREQ
Communications
Request
Allow the program to communicate with an
intelligent module, such as a Genius
Communications Module or a Programmable
Coprocessor Module.
9-15
9-1
9
MOVE (BIT, INT, WORD, REAL)
Use the MOVE function to copy data (as individual bits) from one location to another. Because the
data is copied in bit format, the new location does not need to be the same data type as the original
location.
The MOVE function has two input parameters and two output parameters. When the function is
enabled, it copies data from input parameter IN to output parameter Q as bits. If data is moved
from one location in discrete memory to another, (for example, from %I memory to %T memory),
the transition information associated with the discrete memory elements is updated to indicate
whether or not the MOVE operation caused any discrete memory elements to change state. Data at
the input parameter does not change unless there is an overlap in the input and output references.
For the BIT type there is another consideration. If a BIT array specified on the Q parameter does
not encompass all of the bits in a byte, the transition bits associated with that byte (which are not in
the array) will be cleared when the MOVE_BIT receives power flow.
Input IN can be either a reference for the data to be moved or a constant. If a constant is specified,
then the constant value is placed in the location specified by the output reference. For example, if a
constant value of 4 is specified for IN, and the length (LEN) equals 1, then 4 is placed in the
memory location specified by Q. If the length is greater than 1 and a constant is specified, then the
constant is placed in the memory location specified by Q and the locations following, up to the
length specified. For example, if the constant value 9 is specified for IN and the length equals 4,
then 9 is placed in the memory location specified by Q and also in the three locations following.
The LEN operand specifies the number of:
•
Words to be moved for MOVE_INT and MOVE_WORD.
•
Bits to be moved for MOVE_BIT.
•
Real numbers to be moved for MOVE_REAL.
Note
The REAL data type is only available on 35x and 36x series CPUs, Release 9 or
later, and all releases of CPU352 and 37x.
The function passes power to the right whenever power is received.
_____
|
|
(enable) —|MOVE_|— (ok)
|
|
| INT |
|
|
(value to be moved) —|IN Q|— (output parameter Q)
|
|
| LEN |
|00001|
|_____|
9-2
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
9
Parameters
Parameter
Description
enable
When the function is enabled, the move is performed.
IN
IN contains the value to be copied (moved). For MOVE_BIT, any discrete reference
may be used; it does not need to be byte aligned. However, a 16-bit value, beginning
with the reference address specified, is displayed on the Logicmaster screen.
ok
The ok output is energized whenever the function is enabled.
Q
When the move is performed, the value at IN is copied to Q. For MOVE_BIT, any
discrete reference may be used; it does not need to be byte aligned. However, a 16-bit
value, beginning with the reference address specified, is displayed on the Logicmaster
screen.
LEN
LEN specifies the number of words or bits to be moved. For MOVE_WORD and
MOVE_INT, LEN must be between 1 and 256 words. For MOVE_BIT, when IN
is a constant, LEN must be between 1 and 16 bits; otherwise, LEN must be between 1
and 256.
Note
On 351, 352, 36x and 37x series CPUs, the MOVE_INT and MOVE_WORD
functions do not support overlapping of IN and Q parameters, where the IN
reference is less than the Q reference. For example, with the following values:
IN=%R0001, Q=%R0004, LEN=5 (words), the %R0007 and %R0008 contents
will be indeterminate; however, using the following values: Q=%R0001,
IN=%R0004, LEN=5 (words) will yield valid contents.
Also, please note that only 35x and 36x series CPUs (Release 9.00 and later), and
all releases of CPU35 and 37x have Floating Point capabilities and are therefore
the only Series 90-30 CPUs capable of MOVE_REAL.
Valid Memory Types
Parameter
flow
enable
•
IN
ok
Q
%I
%Q
%M
%T
%S
%G
%R
%AI %AQ const
•
•
•
•
o
•
•
•
•
•
•
•
•
o†
•
•
•
•
•
none
•
•
Note: For REAL data, the only valid types are %R, %AI, and %AQ.
•
o
†
GFK-0467M
Valid reference for BIT, INT, or WORD data, or place where power may flow through the function.
For MOVE_BIT, discrete user references %I, %Q, %M, and %T need not be byte aligned.
Valid reference for BIT or WORD data only; not valid for INT.
%SA, %SB, %SC only; %S cannot be used.
Chapter 9 Data Move Functions
9-3
9
Example 1 - Overlapping Addresses (only for CPUs 311-341)
When enable input contact %Q0014 is ON, 48 bits are moved from memory location %M0001 to
memory location %M0033. Even though the destination overlaps the source for 16 bits, the move
is done correctly (except for the 35x and 35x CPUs as noted previously).
|
_____
|%Q0014 |
|
|——| |———|MOVE_|—
|
|
|
|
| WORD|
|
|
|
|%M0001 —|IN Q|—%M0033
|
|
|
|
| LEN |
|
|00003|
|
|_____|
|
Before using the Move function:
INPUT (%M0001 through %M0048)
1
%M0016
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
%M0032
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
%M0048
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
After using the Move function:
OUTPUT (%M0033 through %M0080)
33
%M0048
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
%M0064
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
%M0080
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
Example 2 – for all CPUs
In this example, whenever %I0003 is on, the values in the three bits %M0001, %M0002, and
%M0003 are moved to %M0100, %M0101, and %M0102, respectively, and coil %Q0001 is turned
on.
|
_____
|%I0003 |
|
%Q0001
|——| |———|MOVE_|——————————————————————————————————————————————————————————( )—
|
|
|
|
| BIT |
|
|
|
| %M0001—|IN Q|—%M0100
|
|
|
|
| LEN |
|
|00003|
|
|_____|
|
9-4
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
9
BLKMOV (INT, WORD, REAL)
Use the Block Move (BLKMOV) function to copy a block of seven constants to a specified
location.
Note
The REAL data type is only available on 35x and 36x series CPUs, Release 9 or
later, and all releases of CPU352 and 37x.
The BLKMOV function has eight input parameters and two output parameters. When the function
receives power flow, it copies the constant values into consecutive locations, beginning at the
destination specified in output Q. Output Q cannot be the input of another program function.
Note
For BLKMOV_INT, the values of IN1 — IN7 are displayed as signed decimals.
For BLKMOV_WORD, IN1 — IN7 are displayed in hexadecimal. For
BLKMOV_REAL, IN1— IN7 are displayed in Real format.
The function passes power to the right whenever it is enabled.
(enable)
(constant value)
(constant value)
(constant value)
(constant value)
(constant value)
(constant value)
(constant value)
_____
|
|
—|BLKMV|— (ok)
|
|
| INT |
|
|
—|IN1 Q|— (output parameter Q)
|
|
|
|
—|IN2 |
|
|
|
|
—|IN3 |
|
|
|
|
—|IN4 |
|
|
|
|
—|IN5 |
|
|
|
|
—|IN6 |
|
|
|
|
—|IN7 |
|_____|
Parameters
Parameter
enable
IN1— IN7
GFK-0467M
Description
When the function is enabled, the block move is performed.
IN1 through IN7 contain seven constant values.
ok
The ok output is energized whenever the function is enabled.
Q
Output Q contains the first integer of the moved array. IN1 is moved to Q.
Chapter 9 Data Move Functions
9-5
9
Valid Memory Types
Parameter
flow
enable
•
%I
%Q
%M
%T
%S
%G
%R
%AI %AQ const
IN1 — IN7
ok
Q
none
•
•
•
•
•
•
•
o†
•
•
•
•
Note: For REAL data, the only valid types are %R, %AI, and %AQ.
•
o
†
Valid reference for place where power may flow through the function.
Valid reference for WORD data only; not valid for INT or REAL.
%SA, %SB, %SC only; %S cannot be used.
Note
Floating Point capabilities exist only on 35x and 36x series CPUs, Release 9 or
later, and all releases of CPU352 and 37x. These 90-30 CPUs are the only ones
capable of BLKMV_REAL.
Example
In the following example, when input enable contact %M0201 is on, the BLKMOV function copies
the seven input constants into memory locations %R0001 (specified at output Q) through %R0007.
If the BLKMV executes successfully, it turns on its OK output, which energizes %M0202. In turn,
an %M0202 contact enables the Service Request function in the next rung, which uses %R0001
through %R0007 as its parameter block. (See Chapter 12 for more information on Service Request
instructions.)
%M0201
%M0202
BLKMV_
WORD
CONST
0001
IN1
CONST
0000
IN2
CONST
0000
IN3
CONST
0204
IN4
CONST
0000
IN5
CONST
0000
IN6
CONST
0000
IN7
Q
%R0001
0001
Address
%R0001
%R0002
%R0003
%R0004
%R0005
%R0006
%R0007
Value
0001
0000
0000
0204
0000
0000
0000
%M0202
%M0204
SVC_
REQ
9-6
CONST
0046
FNC
%R0001
0001
PARM
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
9
BLKCLR (WORD)
Use the Block Clear (BLKCLR) function to fill a specified block of data with zeros.
The BLKCLR function has two input parameters and one output parameter. When the function
receives power flow, it writes zeros into the memory location beginning at the reference specified
by IN. When the data to be cleared is from discrete memory (%I, %Q, %M, %G, or %T), the
transition information associated with the references is also cleared. The function passes power to
the right.
_____
|
|
(enable) —| BLK_|— (ok)
| CLR_|
| WORD|
|
|
|
|
|
|
(word to be cleared) —|IN
|
| LEN |
|00001|
|_____|
Parameters
Parameter
Description
enable
When the function is enabled, the array is cleared.
IN
IN contains the first word of the array to be cleared.
ok
The ok output is energized whenever the function is enabled.
LEN
LEN must be between 1 and 256 words.
Valid Memory Types
Parameter
flow
enable
•
IN
ok
•
†
%I
%Q
%M
%T
%S
%G
%R
•
•
•
•
•†
•
•
%AI %AQ const
•
none
•
•
•
Valid reference or place where power may flow through the function.
%SA, %SB, %SC only; %S cannot be used.
Example
In the following example, at power-up, 32 words of %Q memory (512 points) beginning at
%Q0001 are filled with zeros.
|
_____
|FST_SCN |
|
|——| |———| BLK_|—
|
|
|
|
| CLR_|
|
| WORD|
|
|
|
| %Q0001—|IN
|
|
| LEN |
|
|00032|
|
|_____|
|
GFK-0467M
Chapter 9 Data Move Functions
9-7
9
SHFR (BIT, WORD)
Use the Shift Register (SHFR) function to shift one or more data words or data bits from a
reference location into a specified area of memory. For example, one word might be shifted into an
area of memory with a specified length of five words. As a result of this shift, another word of data
would be shifted out of the end of the memory area.
Note
When assigning reference addresses, overlapping input and output reference
address ranges in multi-word functions may produce unexpected results.
The SHFR function has four input parameters and two output parameters. The reset input (R) takes
precedence over the function enable input. When the reset is active, all references beginning at the
shift register (ST) up to the length specified for LEN, are filled with zeros.
If the function receives power flow and reset is not active, each bit or word of the shift register is
moved to the next highest reference. The last element in the shift register is shifted into Q. If Q
has a unique address, the data shifted out of Q is discarded. However, if IN and Q are given the
same address, the data will re-circulate in the shift register. The highest reference of the shift
register element of IN is shifted into the vacated element starting at ST. The contents of the shift
register are accessible throughout the logic program because they are all contained in addressable
memory.
The function passes power to the right whenever power is received through the enable logic.
The function will execute once each scan while it is enabled; so it may be beneficial to use a “oneshot” type enable contact from a transition coil if it is desired to just shift one time for a given
contact closure.
(enable)
(reset)
(value to be shifted)
(first bit or word)
9-8
_____
|
|
—|SHFR_|— (ok)
|
|
| WORD|
|
|
—|R
Q|— (output parameter Q)
| LEN |
|00001|
|
|
|
|
|
|
—|IN
|
|
|
|
|
|
|
—|ST
|
|_____|
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
9
Parameters
Parameter
Description
enable
When the enable input is on and the R input is off, the shift is performed. Note that the
SHFR will execute once for each scan that it is enabled.
R
When the R input is on, the shift register located at ST is filled with zeros.
IN
IN contains the value to be shifted into the first bit or word of the shift register. For
SHFR_BIT, any discrete reference may be used; it does not need to be byte aligned.
However, 16 bits, starting with the reference address specified, are displayed online.
ST
ST contains the first bit or word of the shift register. For SHFR_BIT, any discrete
reference may be used; it does not need to be byte aligned. However, 16 bits, starting
with the reference address specified, are displayed online.
ok
The ok output is energized whenever the enable input is on and the R input is off.
Q
Output Q contains the bit or word shifted out of the shift register. For SHFR_BIT, any
discrete reference may be used; it does not need to be byte aligned. However, 16 bits,
starting with the reference address specified, are displayed online.
LEN determines the length of the shift register. For SHFR_WORD, LEN must be
between 1 and 256 words. For SHFR_BIT, LEN must be between 1 and 256 bits.
LEN
Valid Memory Types
Parameter
%I
%Q
%M
%T
IN
•
•
•
ST
•
•
•
•
•
•
enable
•
R
•
ok
Q
•
†
GFK-0467M
flow
%S
%G
%R
%AI
%AQ
const
•
•
•
•
•
•
•
•
•†
•
•
•
•
•
•†
•
•
•
•
•
none
•
Valid reference for BIT or WORD data, or place where power may flow through the function.
For SHFR_BIT, discrete user references %I, %Q, %M, and %T need not be byte aligned.
%SA, %SB, %SC only; %S cannot be used.
Chapter 9 Data Move Functions
9-9
9
Example 1
In this example, the shift register operates on three (LEN=3) memory locations, %R0002 through
%R0004. When the reset contact %I0002 is on, the three shift register words are set to zero.
When contact %I0001 closes, the %M0201 contact at the SHFR’s enable input closes for one scan.
This shifts the data in %R0004 into output Q’s address, %R0005 (the data that was in %R0005 is
discarded). The data in %R0003 shifts into %R0004; the data in %R0002 shifts into %R0003, and
the data in %R0001 (IN) shifts into %R0002 (ST). This data flow is shown in the figure below. If
desired, data can be re-circulated by using the same address at IN and Q.
%M0201
%I0001
%M0201
%I0002
%M0202
SHFR_
WORD
R
Q
LEN
00003
%R0001
IN
%R0002
ST
Data Flow Through the SHFR
%R0005
%R0001 (IN)
%R0002 (ST)
%R0003
Shift
Register
(LEN=3)
%R0004
%R0005 (Q)
Discarded
Example 2
In Example 2, the shift register is a BIT type. With a LEN of 100, it operates on memory locations
%M0001 through %M0100. When the reset reference CLEAR is active, the SHFR function fills
%M0001 through %M0100 with zeros.
When NXT_CYC (a “one-shot” contact from a transition coil) is on and CLEAR is off, the SHFR
function shifts the data in %M0001 through %M0100 up one bit. The bit in %Q0033 is shifted into
%M0001 while the bit shifted out of %M0100 is written to Q (%M0200). The previous value of Q
is discarded.
|
_____
|NXT_CYC |
|
|——| |———|SHFR_|—
|
|
|
|
| BIT |
| CLEAR |
|
|——| |———|R
Q|—%M0200
|
| LEN |
|
|00100|
|
|
|
|
|
|
|
|
|
| %Q0033—|IN
|
|
|
|
|
|
|
| %M0001—|ST
|
|
|_____|
|
9-10
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
9
BITSEQ
(BIT)
The Bit Sequencer (BITSEQ) function shifts a single logic 1 bit sequentially in a circular path
through an array of bits. When the bit is shifted to the end of the array, it will wrap around to the
other end of the array on the next shift and continue from there. The BITSEQ function has five
input parameters and one output parameter.
|
|
(enable) —| BIT_|— (ok)
|
|
| SEQ |
|
|
(reset) —|R
|
| LEN |
|00001|
(direction) —|DIR |
|
|
|
|
(number) —|STEP |
|
|
|
|
(starting address) —|ST
|
|
|
|_____|
(address) - Enter the beginning address here.
Enable Input Requirement
The Bit Sequencer’s Enable input requires a transition from logic zero to logic one in order for the
function to execute one shift, and it will not execute again until it receives another positive-going
Enable input transition. Therefore, using the contact from a positive transition coil for the Enable
input is unnecessary.
R (Reset) Input
When this input is on, the Bit Sequencer will not execute.
The reset input (R) overrides the enable (EN) and always resets the sequencer. When R is active,
the current step number is set to the value specified in the STEP number parameter and all other
bits are set to 0. If no STEP number is specified (STEP=0), the step is set to bit 1 and all other bits
are set to 0.
When EN is active and R is not active, the bit pointed to by the current step number is cleared. The
current step number is either incremented or decremented, based on the DIR (direction) parameter.
Then, the bit pointed to by the new step number is set to 1.
STEP Input
•
When the step number is being incremented and it goes outside the range of (1 ≤ step number
≤ LEN), it is set back to 1.
•
When the step number is being decremented and it goes outside the range of (1 ≤ step number
≤ LEN), it is set to LEN.
The parameter ST is optional. If it is not used (it is left equal to its default of zero), the BITSEQ
operates as described above, except that no bits are set or cleared. Basically, the BITSEQ then just
cycles the current step number through its legal range.
GFK-0467M
Chapter 9 Data Move Functions
9-11
9
DIR (Direction) Input
The direction of bit rotation can be changed by turning the DIR input on or off. If on, the bit is
incremented through the array. If off, the bit is decremented.
ST (Starting Address) Input and LEN (Length) Parameter
The ST input contains a memory location for the starting address of the sequencer array. The
length of the array, in bits, is set by the LEN parameter. For example, if ST is %M0001 and LEN
equals 16, the array is composed of %M0001 through %M0016. If ST is a %R address, then LEN
determines how many consecutive bits in %R memory are included in the array. For example, if
ST is %R0004, and LEN equals eight, only the first eight bits of register %R will be used in the
array; the last eight bits of %R0004 will be ignored by the Bit Sequencer.
Control Block Memory Required for a Bit Sequencer
Each bit sequencer uses three words (registers) of %R memory to store the following information:
current step number
word 1
length of sequence (in bits)
word 2
control word
word 3
When you program a bit sequencer with Logicmaster, you must enter a beginning address for these
three words (registers) directly below the graphic representing the function (see example on next
page).
The control word stores the state of the Boolean inputs and outputs of its associated function block,
as shown in the following format:
15 14
13
12
11 10
9
7
8
6
5
4
3
2
1
0
R e s e rv e d
R e s e rv e d
O K ( s ta tu s in p u t)
E N ( e n a b le in p u t)
Note
Bits 0 through 13 are not used in the Control Block. Also, note that bits need to be entered as 1
through 16, NOT 0 through 15 in the STEP parameter.
9-12
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
9
Parameters
Parameter
Description
address
Address is the location of the bit sequencer’s current step, length, and the last enable and
ok statuses.
enable
When the function is enabled, if it was not enabled on the previous sweep and if R is not
energized, the bit sequence shift is performed.
R
When R is energized, the bit sequencer’s step number is set to the value in STEP (default
= 1), and the bit sequencer is filled with zeros, except for the current step number bit.
DIR
When DIR is energized, the bit sequencer’s step number is incremented prior to the shift.
Otherwise, it is decremented.
STEP
When R is energized, the step number is set to this value.
ST
ST contains the first word of the bit sequencer.
ok
The ok output is energized whenever the function is enabled.
LEN
LEN must be between 1 and 256 bits.
Note
Coil checking for the BITSEQ function checks 16 bits from the ST parameter,
even when LEN is less than 16.
Valid Memory Types
Parameter
flow
%I
%Q
%M
%T
%S
%G
address
GFK-0467M
%AI
%AQ
const
•
none
•
enable
•
R
•
DIR
•
STEP
•
•
•
•
ST
•
•
•
•
ok
•
†
%R
•†
•
•
•
•
•
•
•
•
•
•
•
•
Valid reference or place where power may flow through the function.
SA, %SB, %SC only; %S cannot be used
Chapter 9 Data Move Functions
9-13
9
Example
In the following example, the Bit Sequencer operates on bits %M0011 (specified in the ST input)
through %M0022 (since LEN equals twelve). Its three-word control block is stored in registers
%R0010, %R0011, and %R0012. When %I0002 (on the R input) is on, the sequencer is reset,
which means that the bit for step three (specified in the STEP input) will be set to logic one and all
other bits will be set to zero.
When %I0001 goes to logic 1 (with %I0002 off), the bit for step number 3 is cleared and either the
bit for step number 4 will be set if DIR is on, or the bit for step number 2 will be set if DIR is off.
%M0100
%I0001
%I0002
BIT_
SEQ
R
%I0003
LEN
00012
DIR
CONST
00003
STEP
%M0011
ST
%R0010
9-14
%M Bits
Step Number
22 21 20 19 18 17 16 15 14 13 12 11
12 11 10 9 8 7 6 5 4 3 2 1
0 0 0 0 0 0 0 0 0 1 0 0
Shift Direction Shown for DIR=ON
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
9
COMMREQ
Use the Communication Request (COMMREQ) function if the program needs to communicate
with an intelligent module, such as a Genius Communications Module or a Programmable
Coprocessor Module.
Note
The information presented on the following pages shows the general format of
the COMMREQ function. You will need additional information to program the
COMMREQ for each type of device. Programming requirements for each
module that uses the COMMREQ function are described in the module’s
documentation.
The COMMREQ function has three input parameters and one output parameter. When the
COMMREQ function receives power flow, a command block of data is sent to the intelligent
module. The command block begins at the reference specified using the parameter IN. The rack
and slot # of the intelligent module are specified in SYSID.
The COMMREQ may either send a message and wait for a reply, or send a message and continue
without waiting for a reply. If the command block specifies that the program will not wait for a
reply, the command block contents are sent to the receiving device and the program execution
resumes immediately. (The timeout value is ignored.) This is referred to as NOWAIT mode.
If the command block specifies that the program will wait for a reply, the command block contents
are sent to the receiving device and the CPU waits for a reply. The maximum length of time the
PLC will wait for the device to respond is specified in the command block. If the device does not
respond within that time, program execution resumes. This is referred to as WAIT mode.
The Function Faulted (FT) output may be set ON if:
1.
The specified target (SYSID) is not present in that location.
2.
The specified task (TASK) number is not valid for the targeted device
3.
The data length is 0 (in the Command Block).
4.
The device’s status pointer address (part of the Command Block) does not exist. This may be
due to an incorrect memory type selection, or an address within that memory type that is out of
range.
Command Block
The Command Block provides information to the targeted intelligent module. It contains the
command number to be performed as well as any data to be transferred.
The address of the Command Block is specified at the IN input to the COMMREQ function. This
address may be in any word-oriented area of memory (%R, %AI, or %AQ). The length of the
command block depends on the type of module targeted by the COMMREQ and the amount of
data to be sent.
GFK-0467M
Chapter 9 Data Move Functions
9-15
9
The command block has the following structure:
Length (in words)
Wait/No Wait Flag
address
address + 1
Status Pointer Memory
Status Pointer Offset
address + 2
address + 3
Idle Timeout Value
Maximum Communication Time
address + 4
address + 5
Data Block
address + 6
to
address + 133
Information required for the command block can be placed in command block memory using an
appropriate programming function such as a Block Move or a series of Moves.
(enable)
(first word of Command block)
(rack/slot number)
(task ID)
_____
|
|
—|COMM_|—
|
|
| REQ |
|
|
—|IN FT|—
|
|
—|SYSID|
|
|
—|TASK |
|_____|
Parameters
Parameter
Description
enable
While the enable input is on, the communications request is performed once per scan. If
it is not desirable to send the COMMREQ multiple times, the enable input should be a
contact from a Transition Coil.
IN
IN contains the starting address of the first word of the command block.
SYSID
SYSID contains the rack number (most significant byte) and slot number (least
significant byte) of the targeted module.
TASK
TASK contains the task ID of the process on the targeted module.
FT
The FT (fault) output is energized if an error is detected processing the COMMREQ.
Note
The Series 90-30 COMMREQ does not have an OK output.
Valid Memory Types
Parameter
flow
enable
•
%I
%Q
%M
%T
%S
%G
IN
SYSID
•
•
•
•
TASK
FT
•
9-16
•
%R
%AI
%AQ
•
•
•
•
•
•
•
•
•
•
•
•
const
none
•
Valid reference or place where power may flow through the function.
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
9
Example
In the following example, when enable input %I0001 is on, a command block starting at %R0100
(specified at the IN input) is sent to communications task 1 (TASK input = 1) in the module located
at rack 0, slot 8 (SYSID=0008) of the PLC. If an error occurs while processing the COMMREQ,
the Fault (FT) output turns on, which turns on %M0100.
Notice that the address at input IN specifies the starting address of the Command Block. Also, the
hex. number at SYSID specifies the rack and slot number of the targeted module; the high byte
refers to the rack number and the low byte refers to the slot number. Therefore, the SYSID of 0008
in the example refers to rack 00 and slot 08, as shown. Rack 0 (zero) always refers to the main or
CPU rack, so if the targeted module was in an expansion or remote rack, the high byte of SYSID
would contain a non-zero number that corresponds to the configured rack number where the
targeted module is located.
%I0001
COMM_
REQ
%R0100
IN
%M0100
FT
LEN
00001
CONST
SYSID
0008
CONST
TASK
00001
Command Block
%R0100
%R0101
%R0102
%R0103
Etc.
GFK-0467M
Chapter 9 Data Move Functions
Series 90-30 PLC, Rack 0
Power CPU
Supply
Slot Number:
1
2
3
4
5
6
7
8
9 10
9-17
Chapter
Table Functions
10
Table instructions are used to perform the following functions:
Abbreviation
Function
ARRAY_MOVE
Array Move
Description
Page
10-2
SRCH_EQ
Search Equal
Copy a specified number of data elements from a source
array to a destination array.
Search for all array values equal to a specified value.
SRCH_NE
SRCH_GT
Search Not Equal Search for all array values not equal to a specified value.
Search Greater
Search for all array values greater than a specified value.
Than
10-7
10-7
SRCH_GE
Search Greater
Than or Equal
10-7
SRCH_LT
SRCH_LE
Search Less Than Search for all array values less than a specified value.
Search Less Than Search for all array values less than or equal to a
or Equal
specified value.
Search for all array values greater than or equal to a
specified value.
10-7
10-7
10-7
The maximum length allowed for these functions is 32,767 bytes or words, or 262,136 bits (bits are
available for ARRAY_MOVE only).
Table functions operate on these types of data:
Data Type
INT
DINT
BIT *
Description
Signed integer.
Double precision signed integer.
Bit data type.
BYTE
Byte data type.
WORD
Word data type.
* Only available for ARRAY_MOVE.
The default data type is signed integer. The data type can be changed after selecting the specific
data table function in the ladder logic software. To compare data of other types or of two different
types, first use the appropriate conversion function (described in chapter 11, “Conversion
Functions”) to change the data to one of the data types listed above.
GFK-0467M
10-1
10
ARRAY_MOVE (INT, DINT, BIT, BYTE, WORD)
Arrays and Data Elements Defined
For the purpose of this discussion, an array is a grouping of contiguous addressable PLC memory,
such as %R0100 through %R0120. A data element is the data held in one unit of array memory.
For example, if an array is a Bit type, then each data element is held in a single bit of memory, such
as %M0001 (or it could be a single bit in register-type memory). Or, if an array is a Word type,
then each data element is held in a 16-bit word of memory, such as %R0100 (or it could be 16
consecutive %I bits). See the “Valid Memory Types” table for more information on this.
Index Numbers
Each data element of an array has a reference number called an index number, which is
automatically assigned by the PLC. The index number indicates the data element’s position in the
array. The data elements are numbered in ascending order, starting with the lowest memory
address in the array, which is assigned index number one.
For example, the following Word-type array has a starting address of %R0105. It has ten data
elements, whose index numbers are 1 through 10.
Address
Index
No.
%R0105
1
%R0106
2
%R0107
3
%R0108
4
%R0109
5
%R0110
6
%R0111
7
%R0112
8
%R0113
9
%R0114
10
The Array Move Instruction
Use the Array Move function to copy a specified number of data elements from a source array to a
destination array. Each array referenced by an Array Move instruction has an equal number of data
elements. The Array Move allows the relative locations involved in the move to be different
between the source and destination arrays. For example, three data elements, starting at index 5 in
the source array, may be copied to three data elements in the destination array starting at index 7.
10-2
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
10
The ARRAY_MOVE function has five input parameters and two output parameters. When the
function is enabled, the number of data elements in the count indicator (N) are copied from the
input array starting with the indexed location specified at the SNX input. The data elements are
written to the output array starting with the indexed location specified at DNX The LEN operand
specifies the number of elements that make up each array.
For ARRAY_MOVE_BIT, when word-oriented memory is selected for the parameters of the
source array and/or destination array starting address, the least significant bit of the specified word
is the first bit of the array. The value displayed on the Logicmaster screen contains 16 bits,
regardless of the length of the array.
The indices in an ARRAY_MOVE instruction are 1-based. In using an ARRAY_MOVE, no
element outside either the source or destination arrays (as specified by their starting address and
length) may be referenced.
The ok output will receive power flow, unless one of the following conditions occurs:
•
Enable is OFF.
•
(N + SNX – 1) is greater than LEN. This formula is used by the PLC to ensure that no element
outside the source array is referenced.
•
(N + DNX – 1) is greater than LEN. This formula is used by the PLC to ensure that no element
outside the destination array is referenced.
•
SNX or DXN = 0.
(enable)
(source array address)
(source array index)
(destination array index)
(elements to transfer )
GFK-0467M
Chapter 10 Table Functions
_____
|
|
—|ARRAY|— (ok)
|
|
|MOVE_|
|
|
| BIT |
|
|
—|SR DS|— (destination array address)
| LEN |
|00001|
—|SNX |
|
|
|
|
—|DNX |
|
|
|
|
—|N
|
|_____|
10-3
10
Parameters
Parameter
Description
enable
When the enable input is on, the Array Move operation is performed.
SR
SR contains the starting address of the source array. For ARRAY_MOVE_ BIT, any
reference may be used; it does not need to be byte aligned. However, 16 bits, beginning
with the reference address specified, are displayed on the Logicmaster screen.
SNX
SNX contains the index number in the source array of the first data element to be copied.
DNX
DNX contains the index number in the destination array of the first element to be copied
to.
N
The number of data elements to be copied.
ok
The ok output is energized whenever enable is energized.
DS
DS contains the starting address of the destination array. For ARRAY_MOVE_ BIT,
any reference may be used; it does not need to be byte aligned. However, 16 bits,
beginning with the reference address specified, are displayed online.
LEN
LEN specifies the number of data elements, starting at SR and DS, that make up each
array.
Valid Memory Types
Parameter
flow
enable
•
10-4
%M
%T
%S
%G
Ơ
%R
%AI
%AQ
const
SR
o
o
o
o
o
•
•
•
•
•
•
•
•
•
•
•
•
DNX
•
•
•
•
•
•
•
•
•
N
•
•
•
•
•
•
•
•
•
DS
o
∆
†
%Q
SNX
ok
•
%I
•
none
•
o
o
o
o
†
o
•
•
•
Valid reference or place where power may flow through the function.
For ARRAY_MOVE_BIT, discrete user references %I, %Q, %M, and %T need not be byte aligned.
Valid reference for INT, BIT, BYTE, or WORD data only; not valid for DINT.
Valid data type for BIT, BYTE, or WORD data only; not valid for INT or DINT.
%SA, %SB, %SC only; %S cannot be used.
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
10
Example 1
In this example, both arrays are INT types that are10 elements (integers) long, specified by
LEN=10. Their starting addresses are specified at SR and DS. When enable contact %M0201 is
on, five data elements (specified by N=5) are copied from the source array to the destination array.
The five copied data elements of the source array start with index number 3, since SNX=3. The
locations copied to in the destination array start with index number 5, since DNX=5. So %R0003
through %R0007 of the source array are read and then copied into %R0104 through %R0108 of the
destination array.
%M0201
%M0202
ARRAY
MOVE_
INT
%R0001
SR
DS
%R0100
LEN
00010
CONST
+00003
SNX
CONST
+00005
DNX
CONST
+00005
N
Source Array
Destination Array
%R0001
%R0002
%R0003
%R0004
%R0005
%R0006
%R0007
%R0008
%R0009
%R0010
%R0100
%R0101
%R0102
%R0103
%R0104
%R0105
%R0106
%R0107
%R0108
%R0109
Example 2
In this example, both arrays are BIT types that are10 elements (bits) long, specified by LEN=10.
Their starting addresses are specified at SR and DS. When enable contact %M0201 is on, four data
elements (specified by N=4) are copied from the source array to the destination array. The four
copied data elements of the source array start with index number 4, since SNX=4. The locations
copied to in the destination array start with index number 2, since DNX=2. So %M0012 through
%M0015 of the source array are read and then copied into %Q0023 through %Q0026 of the
destination array.
%M0201
%M0202
ARRAY
MOVE_
BIT
%M0009
SR
DS
LEN
00010
GFK-0467M
CONST
+00004
SNX
CONST
+00002
DNX
CONST
+00004
N
Chapter 10 Table Functions
%Q0022
Source Array
Destination Array
%M0009
%M0010
%M0011
%M0012
%M0013
%M0014
%M0015
%M0016
%M0017
%M0018
%Q0022
%Q0023
%Q0024
%Q0025
%Q0026
%Q0027
%Q0028
%Q0029
%Q0030
%Q0031
10-5
10
Example 3
In this example, both arrays are BIT types that are 20 elements (bits) long, specified by LEN=20.
Their starting addresses are specified at SR and DS. When enable contact %M0201 is on, 12 data
elements (specified by N=12) are copied from the source array to the destination array. The 12
copied data elements of the source array start with index number 6, since SNX=6. The locations
copied to in the destination array start with index number 8, since DNX=8. So %R0001, bit 6
through %R0002, bit 1 of the source array are read and then copied into %R0100, bit 8 through
%R0101, bit 3 of the destination array.
%M0201
%M0202
ARRAY
MOVE_
BIT
%R0001
SR
DS
LEN
00020
10-6
CONST
00006
SNX
CONST
00008
DNX
CONST
00012
N
%R0100
Source Array
Destination Array
%R0001, bit 1
%R0001, bit 2
%R0001, bit 3
%R0001, bit 4
%R0001, bit 5
%R0001, bit 6
%R0001, bit 7
%R0001, bit 8
%R0001, bit 9
%R0001, bit 10
%R0001, bit 11
%R0001, bit 12
%R0001, bit 13
%R0001, bit 14
%R0001, bit 15
%R0001, bit 16
%R0002, bit 1
%R0002, bit 2
%R0003, bit 3
%R0003, bit 4
%R0100, bit 1
%R0100, bit 2
%R0100, bit 3
%R0100, bit 4
%R0100, bit 5
%R0100, bit 6
%R0100, bit 7
%R0100, bit 8
%R0100, bit 9
%R0100, bit 10
%R0100, bit 11
%R0100, bit 12
%R0100, bit 13
%R0100, bit 14
%R0100, bit 15
%R0100, bit 16
%R0101, bit 1
%R0101, bit 2
%R0101, bit 3
%R0101, bit 4
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
10
Search Functions
Use the appropriate Search function listed below to search for all array values for that particular
operation.
Abbreviation
Function
Description
SRCH_EQ
Search Equal
SRCH_NE
Search Not Equal
Search for all array values equal to a specified value.
Search for all array values not equal to a specified value.
SRCH_GT
Search Greater
Than
Search for all array values greater than a specified value.
SRCH_GE
Search Greater
Than or Equal
Search for all array values greater than or equal to a
specified value.
SRCH_LT
Search Less Than
Search for all array values less than a specified value.
SRCH_LE
Search Less Than
or Equal
Search for all array values less than or equal to a specified value.
Each function has four input parameters and two output parameters. When the function receives
power, the array is searched starting at (AR + input NX). This is the starting address of the array
(AR) plus the index into this array (input NX).
The search continues until the array element of the search object (IN) is found or until the end of
the array is reached. If an array element is found, output parameter (FD) is set ON and output
parameter (output NX) is set to the relative position of this element within the array. If no array
element is found before the end of the array is reached, then output parameter (FD) is set OFF and
output parameter (output NX) is set to zero.
The valid values for input NX are 0 to LEN — 1. NX should be set to zero to begin searching at
the first element. This value increments by one at the time of execution. Therefore, the values of
output NX are 1 to LEN. If the value of input NX is out-of-range, (< 0 or ≥ LEN), its value is set
to the default value of zero.
(enable)
(starting address)
(input index)
(object of search)
GFK-0467M
Chapter 10 Table Functions
_____
|
|
—|SRCH_|
|
|
| EQ_ |
|
|
| WORD|
|
|
—|AR FD|—
| LEN |
|00001|
—|NX NX|— (output index)
|
|
|
|
—|IN
|
|_____|
10-7
10
Parameters
Parameter
enable
Description
When the enable input is on, the operation is performed.
AR
AR contains the starting address of the array to be searched (the target array).
Input NX
Input NX contains an index number (in the target array) where the search is to begin.
IN
IN contains the object to be searched for.
Output NX
FD
If the object of the search is found, its location in the array (its index number) will be
written here.
This output turns on to indicate that the searched for object has been found in the array.
LEN
LEN specifies the number of elements starting at AR that make up the array to be
searched. It may be 1 to 32,767 bytes or words.
Valid Memory Types
Parameter
enable
%I
%Q
%M
%T
o
o
o
o
NX in
•
•
•
•
IN
o
o
o
o
NX out
•
•
•
•
•
o
∆
%S
%G
%R
%AI
%AQ
const
none
•
AR
FD
10-8
flow
∆
∆
o
•
•
•
•
•
•
•
•
o
•
•
•
•
•
•
•
•
•
•
Valid reference or place where power may flow through the function.
Valid reference for INT, BYTE, or WORD data only; not valid for DINT.
Valid reference for BYTE or WORD data only; not valid for INT or DINT.
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
10
Example 1
The SRCH_EQ function (INT type) in this example searches the block of memory that starts at
%R0001 (specified at AR) and continues through %R0010 (LEN=10). The value to be searched
for, defined at IN, is +16566. Input NX, with a value of 3, indicates that the search is to begin at
the fourth data element in the array since the NX value is incremented by 1 when the function
executes.
When enable contact %M0201 is on, the SRCH_EQ function searches the specified array, starting
at index number 4, for a value equal to the value at IN, +16566. It finds this value in %R0007,
which has an index number of 7, so it writes the number 7 into the output NX at %R0100. It also
turns on output FD, which indicates that it found the search object in the array. Note that although
address %R0002 also contains the searched-for value of +16566, this data element was not
included in the search because the input NX parameter value of 3 specified that the search start
with the fourth data element, which is %R0004.
%M0201
%M0202
SRCH_
EQ_
INT
%R0001
TARGET ARRAY
Index No. Address
Value
AR FD
LEN
00010
GFK-0467M
CONST
00003
NX NX
%R0100
+16566
IN
Chapter 10 Table Functions
%R0100
00007
1
2
3
4
5
6
7
8
9
10
%R0001
%R0002
%R0003
%R0004
%R0005
%R0006
%R0007
%R0008
%R0009
%R0010
00000
+16566
+12345
+32000
+07870
-00550
+16566
-12343
+00058
+19238
10-9
10
Example 2
The array in this example starts at %AI0001 (specified at AR) and continues through %AI0016
(LEN=16). The value to be searched for, defined at IN, is +16566. The input NX, with a starting
value of 0, indicates that the search is to begin at the first data element in the array since the NX
value increments by 1 when the function executes.
When %M0200 closes for the first time, the function executes its first search, starting with data
element 1, for a value equal to the value at IN, 00000. It finds this value in %AI0003, which has an
index number of 3, so it writes the number 3 into the output NX and input NX, which both have the
reference address of %R0001. It also turns on output FD, which indicates that it found the search
object in the array.
When %M0200 closes the second time, the input NX value, which is now set to 3, increments by 1,
so the second search begins at the fourth array element, %AI0004. The target value of 00000 is
now found in %AI0007, the seventh data element, so the number 7 is written to %R0001. Each
succeeding search follows this pattern, until the fifth search, in which no target is found. Since no
target is found, a 0 is written to %R0001, which will ensure that the search will start at the
beginning of the array the next time the search is initiated.
Search No.
Search Starts
at Data
Element
Search Results
(in %R0001)
1
2
3
4
5
1
4
8
12
16
3
7
11
15
0
%M0200
%M0201
%M0201
%M0202
SRCH_
EQ_
INT
%AI0001
AR FD
LEN
00016
%R0001
00000
CONST
00000
10-10
NX NX
IN
%R0001
00000
TARGET ARRAY
Index No. Address
Value
%AI0001 00100
1
%AI0002 +16566
2
%AI0003 00000
3
%AI0004 +32000
4
%AI0005 +07870
5
%AI0006 -00550
6
%AI0007 00000
7
%AI0008 -12343
8
%AI0009 +00058
9
%AI0010 +19238
10
%AI0011 00000
11
%AI0012 +16566
12
%AI0013 +12345
13
%AI0014 +32000
14
%AI0015 00000
15
%AI0016 -00550
16
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
Chapter
Conversion Functions
11
Use the conversion functions to convert a data item from one number type to another. Many
programming instructions, such as math functions, must be used with data of one type. This
section describes the following conversion functions:
Abbreviation
Function
BCD-4
Convert to BCD-4
INT
DINT
GFK-0467M
Convert to Signed Integer
Description
Convert a signed integer to 4-digit BCD
format.
Convert BCD-4 or REAL to signed integer.
Page
11-2
11-3
Convert to Double Precision Convert REAL to double precision signed
Signed Integer
integer format.
11-5
REAL
Convert to REAL
Convert INT, DINT, BCD-4, or WORD to
REAL.
11-7
WORD
Convert to WORD
Convert REAL to WORD format.
11-9
TRUN
Truncate
Round the real number toward zero.
11-11
11-1
11
—>BCD-4 (INT)
The Convert to BCD-4 function is used to output the 4-digit BCD equivalent of signed integer data.
The original data is not changed by this function. Data can be converted to BCD format to drive
BCD-encoded LED displays or presets to external devices such as high-speed counters.
When the function receives power flow, it performs the conversion, making the result available via
output Q. The function passes power flow when power is received, unless the specified conversion
would result in a value that is outside the range 0 to 9999.
Enable
Value to be converted
INT_
TO_
BCD4
IN
Q
OK
Converted value
Parameters
Parameter
Description
enable
IN
ok
When the function is enabled, the conversion is performed.
IN contains a reference for the integer value to be converted to BCD-4.
The ok output is energized when the function is performed without error.
Q
Output Q contains the BCD-4 form of the original value in IN.
Valid Memory Types
Parameter
flow
enable
•
IN
ok
Q
•
%I
%Q
%M
%T
•
•
•
•
%S
%G
%R
%AI
%AQ
const
•
•
•
•
•
•
none
•
•
•
•
•
•
•
•
•
Valid reference or place where power may flow through the function.
Example
In the following example, when input %I0002 is set and no errors exist, the integer at input location
%M0017 through %M0032 is converted to four BCD digits, and the result is stored in memory
locations %Q0033 through %Q0048. Coil %M0032 turns on to verify successful conversion.
|
_____
|%I0002 |
|
%M0032
|——| |———| INT_|———————————————————————————————————————————————————————————( )—
|
| TO_ |
|
|
|
|
| BCD4|
| %M0017—|IN Q|—%Q0033
|
|_____|
|
11-2
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
11
—>INT
(BCD-4, REAL)
The Convert to Signed Integer function is used to output the integer equivalent of BCD-4 or REAL
data. The original data is not changed by this function.
Note
The REAL data type is only available on 35x and 36x series CPUs, Release 9 or
later, and on all releases of CPU352 and CPU37x.
When the function receives power flow, it performs the conversion, making the result available via
output Q. The function always passes power flow when power is received, unless the data is out of
range.
Enable
Value to be converted
BCD4_
TO_
INT
IN
Q
OK
Converted value
Parameters
Parameter
Description
enable
When the enable input is on, the conversion is performed.
IN
IN contains a reference for the BCD-4, REAL, or Constant value to be converted to
integer.
ok
The ok output is energized whenever enable is energized, unless the data is out of range
or NaN (Not a Number).
Q
Output Q contains the integer form of the original value in IN.
Valid Memory Types
Parameter
flow
enable
•
IN
ok
Q
%I
%Q
%M
%T
•
•
•
•
%S
%G
%R
%AI
%AQ
const
•
•
•
•
•
•
none
•
•
•
•
•
•
•
•
•
Note: For REAL data, the only valid types are %R, %AI, and %AQ.
•
GFK-0467M
Valid reference or place where power may flow through the function.
Chapter 11 Conversion Functions
11-3
11
Example 1 – BCD4 to Integer
In the following example, whenever input %I0002 is set, the BCD-4 value in PARTS is converted
to a signed integer and placed in %R0001. In the following ADD function, %R0001 is added to the
signed integer value represented by the reference RUNNING. The sum is output by the ADD
function to the reference TOTAL.
|
_____
_____
|%I0002 |
|
|
|
|——| |———|BCD4_|————————————————| ADD_|—
|
|
|
|
|
|
| TO_ |
| INT |
|
|
|
|
|
|
| INT |
|
|
| PARTS -|IN Q|- %R0001 %R0001 |I1 Q|- TOTAL
|
|_____|
|
|
|
RUNNING-|I2
|
|
|
|
—————
Example 2 – Real to Integer
This example shows conversion of a real number at %R0101 to an integer number at %R0200.
When the enable input contact %M0100 is on, the conversion takes place. Note that during the
conversion, the real number is rounded to the nearest integer. If the decimal portion of the real
number is 0.5 or greater, the resulting integer is rounded up by a value of 1. If the decimal portion
of the real number is less than 0.5, this decimal portion is discarded and the integer number is not
rounded up. In the example below, real value 378.9462 is rounded up to integer value 379.
If rounding is not wanted, use the REAL_TRUN_INT function, which truncates the decimal
portion of the real number, regardless of its value, during the conversion.
%M0101
%M0100
REAL_
TO_
INT
%R0101
+378.9462
11-4
IN
Q
%R0200
+00379
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
11
—>DINT (REAL)
The Convert to Double Precision Signed Integer function is used to output the double precision
signed integer equivalent of real data. The original data is not changed by this function.
Note
The REAL data type is only available on 35x and 36x series CPUs, Release 9 or
later, and on all releases of CPU352 and CPU37x.
When the function receives power flow, it performs the conversion, making the result available via
output Q. The function always passes power flow when power is received, unless the real value is
out of range.
_____
|
|
(enable) —| REAL|— (ok)
|
|
| TO_ |
|
|
| DINT|
(value to be converted) —|IN Q|— (output parameter Q)
|_____|
Parameters
Parameter
enable
Description
When the function is enabled, the conversion is performed.
IN
IN contains a reference for the value to be converted to double precision integer.
ok
The ok output is energized whenever enable is energized, unless the real value is out of
range.
Q
Q contains the double precision signed integer form of the original value in IN.
Note
It is possible for a loss of precision to occur when converting from REAL to
DINT since the REAL has 24 significant bits.
Valid Memory Types
Parameter
flow
enable
•
IN
ok
•
%I
o
%Q
%M
%T
o
o
o
%S
%G
%R %AI %AQ const
o
Q
•
GFK-0467M
•
•
•
•
•
•
none
•
•
Valid reference or place where power may flow through the function.
Chapter 11 Conversion Functions
11-5
11
Example
In the following example, whenever enable input %M0100 is on, the real value at input location
%R0101 is converted to a double precision signed integer, and the result is placed in location
%R0200. Note that during the conversion, the real number is rounded to the nearest integer. If the
decimal portion of the real number is 0.5 or greater, the resulting integer is rounded up by a value
of 1. If the decimal portion of the real number is less than 0.5, this decimal portion is discarded
and the integer number is not rounded up. In the example below, real value 7890.542 is rounded
up to double integer value 7891.
If rounding is not wanted, use the REAL_TRUN_DINT function, which truncates the decimal
portion of the real number, regardless of its value, during the conversion.
%M0101
%M0100
REAL_
TO_
DINT
%R0101
+7890.542
11-6
IN
Q
%R0200
+0000007891
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
11
—>REAL (INT, DINT, BCD-4, WORD)
The Convert to Real function is used to output the real value of the input data. The original data is
not changed by this function.
When the function receives power flow, it performs the conversion, making the result available via
output Q. The function passes power flow when power is received, unless the specified conversion
would result in a value that is out of range.
It is possible for a loss of precision to occur when converting from DINT to REAL since the
number of significant bits is reduced to 24.
Note
This function is only available on 35x and 36x series CPUs, Release 9 or later,
and on all releases of CPU352 and CPU37x.
_____
|
|
(enable) —| INT_|— (ok)
|
|
| TO_ |
|
|
| REAL|
(value to be converted) —|IN Q|— (output parameter Q)
|_____|
Parameters
Parameter
enable
Description
When the function is enabled, the conversion is performed.
IN
IN contains a reference for the integer value to be converted to REAL.
ok
The ok output is energized when the function is performed without error.
Q
Q contains the REAL form of the original value in IN.
Valid Memory Types
Parameter
flow
enable
•
IN
ok
%I
%Q
o
o
%M
%T
o
o
%S
%G
%R
%AI
%AQ
const
o
•
•
•
•
•
•
•
•
Q
•
o
GFK-0467M
none
•
Valid reference or place where power may flow through the function.
Not valid for DINT_TO_REAL.
Chapter 11 Conversion Functions
11-7
11
Example 1 - Integer to Real Conversion
In the following example, the integer value of input IN is +07891. The resulting value placed in
%R0200 after the conversion to real format is +7891.000.
%M0101
%M0100
INT_
TO_
REAL
%R0101
+07891
IN
Q
%R0200
+7891.000
Example 2 – Double Integer to Real Conversion
In the following example, the double integer value of input IN is +1234567891. The resulting
value placed in %R0200 after the conversion to real format is +1234568000. Note that a double
integer number has 10 significant places, but a real number has only 7 significant places; therefore,
an integer number is rounded to 7 significant places during the conversion to a real number. In the
example shown, the four least significant digits, 7891, of the double integer number are rounded to
8000 in the four least significant digits of the real number.
%M0101
%M0100
DINT_
TO_
REAL
%R0101
+1234567891
11-8
IN
Q
%R0200
+1234568000.
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
11
—>WORD (REAL)
The Convert to WORD function is used to output the WORD equivalent of real data. The original
data is not changed by this function.
Note
This function is only available on the 35x, 36x, and 37x series CPUs.
When the function receives power flow, it performs the conversion, making the result available via
output Q. The function passes power flow when power is received, unless the specified conversion
would result in a value that is outside the range 0 to FFFFh.
_____
|
|
(enable) —| REAL|— (ok)
|
|
| TO_ |
|
|
| WORD|
(value to be converted) —|IN Q|— (output parameter Q)
|_____|
Parameters
Parameter
enable
Description
When the function is enabled, the conversion is performed.
IN
IN contains a reference for the value to be converted to WORD.
ok
The ok output is energized when the function is performed without error.
Q
Q contains the unsigned integer form of the original value in IN.
Valid Memory Types
•
GFK-0467M
Parameter
flow
enable
IN
•
ok
Q
•
%I
%Q
%M
%T
%S
%G
%R
%AI
%AQ
const
•
•
•
•
•
•
•
none
•
•
•
•
•
•
Valid reference or place where power may flow through the function.
Chapter 11 Conversion Functions
11-9
11
Example – Real to Word Conversion
In this example, since the RANGE function is not available as a REAL type, the real value in
%R0001 is first converted to a word value (at %R0003), which is then used as the input to the
following RANGE WORD function.
The table below shows the values at the various inputs and outputs for the following figure.
Item
Value or State
%R0001
15767.83
%R0003
3A89h (15,768 decimal)
HI LIM
4E20h (20,000 decimal)
LOW LIM
2710h (10,000 decimal)
Q1
ON
|
_____
_____
|%I0002 |
|
|
|
|——| |———|REAL_|————————————————|RANGE|—
|
|
|
|
|
|
| TO_ |
| WORD|
|
|
|
|
|
|
| WORD|
|
|
%Q0001
| %R0001—|IN Q|-%R0003 HI_LIM-|L1 Q|———( )————
|
|_____|
|
|
|
|
|
|
LOW_LIM-|L2
|
|
|
|
|
|
|
|
%R0003-|IN
|
|
—————
11-10
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
11
TRUN (INT, DINT)
The Truncate function is used to round a real number toward zero. During the conversion, all
numbers to the right of the decimal place are discarded in the output number. The original number
is not changed by this function.
Note
The 35x and 36x series CPUs (Release 9.00 or later and all releases of CPU352),
and 37x are the only Series 90-30 CPUs with floating point capability; therefore,
the TRUN function has no applicability for other 90-30 CPUs.
When the function receives power flow, it performs the conversion, making the result available via
output Q. For CPU 352, the function passes power flow when power is received, unless the
specified conversion would result in a value that is out of range or unless IN is NaN (Not a
Number). For all other 35x and 36x/37x series CPUs, the function does not pass power.
_____
|
|
(enable) —|REAL_|— (ok)
|
|
|TRUN_|
|
|
| INT |
(value to be converted) —|IN Q|— (output parameter Q)
|_____|
Parameters
Parameter
Enable
Description
When the function is enabled, the conversion is performed.
IN
IN contains a reference for the real value to be truncated.
Ok
The ok output is energized when the function is performed without error, unless the value is
out of range or IN is NaN.
Q
Q contains the truncated INT or DINT value of the original value in IN.
Note
It is possible for a loss of precision to occur when converting from REAL to
DINT since the REAL has 24 significant bits.
Valid Memory Types
Parameter
flow
enable
•
IN
ok
•
Q
•
o
GFK-0467M
%I
%Q
%M
%T
%S
%G
%R
%AI
%AQ
const
•
•
•
•
•
•
•
none
•
o
o
o
o
o
Valid reference or place where power may flow through the function.
Valid for REAL_TRUN_INT only.
Chapter 11 Conversion Functions
11-11
11
Example 1 – Truncate Real to Integer with Output Coil for CPU352
In the following example, the value at %R0101 is truncated (the decimal portion is discarded) and
the resulting integer value of +05432 is placed into %R0200. . If a CPU352 were used, %M0101
would turn on, indicating a successful conversion. If any other 35x, 36x, or 37x CPU is used, no
power flow is produced at the OK output, so no output coil would be programmed.
%M0101
%M0100
REAL_
TRUN_
INT
%R0101
+5432.765
IN
Q
%R0200
+05432
Example 2 – Truncate Real to Double Integer with Output Coil for CPU352
In the following example, the value at %R0101 is truncated (the decimal portion is discarded) and
the resulting double integer value of +0000005432 is placed into %R0200. If a CPU352 were used,
%M0101 would turn on, indicating a successful conversion. If any other 35x, 36x, or 37x CPU is
used, no power flow is produced at the OK output, so no output coil would be programmed.
%M0101
%M0100
REAL_
TRUN_
DINT
%R0101
+5432.765
11-12
IN
Q
%R0200
+0000005432
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
Chapter
Control Functions
12
This chapter describes the control functions, which can be used to limit program execution and
alter the way the CPU executes the application program. Refer to Chapter 2, section 1, “PLC
Sweep Summary,” for information on the CPU sweep.
Function
Description
Page
CALL
Causes program execution to go to a specified subroutine block.
12-2
DOIO
For one sweep, immediately services a specified range of inputs or outputs. (All inputs or outputs on a
module are serviced if any reference locations on that module are included in the DO I/O function.
Partial I/O module updates are not performed.) Optionally, a copy of the scanned I/O can be placed in
internal memory, rather than the real input points.
12-3
SER
Sequential Event Recorder— collects a series of samples. A function control block contains usersupplied configuration of function block execution, sample configuration and operation parameters.
12-8
END
Provides a temporary end of logic. The program executes from the first rung to either the last rung or
the END instruction, whichever is encountered first. This instruction is useful for debugging purposes,
but it is not permitted in SFC programming (refer to the Note on page 12-8).
12-23
Programs a Master Control Relay. An MCR causes all rungs between the MCR and its subsequent
ENDMCR to be executed without power flow. Logicmaster 90-30/20/Micro software supports two
forms of the MCR function, a nested form (MCRN) and a non-nested form (MCR).
12-24
Indicates that the subsequent logic is to be executed with normal power flow. Logicmaster 9030/20/Micro software supports two forms of the ENDMCR function, a nested form (ENDMCRN) and
a non-nested form (ENDMCR).
12-30
Causes program execution to jump to a specified location (indicated by a LABEL, see below) in the
logic. Logicmaster 90-30/20/Micro software supports two forms of the JUMP function, a non-nested
form (JUMP) and a nested form (JUMPN).
12-31
LABEL and
LABELN
Specifies the target location of a JUMP instruction. Logicmaster 90-30/20/Micro software supports two
forms of the LABEL function, a non-nested form (LABEL) and a nested form (LABELN).
12-33
COMMENT
Places a comment (rung explanation) in the program. After programming the instruction, the text can
be typed in by “zooming” into the instruction (use F10 key to zoom).
12-34
Requests a special PLC service. (See list of service requests on page 12-35.)
12-35
Provides two PID (proportional/integral/derivative) closed-loop control algorithms:
•
Standard ISA PID algorithm (PIDISA).
•
Independent term algorithm (PIDIND).
12-70
MCR
and
MCRN
ENDMCR
and
ENDMCRN
JUMP
and
JUMPN
SVCREQ
PID
GFK-0467M
12-1
12
CALL
Use the CALL function to cause program execution to go to a specified subroutine block.
————————————————
|
|
-| CALL ???????
||
|
| (SUBROUTINE)
|
|
|
————————————————
When the CALL function receives power flow, it causes the scan to go immediately to the
designated subroutine block and execute it. After the subroutine block execution is complete,
control returns to the rung in the logic immediately following the CALL instruction.
Example
In the following example, the CALL instruction is programmed to call the subroutine named
ROTATE when contact %I0006 is on. (Note that before you can enter a subroutine name in a
CALL instruction, the subroutine name must already exist in the Block Declarations table.) By
positioning the cursor within the CALL instruction, you can press F10 to zoom into the subroutine
to view the subroutine logic. Once a subroutine is called, program execution will branch to the
subroutine, which will execute to completion, then pass program execution over to the rung
following the calling rung. In the example below, the subroutine is called from the second rung, so
when the subroutine finishes executing, the program scan will resume with the third rung.
|
|%I0004
%T0001
|——| |—————————————————————————————————————————————————————————————————————( )—
|
|
————————————————
|
|
|
|%I0006
| CALL ROTATE
||——| |———————| (SUBROUTINE)
|
|
|
|
|
|
|
|
————————————————
|
|%I0003 %I0010
%Q0010
|——| |——+——| |—————————————————————————————————————————————————————————————( )—
|
|
|%I0001 |
|——| |——+
|
Note
Micro PLCs do not accommodate subroutines; therefore, the CALL function is
inappropriate for use with a Micro PLC.
12-2
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
12
DOIO
The DO I/O (DOIO) function is used to update specified inputs or outputs for one scan while the
program is running. The DOIO function can also be used to update selected I/O during the program
in addition to the normal I/O scan. Under normal circumstances, the input tables are updated
during the input scan portion of the PLC sweep and will not be updated again until the next sweep.
The output tables are updated during the logic solution portion of the PLC sweep, but the output
modules are not updated until the logic solution portion is finished. With the DO I/O function,
updates of the input tables and output modules can be forced during the logic solution portion of
the scan. This capability allows you to read input changes and write to outputs more quickly than
is possible with the normal PLC scan. Refer to Chapter 2 for more information about the PLC
sweep.
If input references are specified, the function allows the most recent values of inputs to be obtained
(written to the input tables) for program logic. If output references are specified, DO I/O updates
output modules based on the most current values stored in I/O memory. I/O is serviced in
increments of entire I/O modules; the PLC adjusts the references, if necessary, while the function
executes.
Use with Input Modules
The DOIO function has four input parameters and one output parameter. When the function
receives power flow and input references are specified, the input points at the starting reference
(ST) and ending at END are scanned. If a reference is specified for ALT, a copy of the new input
values is placed in memory, beginning at that reference, and the applicable input table is not
updated. ALT must be the same size as the reference type scanned. If a discrete reference is used
for ST and END, then ALT must also be discrete. If no reference is specified for ALT, the
applicable input table is updated.
Use with Output Modules
When the DOIO function receives power flow and output references are specified, the output points
at the starting reference (ST) and ending at END are written to the output modules. If outputs
should be written to the output modules from internal memory, other than %Q or %AQ, the
beginning reference can be specified for ALT. The range of outputs written to the output modules
is specified by the starting reference (ST) and the ending reference (END).
Execution of the function continues until either all inputs in the selected range have reported, or all
outputs have been serviced on the I/O modules. Program execution then returns to the next function
following the DO I/O.
Use with Option Modules
If the range of references includes an option module (HSC, APM, etc.), then all of the input data
(%I and %AI) or all of the output data (%Q and %AQ) for that module will be scanned. The ALT
parameter is ignored while scanning option modules. Also, if it is desired to use the DOIO with an
Enhanced GCM module (IC693CMM302), the requirement in the following note must be met.
Note
The DOIO function can only be used with an Enhanced GCM module
(IC693CMM302) in systems with Release 9.0 and later CPUs.
GFK-0467M
Chapter 12 Control Functions
12-3
12
The function passes power to the right whenever power is received, unless:
•
Not all references of the type specified are present within the selected range.
•
The CPU is not able to properly handle the temporary list of I/O created by the function.
•
The range specified includes I/O modules that are associated with a “Loss of I/O” fault.
_____
|
|
(enable) —|DO_IO|— (ok)
|
|
|
|
|
|
(starting address) —|ST
|
|
|
|
|
(ending address) -|END |
|
|
|
|
—|ALT |
|_____|
Parameters
Parameter
Description
enable
When the enable input is on, a limited input or output scan is performed.
ST
ST is the starting address of a group of input or output points or words to be serviced.
END
END is the ending address of the group of input or output points or words to be serviced.
ALT
For the input scan, ALT specifies the address to store scanned input point/word values.
For the output scan, ALT specifies the address to get output point/word values from to
send to the I/O modules. For Model 331 and later CPUs, the ALT parameter can have an
effect on speed of DOIO function block execution (see Note below and the section on
the enhanced DO I/O function for 331 and later CPUs later in this chapter). If the ALT
function is not used, this input should be left blank; if a constant value of 0 is
programmed for ALT, the CPU may experience Watchdog Timeout Errors.
ok
The ok output is energized when the input or output scan completes normally.
Note
An Enhanced DOIO function is available for Model 331 and later CPUs. In the Enhanced DOIO,
the ALT parameter can be used to enter the slot number of a single discrete input or output module
in the main rack. This Enhanced DOIO function will execute in 80 microseconds instead of the 236
microseconds required when the DOIO is programmed without the ALT parameter. No error
checking is performed to prevent overlapping reference addresses or module type mismatches. See
the “Enhanced DO I/O Function” section later in this chapter for details.
Valid Memory Types
Parameter
flow
enable
ST
END
•
ALT
ok
•
12-4
%I
%Q
•
•
•
•
•
•
%M
•
%T
%S
•
%G
•
%R
•
%AI
%AQ
•
•
•
•
•
•
•
const
none
•
•
Valid reference or place where power can flow through the function.
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
12
Input Example 1
In the following example, when enabling input %M0001 turns ON, references %I0001 (specified at
ST) through %I0064 (specified at END) are scanned and %Q0001 is turned on. A copy of the
scanned inputs is placed in internal memory from reference %M0001 (specified at ALT) through
%M0064. Because an alternate location was specified at ALT, the %I input table is not updated by
the DO_IO. This form of the function can be used to compare the current values of input points
with their previous values (i.e. their values at the beginning of the logic solution scan).
|
|
_____
|%M0001 |
|
%Q0001
|——| |———|DO_IO|—————————————————————————————————————————————————————————( )|
|
|
|
|
|
|%I0001 -|ST
|
|
|
|
|
|
|
|%I0064 -|END |
|
|
|
|
|
|
|%M0001 —|ALT |
|
|_____|
|
Input Example 2
In the following example, when enabling input %M0001 is ON, references %I0001 (specified at
ST) through %I0064 (specified at END) are scanned and %Q0001 is turned on. Since no alternate
memory location is specified at ALT, the scanned input values are used by the DO_IO to update
the input table from reference %I0001 to %I0064. This form of the function allows input points to
be scanned and updated one or more times during the logic solution portion of the CPU sweep.
Note that when the ALT input is not used, it should be left blank as shown. Do not place a zero on
the ALT input because that will cause Watchdog Timer faults.
|
|
_____
|%M0001 |
|
%Q0001
|——| |———|DO_IO|—————————————————————————————————————————————————————————( )|
|
|
|
|
|
|%I0001 -|ST
|
|
|
|
|
|
|
|%I0064 -|END |
|
|
|
|
|
|
|
—|ALT |
|
|_____|
|
GFK-0467M
Chapter 12 Control Functions
12-5
12
Output Example 1
In the following example, when enabling input %M0001 is ON, the values of analog output
channels %AQ001 (specified at ST) through %AQ004 (specified at END) are written to references
%R0001 (specified at ALT) through %R0004 respectively, and %Q0001 is turned on. Because the
%R0001 alternate location was specified at ALT, the values at %AQ001 through %AQ004 are not
written to the analog output modules by the DO_IO.
|
|
_____
|%M0001 |
|
%Q0001
|——| |———|DO_IO|—————————————————————————————————————————————————————————( )|
|
|
|
|
|
|%AQ001 -|ST
|
|
|
|
|
|
|
|%AQ004 -|END |
|
|
|
|
|
|
|%R0001 —|ALT |
|
|_____|
|
Output Example 2
In the following example, when the enabling input %M0001 is ON, the values at references
%AQ001 through %AQ004 are written to analog output channels %AQ001 through %AQ004 on
the applicable analog output modules, and %Q0001 is turned on. The DO_IO updates the analog
output modules because no alternate memory location is specified at ALT. Note that when the
ALT input is not used, it should be left blank as shown. Do not place a zero on the ALT input
because that will cause Watchdog Timer faults.
|
|
_____
|%M0001 |
|
%Q0001
|——| |———|DO_IO|—————————————————————————————————————————————————————————( )|
|
|
|
|
|
|%AQ001 -|ST
|
|
|
|
|
|
|
|%AQ004 -|END |
|
|
|
|
|
|
|
—|ALT |
|
|_____|
|
12-6
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
12
Enhanced DO I/O Function for 331 and Later CPUs
Caution
Programs containing an Enhanced DO I/O should not be loaded by a version
of Logicmaster 90-30/20 software earlier than 4.01.
An enhanced version of the DO I/O (DOIO) function is available for Release 4.20 or later, of
Models 331 and later CPUs. This enhanced version of the DOIO function can only be used on a
single discrete input or discrete output 8-point, 16-point, or 32-point module.
The ALT parameter identifies the slot in the main rack of the target module. For example, a
constant value of 2 at ALT indicates that the module in slot 2 is targeted. The ST and END
parameters set the range of memory to be acted upon.
Note
The only checking associated with the enhanced DOIO function block is a basic
check of the target module’s condition.
The enhanced DOIO function only applies to modules located in a modular CPU rack. Therefore,
the ALT parameter must be between 2 and 5 for a 5-slot rack or 2 and 10 for a 10-slot rack.
The start (ST) and end (END) references must be either %I or %Q. These references specify the
first and last reference the module is configured for. For example, if a 16-point input module is
configured at %I0001 through %I0016 in slot 7 of a 10-slot main (CPU) rack, the ST parameter
must be %I0001, the END parameter must be %I0016, and the ALT parameter must be 10, as
shown below:
|
|
_____
|%M0001 |
|
%Q0001
|——| |———|DO_IO|———————————————————————————————————————————————————————————( )|
|
|
|
|
|
|%I0001 -|ST
|
|
|
|
|
|
|
|%I0016 -|END |
|
|
|
|
|
|
|
7 —|ALT |
|
|_____|
|
The following table compares the execution times of a normal DOIO function block for an 8-point,
16-point, or 32-point discrete input/output module with those of an enhanced DOIO function block.
Normal DOIO
Execution Time
Enhanced DOIO
Execution Time
8-Pt Discrete Input Module
8-Pt Discrete Output Module
224 microseconds
208 microseconds
67 microseconds
48 microseconds
16-Pt Discrete Input Module
16-Pt Discrete Output Module
224 microseconds
211 microseconds
68 microseconds
47 microseconds
32-Pt Discrete Input Module
32-Pt Discrete Output Module
247 microseconds
226 microseconds
91 microseconds
50 microseconds
Module
GFK-0467M
Chapter 12 Control Functions
12-7
12
SER (Sequential Event Recorder)
Requires CPUs 35x or 36x with Firmware 9.00 or later, or CPU37x
•
The SER (Sequential Event Recorder) function block collects a series of discrete samples (it
only works with discrete data). An SER function block collects up to 32 contiguous or noncontiguous bits per sample when the Enable input receives power flow.
•
Each SER can capture up to 1024 samples, with up to 32 bits per sample.
•
If the SER function block is embedded in a periodic subroutine, sampling rate is based on the
periodic subroutine execution rate.
•
Only the trigger sample is time stamped. The trigger sample can be time-stamped in BCD
(maximum resolution is 1second) or POSIX format (maximum resolution is 10ms). The time
stamp is only placed once at the trigger point. The SER does not support more than one time
stamp per recording.
•
The SER can be configured for pre-, mid-, or post-trigger modes. (See page 12-14.)
•
SER operation is configured by a function control block that you can create using a series of
Block Move (BLKMV) commands. (See page 12-10.)
•
An input module may be optionally specified that will be scanned each time the SER executes.
This helps ensure that the data captured from the specified module is as up-to-date as possible.
Note
PLC-to-PLC synchronization is not supported.
The SER function block has one output and three inputs: enable, reset (R), and trigger (T).
|
_____
|%T0003 |
|
%M0003
|——| |———| SER_|——————————————————————————————————————————————————————————( )—
|
|
|
|
|
|
|%T0001 |
|
|——| |———|R
|
|
|
|
|%T0002 |
|
|——| |———|T
|
|
|_____|
|
|
%R0100
As shown below, 8, 16, 24, or 32 channels may be configured, with each channel
representing a discrete point. Also, up to 1024 samples may be specified.
Channels (up to 32 bits)
32
1
1
xxxxxxxx
1024
12-8
xxxxxxxx
xxxxxxxx
2
3
xxxxxxxx
.
.
.
xxxxxxxx
xxxxxxxx
xxxxxxxx
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
xxxxxxxx
GFK-0467M
12
Parameters
Parameter
Description
enable
Whenever the function is enabled and the reset input is off, the SER function block
collects one sample from all configured channels.
When the reset input receives power flow, the SER function is reset regardless of the
state of the enable input. Sample Buffer, Trigger Sample Offset, Trigger Time, and
Current Sample Offset are all cleared to zero. The function block remains in the reset
state until power flow is removed from the reset input. The OK output is turned off while
in the reset state. When the power flow is removed from the reset input, sampling
resumes.
If the Trigger Input mode is selected and the function block is enabled, when the trigger
input goes on, the SER to transition to the triggered state. The Trigger Time, Trigger
Sample Offset, and a data sample are recorded.
The trigger sample will be recorded regardless of the number of samples taken. Once
triggered, the event recorder continues sampling until the Number of Samples After
Trigger is satisfied, at which time it stops collecting samples until power flow is seen on
the reset input.
If Trigger Mode is set to Full Buffer, the trigger signal is ignored.
For information on configuring Trigger Mode, see “Function Control Block” on page
12-10.
The 78-word function control block array begins at this reference. The function control
block defines function block execution, sample configuration, and operation parameters.
For details, see “Function Control Bloc” on page 12-10
The ok output is energized when the trigger conditions are satisfied (specified by the
Trigger Mode parameter), and all sampling is complete. The output continues to receive
power flow regardless of the state of the enable input until the reset receives power flow.
R
T
Starting
Reference
ok
Valid Memory Types
Parameter
flow
enable
•
%I
%Q
%M
%T
%S
Control Block
•
GFK-0467M
%G
%R
%AI
%AQ
const
none
•
R
•
T
•
ok
•
•
Valid reference or place where power can flow through the function.
Chapter 12 Control Functions
12-9
12
Function Control Block
The function control block is a 78-word array that defines information about the data capture and
trigger mechanism for the SER function. In a particular program, only one Sequential Event
Recorder function block can be associated with each function command block and data block.
Perform the following steps to configure parameters for the SER function block:
1.
Set up the stored values for the array as defined in the table below. You can use block moves
to initialize the registers, or initialize the data in the register table and store the table before
activating the SER function.
2.
Add the SER function block to your ladder logic.
Note
If you require x channels where x is not equal to 8, 16, 24, but is less than 32, you
must select a number of channels which is greater than x and a multiple of 8, and
fill in a null channel description for the unused channels. A null channel
description has a segment selector of 0xFFh, a length parameter equal to the
number of unused channels, and a 0 offset.
Word
12-10
Parameter
Description
0
(starting
reference)
Status
Read only variable that indicates the current state of the SER function block. Additional
information is provided in Status Extra Data, (Word 1). Note: If an error is detected in the
Control Block, the status will be set to 6, the OK output will be cleared, and no action will
occur. Settings for Status include:
0 = Reset
1 = Inactive
2 = Active
3 = Triggered
4 = Complete
5 = Overrun Error
6 = Parameter error
1
Status Extra Data
A read-only variable that provides additional state information about the SER function. See
“Status Extra Data States” on page 12-12 for settings for this parameter.
2
Trigger Mode
Defines conditions for the SER function block to transition to the triggered state. Valid
settings are:
0 = Trigger Input mode
1 = Full Buffer mode
In Trigger Input mode, if the function block is enabled, a time stamp is generated when the
Trigger signal is activated. Sampling continues until the Number of Samples After Trigger
value has been satisfied. When this occurs, the OK output is activated.
In Full Buffer mode, the Trigger signal is ignored. When the function block is enabled,
sampling continues until the sample buffer is filled. When this happens the OK output is
activated. The Number of Samples parameter sets buffer size.
3
Trigger Time
Format
Determines how the Trigger Time will be displayed. For BCD display, set this parameter to
0. For POSIX display, set this parameter to 1. (For details, see page 12-17.)
4—7
Reserved
Words 4 through 7 are reserved and should be set to zero.
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
12
Word
Parameter
Description
8
Number of
Channels (bits per
sample)
Specifies the number of bits of data that will be sampled and copied to the sample buffer for
each execution of the function block. Valid choices are 8, 16, 24, or 32 bits. Any unused
channels must be configured with a null channel description. (See Words 14—77.) For
example, if 19 bits are needed, you must configure 24 and specify that the last five are null.
9
Number of
Samples
Specifies the sample buffer size. Valid choices are 1 to 1024 samples. (Actual buffer size in
bits is Number of Samples times Number of Channels.)
10
Number of
Samples After
Trigger
Specifies the number of samples that are collected after the trigger condition becomes true.
This parameter can be set to a value between 0 and the Number of Samples. This parameter
is valid only when the Trigger Mode is set to zero (Trigger Input).
11
Input Module
Slot
Specifies the location in the main rack (Rack 0) of an input module that will be scanned
each time the SER executes. If the value is 0, no module is scanned. When an input module
is scanned, its values are stored locally and the values of the reference addresses configured
for the module are not affected. To store values from the scanned input module into the data
block sample buffer, a channel description must be provided. If the module is not present or
is faulted at the time of the scan, the data returned will be zero. A fault will not be logged in
the fault table if this occurs; fault indication will be left to the IO scanner.
12
Data Block
Segment Selector
(Memory Type)
Specifies the data type allocated for the Data Block. For example, if you wanted use the %R
memory type, you would enter 08 for this parameter. Valid settings for this parameter
include: %R (08h), %AI (0Ah), %AQ (0Ch). For details on the data block, see page 12-13.
13
Data Block Offset
Specifies the starting reference for the Data Block. This parameter is zero based. For
example, if you wanted to begin at %R0100, you would enter 99 for this parameter. Be sure
to allow enough memory for the entire data block.
14—77
Channel
Descriptions
Specifies the reference location (Segment Selector, Length and Offset) associated with a
particular channel. There can be from 1 to 32 channel descriptions, depending upon the
number of channels being sampled and data length. Data is returned in the order defined in
this section.
Channel Segment
Selector/Length
Entered as a hexadecimal value, this word defines the segment selector and data length (in
bits). MSB = Segment Selector. LSB = Data Length. The data length is useful for samples
that are contiguous.
The Segment Selector can be set to any discrete data type: %I (46h), %Q (48h), %M (4Ch),
%T (4Ah), %G (56h), %S (54h), %SA (4Eh), %SB (50h), %SC (52h), Null Selector (FFh),
and Input Module Selector (00h).
The length parameter can range from 1—32, but the sum of all of the lengths must not be
greater than the Number of Channels parameter. A length greater than 1 allows multiple
contiguous channels to be configured with a single channel description.
Channel Offset
GFK-0467M
Entered as a hexadecimal value, this word defines the BIT offset for the data type or input
module specified in the Segment Selector. This offset is zero-based. The range for this
parameter varies, depending on the Segment Selector (data type and length). The offset
indicates the location within the data table or input module at which to sample.
Chapter 12 Control Functions
12-11
12
Status Extra Data States
The Status Extra Data (Word 1 in the function control block) provides additional state information
for the SER function.
Value
12-12
State
Description
0
Reset State
The Reset input is receiving power flow. Sample Buffer, Trigger Sample Offset, Trigger
Time, and Current Sample Offset are all cleared to zero. The output is held to no power flow.
Transition to the Inactive State occurs when the reset power flow is removed. Status Extra
Data has no significance and will be cleared to zero.
1
Inactive
State between the Reset State and the Active State. No actions are performed in this state.
The SER output is held to no power flow. Transition to the Active State occurs when the
function block receives enable power flow.
2
Active
The Enable input has received power flow, but the function block is not reset, in error, or
triggered. One sample is recorded for each execution when the function block is enabled. The
output is held to no power flow. The Trigger condition (specified by the Trigger Mode
parameter) is monitored and will cause transition to the Triggered State if conditions are true.
If more than the “Number of Samples” have been taken, Status Extra Data will be set to
0x01, otherwise it will be 0x00.
3
Triggered
State if the trigger condition defined by Trigger Mode is true. Additional Samples are taken
depending upon the trigger mode and parameter settings. The output is held to no power
flow. Transition to the Complete state will occur when all sampling is complete. If more than
the “Number of Samples” have been taken, Status Extra Data will be set to 0x01, otherwise it
will be 0x00.
4
Complete
All sampling is complete. The output receives power flow. Only transition to the Reset State
is allowed. If more than the “Number of Samples” have been taken then Status Extra Data
will be set to 0x01, otherwise it will be 0x00.
5
Overrun Error
The Control/Data Block has exceeded the end of its memory type. The output is held to no
power flow. Only transition to the Reset State is allowed. Status Extra Data has no
significance and will be cleared to zero.
6
Parameter Error
There is an error in the function control block or other operation parameters. The output is
held to no power flow. Only transition to the Reset State is allowed. The Status Extra Data
word contains the offset into the control block at which the parameter error occurred.
7
Status Error
The Status Parameter is invalid. The output is held to no power flow. Only transition to the
Reset State is allowed. The invalid status value will be stored in the Status Extra Data
location in the Control Block.
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
12
SER Data Block Format
The SER Data Block contains the sample buffer, sample offsets, and trigger information. This
information is supplied by the CPU and you should only read from this data area. It is your
responsibility to allocate enough register space for the Data Block. The block format is as follows:
Word*
Parameter Description
0
Current sample offset number. References the location where the most recent sample was
placed. The parameter is zero-based. Valid ranges are –1 to 1023.
Register Location of Sample = (Num Bytes per Sample) * (Offset Parameter)/2 + (Sample
Buffer Starting Register).
Note: This value is not valid until a sample is taken. This value is set to –1 when the SER
function is reset through the Reset input.
1
Trigger sample offset number. References the storage location of the sample obtained when
the trigger condition transitioned to the True state. The parameter is zero-based. Valid ranges
are 0 to 1023.
Register Location of Sample = (Num Bytes per Sample) * (Offset Parameter)/2 + (Sample
Buffer Starting Register).
Note: This value is not valid until the trigger condition is met. This value is set to 0 when the
SER function is reset (through the reset input).
2 through 5
Trigger Time: Indicates the time, according to the Time of Day clock within the PLC, that
the trigger condition transitioned to the true state within the function block. The time value
can be displayed in BCD format (default) or POSIX format. The format is determined by the
Trigger Time Format parameter in the Control Block. This value is initialized to zero upon
activation of the reset input.
6 to end of
sample buffer.
Sample Buffer. The area of memory that holds the data samples. This area is set to zero
when the reset parameter is energized. The sample buffer size varies, depending on the
number of channels and sample size. The sample buffer is a circular buffer – when the last
location is written, the next sample will overwrite the sample in the first register.
End of sample buffer =
5 + ({[(# of samples to be taken) * (# of channels to be sampled / 8)] +1} / 2
*Offset from starting reference defined by Data Block Segment Selector (Word 12) and Data Block
Offset (Word 13) in Function Control Block.
SER Operation
If the SER is enabled when scanned, it reads the configured sample points and puts them in a
circular list. After the configured number of samples is taken, the output is turned on. The
transition of the output can be used to record the time that the last sample is taken or to initiate
additional sampling. (See “Sampling Modes.”)
The SER function block must be reset (enable the Reset input power flow) before sampling is
started. Resetting initializes the data block area. If the function block status is not reset, it will
execute with the current values in the data block, causing the current sample offset to be incorrect
and invalid data in the data block.
The Control Block of the SER function block is scanned every time the function block is executed
in the Reset, Active, or Triggered State. If you change a configuration parameter in the Control
Block during program execution, the change takes effect the next time the SER function block
associated with that Control Block is scanned. If an error is encountered, operation stops and the
GFK-0467M
Chapter 12 Control Functions
12-13
12
function block goes to the appropriate error state. You must correct the error and then reset the
function block (enable the Reset input power flow) to begin sampling again.
If you select an input module to be scanned the PLC will not verify that the module is a Discrete
Input Module, or that Channel Descriptions associated with the module have valid lengths and
offsets based upon the module size. You must correctly set up the sampling of an Input Module.
Although multiple channel descriptions can target an input module, the module is still only scanned
once per function block execution.
The SER function block can be placed in the normal user logic program or within a periodic
subroutine. If placed in the user logic program, the resolution of the interval between scans is the
resolution of the scan time, which can vary depending on the number and types of functions active
on any particular scan. If placed in an interrupt subroutine, the interval can be set to as little as 1ms,
and the resolution will be highly repeatable at 1ms with little jitter.
Execution time of one function block with a 1ms periodic subroutine can consume up to 50% of the
CPU's resources. You should not plan on execution of more than two SER functions within a 1ms
periodic subroutine.
Sampling Modes
The SER sampling mode is determined by the Trigger Mode (Word 2 in the Function Control
Block) and Number of Samples After Trigger (Word 10) parameters. You will need to interpret the
contents of the sample buffer based on how you configured these parameters.
The following table summarizes how the sampling modes are determined.
Mode
Word 2
Word 10
Pre-Trigger
0
0
Mid-Trigger
0
From 1 to (Number of Samples – 1)
Post-Trigger
0
equal to Number of Samples (specified in Word 9)
Full Buffer
1
Word 10 and trigger input signal are ignored
Trigger-Controlled Sampling
In order to configure pre-, mid-, and post-trigger sampling modes, Trigger Mode (Word 2 = 0)
must be selected. The sampling mode is controlled by the Number of Samples After Trigger value
(Word 10). In all cases, sampling starts when the Enable signal goes high. When the Trigger signal
goes high, sampling continues until the number specified in the Number of Samples After Trigger
parameter is collected. The SER’s OK Output signal goes high when sampling is completed.
If more than the configured Number of Samples (Word 9) is collected before the Number of
Samples After Trigger condition is satisfied, the buffer “wraps around,” meaning that the SER
returns to the beginning of the buffer and overwrites the initial samples.
When the trigger first transitions from off to on, the trigger time is placed in a configured location.
Pre-Trigger
Collects samples continuously until trigger is detected.
To configure this mode, set Word 10 to a value of 0, so that when the trigger signal is activated,
sampling stops and a time stamp is generated. (All samples are collected before the trigger.)
12-14
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
12
Enable - sampling starts
Sample 1
Sample 513
Sample 2
Sample 514
Sample 3
Sample 515
Sample 4
Sample 516
When buffer is filled,
new samples overwrite
initial samples.
Trigger - SER stops sampling
and generates time stamp
(Number of Samples After
Trigger = 0)
Sample 506
Sample 1018
Sample 507
Sample 1019
Sample 508
Sample 1020
Sample 509
Sample 510
Sample 511
End of buffer
(Number of Samples)
Sample 512
Figure 12-1. Example of Pre-Trigger SER Sampling (for 512 Samples)
Mid-Trigger
Collects samples continuously until Number of Samples After Trigger has been collected.
To configure this mode, set Word 10 to a value between 1 and the (Number of Samples – 1). When
the trigger signal is activated, sampling continues until the configured number has been collected.
In the following example, Number of Samples After Trigger is 12. When sampling is complete, the
buffer will contain 500 pre-trigger samples and 12 post-trigger samples.
Enable - sampling starts
Sampling stops when
Number of Samples After
Trigger is satisfied (12)
Sample 1
Sample 513
Sample 2
Sample 514
Sample 3
Sample 515
Sample 516
Sample 4
Sample 5
Sample 517
Sample 6
When buffer is filled,
new samples overwrite
initial samples.
Trigger - SER generates time
stamp and continues sampling
End of buffer
(Number of Samples)
Sample 506
Sample 507
Sample 508
Sample 509
Sample 510
Sample 511
Sample 512
Figure 12-2. Example of Mid-Trigger SER Sampling (for 512 Samples)
GFK-0467M
Chapter 12 Control Functions
12-15
12
Post-Trigger
Collects sample continuously until Number of Samples is reached.
To configure this mode, set Word 10 to a value equal to the Number of Samples (Word 9). When
the trigger signal is activated, sampling continues until the configured number has been collected.
(Note: all samples are collected after the trigger.)
Enable - sampling starts
Trigger - SER generates time
stamp and continues sampling
(Number of Samples After
Trigger = 512, same as
Number of Samples parameter)
Sampling stops when
Number of Samples
After Trigger is satisfied
Sample 1
Sample 2
Sample 513
Sample 514
Sample 3
Sample 515
When buffer is filled,
new samples overwrite
initial samples.
Sample 505 Sample 1017
Sample 506
Sample 507
Sample 508
Sample 509
Sample 510
Sample 511
End of buffer
(Number of Samples)
Sample 512
Figure 12-3. Post-Trigger SER Sampling (for 512 samples)
Full Buffer (Trigger Does Not Control Sampling)
If the Trigger Mode is set to 1, the Number of Samples After Trigger parameter (Word 10) is
ignored and the Trigger input signal has no effect on function block operation. When the function
block is enabled, sampling continues until the Number of Samples (Word 9) is collected, filling the
sample buffer. When the buffer is full, sampling stops, a Trigger time stamp is generated, and the
function block OK output goes high.
12-16
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
12
SER Function Block Trigger Timestamp Formats
Data Block
Word No.
Word 2
Word 3
Word 4
Word 5
BCD Format
Contents
(High Byte/Low Byte)
Month/Year
Hours/Day of Month
Seconds/Minutes
Not Used
Suggested
Viewing Format
Hex. (MMYY)
Hex. (HHDD)
Hex. (SSMM)
All zeros
POSIX Format
Data Block
Word No.
Contents
Suggested
Viewing format
Words 2 and 3
Number of Seconds Since
January 1, 1970
Dint
Words 4 and 5
Number of Nano-Seconds
into next Second
Dint
Example
The next two tables show how the trigger time of November 3, 1998 at 8:34:05.010 a.m. would
appear in BCD and in POSIX formats in a data block that starts at %R0201 (Word 0).
November 3, 1998 at 8:34:05.010 a. m. in BCD Format
Register
Parameter
Value (hex)
%R0203
Month/Year
1198
%R0204
Hours/Day of Month
0803
%R0205
Seconds/Minutes
0534
%R0206
Unused
0000
November 3, 1998 at 8:34:05.010 a. m. in POSIX Format
GFK-0467M
Register
Parameter
Value (decimal)
Value (hex)
%R0203/R0204
Seconds
910,082,045
363EBFFD
%R0205/R0206
Nano-seconds
010,000,000
00989680
Chapter 12 Control Functions
12-17
12
SER Example
The following shows the interrelationships, of the ladder logic instruction, the control block in PLC
memory, and the affected Input module in the PLC. The control block has been set up as described
in Table 12-1.
%M0100
%I0016
SER
%M0002
R
%M0050
T
Series 90-30 PLC, Rack 0
Power CPU
Supply
%R0100
Slot Number:
1
2
3
4
5
6
7
8
9
10
Control Block
Word # Address Value
Description
0
%R0100
0
Status word
1
%R0101
0
Status extra data
2
%R0102
0
Trigger mode (0 = Trigger input)
3
%R0103
0
Trigger time format (0 = BCD)
4
%R0104
0
Reserved
5
%R0105
0
Reserved
6
%R0106
0
Reserved
7
%R0107
0
Reserved
8
%R0108
24
Bits per channel
9
%R0109
512
Sample buffer size
10
%R0110
12
Number of samples after trigger
11
%R0111
4
Specifies the input module in slot 4
12
%R0112
8
Data block memory type (%R)
13
%R0113
200
Data block memory offset (201)
14
%R0104
%R0201
Channel Descriptions
Data Block
Word # Address Value
12-18
Description
0
%R0201
0
Current sample offset number
1
%R0202
0
Trigger sample offset number
2
%R0203
0
Month and year (MMYY)
3
%R0204
0
Hour and day (HHDD)
4
%R0205
0
Seconds and minutes (SSMM)
5
%R0206
0
Not used
6
%R0207
Sample Buffer (size specified by Control
Block Word 9)
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
12
Function Control Block Example
In this example, a 16-point discrete input module in rack 0, slot 4, has been specified (in Word 11)
as the target to sample. It has been executing long enough that 572 samples (512 + 60) have been
taken. The Enable input is receiving power flow, but the Reset and Trigger inputs are not.
Table 12-1. Function Control Block for SER Example
Word
Register
Parameter
Value
(dec)
Value
(hex)
0
%R0100
1
Description
Status
2
0002
Function block is in the Active state. This
means the function block is executing
normally, and taking a sample each time the
function block is encountered in program
logic.
%R0101
Status Extra Data
1
0001
The extra status data indicates that more that
512 samples have been taken and thus the
sample buffer has already wrapped at least
once.
2
%R0102
Trigger mode
0
0000
The event recorder is configured to trigger
based on the Trigger input.
3
%R0103
Trigger Time Format
0
0000
0=BCD
4
%R0104
Reserved
0
0000
The Reserved parameters are always set to 0.
5
%R0105
Reserved
0
0000
6
%R0106
Reserved
0
0000
7
%R0107
Reserved
0
0000
8
%R0108
# of channels
24
0018
Each sample consists of 24 bits (3 bytes) of
data.
9
%R0109
# of samples to be taken
512
0200
Sample buffer size is 512 samples. Note that
the sample buffer equals 512 x (24/8) = 1536
bytes or 768 words. (Each sample is 3 bytes
long as specified in Word 8 above.)
10
%R0110
# of samples after trigger
12
000C
The number of samples to be collected after
the trigger occurs is 12.
11
%R0111
Input module slot
4
0004
The input module in rack 0, slot 4 will be
scanned when the SER executes so that its
current values are available for sampling by
the SER.
12
%R0112
Data Block Segment Selector
13
%R0113
Data Block Offset
8
0008
The data segment is 0x08 (%R).
200
00C8
This offset of 200 places the start of the data
block at %R0201. The offset is a zero-based
value, but the register tables begin at %R0001.
Therefore, the data block starting point is
%R0001 + 200 = %R0201.
Continued on Next Page
GFK-0467M
Chapter 12 Control Functions
12-19
12
Word
Register
Channel Descriptions
Parameter
Value
(dec)
Value
(hex)
Description
The remaining words contain the channel descriptions. In this example six channel descriptions have been
defined.
14
%R0114
Set. Sel. : Length
17921
4601
15
%R0115
Offset
0
0000
16
%R0116
Seg. Sel. : Length
-253
FF03
17
%R0117
Offset
0
0000
18
%R0118
Seg. Sel. : Length
3
0003
19
%R0119
Offset
12
0012
20
%R0120
Seg. Sel. : Length
18434
4802
21
%R0121
Offset
8
0008
22
%R0122
Seg. Sel. : Length
8
0008
23
%R0123
Offset
0
0000
24
%R0124
Seg. Sel. : Length
-249
FF07
25
%R0125
Offset
0
0000
Channel description 1: The first channel
description selects the %I Segment with a
length of 1, and an offset of 0. This chooses
%I0001 for channel 1.
Channel description 2: The second channel
description selects the NULL Selector with
length of 3, and offset of 0. The NULL
selector causes channels 2 - 4 to be ignored or
“skipped.” These channels will always contain
a sample value of Zero.
Channel description 3: The third channel
description selects the Input Module Selector
with a length of 3 and offset of 12. The Input
Module Selector causes samples to be taken
from the input module. This channel
description chooses the values in points 13,
14, and 15 of the input module for channels 5 7.
Channel description 4: The fourth channel
description selects the %Q Segment with a
Length of 2, and offset of 8. This chooses
%Q0009 and %Q0010 for channels 8 and 9.
Channel description 5: The fifth channel
description is another Input Module Selector.
It has a length of 8, and offset of 0. This
causes the values for points 1 to 8 of the input
module to be placed in channels 10 - 17.
Channel description 6: The sixth channel
description is another NULL Selector. It has a
Length of 7, and offset of 0. This NULL
channel description causes channels 18 - 24 to
be filled with zeros. This last channel
description is required to pad the sample
buffer out to the 24 bits specified in the
number of channels parameter. Since all 24
channels are configured, no more channel
descriptions are needed.
Channel Configuration for Above Example
32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
U
U
U
U
U
U
U
U
N
N
N
N
N
N
9
8
7
6
5
4
3
2
1
N C8 C7 C6 C5 C4 C3 C2 C1 %Q %Q C15 C14 C13 N
10 09
N
N %I
01
U = Unused, N = Null, C prefix indicates channel number on configured Input module (for example, C0 = input point 1, C15 = input point 16)
12-20
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
12
Example Sample Contents
Table 12-2 summarizes the values contained in a single sample based upon the channel descriptions
in the sample control block. This is based on the example screen capture shown on the following
page. Note in this example that bits 1 – 16 are contained in %R00207 and bits 17 – 24 are part of
%R00208.
Table 12-2. Sample Contents for SER Example
Channel Number
Channel Contents
Value
1
%I0001
1
2-4
Zeros
000
5
Input Module Point 13
1
6
Input Module Point 14
1
7
Input Module Point 15
1
8
%Q0009
0
9
%Q0010
0
10 - 17
Input Module Points 1 - 8
100100010
18 - 24
Zeros
0000000
Data Block for Control Block Example
Table 12-3 lists the format of the data block resulting from the example control block given on
page 12-19. Note that it begins at register 201 as described by the segment offset parameters
(Words 12 and 13) in the control block.
Table 12-3. Data Block for SER Control Block Example
Offset
Register
0
%R0201
1
202
2-5
6 - 768
Parameter Description
Value (dec)
Value (hex)
Current sample offset #
59
003B
Trigger sample offset #
0
0000
203 – 206
Trigger time (BCD)
0
0
0
0
0000
0000
0000
0000
207 – 975
Sample Buffer
sample data
sample data
Current sample offset is 59, meaning that the 59th sample is the last sample placed in the sample
buffer. With 3 bytes per sample, the current offset is actually at 59 * 3 = 177 bytes or the high byte
of the 89th register. Since the trigger conditions have not been met, the trigger sample and trigger
time are 0 and the output is not set. The sample buffer contains 512 samples where 59 is the newest
sample and 60 is the oldest sample.
GFK-0467M
Chapter 12 Control Functions
12-21
12
Example Data Capture
Examining the Captured Data
The following screen snap was taken after a trigger. The Control Block starts at %R00100, and the
Data Area starts at %R00201. The cursor is positioned on %R00207 as noted near the top and
bottom of the screen.
%R00207 is the first register in the data block that actually holds the measured input data. Note
that its integer value (-21855) has little meaning in this context; however, by placing your cursor on
%R00207, its value is displayed in binary near the top of the screen. Using this binary format, you
can determine the states of the bits configured in the Channel Descriptions portion of the control
block.
Registers %R00203 through %R00205 give the time and date, in 24-hour format, as 16:06 (and 57
seconds) on May 15, 2001.
%R00207
Represented in
Binary
%R00207
First Actual
Data
Register
12-22
%R00205 %R00204
Seconds and Hour and
Minutes
Day
(SSMM) (HHDD)
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
%R00203 %R00202
Month and Trigger
Year
Sample
Offset
(MMYY)
Number
%R00201
Current
Sample
Offset
Number
GFK-0467M
12
END
The END function provides a temporary end of logic. The program executes from the first rung to
either the last rung or to the END function, whichever is encountered first.
The END function unconditionally terminates program execution. There can be nothing after the
end function in the rung. No logic beyond the END function is executed, and control is transferred
to the beginning of the program for the next sweep. Note that in rungs past the END marker, inputs
will appear to turn on and off, but outputs will not be updated. Although a normal condition, this
will appear to be a problem if it isn’t apparent that an END marker precedes the affected rungs.
The END function is useful for debugging purposes because it allows you to isolate a section of
logic. It does this by preventing any logic that follows it from being executed.
Logicmaster programming software provides, by default, an [ END OF PROGRAM LOGIC ]
marker after the last rung of logic to indicate the end of program execution. This marker is used if
no END function is programmed in the logic.
[ END ]
Example
In the following example, the rung containing contact %I0222 and coil %Q0017, and any rungs
after it, will not be executed because of the presence of the END instruction.
%M0101
%M0100
[ END ]
%Q0017
%I0222
Note
Placing an END function in SFC logic or in logic called by SFC logic produces
an “END Function Executed from SFC Action” fault in Release 7 or later CPUs.
(In pre-Release 7 CPUs, it did not work correctly, but no Fault was generated.)
For information about this fault, refer to the “System Configuration Mismatch”
part of Chapter 3, Section 2.
GFK-0467M
Chapter 12 Control Functions
12-23
12
MCRN/MCR
Overview of MCR and MCRN
A Master Control Relay (MCR/MCRN) function must be used with a corresponding End Master
Control Relay (ENDMCR/ENDMCRN) function. Both functions must have the same name. The
MCR/MCRN must have an enable contact between it and the power rail. All rungs between an
enabled MCR/MCRN and its corresponding ENDMCR/ENDMCRN function are executed without
power flow to coils. The ENDMCR/ENDMCRN function associated with the MCR/MCRN causes
normal program execution to resume. Unlike the JUMP instruction, an MCR/MCRN can only
occur in the forward direction. An ENDMCR/MCRN instruction must appear later in a program
than its corresponding MCR/MCRN instruction.
The following controls are imposed on logic controlled by an enabled MCR/MCRN:
•
Timers do not increment or decrement. Any TMR type timer is reset (accumulator is set to
zero). For an ONDTR timer, the accumulator is “frozen” at the value that was current when
the MCR/MCRN was enabled.
•
Power flow does not occur for any instruction. Normal outputs are off; negated outputs are on.
•
Instructions do not update their outputs. For example, an ADD instruction will not produce a
current sum in its Q output register, a Move will not copy its current input value to its output, a
Shift Register will not shift data, etc. The values in these output registers will be frozen at the
values that were present when the MCR/MCRN was enabled.
Note
When an MCR/MCRN is energized, the logic it controls is evaluated and contact
status is displayed, but no outputs are energized. If you are not aware that an
MCR/MCRN is controlling the logic being observed, this might appear to be a
faulty condition. To indicate that a range of ladder logic is under MCR/MCRN
control, Logicmaster displays a double power rail on the ladder logic screen.
This double power rail appears regardless of whether or not the MCR/MCRN is
enabled.
Logicmaster 90-30/20/Micro software supports two forms of the Master Control Relay function, an
older, non-nested (MCR) and a newer, nested form (MCRN).
12-24
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
12
CPU Compatibility
CPU Type
CPU311 – CPU341, Release 1
Supported Form
Use only the non-nested form (MCR)
CPU311 – CPU341, Release 2 and later
Use only the nested form (MCRN)
35x, 36x, and 37x series CPUs
Use only the nested form (MCRN)
Possible MCRN Compatibility Problem
When converting a CPU340 or CPU341 program to run in a 35x/36x/37x series CPU, it is possible
to see a “Feature not Supported” error (“Nesting Levels Exceeded”) from Logicmaster 90. This
would occur when the converted program is stored to a 35x/36x/37x CPU if more than eight levels
of MCRN nesting is used in the original program.
The MCRN instructions are actually function block instructions in the CPU340/341, which means
they are executed in CPU firmware and not executed by the embedded Boolean Coprocessor
(BCP). The nesting limit for the function block was set to 256. This limit is many more levels than
you would generally use. When the 35x/36x/37x CPU series was designed, the MCRN instructions
were moved to the BCP to improve CPU performance (function block instructions execute slower
than BCP counterparts). At that time a tradeoff of nesting levels and performance was made and
the BCP3 used in 35x/36x/37x CPUs implemented eight levels of nesting, which are normally
more than users require. So, Logicmaster 90 enforces eight levels of nesting when the program
conversion is performed, and if there are more than eight levels used, a “Nesting Levels Exceeded”
message is issued.
Therefore, if you have more than eight MCR nesting levels in a CPU340/341 program, it will
require a modification to work in a 35x/36x/37x CPU. You might consider using Jump statements
instead.
Nesting an MCRN
An MCRN function can be placed anywhere within a program, as long as it is properly nested with
respect to other MCRNs, and does not occur in the range of any non-nested MCR or non-nested
JUMP.
If an MCRN/ENDMCRN pair is nested within another MCRN/ENDMCRN pair, it must be
contained completely within the other pair. Up to eight levels of nesting are allowed. For an
example, see page 12-28.
There can be multiple MCRN functions corresponding to a single ENDMCRN (except for the
35x/36x/37x series CPUs as noted below). Each MCRN as well as the ENDMCRN must have the
same name. This is analogous to the nested JUMP, where you can have multiple JUMPs to the
same LABEL. For a comparison of the JUMP function and the MCR function, refer to the
“Differences Between MCRs and Jumps” section below.
Note
Use only one MCRN for each ENDMCRN with 35x, 36x and 37x series CPUs.
GFK-0467M
Chapter 12 Control Functions
12-25
12
MCR Operation
There can be only one MCR instruction for each ENDMCR instruction. The range for non-nested
MCRs and ENDMCRs cannot overlap or contain the range of any other MCR/ENDMCR pair or
any JUMP/LABEL pair of instructions. Non-nested MCRs cannot be within the scope of any
JUMP/LABEL pair.
Parameters
Both forms of the MCR function have the same parameters. They both have an enable Boolean
input EN and a name that identifies the MCR. This name is used again with an ENDMCR
instruction. Neither the MCR nor the MCRN function has any outputs; there can be nothing after
an MCR in a rung.
???????
[ MCR ]
*[
12-26
???????
or
-[
*[ MCRN]
MCRN]
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
12
Differences Between MCR/MCRN and JUMP
With an MCR function, function blocks within the scope of the MCRN are evaluated without
power flow, and coils are not energized. In the following example, when %M0150 is ON, the
MCRN is enabled. When the MCRN is enabled, even if %I004 is ON, the ADD function block is
evaluated without power flow (i.e., it does not add 100 to %R0001), and %M0210 does not receive
power flow. Status of contacts such as %I0004 and values in registers used on inputs, such as
%R0001, will update on the Logicmaster screen, but registers on outputs under control of the
MCRN, such as %R0010, will be frozen at their current values when the MCRN is enabled.
%M0150
OPTION
[ MCRN ]
%I0004
%M0210
ADD
INT
%R0001
+13069
I1
CONST
+00100
I2
Q
%R0010
+00878
OPTION
[ ENDMCRN ]
With a JUMP function, any function blocks between the JUMP and the LABEL are not evaluated,
and coils are not affected. In the following example, when %I0001 is ON, the JUMP named
TEST1 is enabled. Since the logic between the JUMP and the LABEL is skipped, %M0210 is
unaffected (i.e., if it was ON, it remains ON; if it was OFF, it remains OFF). Status of contacts
such as %M0004 and values in registers used on inputs, such as %R0001, will update on the
Logicmaster screen, but registers on outputs under control of the JUMP, such as %R0010, will be
frozen at their current values when the JUMP is enabled.
%I0001
N
%M0004
TEST1
%M0210
ADD
INT
%R0001
+13069
I1
CONST
+00100
I2
Q
%R0010
+00878
TEST1 :
GFK-0467M
Chapter 12 Control Functions
12-27
12
Example 1
The following example shows an MCRN named “Second” nested inside the MCRN named “First.”
Whenever %I0002 allows power flow into the MCRN function, program execution will continue
without power flow to the coils until the associated ENDMCRN is reached. If %I0001 and %I0003
are ON, %Q0001 is turned OFF and %Q0003 remains ON.
To aid in troubleshooting ladder programs, a double power rail identifies logic that is within the
control range of an MCR.
|
|%I0002
FIRST
|——| |———[ MCRN ]
|
||
||
||%I0004
SECOND
||——| |———[ MCRN ]
||
||
||
||%I0001
%Q0001
||——| |————————————————————————————————————————————————————————————————————( )—
||
||
||
||%I0003
%Q0003
||——| |————————————————————————————————————————————————————————————————————(S)—
||
||
|| SECOND
|+[
ENDMCRN
]
||
||
||
| FIRST
+[
ENDMCRN
]
|
12-28
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
12
Example 2
In the following example, the first rung is functioning normally. However, the MCRN named
SKIP is controlling the rest of the rungs, which have a double power bar to indicate this. In the
first rung controlled by the MCRN, the ONDTR timer’s accumulated value (%R0004) is frozen,
and even though it reached its preset value, its output (%M0200) is not energized. In the following
rung, the TMR has been reset by the MCRN. Its accumulated value (%R0007) is held at zero and
its output (%M02025) is not energized. In the next rung, the ADD instruction’s output is frozen
(its output at %R0010 is not the sum of its inputs) and its power flow coil (%M0210) is not
energized. Note, however, that the status of contacts and values of input registers (such as %R0001
on the ADD instruction I1 input) are updated on-screen within the MCRN control area.
%I0001
%M0100
ONDTR
0.10s
%M0001
R
CONST
+12000
PV
%R0001
+13069
%M0150
SKIP
[ MCRN ]
%I0002
%M0001
%M0200
ONDTR
0.10s
R
CONST
+12000
PV
%R0004
+12131
%I0003
%M0205
TMR
0.10s
%M0001
R
CONST
+12000
PV
%R0007
+00000
%I0004
%M0210
ADD
INT
%R0001
+13069
I1
CONST
+00100
I2
Q
%R0010
+00878
SKIP
[ ENDMCRN ]
GFK-0467M
Chapter 12 Control Functions
12-29
12
ENDMCRN/ENDMCR
Use the End Master Control Relay ENDMCR/ENDMCRN function to resume normal program
execution after an MCR/MCRN function. When the MCR associated with the ENDMCR is active,
the ENDMCR causes program execution to resume with normal power flow. When the MCR
associated with the ENDMCR is not active, the ENDMCR has no effect.
Logicmaster 90-30/20/Micro software supports two forms of the ENDMCR function, a non-nested
and a nested form. The non-nested form, ENDMCR, must be used with the non-nested MCR
function, MCR. The nested form, ENDMCR, must be used with the nested MCR function, MCRN.
The ENDMCR function has a negated Boolean input EN. The instruction enable must be provided
by the power rail; execution cannot be conditional. The ENDMCR function also has a name, which
identifies the ENDMCR and associates it with the corresponding MCR(s). The ENDMCR function
has no outputs; there can be nothing before or after an ENDMCR instruction in a rung.
???????
-[
ENDMCR
]
or
???????
-[
ENDMCRN
]
Example
In the following examples, an ENDMCR instruction is programmed to terminate the MCR named
“CLEAR.”
Example of a non-nested ENDMCR
|
| CLEAR
|
|-[
ENDMCR
|
]
Example of a nested ENDMCR:
|
| CLEAR
|
|-[
ENDMCRN
|
12-30
]
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
12
JUMP
Use the JUMP instruction to cause a portion of the program logic to be bypassed. Program
execution will continue at the LABEL specified. When the JUMP is active, all coils within its
scope are left at their previous states. This includes coils associated with timers, counters, latches,
and relays.
Logicmaster 90-30/20/Micro software supports two forms of the JUMP instruction, a non-nested
and a nested form. The non-nested form has been available since Release 1 firmware for the
CPU311-CPU341 CPUs, and has the form ——————>>LABEL01, where LABEL01 is the
name of the corresponding non-nested LABEL instruction.
For non-nested JUMPs, there can be only a single JUMP instruction for each LABEL instruction.
The JUMP can be either a forward or a backward JUMP.
The range for non-nested JUMPs and LABELs cannot overlap the range of any other
JUMP/LABEL pair or any MCR/ENDMCR pair of instructions. Non-nested JUMPs and their
corresponding LABELs cannot be within the scope of any other JUMP/LABEL pair or any
MCR/ENDMCR pair. In addition, an MCR/ENDMCR pair or another JUMP/LABEL pair cannot
be within the scope of a non-nested JUMP/LABEL pair.
Note
The non-nested form of the JUMP instruction is the only JUMP instruction that
can be used in a Release 1 Series 90-30 PLC. The nested JUMP function can be
used (and is suggested for use) for all new applications.
Also, please note that the 35x/36x/37x series CPUs support only nested jumps.
The nested form of the JUMP instruction has the form ———N——>>LABEL01, where
LABEL01 is the name of the JUMP and its corresponding nested LABEL instruction. The nested
JUMP is available in Release 2 and later releases of Logicmaster 90-30/20/Micro software and
PLC firmware.
A nested JUMP instruction can be placed anywhere within a program, as long as it does not occur
in the range of any non-nested MCR or non-nested JUMP.
There can be multiple nested JUMP instructions corresponding to a single nested LABEL. Nested
JUMPs can be either forward or backward JUMPs.
Both forms of the JUMP instruction are always placed in columns 9 and 10 of the current rung line;
there can be nothing after the JUMP instruction in the rung. Power flow jumps directly from the
instruction to the rung with the named label.
GFK-0467M
Chapter 12 Control Functions
12-31
12
Non-nested JUMP:
——————————————————————— —————————>> ???????
Nested JUMP:
——————————————————————— ———N—————>> ???????
Caution
To avoid creating an endless loop with backward JUMP instructions, a
backward JUMP must contain a way to make it conditional.
Examples
In the following example, whenever contact %I0001 turns on, the JUMP named TEST1 is enabled,
and power flow is jumped ahead to the TEST1 LABEL. Since the logic between the JUMP and the
LABEL is skipped, %M0210 is unaffected (i.e., if it was ON, it remains ON; if it was OFF, it
remains OFF). Status of contacts such as %M0004 and values in registers used on inputs, such as
%R0001, will update on the Logicmaster screen, but registers on outputs under control of the
JUMP, such as %R0010, will be frozen at their current values when the JUMP is enabled. Note the
use of the double power rail in the section of logic located between the JUMP and its LABEL.
%I0001
N
%M0004
TEST1
%M0210
ADD
INT
%R0001
+13069
I1
CONST
+00100
I2
Q
%R0010
+00878
TEST1 :
12-32
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
12
LABEL
The LABEL instruction functions as the target destination of a JUMP. Use the LABEL instruction
to resume normal program execution after a JUMP instruction.
There can be only one LABEL with a particular label name in a program. Programs without a
matched JUMP/LABEL pair can be created and stored to the PLC, but cannot be executed.
Logicmaster 90-30/20/Micro software supports two forms of the LABEL function, a non-nested
and a nested form. For example, the non-nested form, LABEL01 :, must be used with the nonnested JUMP function, ——————>>LABEL01; the nested form, LABEL01 : (nested), must be
used with the nested JUMP function, ———N——>>LABEL01.
The LABEL instruction has no inputs and no outputs. Also, there can be nothing either before or
after a LABEL in a rung.
Non-nested LABEL:
???????:
Nested LABEL:
???????:
???????: (nested)
(nested)
Example
In the following example, when JUMP TEST1 is enabled, the scan skips ahead to the TEST1 :
(nested) LABEL, which means that the rung in-between the JUMP and LABEL is not scanned.
%I0001
N
%M0004
TEST1
%M0210
ADD
INT
%R0001
+13069
I1
CONST
+00100
I2
Q
%R0010
+00878
TEST1 : (nested)
GFK-0467M
Chapter 12 Control Functions
12-33
12
COMMENT
Comments are useful for adding explanations, notes, revision level information, etc. to your ladder
program. Use of comments is highly recommended because they provide valuable information to
those who may have to troubleshoot or update the system in the future. Also, since human
memories are imperfect, comments are valuable references for even the creator of the ladder
program.
Note
To conserve PLC memory, annotations (comments, nicknames, and descriptions)
are not written to the PLC. Therefore, to view these annotations, you must have
a copy of the original program folder (which includes the annotations) on your
computer. Then, when you connect your computer to the PLC, the links to the
annotations will automatically be made by your programming software.
Creating a Standard Comment
A comment can have up to 2048 characters of text. In Logicmaster, it is represented in the ladder
logic like this:
(*
COMMENT
*)
Creating a Comment
1. Create a new rung. A COMMENT rung cannot have any other logic besides the COMMENT
instruction.
2. Insert the COMMENT, which is found in the Control group of instructions.
3. Accept the rung by pressing the Escape key.
4. Move the cursor over the (* COMMENT *) instruction just created and press the Zoom key
(F10) to enter the comment editor screen.
5. Type in your comment text. Note that the lines do not automatically wrap in the comment
editor. You must press the Enter key at the end of a line to begin typing on the next line.
6. When finished, press Escape key to exit the comment editor and save the comment.
Once created, COMMENT text can be read or edited by moving the cursor to (* COMMENT *)
and selecting Zoom (F10). Rung Comments can also be printed from Logicmaster’s Print menu.
Creating a Long Comment for use in Logicmaster Printouts
In Logicmaster longer text can be included in printouts using an annotation text file:
1.
Create the comment (see previous section for comment creation details):
A. Enter comment text to the point where the text from the other file should begin.
B. On a new line, enter \I (or \i), the drive letter followed by a colon, a backslash, the
subdirectory or folder, a backslash, and the file name, as shown in this example:
\I d:\text\commnt1
(Drive designation is not necessary if the file is on the same drive as the program folder.)
C. Press Escape to exit the comment editor and save the comment text.
12-34
2.
Open a text processor and create a text file.
3.
Save the text file in a .txt format, giving it the file name entered in the comment, and saving it
on the drive and in the path specified in the comment.
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
12
SVCREQ
The Service Request instruction is a general purpose instruction that can perform a wide variety of
special instructions (services) that are not available as individual function blocks. Use the Service
Request (SVCREQ) function to request one of the following special PLC services:
Table 12-4. Service Request Functions
Function
Change/Read Constant Sweep Timer.
2
Read Window Values.
3
Change Programmer Communications Window Mode and Timer Value.
4
Change System Comm. Window Mode and Timer Value.
6
Change/Read Checksum Task State and Number of Words to Checksum.
7
Change/Read Time-of-Day Clock.
8
Reset Watchdog Timer.
9
Read Sweep Time from Beginning of Sweep.
10
Read Folder Name.
11
Read PLC ID.
12
Read PLC Run State.
13
Shut Down the PLC.
14
Clear Fault Tables.
15
Read Last-Logged Fault Table Entry.
16
Read Elapsed Time Clock.
18
Read I/O Override Status.
23
Read Master Checksum.
24
Reset Smart Module
26/30
GFK-0467M
Description
1
Interrogate I/O.
29
Read Elapsed Power Down Time.
45
Skip Next Output and Input Scan. (Suspend I/O.)
46
Access Fast Backplane Status.
48
Reboot After Fatal Fault Auto Reset
49
Auto Reset Statistics
Chapter 12 Control Functions
12-35
12
SVC REQ Overview
The SVCREQ function has three input parameters and one output parameter. When the SVCREQ
receives power flow, the PLC is requested to perform the function FNC indicated. Parameters for
the function begin at the reference given for PARM. The SVCREQ function passes power flow
unless an incorrect function number, incorrect parameters, or out-of-range references are specified.
Additional causes for failure are described on the pages that follow.
The reference given for PARM can represent any type of word memory (%R, %AI, or %AQ). This
reference is the first of a group that make up the “parameter block” for the function. Successive
16-bit locations store additional parameters. The total number of references required will depend on
the type of SVCREQ function being used.
Parameter blocks can be used both as inputs for the function and as the location where data is
output after the function executes. Therefore, data returned by the function is accessed at the same
location specified for PARM.
_____
|
|
(enable) —| SVC_|— (ok)
|
|
| REQ |
|
|
(service number) —|FNC |
|
|
|
|
(beginning reference)-|PARM |
|
|
|_____|
Parameters
Parameter
Description
enable
When enable is on, the service request is performed.
FNC
Each type of Service Request has a unique function number, which must be programmed
at the FNC input. FNC may contain either a constant or a reference address that contains
the function number of the requested service.
PARM contains the beginning reference for the parameter block for the requested
service.
PARM
ok
The ok output is energized when the function is performed without error.
Valid Memory Types
Parameter
flow
%I
%Q
%M
%T
enable
•
FNC
•
•
•
PARM
•
•
•
ok
•
12-36
%S
%G
%R
%AI %AQ const
•
•
•
•
•
•
•
•
•
•
•
none
•
•
Valid reference or place where power can flow through the function.
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
12
Example
In the following example, when enable contact %I0001 is ON, SVCREQ function number 7,
specified at input FNC, is performed. The function’s parameter block starts at %R0001 (specified
at PARM). Output coil %Q0001 is set ON if the operation succeeds.
|
_____
|%I0001 |
|
%Q0001
|——| |———| SVC_|———————————————————————————————————————————————————————————( )—
|
|
|
|
| REQ |
|
|
|
| CONST —|FNC |
| 00007 |
|
|
|
|
|
|
|
|%R0001 —|PARM |
|
|_____|
|
GFK-0467M
Chapter 12 Control Functions
12-37
12
SVCREQ #1: Change/Read Constant Sweep Timer
Beginning with 90-30 CPU Release 8.0, use SVCREQ function #1 to:
•
Disable CONSTANT SWEEP mode.
•
Enable CONSTANT SWEEP mode and use the old timer value.
•
Enable CONSTANT SWEEP mode and use a new timer value.
•
Set a new timer value only.
•
Read CONSTANT SWEEP mode state and timer value.
Note
Of the CPUs discussed in this manual, Service Request 1 is supported only by 9030 CPUs, beginning with Release 8.0.
The parameter block has a length of two words.
To disable CONSTANT SWEEP mode, enter SVCREQ function #1 with this parameter block:
0
address
ignored
address + 1
To enable CONSTANT SWEEP mode, enter SVCREQ function #1 with this parameter block:
1
address
0 or timer value
address + 1
Note
If the timer should use a new value, enter it in the second word. If the timer value
should not be changed, enter 0 in the second word. If the timer value does not
already exist, entering 0 will cause the function to set the OK output to OFF.
To change the timer value without changing the selection for sweep mode state, enter SVCREQ
function #1 with this parameter block:
2
new timer value
address
address + 1
To read the current timer state and value without changing either, enter SVCREQ function #1 with
this parameter block:
3
ignored
12-38
address
address + 1
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
12
Note
After using SVCREQ function #1 with the parameter block on the previous page,
Release 8 and higher CPUs will provide the return values 0 for Normal Sweep, 1
for Constant Sweep. Do not confuse this with the input values shown below.
Successful execution will occur, unless:
1. A number other than 0, 1, 2, or 3 is entered as the requested operation:
0
Disable CONSTANT SWEEP mode.
1
Enable CONSTANT SWEEP mode.
2
Set a new timer value only.
3
Read CONSTANT SWEEP mode and timer value. (See Note
above).
2.
The time value is greater than 2550 ms (2.55 seconds).
3.
Constant sweep time is enabled with no timer value programmed, or with an old value of 0 for
the timer.
After the function executes, the function returns the timer state and value in the same parameter
block references:
0 = Disabled
address
1 = enabled
current timer value
address + 1
If word address + 1 contains the hexadecimal value FFFF, no timer value has ever been
programmed.
GFK-0467M
Chapter 12 Control Functions
12-39
12
Example
This example shows logic in a program block. When enabling contact OV_SWP is set, the constant
sweep timer is read, the timer is increased by two milliseconds, and the new timer value is sent
back to the PLC. The parameter block is in local memory at location %R3050. Because the MOVE
and ADD functions require three horizontal contact positions, the example logic uses discrete
internal coil %M0001 as a temporary location to hold the successful result of the first rung line. On
any sweep in which OV_SWP is not set, %M0001 is turned off.
|
_____
_____
_____
|OV_SWP |
|
|
|
|
|
%M0001
|——| |———|MOVE_|—————————————————| SVC_|——————————| ADD_|——————————————————( )—
|
| WORD|
| REQ |
| INT |
|
|
|
|
|
|
|
| CONST —|IN Q|—%R3050
CONST —|FNC |
%R3051—|I1 Q|—%R3051
| 0003 | LEN |
0001 |
|
|
|
|
| 0001|
|
|
|
|
|
|_____|
%R3050—|PARM |
CONST —|I2
|
|
|_____|
0002 |_____|
|
_____
_____
| M0001 |
|
|
|
|——| |———|MOVE_|—————————————————|SVC_ |—
|
|WORD |
| REQ |
|
|
|
|
|
| CONST —|IN Q|—%R3050
CONST —|FNC |
| 0001 | LEN |
0001 |
|
|
| 0001|
|
|
|
|_____|
%R3050—|PARM |
|
|_____|
12-40
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
12
SVCREQ #2: Read Window Values
Use SVCREQ function #2 to obtain the current window mode time values for the programmer
communications window and the system communications window.
Note
Of the CPUs discussed in this manual, Service Request 2 is supported only by
90-30 CPUs, beginning with Release 8.0.
There are three modes for each window:
Mode Name
Value
Description
Limited Mode
0
The execution time of the window is limited to its respective
default value or to a value defined using SVCREQ function #3
for the programmer communications window or SVCREQ
function #4 for the systems communications window. The
window will terminate when it has no more tasks to complete.
Constant Mode
1
Each window will operate in a RUN TO COMPLETION mode, and
the PLC will alternate between the two windows for a time
equal to the sum of each window’s respective time value. If
one window is placed in CONSTANT mode, the remaining two
windows are automatically placed in CONSTANT mode. If the
PLC is operating in CONSTANT WINDOW mode and a
particular window’s execution time is not defined using the associated
SVCREQ function, the default time for that window is used in the
constant window time calculation.
Run to Completion
Mode
2
Regardless of the window time associated with a particular
window, whether default or defined using a service request
function, the window will run until all tasks within that window are
completed.
A window is disabled when the time value is zero.
The parameter block has a length of three words:
Programmer Window
System Communications Window
Reserved*
High Byte
Low Byte
Mode
Value in ms
Mode
Value in ms
address + 1
*See Note
*See Note
address + 2
address
* Note. The address + 2 word is reserved for use by the system. All zeros will be returned here.
All parameters are output parameters. It is not necessary to enter values in the parameter block to
program this function. Output values for both window are given in milliseconds.
GFK-0467M
Chapter 12 Control Functions
12-41
12
Example
In the following example, when enabling output %Q0102 is set, the PLC operating system places
the current time values of the three windows in the parameter block starting at location %R0100.
Additional examples showing the Read Window Values function are included in the next three
SYS REQ function descriptions.
|
_____
|%Q0102 |
|
|——| |———| SVC_|
|
| REQ |
|
|
|
| CONST —|FNC |
| 0002 |
|
|
|
|
| %R0100—|PARM |
|
|_____|
|
12-42
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
12
SVCREQ #3: Change Programmer Communications Window Mode and Timer Value
Use SVCREQ function #3 to change the programmer communications window mode and timer
value. The change will occur in the CPU sweep following the sweep in which the function is
called.
Note
Of the CPUs discussed in this manual, Service Request 3 is supported only by
90-30 CPUs, beginning with Release 8.0.
The SVCREQ function #3 will pass power flow to the right unless a mode other than 0 (Limited), 1
(Constant), or 2 (Run-to-Completion) is selected.
The parameter block has a length of one word.
To disable the programmer window, enter SVCREQ function #3 with this parameter block:
High Byte
Low Byte
0
0
address
To enable the programmer window, enter SVCREQ function #3 with this parameter block:
GFK-0467M
High Byte
Low Byte
Mode
Value from 1 to 255 ms
Chapter 12 Control Functions
address
12-43
12
Example
In the following example, when %M0125 transitions on, the programmer communications window
is enabled and assigned a value of 25 ms. The parameter block is in memory location %R5051.
| %I0001
%M0125
|——| |—————————————————————————————————————————————————————————————————(↑)—
|
|
_____
_____
| %M0125 |
|
|
|
%T0002
|——| |———|MOVE_|———————————————————| SVC_|—————————————————————————————( )—
|
| INT |
| REQ |
|
|
|
|
|
| CONST —|IN Q|— %R5051
CONST —|FNC |
|+00025 | LEN |
00003 |
|
|
| 0001|
|
|
|
|_____|
%R5051—|PARM |
|
|_____|
To disable the programmer communications window, use Service Request 3 to assign a value of
zero (0). In this example, when %M0126 transitions on, the programmer communications window
is enabled and assigned a value of 0 ms. The parameter block is in memory location %R5051.
| %I0002
%M0126
|——| |—————————————————————————————————————————————————————————————————(↑)—
|
|
_____
_____
| %M0126 |
|
|
|
%T0002
|——| |———|MOVE_|———————————————————| SVC_|—————————————————————————————( )—
|
| INT |
| REQ |
|
|
|
|
|
| CONST —|IN Q|— %R5051
CONST —|FNC |
|+00000 | LEN |
00003 |
|
|
| 0001|
|
|
|
|_____|
%R5051—|PARM |
|
|_____|
12-44
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
12
SVCREQ #4: Change System Comm Window Mode and Timer Value
Use SVCREQ function #4 to change the system communications window mode and timer value.
The change will occur in the CPU sweep following the sweep in which the function is called.
Note
Of the CPUs discussed in this manual, Service Request 4 is supported only by
90-30 CPUs, beginning with Release 8.0.
The SVCREQ function #4 will pass power flow to the right unless a mode other than 0 (Limited), 1
(Constant), or 2 (Run-to-Completion) is selected.
The parameter block has a length of one word.
To disable the system communications window, enter SVCREQ function #4 with this parameter
block:
High Byte
Low Byte
0
0
address
To enable the system communications window, enter SVCREQ function #4 with this parameter
block:
GFK-0467M
High Byte
Low Byte
Mode
Value from 1 to 255 ms
Chapter 12 Control Functions
address
12-45
12
Example
In the following example, when enabling output %M0125 transitions on, the mode and timer value
of the system communications window is read. If the timer value is greater than or equal to 25 ms,
the value is not changed. If it is less than 25 ms, the value is changed to 25 ms. In either case, when
the rung completes execution the window is enabled. The parameter block for all three windows is
at location %R5051. Since the mode and timer for the system communications window is the
second value in the parameter block returned from the Read Window Values function (function
#2), the location of the existing window time for the system communications window is in the low
byte of %R5052.
| %I0001
%M0125
|——| |——————————————————————————————————————————————————————————————(↑)—
|
|
_____
_____
_____
| %M0125 |
|
|
|
|
|
|——| |———| SVC_|——————————| AND_|——————————————————| AND_|
|
| REQ |
| WORD|
| WORD|
|
|
|
|
|
|
|
| CONST —|FNC |
%R5052—|I1 Q|— %R5060
%R5052—|I1 Q|—%R50061
| 0002 |
|
|
|
|
|
|
|
|
|
|
CONST —|I2
|
| %R5051—|PARM |
CONST —|I2
|
FF00
|
|
|
|_____|
00FF
|_____|
|_____|
|
|
|
_____
_____
_____
| %M0125 |
|
|
|
|
|
|——| |———| LT |
+————————————| OR |————————————————|SVC_ |—
|
|WORD |
|
|WORD |
| REQ_|
|
|
|
|
|
|
|
|
| %R5060—|I1 Q|———————+
%R5061—|I1 Q|— %R5052 CONST —|FNC |
|
|
|
|
|
0004 |
|
| CONST —|I2
|
CONST —|I2
|
|
|
| 0025 |
|
0025 |
|
%R5052—|PARM |
|
|_____|
|_____|
|_____|
|
12-46
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
12
SVCREQ #6: Change/Read Number of Words to Checksum
Use the SVCREQ function with function number 6 in order to:
•
Read the current word count.
•
Set a new word count.
Successful execution will occur, unless some number other than 0 or 1 is entered as the requested
operation (see below).
For the Checksum Task functions, the parameter block has a length of 2 words.
To Read the Current Word Count:
Enter SVCREQ function 6 with this parameter block:
0
address
ignored
address + 1
After the function executes, the function returns the current checksum in the second word of the
parameter block. No range is specified for the read function; the value returned is the number of
words currently being checksummed.
0
address
current word count
address + 1
To Set a New Word Count:
Enter SVCREQ function 6 with this parameter block:
1
address
new word count (0 – 32)
address + 1
Entering 1 causes the PLC to adjust the number of words to be checksummed to the value given in
the second word of the parameter block. For any Series 90-30 CPU, the second word value can be
from 0 to 32. If the value is outside this range, an error will be generated. For the Series 90-20
CPU211, the value can be either 0 or 4.
Note
This Service Request is not available on Micro PLCs.
GFK-0467M
Chapter 12 Control Functions
12-47
12
Example
In the following example, when enabling contact FST_SCN is set, the parameter blocks for the
checksum task function are built. Later in the program when input %I0137 turns on, the number of
words being checksummed is read from the PLC operating system. This number is increased by 16,
with the results of the ADD_INT function being placed in the “hold new count for set” parameter.
The second service request block requests the PLC to set the new word count.
|
_____
_____
| FST_SCN |
|
|
|
|———| |———| XOR_|—————————————————|MOVE_|
|
|
|
|
|
|
| WORD|
| INT |
|
|
|
|
|
| %R0150 —|I1 Q|— %R0150 CONST —|IN Q|— %R0152
|
|
|
+00001 | LEN |
|
|
|
|00001|
| %R0150 —|I2
|
|_____|
|
|_____|
|
.
.
|
_____
_____
_____
| %I0137
|
|
|
|
|
|
|———| |——————| SVC_|—————————| ADD_|—————————————————| SVC_|—
|
|
|
|
|
|
|
|
| REQ |
| INT |
| REQ |
|
|
|
|
|
|
|
|
CONST —|FNC | %R0151 —|I1 Q|— %R0153 CONST —|FNC |
|
00006 |
|
|
|
00006 |
|
|
|
|
|
|
|
|
|
%R0150 —|PARM | CONST —|I2
|
%R0152 —|PARM |
|
|_____| +00016 |_____|
|_____|
|
The example parameter blocks are located at address %R0150. They have the following content:
12-48
0 = read current count
%R0150
Hold current count
%R0151
1 = set current count
%R0152
Hold new count for set
%R0153
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
12
SVCREQ #7: Change/Read Time-of-Day Clock
Use the SVCREQ function with function number 7 to read and set the time-of-day clock in the
PLC.
Note
This function is available only in 331 or higher 90-30 CPUs and on the 28-point
Series 90 Micro PLC CPUs (that is, IC693UDR005, IC693UAA007, and
IC693UDR010) and the 23-point Series 90 Micro PLC CPUs (IC693UAL006).
Successful execution will occur unless:
1.
Some number other than 0 or 1 is entered as the requested operation (see below).
2.
An invalid data format is specified.
3.
The data provided is not in the expected format.
4.
An invalid date is entered, such as 02/29/01, which incorrectly specifies a leap year day in the
year 2001 (2001 is not a leap year).
For the date/time functions, the length of the parameter block depends on the data format. BCD
format requires 6 words; packed ASCII requires 12 words.
0 = read time and date
address
1 = set time and date
1 = BCD format
address + 1
3 = packed ASCII format
data
address + 2 to end
In word 1, specify whether the function should read or change the values.
0
1
=
=
read
change
In word 2, specify a data format:
1
3
=
=
BCD
packed ASCII with embedded spaces and colons
Words 3 to the end of the parameter block contain output data returned by a read function, or new
data being supplied by a change function. In both cases, format of these data words is the same.
When reading the date and time, words (address + 2) through (address + 8) of the parameter block
are ignored on input.
GFK-0467M
Chapter 12 Control Functions
12-49
12
Example
In the following example, when called for by previous logic, a parameter block for the time-of-day
clock is built to first request the current date and time, and then set the clock to 12 noon using the
BCD format. The parameter block is located at global data location %R0300. Array NOON has
been set up elsewhere in the program to contain the values 12, 0, and 0. (Array NOON must also
contain the data at %R0300.) The BCD format requires six contiguous memory locations for the
parameter block.
|
|
|
_____
_____
|FST_SCN |
|
|
|
|——| |———+MOVE_+—————————————————+MOVE_+|
|
|
|
|
|
| INT |
| INT |
|
|
|
|
|
| CONST -|IN Q+- NOON
CONST -+IN Q+- MIN_SEC
|
|
|
|
|
| +04608 | LEN |
+00000 | LEN |
|
|00001|
|00001|
|
|_____|
|_____|
|
|
|
|
_____
_____
_____
|%I0016 |
|
|
|
|
|
%T0001
|——| |———+MOVE +—————————————————+MOVE +—————————————————+ SVC +—————————————( )|
|
|
|
|
|
|
|
| INT |
| INT |
| REQ |
|
|
|
|
|
|
|
| CONST -+IN Q+- %R0300 CONST -+IN Q+- %R0301 CONST -+FNC |
|
|
|
|
|
|
|
| +00000 | LEN |
+00001 | LEN |
+00007 |
|
|
|00001|
|00001|
|
|
|
|_____|
|_____|
%R0300 -+PARM |
|
|_____|
|
|
|
|
_____
_____
|%T0001 %I0017 |
|
|
|
|——| |————| |————+ AND_+—————————————————+ ADD_+|
|
|
|
|
|
| WORD|
| INT |
|
|
|
|
|
|
%R0303 -+I1 Q+- %R0303 %R0303 -+I1 Q+- %R0303
|
|
|
|
|
|
CONST -+I2
|
NOON -+I2
|
|
00FF |_____|
|_____|
|
|
|
|
_____
_____
_____
|%T0001 %I0017 |
|
|
|
|
|
|——| |—————| |———+MOVE_+—————————————————+MOVE_+—————————————————+ SVC_+–
|
| INT |
| INT |
| REQ |
|
|
|
|
|
|
|
|
MIN_SEC-+IN Q+- %R0304 CONST -+IN Q+- %R0300 CONST -+FNC |
|
| LEN |
+00001 | LEN |
+00007 |
|
|
|00002|
|00001|
|
|
|
|_____|
|_____|
%R0300 -+PARM |
|
|_____|
|
12-50
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
12
Parameter Block Contents
Parameter block contents for the different data formats are shown on the following pages. For both
data formats:
•
Hours are stored in 24-hour format.
•
Day of the week is a numeric value:
Value
Day of the Week
1
Sunday
2
Monday
3
Tuesday
4
Wednesday
5
Thursday
6
Friday
7
Saturday
To Change/Read Date and Time Using BCD Format:
In BCD format, each of the time and date items occupies a single byte. This format requires six
words. The last byte of the sixth word is not used. When setting the date and time, this byte is
ignored; when reading date and time, the function returns a null character (00).
High Byte
1 = change
Low Byte
or
0 = read
1
GFK-0467M
Example output parameter block:
Read Date and Time in BCD format
(Sun., July 3, 1988, at 2:45:30 p.m.)
address
0
address + 1
1
month
year
address + 2
07
88
hours
day of month
address + 3
14
03
seconds
minutes
address + 4
30
45
(null)
day of week
address + 5
00
01
Chapter 12 Control Functions
12-51
12
To Change/Read Date and Time Using Packed ASCII with
Embedded Colons Format
In Packed ASCII format, each digit of the time and date items is an ASCII formatted byte. In
addition, spaces and colons are embedded into the data to permit it to be transferred unchanged to a
printing or display device. This format requires 12 words.
High Byte
1 = change
Low Byte
or
0 = read
3
year
12-52
Example output parameter block:
Read Date and Time in Packed ASCII Format
(Mon, Oct. 2, 1989 at 23:13:00)
year
address
0
address + 1
3
address + 2
39
38
month
(space)
address + 3
31
20
(space)
month
address + 4
20
30
day of month
day of month
address + 5
32
30
hours
(space)
address + 6
32
20
:
hours
address + 7
3A
33
minutes
minutes
address + 8
33
31
seconds
:
address + 9
30
3A
(space)
seconds
address + 10
20
30
day of week
day of week
address + 11
32
30
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
12
SVCREQ #8: Reset Watchdog Timer
Use SVCREQ function #8 to reset the watchdog timer during the sweep.
Note
Of the CPUs discussed in this manual, Service Request 8 is supported only by
90-30 CPUs, beginning with Release 8.0.
When the watchdog timer expires, the PLC shuts down without warning. This function allows the
timer to keep going during a time-consuming task (for example, while waiting for a response from
a communications line).
Caution
Be sure that restarting the watchdog timer does not adversely affect the
controlled process.
This function has no associated parameter block; however, the programming software requires that
an entry be made for PARM. Enter any appropriate reference here; it will not be used.
Example
In the following example, when %Q0127 turns ON, the watchdog timer is reset.
|
_____
| %Q0127
|
|
|——| |———-—————————| SVC_|—
|
| REQ |
|
|
|
|
CONST —|FNC |
|
0008 |
|
|
|
|
|
%AI001—|PARM |
|
|_____|
|
GFK-0467M
Chapter 12 Control Functions
12-53
12
SVCREQ #9: Read Sweep Time from Beginning of Sweep
Use SVCREQ function #9 to read the time in milliseconds since the start of the sweep. The data is
in 16-bit Word format.
Note
Of the CPUs discussed in this manual, Service Request 9 is supported only by
90-30 CPUs, beginning with Release 8.0.
The parameter block is an output parameter block only; it has a length of one word.
time since start of sweep
address
Example
In the following example, the elapsed time from the start of the sweep is always read into location
%R5200. If it is greater than the value in %R5201, internal coil %M0200 is turned on.
|
_____
_____
|%Q0102 |
|
|
|
|——| |———| SVC_|——————————| GT_ |—
|
| REQ |
| WORD|
|
|
|
|
|
%M0200
| CONST —|FNC |
%R5200—|I1 Q|——————————————————————————————————————————( )—
| 0009 |
|
|
|
|
|
|
|
|
| %R5200—|PARM |
%R5201—|I2
|
|
|_____|
|_____|
|
12-54
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
12
SVCREQ #10: Read Folder Name
Use SVCREQ function #10 to read the name of the currently-executing folder.
Note
Of the CPUs discussed in this manual, Service Request 10 is supported only by
90-30 CPUs, beginning with Release 8.0.
The output parameter block has a length of four words. It returns eight ASCII characters; the last is
a null character (00h). If the program name has fewer than seven characters, null characters are
appended to the end.
Low Byte
High Byte
character 1
character 2
address
character 3
character 4
address + 1
character 5
character 6
address + 2
character 7
00
address + 3
Example
In the following example, when enabling contact %I0301 transitions ON, register location %R0099
is loaded with the value 10, which is the function code for the Read Folder Name function. In the
following rung, when %I0102 is ON, the Service Request reads the folder name and stores it in the
four-word block of memory starting at %R0100 (specified at PARM).
| %I0001
%I0301
|——| |——————————————————————————————————————————————————————————————(↑)—
|
|
_____
__________
| %I0301 |
|
|——| |———|MOVE_|—
|
| WORD|
|
|
|
| CONST —|IN Q|— %R0099
| 0010 | LEN |
|
| 0001|
|
|_____|
|
|
|%I0102 |
|
|——| |———| SVC_|—
|
| REQ |
|
|
|
| %R0099—|FNC |
|
|
|
|
|
|
| %R0100—|PARM |
|
|_____|
|
GFK-0467M
Chapter 12 Control Functions
12-55
12
SVCREQ #11: Read PLC ID
Use SVCREQ function #11 to read the name of the Series 90 PLC executing the program.
Note
Of the CPUs discussed in this manual, Service Request 11 is supported only by
90-30 CPUs, beginning with Release 8.0.
The output parameter block has a length of four words. It returns eight ASCII characters; the last is
a null character (00h). If the PLC ID has fewer than seven characters, null characters are appended
to the end.
Low Byte
High Byte
character 1
character 2
address
character 3
character 4
address + 1
character 5
character 6
address + 2
character 7
00
address + 3
Example
In the following example, when enabling contact %I0001 transitions OFF, register location
%R0099 is loaded with the value 11, which is the function code for the Read PLC ID function. . In
the following rung, when %Q0102 is ON, the Service Request reads the PLC ID and stores it in the
four-word block of memory starting at %R0100 (specified at PARM).
| %I0001
%M0301
|——| |——————————————————————————————————————————————————————————————(↓)—
|
|
_____
__________
| %M0301 |
|
|——| |———|MOVE_|
|
| WORD|
|
|
|
| CONST —|IN Q|— %R0099
| 0011 | LEN |
|
| 0001|
|
|_____|
|
|
_____
|%Q0102 |
|
|——| |———| SVC_|—
|
| REQ |
|
|
|
| %R0099—|FNC |
|
|
|
|
|
|
| %R0100—|PARM |
|
|_____|
|
12-56
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
12
SVCREQ #12: Read PLC Run State
Use SVCREQ function #12 to read the current RUN state of the PLC CPU.
Note
Of the CPUs discussed in this manual, Service Request 12 is supported only by
90-30 CPUs, beginning with Release 8.0.
The parameter block is an output parameter block only; it has a length of one word. There are only
two valid results obtainable from the execution of this Service Request:
1 = run/disabled
address
2 = run/enabled
Example
In the following example, when %I0102 turns ON, the Service Request reads the PLC run state and
places the result in memory address %R402. If the PLC is in Run/Disabled mode, %R402 will
contain a value of 1. If the PLC is in Run/Enabled mode, %R402 will contain a value of 2.
|
_____
|%I0102 |
|
|——| |———| SVC_|—
|
| REQ |
|
|
|
| CONST —|FNC |
| 0012 |
|
|
|
|
| %R402—|PARM |
|
|_____|
|
GFK-0467M
Chapter 12 Control Functions
_____
__________
12-57
12
SVCREQ #13: Shut Down (Stop) PLC
Use SVCREQ function #13 in order to stop the PLC at the end of the next sweep. All outputs will
go to their designated default states at the beginning of the next PLC sweep. An informational fault
is placed in the PLC fault table, noting that a “SHUT DOWN PLC” function block was executed.
The I/O scan will continue as configured.
This function has no parameter block.
Example
In the following example, when a “Loss of I/O Module” fault occurs, SVCREQ function #13
executes. Since no parameter block is needed, the PARM input is not used; however, the
programming software requires that an entry be made for PARM.
This example uses a JUMP to the end of the program to force a shutdown if the Shut Down PLC
function executes successfully. This JUMP and LABEL are needed because the transition to STOP
mode does not occur until the end of the sweep in which the function executes. Once the PLC
receives this STOP command from the Service Request, it will execute one more sweep and then
stop (see NOTE below).
|
|LOS_MD
%T0001
|
|——| |——————————————————————————————————————————————————————————————————————(↑
↑)—
|
|
_____
|%T0001
|
|
|——| |———————| SVC_|——————————————————————————————————————————————————>> END_PRG
|
|
|
|
| REQ |
|
|
|
|
CONST —|FNC |
|
0013 |
|
|
|
|
|
%R1001 —|PARM |
|
|_____|
|
.
.
.
|
| END_PRG:
|
|
| [
END OF PROGRAM LOGIC
]
|
Note
To ensure that the %S0002 LST_SCN contact will operate correctly, the PLC
will execute one additional sweep after the sweep in which the SVCREQ
function #13 was executed.
12-58
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
12
SVCREQ #14: Clear Fault Tables
Use SVCREQ function #14 in order to clear either the PLC fault table or the I/O fault table. The
SVCREQ output is set ON unless some number other than 0 or 1 is entered as the requested
operation (see below).
For this function, the parameter block has a length of 1 word. It is an input parameter block only.
0 = clear PLC fault table.
address
1 = clear I/O fault table.
Example
In the following example, when contacts %I0346 and %I0349 are both on, the PLC fault table is
cleared. When contacts %I0347and %I0349 are both on, the I/O fault table is cleared. When
contacts %I0348 and %I0349 are both on, both fault tables are cleared.
The parameter block for the PLC fault table is located at %R0500, and for the I/O fault table the
parameter block is located at %R0550. Both parameter blocks are set up elsewhere in the program
(they both must be at logic 1 in order to clear their respective tables).
|
_____
|%I0349 %I0346
|
|
|——| |——+——| |——+———————| SVC_|—
|
|
|
|
|
|
|
|
| REQ |
|
|%I0348 |
|
|
|
+——| |——+CONST —|FNC |
|
0014 |
|
|
|
|
|
%R0500 —|PARM |
|
|_____|
|
|
_____
|%I0349 %I0347
|
|
|——| |——+——| |——+———————| SVC_||
|
|
|
|
|
|
|
| REQ |
|
|%I0348 |
|
|
|
+——| |——+CONST -|FNC |
|
0014 |
|
|
|
|
|
%R0550 -|PARM |
|
|_____|
|
GFK-0467M
Chapter 12 Control Functions
12-59
12
SVCREQ #15: Read Last-Logged Fault Table Entry
Use SVCREQ function #15 in order to read the last entry logged in either the PLC fault table or the
I/O fault table. The SVCREQ output is set ON unless some number other than 0 or 1 is entered as
the requested operation (see below), or the fault table is empty. (For additional information on fault
table entries, refer to chapter 3, “Fault Explanations and Correction.”)
For this function, the parameter block has a length of 22 words. The input parameter block has this
format:
0 = Read PLC fault table.
address
1 = Read I/O fault table.
The format for the output parameter block depends on whether the function reads data from the
PLC fault table or the I/O fault table.
PLC Fault Table Output Format
Low Byte
I/O Fault Table Output Format
High Byte
Low Byte
0
address + 1
address + 2
long/short
reference address
PLC fault address
address + 3
address + 4
I/O fault address
address + 5
address + 6
fault group and action
address + 7
address + 8
fault category
fault description
fault specific data
time stamp
12-60
1
long/short
spare
fault group and action
error code
High Byte
address + 9
address + 10
address + 11
address + 12
address + 13
address + 14
address + 15
address + 16
address + 17
address + 18
address + 19
address + 20
address + 21
fault type
fault specific data
time stamp
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
12
In the first byte of word address + 1, the Long/Short indicator defines the quantity of fault specific
data present in the fault entry. It can be:
PLC Fault Table:
I/O Fault Table:
00
01
02
03
=
=
=
=
-8
24
—5
21
bytes
bytes
bytes
bytes
(short)
(long)
(short)
(long)
Example 1
In the following example, when input %I0251 is on and input %I0250 is on, the last entry in the
PLC fault table is read into the parameter block. When input %I0251 is off and input %I0250 is on,
the last entry in the I/O fault table is read into the parameter block. The parameter block is located
at location %R0600.
|
_____
|%I0250 %I0251 |
|
|——| |—————| |———|MOVE_|
|
|
|
|
| INT |
|
|
|
|
CONST —|IN Q|– %R0600
|
0000 | LEN |
|
| 0001|
|
|_____|
|
|
_____
|%I0250 %I0251 |
|
|——| |—————|/|———|MOVE_|
|
|
|
|
| INT |
|
|
|
|
CONST —|IN Q|— %R0600
|
0001 | LEN |
|
| 0001|
|
|_____|
|
|
_____
|ALW_ON |
|
|——| |———| SVC_|—
|
|
|
|
| REQ |
|
|
|
| CONST —|FNC |
|
0015 |
|
|
|
|
|%R0600 —|PARM |
|
|_____|
|
GFK-0467M
Chapter 12 Control Functions
12-61
12
Example 2
In the next example, the PLC is shut down when any fault occurs on an I/O module except when
the fault occurs on modules in rack 0, slot 9 and in rack 1, slot 9. If faults occur on these two
modules, the system remains running. The parameter for “table type” is set up on the first sweep.
The contact IO_PRES, when set, indicates that the I/O fault table contains an entry. The PLC CPU
sets the normally open contact in the next sweep after the fault logic places a fault in the table. If
faults are placed in the table in two consecutive sweeps, the normally open contact is set for two
consecutive sweeps.
The example uses a parameter block located at %R0600. After the SVCREQ function executes, the
fourth word of the parameter block contains the rack and slot location of the I/O module that
faulted:
1
%R0600
long/short
%R0601
reference address
%R0602
rack number
slot number
%R0603
I/O bus no.
bus address
%R0604
point address
%R0605
fault data
In the program, the EQ_INT blocks compare the rack/slot address in the table to hexadecimal
constants. The internal coil %M0007 is turned on when the rack/slot where the fault occurred meets
the criteria specified above. If coil %M0007 is on, its normally closed contact is off, preventing the
shutdown. Conversely, if coil %M0007 is off because the fault occurred on a different module, its
normally closed contact is on and the shutdown occurs.
12-62
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
12
|
_____
|FST_SCN |
|
|——| |———|MOVE_|—
|
|
|
|
| INT |
|
|
|
| CONST —|IN Q|— %R0600
|
0001 | LEN |
|
| 0001|
|
|_____|
|
|
_____
| IO_PRES|
|
%T0001
|——| |———| SVC_|————————————————————————————————————————————————————————————( )—
|
|
|
|
| REQ |
|
|
|
| CONST —|FNC |
|
0015 |
|
|
|
|
|%R0600 —|PARM |
|
|_____|
|
|
_____
|%T0001 |
|
|——| |———| EQ_ |—
|
|
|
|
| INT |
|
|
|
%M0007
|%R0603 —|I1 Q|————————————————————————————————————————————————————————————( )—
|
|
|
|
|
|
| CONST —|I2
|
|
0109 |_____|
|
|
_____
|%T0001 |
|
|——| |———| EQ_ |—
|
|
|
|
| INT |
|
|
|
%M0007
|%R0603 —|I1 Q|————————————————————————————————————————————————————————————( )—
|
|
|
|
|
|
| CONST —|I2
|
|
0265 |_____|
|
|
_____
| IO_PRES %M0007 |
|
|——| |———————|/|———| SVC_|—
|
|
|
|
| REQ |
|
|
|
|
|
|
|
CONST —|FNC |
|
0013 |
|
|
|
|
|
%R0001 —|PARM |
|
|_____|
|
GFK-0467M
Chapter 12 Control Functions
12-63
12
SVCREQ #16: Read Elapsed Time Clock
Use the SVCREQ function with function number 16 in order to read the value of the system’s
elapsed time clock. This clock tracks elapsed time in seconds since the PLC powered on. The timer
will roll over approximately once every 100 years.
This function has an output parameter block only. The parameter block has a length of 3 words.
seconds from power on (low order)
address
seconds from power on (high order)
address + 1
100 microsecond ticks
address + 2
The first two words are the elapsed time in seconds. The last word is the number of 100
microsecond ticks in the current second.
Example
In the following example, when internal coil %M0233 is on, the value of the elapsed time clock is
read and coil %M0234 is set. When it is off, the value is read again. The difference between the
values is then calculated, and the result is stored in register memory at location %R0250.
The parameter block for the first read is at %R0127; for the second read, at %R0131. The
calculation ignores the number of hundred microsecond ticks and the fact that the DINT type is
actually a signed value. The calculation is correct until the time since power-on reaches
approximately 50 years.
|
_____
|%M0233 |
|
%M0234
|——| |———| SVC_|———————————————————————————————————————————————————————————(S)—
|
|
|
|
| REQ |
|
|
|
| CONST —|FNC |
| 00016 |
|
|
|
|
|%R0127 —|PARM |
|
|_____|
|
|
_____
_____
|%M0233
%M0234 |
|
|
|
%M0234
|——|/|———————| |———| SVC_|——————————————————| SUB_|————————————————————————(R)—
|
|
|
|
|
|
| REQ |
| DINT|
|
|
|
|
|
|
CONST —|FNC |
%R0131 —|I1 Q|— %R0250
|
00016 |
|
|
|
|
|
|
|
|
|
%R0131 —|PARM |
%R0127 —|I2
|
|
|_____|
|_____|
|
12-64
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
12
SVCREQ #18: Read I/O Override Status
Use SVCREQ function #18 in order to read the current status of overrides in the CPU.
Note
This feature is available only for 331 or higher CPUs.
For this function, the parameter block has a length of 1 word. It is an output parameter block only.
0 = No overrides are set.
address
1 = Overrides are set.
Note
SVCREQ #18 reports only overrides of %I and %Q references.
Example
In the following example, the status of I/O overrides is always read into location %R1003. If any
overrides are present, output %T0001 is set on.
|
_____
_____
|%I0001 |
|
|
|
|——|/|———| SVC_|——————————| EQ_ |–
|
|
|
|
|
|
| REQ |
| INT |
|
|
|
|
|
%T0001
| CONST —|FNC |
CONST —|I1 Q|——————————————————————————————————————————( )—
| 00018 |
|
00001 |
|
|
|
|
|
|
|%R1003 —|PARM | %R1003 —|I2
|
|
|_____|
|_____|
|
GFK-0467M
Chapter 12 Control Functions
12-65
12
SVCREQ #23: Read Master Checksum
Use SVCREQ function #23 to read the master checksums for the user program and the
configuration. The SVCREQ output is always set to ON if the function is enabled, and the output
block of information (see below) starts at the address given in parameter 3 (PARM) of the
SVCREQ function.
When a RUN MODE STORE is active, the program checksums may not be valid until the store is
complete. Therefore, two flags are provided at the beginning of the output parameter block to
indicate when the program and configuration checksums are valid.
For this function, the output parameter block has a length of 12 words with this format:
Master Program Checksum Valid (0 = not valid, 1 = valid)
address
Master Configuration Checksum Valid (0 = not valid, 1 = valid)
address + 1
Number of Program Blocks (including _MAIN)
address + 2
Size of User Program in Bytes (DWORD data type)
address + 3
Program Additive Checksum
address + 5
Program CRC Checksum (DWORD data type)
address + 6
Size of Configuration Data in Bytes
address + 8
Configuration Additive Checksum
address + 9
Configuration CRC Checksum (DWORD data type)
address + 10
Example
In the following example, when input %I0251 is ON, the master checksum information is placed
into the parameter block, and the output coil (%Q0001) is turned on. The parameter block is
located at %R0050.
|
_____
|%I0251 |
|
%Q0001
|——| |———| SVC_|——————————————————————————————————————————————————————————( )—
|
|
|
|
| REQ |
|
|
|
| CONST —|FNC |
| +0023 |
|
|
|
|
|%R0050 —|PARM |
|
|_____|
|
12-66
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
12
SVCREQ #24: Reset Smart Module
Use SVCREQ function #24 to reset a daughterboard or smart module. The SVCREQ output is set
ON unless an invalid number for rack and/or slot is entered as shown below.
For this function, the parameter block has a length of 1 word. It is an input parameter block only.
Module Slot (low byte)
address
Module Rack (high byte)
Note:
Rack 0, Slot 1 shall indicate a reset is to be sent to the daughterboard.
Example
In the following example, when input %I0346 is on and input %I0349 is on, the module indicated
by the Rack/Slot present in %R0500 is reset.
The parameter block containing the modules rack and slot for the reset module Service Request is
located at %R0500. The parameter block is set up elsewhere in the program.
|
_____
|%I0349 %I0346
|
|
|——| |——+——| |——+———————| SVC_|—
|
|
|
|
|
|
|
|
| REQ |
|
|%I0348 |
|
|
|
+——| |——+CONST —|FNC |
|
0024 |
|
|
|
|
|
%R0500 —|PARM |
|
|_____|
|
|
_____
|
|
GFK-0467M
Chapter 12 Control Functions
12-67
12
SVCREQ #26/30: Interrogate I/O
Use SVCREQ function #26 (or #30—they are identical; i.e., you can use either number to
accomplish the same thing) to interrogate the actual modules present and compare them with the
rack/slot configuration, generating addition, loss, and mismatch alarms, as if a store configuration
had been performed. This SVCREQ will generate faults on both the PLC and I/O fault tables,
depending on the fault.
This function has no parameter block and always outputs power flow.
Note
The time for this SVCREQ to execute depends on how many faults exist.
Therefore, execution time of this SVCREQ will be greater for situations where
more modules are at fault.
Example
In the following example, when input %I0251 is ON, the actual modules are interrogated and
compared to the rack/slot configuration. Output %Q0001 is turned on after the SVCREQ is
complete.
|
_____
|%I0251 |
|
%Q0001
|——| |———| SVC_|——————————————————————————————————————————————————————————( )—
|
|
|
|
| REQ |
|
|
|
| CONST —|FNC |
| +0026 |
|
|
|
|
|%R0050 —|PARM |
|
|_____|
|
Note
This Service Request is not available on Micro PLCs.
12-68
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
12
SVCREQ #29: Read Elapsed Power Down Time
Use the SVCREQ function #29 to read the amount of time elapsed between the last power-down
and the most recent power-up. The SVCREQ output is always set to ON, and the output block of
information (see below) starts at the address given in parameter 3 (PARM) of the SVCREQ
function.
Note
This function is available only in the 331 or higher CPUs.
This function has an output parameter block only. The parameter block has a length of 3 words.
Power-Down Elapsed Seconds (low order)
address
Power-Down Elapsed Seconds (high order)
address + 1
100 Microsecond ticks
address + 2
The first two words are the power-down elapsed time in seconds. The last word is the remaining
power-down elapsed time in 100 microsecond ticks (which is always 0). Whenever the PLC can
not properly calculate the power down elapsed time, the time will be set to 0. This will happen
when the PLC is powered up with CLR M/T pressed on the HHP. This will also happen if the
watchdog timer times out before power-down.
Example
In the following example, when input %I0251 is ON, the Elapsed Power-Down Time is placed into
the parameter block, and the output coil (%Q0001) is turned on. The parameter block is located at
%R0050.
|
_____
|%I0251 |
|
%Q0001
|——| |———| SVC_|——————————————————————————————————————————————————————————( )—
|
|
|
|
| REQ |
|
|
|
| CONST -|FNC |
| +0029 |
|
|
|
|
|%R0050 -|PARM |
|
|_____|
|
GFK-0467M
Chapter 12 Control Functions
12-69
12
SVCREQ #45: Skip Next Output & Input Scan
(Suspend I/O) Use the SVCREQ function #45 to skip the next output and input scans. Any changes
to the output reference tables during the sweep in which the SVCREQ #45 was executed will not
be reflected on the physical outputs of the corresponding modules. Any changes to the physical
input data on the modules will not be reflected in the corresponding input references during the
sweep after the one in which the SVCREQ #45 was executed.
This function has no parameter block.
Note
The DOIO Function Block is not affected by the use of SVCREQ #45. It will still
update the I/O when used in the same logic program as the SVCREQ #45.
Example
In the following example, when the “Idle” contact passes power flow, the next Output and Input
Scan are skipped.
IDLE
SVC_
REQ
12-70
CONST
00045
FNC
%R0001
PARAM
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
12
SVCREQ #46: Fast Backplane Status Access
This function is a method of communicating a few bits to or from one or more smart modules very
quickly across the PLC backplane compared with the normal communication method. This
increase in communication speed is achieved by limiting the amount of data and the number of
replies.
Use SVCREQ function #46 to perform one of the following fast backplane access functions:
•
Read a word of extra status data from one of more specified smart modules.
•
Write a word of extra status data from one of more specified smart modules.
•
Read/Write: Read a word of extra status data from one or more specified modules and write
the data value between 0 and 15 to the same module, all in one operation.
Notes
Currently, the only module designed to support this Service Request is the
DSM314 (Digital Servo Module).
A COMM_REQ or DOIO function block should not be performed with the
specified module(s) during the same logic sweep during which either of the data
write functions are performed, since they can cause the write data to be lost.
Two functions that write to a module (Write or Read/Write) should not be
performed with the same module during the same logic sweep because they can
cause the first write data to be lost.
This Service Request is also known as “SNAP.”
This Service Request has a variable length as described below. The first word of the parameter
block determines which function will be used and has the following format:
1 = Read extra data
address (word 1)
2 = Write extra data
3 = Read/write extra data
GFK-0467M
Chapter 12 Control Functions
12-71
12
Read Extra Status Data (Function #1)
The Read Extra Data function reads a word of extra status data from each of the modules specified
by a list in the parameter block and places the status data values into the parameter block. The
parameter block requires (N + 4) words of reference memory, where N is the number of modules to
which the data will be written.
Use the table on the following page to interpret the output values.
Table 12-5. Parameter Block for Read Extra Data Function
Location
12-72
Field
Meaning
Address
Function
1 = read extra status data
Address + 1
Error Code
An error code is placed here if the function fails
because any of the modules is not present,
inappropriate, or not working. For details, see “Error
Codes” on page 12-75.
Address + 2
Error rack & slot
The rack & slot number at which the error occurred
Address + 3
First rack & slot
Rack and slot number (in the form RRSS in
hexadecimal, where RR is the rack number and SS is
the slot number) of the 1st module from which the
data will be read
Address + 4
Read data from first module
The data read from the first module will be place here
Address + 5
Second rack & slot
Rack and slot number (in the form RRSS in
hexadecimal, where RR is the rack number and SS is
the slot number) of the 2nd module from which the
data will be read
Address + 6
Read data from second
module
The data read from the second module will be place
here
Address + (I * 2) + 1
Ith rack & slot
Rack and slot number (in the form RRSS in
hexadecimal, where RR is the rack number and SS is
the slot number) of the Ith module from which the
data will be read
Address + (I * 2) + 2
Read data from Ith module
The data read from the Ith module will be place here
Address + (N * 2) + 1
Last rack & slot
Rack and slot number (in the form RRSS in
hexadecimal, where RR is the rack number and SS is
the slot number) of the last module from which the
data will be read
Address + (N * 2) + 2
Read data from last module
The data read from the last module will be place here
Address + (N * 2) + 3
End of list indicator
A zero in this word indicates the end of the list of
modules
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
12
Write Data (Function #2)
The write data function writes a data value between 0 and 15 from the parameter block to one or
more modules specified by a list in the parameter block. The parameter block requires (N + 4)
words of reference memory, where N is the number of modules to which the data will be written.
Table 12-6. Parameter Block for Write Data Function
Location
GFK-0467M
Field
Meaning
Address
Function
2 = write data
Address + 1
Error Code
An error code is placed here if the function fails
because any of the modules is not present,
inappropriate, or not working. No error code is
set if the function executes but any of the
modules does not receive the write data
properly. For details, see “Error Codes” on
page 12-75.
Address + 2
Error rack & slot
The rack & slot number at which the error
occurred
Address + 3
First rack & slot
Rack and slot number (in the form RRSS in
hexadecimal, where RR is the rack number and
SS is the slot number) of the 1st module to
which the data will be sent
Address + 4
Write data for first module
This data value will be written to the first
module
Address + 5
Second rack & slot
Rack and slot number (in the form RRSS in
hexadecimal, where RR is the rack number and
SS is the slot number) of the 2nd module to
which the data will be sent
Address + 6
Write data for second
module
This data value will be written to the second
module
Address + (I * 2) + 1
Ith rack & slot
Rack and slot number (in the form RRSS in
hexadecimal, where RR is the rack number and
SS is the slot number) of the Ith module to
which the data will be sent
Address + (I * 2) + 2
Write data for Ith module
This data value will be written to the Ith
module
Address + (N * 2) + 1
Last rack & slot
Rack and slot number (in the form RRSS in
hexadecimal, where RR is the rack number and
SS is the slot number) of the last module to
which the data will be sent
Address + (N * 2) + 2
Write data for last module
This data value will be written to the last
module
Address + (N * 2) + 3
End of list indicator
A zero in this word indicates the end of the list
of modules
Chapter 12 Control Functions
12-73
12
Read/Write Data (Function #3)
The read/write function reads a word of extra status data from a module specified in the parameter
block, then writes a data value between 0 and 15 from the parameter block to that module. This
read write process is repeated for each module in a list in the parameter block. The parameter block
(N * 3) + 3 words of reference memory, where N is the number of modules with which data will be
exchanged.
Table 12-7. Parameter Block for Read/Write Data Function
Location
12-74
Field
Meaning
Address
Function
3 = read/write
Address + 1
Error Code
An error code is placed here if the function fails because
any of the modules is not present, inappropriate, or not
working. No error code is set if the function executes but
any of the modules does not receive the write data
properly. For details, see “Error Codes” on page 12-75.
Address + 2
Error rack & slot
The rack & slot number at which the error occurred
Address + 3
First rack & slot
Rack and slot number (in the form RRSS in hexadecimal,
where RR is the rack number and SS is the slot number)
of the 1st module with which data will be exchanged
Address + 4
Read data from first module
The data read from the first module will be placed here
Address + 5
Write data for first module
This data value will be written to the first module
Address + 6
Second rack & slot
Rack and slot number (in the form RRSS in hexadecimal,
where RR is the rack number and SS is the slot number)
of the 2nd module with which data will be exchanged
Address + 7
Read data from second
module
The data read from the second module will be placed here
Address + 8
Write data for second
module
This data value will be written to the second module
Address + ((I-1) * 3) + 3
Ith rack & slot
Rack and slot number (in the form RRSS in hexadecimal,
where RR is the rack number and SS is the slot number)
of the Ith module with which data will be exchanged
Address + ((I-1) * 3) + 4
Read data from Ith module
The data read from the Ith module will be placed here
Address + ((I-1) * 3) + 5
Write data for Ith module
This data value will be written to the Ith module
Address + ((N-1) * 3) + 3
Last rack & slot
Rack and slot number (in the form RRSS in hexadecimal,
where RR is the rack number and SS is the slot number)
of the last module with which data will be exchanged
Address + ((N-1) * 3) + 4
Read data from last module
The data read from the last module will be placed here
Address + ((N-1) * 3) + 5
Write data for last module
This data value will be written to the last module
Address + (N * 3) + 3
End of list indicator
A zero in this word indicates the end of the list of modules
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
12
Table 12-8. Error Codes
Value
1
Description
Success — the function has executed normally.
-1
Module not present in the specified slot.
-2
Module inappropriate — module in the specified slot is not a smart module or does not support this
functionality.
-3
Module not working — module in the specified slot is not communicating with the CPU properly.
-4
Read data parity error — parity error occurred during a read operation from an expansion or
remote rack.
-5
Invalid function specified in the command block.
Example 1
The following example shows a Read (Specified in %R0001) of a single module, located at Rack 2,
Slot 4 (specified in %R0004). If the function completes successfully, the data read will be stored in
%R0005. If an error occurs, however, an error code will be written to %R0002, and the rack/slot
location of the module generating the error will appear in %R0003. Note that since this is a Read
function for a single module, Address + 5 and Address + 6 are not used. Therefore, the
corresponding memory locations, %R0006 and %R0007, are filled with zeros from the BLKMV
instruction’s IN6 and IN7 inputs. If an additional module were to be read, %R0006 and %R0007
would be used for the additional module. For more information on the Read function, see Table
12-5 earlier in this chapter.
%M0201
%M0202
BLKMV_
WORD
CONST
0001
IN1
CONST
0000
IN2
CONST
0000
IN3
CONST
0204
IN4
CONST
0000
IN5
CONST
0000
IN6
CONST
0000
IN7
%M0202
Q
%R0001
0001
Address
%R0001
%R0002
%R0003
%R0004
%R0005
%R0006
%R0007
Value
0001
0000
0000
0204
0000
0000
0000
Description
1 = Read
Error Code
Error Location
Rack 2, Slot 4
Read Data
Not Used
Not Used
%M0204
SVC_
REQ
GFK-0467M
CONST
0046
FNC
%R0001
0001
PARM
Chapter 12 Control Functions
12-75
12
Example 2
In this example the BLKMV and two MOVE instructions write the required data to the parameter
block, which starts at %R0001 (specified by the SVCREQ PARM input). When enabled, the
SVCREQ reads the extra status word data from the module in Rack 0, Slot 4 and from the module
in Rack 1, Slot 1. It writes a value of 0005 to the module in Rack 0, Slot 4,and a value of 0009 to
the module in Rack 1, Slot 1. (Note that the modules do not need to be listed in the parameter block
in order by slot numbers.) Data read from the module in Rack 0, Slot 4 will be placed into
%R0008. Data read from the module in Rack 1, Slot 1 will be placed in %R0005.
%M0201
MOVE_
WORD
BLKMV_
WORD
CONST
0003
IN1
CONST
0000
IN2
CONST
0000
IN3
CONST
0101
IN4
CONST
0000
IN5
CONST
0009
IN6
CONST
0004
IN7
Q
%R0001
0003
Q
%R0008
0000
Parameter Block
Address
%R0001
%R0002
%R0003
%R0004
%R0005
%R0006
%R0007
%R0008
%R0009
MOVE_
WORD
IN1
IN1
LEN
0001
%M0201
CONST
0005
CONST
0000
Q
Value
0003
0000
0000
0101
0000
0009
0004
0000
0005
Description
3 = Read/Write
Error Code
Error Location (Rack/Slot)
Rack 1, Slot 1 (1st Module)
Read 1st Module Data
Write 1st Module Data
Rack 0, Slot 4 (2nd Module)
Read 2nd Module Data
Write 2nd Module Data
%R0009
0000
LEN
0001
%M0201
%M0204
SVC_
REQ
12-76
CONST
0046
FNC
%R0001
0003
PARM
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
12
SVCREQ #48: Reboot After Fatal Fault Auto Reset
Compatibility for SVCREQ 48
CPU - This Service Request is supported by firmware release 10.00 (or later version) for Series 9030 CPUs 331, 340, 341, 350, 36x, and 37x.
Software - This Service Request is only supported by VersaPro Version 1.1 (or later version) PLC
software. Logicmaster does not support this feature.
Warning
The Reboot After Fatal Fault feature should not be used (Ignore Fatal
Faults parameter set to Disabled) in applications where an automatic PLC
restart under fault condition could produce an unsafe condition in the
controlled equipment. It is the responsibility of the system designer to
determine whether this feature can be used safely with their equipment.
Failure to follow this warning could result in injury or death to personnel
and/or damage to equipment.
Description
The Reboot After Fatal Fault Service Request lets the PLC automatically resume normal operation
after a fatal fault has occurred. Following the fatal fault, the PLC will automatically reset and
resume execution. The faults will not be cleared, but will be treated as non-fatal. If fatal faults are
present following the power up, the PLC will still be allowed to transition to run mode. This
feature is enabled by the Ignore Fatal Faults (or Fatal Fault Override) parameter in the CPU’s
hardware configuration.
SVCREQ 48 sets the maximum number of retries and the time period during which the retries may
occur. If the number of retries allowed within the time period is exceeded, the CPU mode is set to
STOP/FAULT. If the period is 0, the CPU mode is set to STOP/FAULT when the number of
retries allowed is exceeded.
If the operator cycles power, fatal faults are ignored. The current fault count and time period are
initialized. The total number of fatal faults is unchanged, but the total number of retries is
incremented. System bit %S0021 is set to 1 whenever retry is successful and remains set until all
fatal faults are cleared, or the mode is set to STOP/FAULT.
GFK-0467M
Chapter 12 Control Functions
12-77
12
Table 12-9. Parameter Block for Reboot after Fatal Fault
Location
Field
Meaning
Word 1
Service Request
Status
See Return Status Definition, below.
User program must initialize this word to zero.
Word 2
Unlimited
Retries
0 = Disable (number of retries is set by Word 3)
1 = Enable (Words 3 and 4 ignored)
Word 3
Number of
Retries Allowed
Range is 0 to 128
0 = Automatic Reboot is Disabled
1 to 128 = Maximum number of retries that are allowed to occur within
the period set in Word 4.
Word 4
Retry Period (in
minutes)
Range is 0 to 5940 minutes (99 hours)
0 = No time limit on maximum number of retries set in Word 3. Auto
Reboot will be allowed for the number of retries.
1 to 5940 = Auto Reboot is disabled if the number of retries specified is
exceeded within the period specified.
Table 12-10. Return Status Definitions for Reboot after Fatal Fault
Status
12-78
Description
Notes
Power
Flow
-5
Invalid Retry Period
Valid range is 0 to 5940
-4
Invalid No. of Retries
Valid range is 0 to 128
No
-3
Invalid Unlimited Retries
Must be 0 or 1
No
-2
Configuration Disabled
Ignore Fatal Faults (Fatal Fault Override) option must
be enabled in hardware configuration.
No
0
No Action
Command requires no change
Yes
1
Auto Reset Enabled
Valid command enables reboot after Fatal Fault
Yes
2
Auto Reset Disabled
Valid command disables Reboot after Fatal Fault.
Ignore Fatal Faults remains enabled.
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
No
GFK-0467M
12
SVCREQ 49 Auto Reset Statistics
Service Request 49 provides access to two variables which record total number of fatal faults and
retires that have occurred. The range of these variables is 0 to 65535. These variables do not roll
over if their maximum value is exceeded. (Service Request 48 is used to configure the maximum
number of retries allowed and the time limit during which the retries can occur.)
Table 12-11. Parameter Block for Auto Reset Statistics
Word 1
Service Request Status
See Return Status Definitions below.
User program must initialize this word to zero.
Word 2
Command
0 = Return total number of Fatal Faults and Number
of Retries that have occurred.
1 = Initialize the Total Number of Fatal Faults and
Total Number of Retries to Zero.
Word 3
Returned Value = Total number of
Fatal Faults that have occurred.
User program should initialize to zero.
Word 4
Returned Value = Total number of
Auto Reset Retries
User program should initialize to zero.
Table 12-12. Return Status Definitions for Auto Reset Statistics
Status
Description
-2
Configuration Disabled
-1
1
Notes
Power Flow
Ignore Fatal Faults (Fatal Fault
Override) option must be enabled in
hardware configuration.
No
Invalid Command
Command must be 0 or 1.
No
Normal Status
Valid Command
Yes
CPU Compatibility for SVCREQ 49
This Service Request is supported by Firmware Release 10.00 for the Series 90-30 CPUs 331, 340,
341, 350, 36x, and 37x.
GFK-0467M
Chapter 12 Control Functions
12-79
12
PID
The Proportional plus Integral plus Derivative (PID) control function is the best known general
purpose algorithm for closed loop process control. The Series 90 PID function block compares a
Process Variable (PV) feedback with a desired process Set Point (SP) and updates a Control
Variable (CV) output based on the error.
The block uses PID loop gains and other parameters stored in an array of 40 16 bit words
(discussed on page 12-82) to solve the PID algorithm at the desired time interval. All parameters
are 16 bit integer words for compatibility with 16 bit analog process variables. This allows %AI
memory to be used for input Process Variables and %AQ to be used for output Control Variables.
The example shown below includes typical inputs.
_____
%S00007
|
|
(enable) ——| |—— -| PID_|— (ok) Power flow out if OK
|
|
| IND |
|
|
(set point) %R00010 —|SP CV|— %AQ0001 Control Variable
+21000 |
| +25000
|
|
(process variable) %AI0001 —|PV
|
+20950 |
|
|
|
%M0001 |
|
——| |——— |MAN |
|
|
|
|
%M0002
|
|
——| |——— |UP
|
|
|
|
|
%M0002
|DN
|
——| |——— |
|
|_____|
%R00100
RefArray is 40 %R words
(reference array address)
As scaled 16 integer numbers, many parameters must be defined in either PV counts or units or CV
counts or units. For example, the SP input must be scaled over the same range as PV because the
PID block calculates the error from the difference of these two inputs. The PV and CV counts can
be –32000 or 0 to 32000, matching analog scaling or from 0 to 10000, to display variables as
0.00% to 100.00%. The PV and CV Counts do not have to have the same scaling, in which case
there will be scale factors included in the PID gains.
Note
The PID will not execute more often than once every 10 milliseconds. This could
change your results if you set it up to execute every sweep and the sweep is less
than 10 milliseconds. In such a case, the PID function will not run until enough
sweeps have occurred to accumulate an elapsed time of 10 milliseconds. For
example, if the sweep time is 9 milliseconds, the PID function will execute every
other sweep with an elapsed time of 18 milliseconds for every time it executes.
12-80
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12
Parameters
Parameter
Description
enable
When enabled through a contact, the PID function is performed.
SP
SP is the control loop or process set point. Set using PV Counts, the PID adjusts the
output CV so that PV matches SP (zero error).
PV
Process Variable input from the process being controlled, often a %AI input.
MAN
When energized to 1 (through a contact), the PID block is in MANUAL mode. If this
parameter is not energized (0), the PID block is in automatic mode.
UP
If energized along with MAN, it adjusts the CV up by 1 CV per solution.*
DN
If energized along with MAN, it adjusts the CV down by 1 CV per solution.*
RefArray
Address
Address is the location of the PID control block information (user and internal
parameters). Uses 40 %R words that cannot be shared.
ok
The ok output is energized when the function is performed without error. It is off if
error(s) exist.
CV
CV is the control variable output to the process, often a %AQ analog output.
*Increments (UP parameter) or decremented (DN parameter) by 1 per access of the PID function.
Valid Memory Types
Parameter
flow
enable
•
SP
PV
MAN
•
UP
•
DN
•
%I
%Q
%M
%T
•
•
•
•
•
•
%S
%G
%R
%AI
%AQ
const
•
•
•
•
•
•
•
•
•
•
•
•
•
address
ok
CV
•
GFK-0467M
none
•
•
•
•
•
•
•
•
•
Valid reference or place where power can flow through the function.
Chapter 12 Control Functions
12-81
12
PID Parameter Block
Besides the 2 input words and the 3 Manual control contacts, the PID block uses 13 of the
parameters in the RefArray. These parameters must be set before calling the block. The other
parameters are used by the PLC and are non-configurable. The %Ref shown in the table below is
the same RefArray Address at the bottom of the PID block. The number after the plus sign is the
offset in the array. For example, if the RefArray starts at %R100, the %R113 will contain the
Manual Command used to set the Control Variable and the integrator in Manual mode.
Table 12-13. PID Parameters Overview
12-82
Register
Parameter
Low Bit Units
%Ref+0000
Loop Number
%Ref+0001
Algorithm
%Ref+0002
Sample Period
10 milliseconds
%Ref+0003
Dead Band +
PV Counts
0 (every sweep) to 65535 (10.9 Min).
Use at least 10 for 90-30 PLCs (see Note
on page 12-80).
0 to 32000 (never negative)
%Ref+0004
Dead Band —
PV Counts
–32000 to 0 (never positive)
%Ref+0005
Proportional Gain –Kp
0.01 CV%/PV%
0 to 327.67 %/%
%Ref+0006
Derivative Gain–Kd
0.01 seconds
0 to 327.67 sec
%Ref+0007
Integral Rate–Ki
Repeat/1000 Sec
0 to 32.767 repeat/sec
%Ref+0008
CV Bias/Output Offset
CV Counts
–32000 to 32000 (add to integrator output)
%Ref+0009
Upper Clamp
CV Counts
–32000 to 32000 (>%Ref+10) output limit
%Ref+0010
Lower Clamp
CV Counts
–32000 to 32000 (<%Ref+09) output limit
%Ref+0011
Minimum Slew Time
Second/Full
Travel
0 (none) to 32000 sec to move 32000 CV
%Ref+0012
Config Word
Low 5 bits used
%Ref+0013
Manual Command
Bit 0 to 2 for Error +/–, OutPolarity,
Deriv.
Tracks CV in Auto or Sets CV in Manual
%Ref+0014
Control Word
%Ref+0015
Internal SP
%Ref+0016
Internal CV
N/A; set and
Non-configurable
maintained by the
PLC
%Ref+0017
Internal PV
N/A; set and
Non-configurable
maintained by the
PLC
%Ref+0018
Output
N/A; set and
Non-configurable
maintained by the
PLC
Integer
Range of Values
0 to 255 (for user display only)
N/A; set and
maintained by the Non-configurable
PLC
CV Counts
Maintained by the PLC maintained unless set otherwise: low
PLC, unless Bit 1 bit sets Override if 1 (see description in
is set.
the “PID Parameter Details” table on page
12-85)
N/A; set and
Non-configurable
maintained by the
PLC
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12
Table 12-13. PID Parameters Overview - Continued
Register
Parameter
Low Bit Units
Range of Values
%Ref+0019
Diff Term Storage
N/A; set and
Non-configurable
maintained by the
PLC
%Ref+0020
and
%Ref+0021
Int Term Storage
N/A; set and
Non-configurable
maintained by the
PLC
%Ref+0022
Slew Term Storage
N/A; set and
Non-configurable
maintained by the
PLC
%Ref+0023
Clock
%Ref+0024
%Ref+0025
(time last executed)
%Ref+0026
Y Remainder Storage
N/A; set and
maintained by
the PLC
Non-configurable
N/A; set and
maintained by the Non-configurable
PLC
%Ref+0027
Lower Range for SP, PV PV Counts
%Ref+0028
Upper Range for SP, PV PV Counts
–32000 to 32000 (>%Ref+28) for
display
–32000 to 32000 (<%Ref+27) for
display
%Ref+0029
+•
Reserved for internal use N/A
Non-configurable
Reserved for external use N/A
Non-configurable
%Ref+0034
%Ref+0035
•
%Ref+0039
The RefArray array must consist of %R registers on the 90-30 PLC. Note that every PID block call
must use a different 40-word array even if all 13 user parameters are the same because other words
in the array are used for internal PID data storage. Make sure the array does not extend beyond the
end of memory.
To configure operating parameters, select the PID function and press F10 to zoom in to a screen
displaying User Parameters; then use arrow keys to select fields and type in desired values. You
can use 0 for most default values, except the CV Upper Clamp, which must be greater than the CV
Lower Clamp for the PID block to operate. Note that the PID block does not pass power if there is
an error in User Parameters, so monitor with a temporary coil while modifying data.
Once suitable PID values have been chosen, they should be defined as constants in the BLKMOV
so that they can be used to reload default PID user parameters if needed.
GFK-0467M
Chapter 12 Control Functions
12-83
12
Operation of the PID Instruction
Normal Automatic operation is to call the PID block every sweep with power flow to Enable and
no power flow to Manual input contacts. The block compares the current PLC elapsed time clock
with the last PID solution time stored in the internal RefArray. If the time difference is greater than
the sample period defined in the third word (%Ref+2) of the RefArray, the PID algorithm is solved
using the time difference and both the last solution time and Control Variable output are updated.
In Automatic mode, the output Control Variable is placed in the Manual Command parameter
%Ref+13.
If power flow is provided to both Enable and Manual input contacts, the PID block is placed in
Manual mode and the output Control Variable is set from the Manual Command parameter
%Ref+13. If either the UP or DN inputs have power flow, the Manual Command word is
incremented or decremented by one CV count every PID solution. For faster manual changes of the
output Control Variable, it is also possible to add or subtract any CV count value directly to/from
the Manual Command word.
The PID block uses the CV Upper and CV Lower Clamp parameters to limit the CV output. If a
positive Minimum Slew Time is defined, it is used to limit the rate of change of the CV output. If
either the CV amplitude or rate limit is exceeded, the value stored in the integrator is adjusted so
that CV is at the limit. This anti-reset windup feature (defined on page 12-87) means that even if
the error tried to drive CV above (or below) the clamps for a long period of time, the CV output
will move off the clamp as soon as the error term changes sign.
This operation, with the Manual Command tracking CV in Automatic mode and setting CV in
Manual mode, provides a bumpless transfer between Automatic and Manual modes. The CV Upper
and Lower Clamps and the Minimum Slew Time still apply to the CV output in Manual mode and
the internal value stored in the integrator is updated. This means that if you were to step the Manual
Command in Manual mode, the CV output will not change any faster that the Minimum Slew Time
(Inverse) rate limit and will not go above or below the CV Upper or CV Lower Clamp limits.
Note
A specific PID function should not be called more than once per sweep.
The following table provides more details about the parameters discussed briefly in Table 12-3.
The number in parentheses after each parameter name is the offset in the RefArray.
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12
Table 12-14. PID Parameter Details
Data Item
Loop Number
(00)
Description
This is an optional parameter available to identify a PID block. It is an unsigned integer that
provides a common identification in the PLC with the loop number defined by an operator interface
device. The loop number is displayed under the block address when logic is monitored from the
Logicmaster 90-30/20/Micro software.
Algorithm (01)
An unsigned integer that is set by the PLC to identify what algorithm is being used by the
function block. The ISA algorithm is defined as algorithm 1, and the independent algorithm is
identified as algorithm 2.
Sample Period
The shortest time, in 10 millisecond increments, between solutions of the PID algorithm. For example,
use a 10 for a 100 millisecond sample period. If it is 0, the algorithm is solved every time the block is
called (see section below on PID block scheduling).
(02)
The PID algorithm is solved only if the current PLC elapsed time clock is at or later than the last PID
solution time plus this Sample Period. Remember, that the 90-30 will not use a solution time less than 10
milliseconds (see Note on page 12-80); so sweeps will be skipped for smaller sweep times. This function
compensates for the actual time elapsed since the last execution, within 100 microseconds. If this value is
set to 0, the function is executed each time it is enabled; however, it is restricted to a minimum of 10
milliseconds as noted above.
Dead Band
(+/—)
(03/04)
Proportional
Gain–Kp
(05)
Derivative
Gain–Kd
(06)
Integral Rate
Gain–Ki
(07)
CV Bias/Output
Offset
(08)
GFK-0467M
INT values defining the upper (+) and lower (–) Dead Band limits in PV Counts. If no Dead Band is
required, these values must be 0. If the PID Error (SP – PV) or (PV – SP) is above the (–) value and below
the (+) value, the PID calculations are solved with an Error of 0. If non-zero, the (+) value must be greater
than 0 and the (–) value less than 0 or the PID block will not function. You should leave these at 0 until the
PID loop gains are setup or tuned. After that, you might want to add Dead Band to avoid small CV output
changes due to small variations in error, perhaps to reduce mechanical wear.
This INT number, called the Controller gain, Kc, in the ISA version, determines the change in CV in CV
Counts for a 100 PV Count change in the Error term. It is displayed as 0.00 %/% with an implied decimal
point of 2 . For example, a Kp entered as 450 will be displayed as 4.50 and will result in a Kp*Error/100
or 450*Error/100 contribution to the PID Output. Kp is generally the first gain set when adjusting a PID
loop.
This INT number determines the change in CV in CV Counts if the Error or PV changes 1 PV Count
every 10 milliseconds. Entered as a time with the low bit indicating 10 milliseconds, it is displayed as 0.00
Seconds with an implied decimal point of 2. For example, a Kd entered as 120 will be displayed as 1.20
Sec and will result in a Kd * delta Error/delta time or 120*4/3 contribution to the PID Output if Error was
changing by 4 PV Counts every 30 milliseconds. Kd can be used to speed up a slow loop response, but is
very sensitive to PV input noise.
This INT number determines the change in CV in CV Counts if the Error were a constant 1 PV Count. It is
displayed as 0.000 Repeats/Sec with an implied decimal point of 3. For example, a Ki entered as 1400 will
be displayed as 1.400 Repeats/Sec and will result in a Ki * Error *dt or 1400 * 20 * 50/1000 contribution
to PID Output for an Error of 20 PV Counts and a 50 millisecond PLC sweep time (Sample Period of 0).
Ki is usually the second gain set after Kp.
An INT value in CV Counts added to the PID Output before the rate and amplitude clamps. It can
be used to set non-zero CV values if only Kp Proportional gains are used, or for feed forward control of
this PID loop output from another control loop.
Chapter 12 Control Functions
12-85
12
Table 12-14. PID Parameter Details - Continued
Data Item
Description
CV Upper and
Lower Clamps
(09/10)
INT values in CV Counts that define the highest and lowest value for CV. These values are required and
the Upper Clamp must have a more positive value than the Lower Clamp, or the PID block will not work.
These are usually used to define limits based on physical limits for a CV output. They are also used to
scale the Bar Graph display for CV for the LM90 or ADS PID display. The block has anti-reset windup to
modify the integrator value when a CV clamp is reached.
Minimum Slew
Time (11)
A positive value to define the minimum number of seconds for the CV output to move from 0 to full travel
of 100% or 32000 CV Counts. It is an inverse rate limit on how fast the CV output can be changed. If
positive, CV can not change more than 32000 CV Counts times Delta Time (seconds) divided by
Minimum Slew Time. For example, if the Sample Period was 2.5 seconds and the Minimum Slew Time is
500 seconds, CV can not change more than 32000*2.5/500 or 160 CV Counts per PID solution. As with
the CV Clamps, there is an anti-windup feature that adjusts the integrator value if the CV rate limit is
exceeded. If Minimum Slew Time is 0, there is no CV rate limit. Make sure you set Minimum Slew Time
to 0 while you are tuning or adjusting PID loop gains.
Config Word
The low 5 bits of this word are used to modify three standard PID settings. The other bits should be set to
0. Set the low bit to 1 to modify the standard PID Error Term from the normal (SP – PV) to (PV – SP),
reversing the sign of the feedback term. This is for Reverse Acting controls where the CV must go down
when the PV goes up. Set the second bit to a 1 to invert the Output Polarity so that CV is the negative of
the PID output rather than the normal positive value. Set the fourth bit to 1 to modify the Derivative
Action from using the normal change in the Error term to the change in the PV feedback term.
The low 5 bits in the Config Word are defined in detail below:
Bit 0 =
Error Term. When this bit is set to 0, the error term is SP — PV.
When this bit is set to 1, the error term is PV — SP.
Bit 1 =
Output Polarity. When this bit is set to 0, the CV output represents the output of the
PID calculation. When it is set to 1, the CV output represents the negative of the
output of the PID calculation.
Bit 2 =
Derivative action on PV. When this bit is set to 0, the derivative action is applied to
the error term. When it is set to 1, the derivative action is applied to PV. All
remaining bits should be zero.
Bit 3 =
Deadband action. When the Deadband action bit is set to zero, then no deadband
action is chosen. If the error is within the deadband limits, then the error is forced
to be zero. Otherwise the error is not affected by the deadband limits. If the
Deadband action bit is set to one, then deadband action is chosen. If the error is
within the deadband limits, then the error is forced to be zero. If, however, the
error is outside the deadband limits, then the error is reduced by the deadband
limit (error = error – deadband limit).
Bit 4 =Anti-reset windup action. When this bit is set to zero, the anti-reset windup action
uses a reset back calculation. When the output is clamped, this replaces the
accumulated Y remainder value (defined on page 12-87) with whatever value is necessary
to produce the clamped output exactly. When the bit is set to one, this replaces the
accumulated Y term with the value of the Y term at the start of the calculation. In this
way, the pre-clamp Y value is held as long as the output is clamped.
NOTE: The anti-reset windup action bit is only available on release 6.50 or later 90-30
CPUs.
Remember that the bits are set in powers of 2. For example, to set Config Word to 0 for default PID
configuration, you would add 1 to change the Error Term from SP–PV to PV–SP, or add 2 to change the
Output Polarity from CV = PID Output to CV = – PID Output, or add 4 to change Derivative Action from
Error rate of change to PV rate of change, etc.
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12
Table 12-14. PID Parameter Details - Continued
Data Item
Manual
Command
(13)
Control Word
(14)
Description
This is an INT value set to the current CV output while the PID block is in Automatic mode. When the
block is switched to Manual mode, this value is used to set the CV output and the internal value of the
integrator within the Upper and Lower Clamp and Slew Time limits.
This is an internal parameter that is normally left at 0.
If the Override low bit is set to 1, this word and other internal SP, PV and CV parameters must be used for
remote operation of this PID block (see below). This allows remote operator interface devices, such as a
computer, to take control away from the PLC program. Caution: if you do not want this to happen, make
use the Control Word is set to 0. If the low bit is 0, the next 4 bits can be read to track the status of the PID
input contacts as long as the PID Enable contact has power. A discrete data structure with the first five bit
positions in the following format:
Bit: Word Value: Function: Status or External Action if Override bit set to 1:
0
1
Override If 0, monitor block contacts below. If 1, set
them externally.
1
2
Manual/ If 1, block is in Manual mode; other numbers
Auto
it is in Automatic mode.
2
4
Enable
Should normally be 1; otherwise block is
never called.
3
8
UP/Raise If 1 and Manual (Bit 1) is 1, CV is being
incremented every solution.
4
16
DN/LowerIf 1 and Manual (Bit 1) is 1, CV is
being incremented every solution.
SP (15)
(Non-configurable–set and maintained by the PLC) Tracks SP in; must be set externally if Override = 1.
CV (16)
(Non-configurable–set and maintained by the PLC) Tracks CV out.
PV (17)
(Non-configurable–set and maintained by the PLC) Tracks PV in; must be set externally if Override bit =
1.
Output (18)
(Non-configurable–set and maintained by the PLC) This is a signed word
value representing the output of the function block before the application of
the optional inversion. If no output inversion is configured and the output
polarity bit in the control word is set to 0, this value will equal the CV output. If inversion is selected and
the output polarity bit is set to 1, this value will equal the negative of the CV output.
Diff Term
Storage (19)
Used internally for storage of intermediate values. Do not write to this location.
Int Term
Storage (20/21)
Used internally for storage of intermediate values. Do not write to this location.
Slew Term
Storage (22)
Used internally for storage of intermediate values. Do not write to this location.
Clock (23–25)
Internal elapsed time storage (time last PID executed). Do not write to these locations.
Y Remainder (26) Holds remainder for integrator division scaling for 0 steady state error.
Lower and
Upper Range
(27/28)
Optional INT values in PV Counts that define the highest and lowest display value for the SP and PV
Logicmaster Zoom key horizontal bar graph and ADS PID faceplate display.
Reserved (29–34 29–34 are reserved for internal use; 35–39 are reserved for external use. They are reserved for GE Fanuc
and 35–39)
use, and cannot be used for other purposes.
GFK-0467M
Chapter 12 Control Functions
12-87
12
Internal Parameters in RefArray
As described in Table 12-3 on the previous pages, the PID block reads 13 user parameters and uses
the rest of the 40 word RefArray for internal PID storage. Normally you would not need to change
any of these values. If you are calling the PID block in Auto mode after a long delay, you might
want to use SVC_REQ #16 to load the current PLC elapsed time clock into %Ref+23 to update the
last PID solution time to avoid a step change on the integrator. If you have set the Override low bit
of the Control Word (%Ref+14) to 1, the next four bits of the Control Word must be set to control
the PID block input contacts (as described in Table 12-3 on the previous pages), and the Internal SP
and PV must be set as you have taken control of the PID block away from the ladder logic.
PID Algorithm Selection (PIDISA or PIDIND) and Gains
The PID block can be programmed selecting either the Independent (PID_IND) term or standard
ISA (PID_ISA) versions of the PID algorithm. The only difference in the algorithms is how the
Integral and Derivative gains are defined. To understand the difference, you need to understand the
following:
Both PID types calculate the Error term as SP – PV (Reverse Acting), which can be changed to
Direct Acting mode (PV – SP) by setting the Error Term to 1. The Error Term is the low bit (0bit) in the Config. Word (%Ref+0012). In a Direct Acting proportional (P) loop, an increase in the
Process Variable (PV) causes an increase in the output (CV). In a Reverse Acting proportional (P)
loop, an increase in the Process Variable (PV) causes a decrease in the output (CV). Introducing
the integral term (I) changes the behavior. In a Direct Acting PI loop, the output (CV) will increase
when the process variable (PV) is greater than the setpoint (SP). In a Reverse Acting PI loop, the
output (CV) will decrease when the Process Variable (PV) is greater than the Setpoint (SP).
Direct Acting: Error = measurement – setpoint (PV-SP), Error Term = 1
Reverse Acting: Error = setpoint – measurement (SP-PV), Error Term = 0
Note. Direct Acting is sometimes referred to as Forward Acting.
The Derivative is normally based on the change of the Error term since the last PID solution, which
may cause a large change in the output if the SP value is changed. If this is not desired, the third bit
of the Config Word can be set to 1 to calculate the Derivative based on the change of the PV. The
dt (or Delta Time) is determined by subtracting the last PID solution clock time for this block from
the current PLC elapsed time clock.
dt = Current PLC Elapsed Time clock – PLC Elapsed Time Clock at Last PID solution
Derivative = (Error – previous Error)/dt
or (PV – previous PV)/dt if 3rd bit of Config
Word set to 1
The Independent term PID (PID_IND) algorithm calculates the output as:
PID Output = Kp * Error + Ki * Error * dt + Kd * Derivative + CV Bias
The standard ISA (PID_ISA) algorithm has a different form:
PID Output = Kc * (Error + Error * dt/Ti + Td * Derivative) + CV Bias
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GFK-0467M
12
where Kc is the controller gain, and Ti is the Integral time and Td is the Derivative time. The
advantage of ISA is that adjusting the Kc changes the contribution for the integral and derivative
terms as well as the proportional one, which may make loop tuning easier. If you have PID gains in
terms or Ti and Td, use
Kp = Kc
Ki = Kc/Ti
and
Kd = Kc/Td
to convert them to use as PID User Parameter inputs.
The CV Bias term above is an additive term separate from the PID components. It may be required
if you are using only Proportional Kp gain and you want the CV to be a non-zero value when the
PV equals the SP and the Error is 0. In this case, set the CV Bias to the desired CV when the PV is
at the SP. CV Bias can also be used for feed forward control where another PID loop or control
algorithm is used to adjust the CV output of this PID loop.
If an Integral Ki gain is used, the CV Bias would normally be 0 as the integrator acts as an
automatic bias. Just start up in Manual mode and use the Manual Command word (%Ref+13) to set
the integrator to the desired CV, then switch to Automatic mode. This also works if Ki is 0, except
the integrator will not be adjusted based on the Error after going into Automatic mode.
The following diagram shows how the PID algorithms work:
a43646
SP
PROPORTIONAL
TERM - Kp
Error Sign
DEAD
BAND
PV
INTEGRAL - Ki
TIME
BIAS
SLEW
LIMIT
UPPER/LOWER
CLAMP
POLARITY
CV
Deriv Action
VALUE
TIME
DERIVATIVE
TERM - Kd
Figure 12-4. Independent Term Algorithm (PIDIND)
The ISA Algorithm (PIDISA) is similar except the Kp gain is factored out of Ki and Kd so that the
integral gain is Kp * Ki and derivative gain is Kp * Kd. The Error sign, DerivAction and Polarity
are set by bits in the Config Word user parameter.
CV Amplitude and Rate Limits
The block does not send the calculated PID Output directly to CV. Both PID algorithms can
impose amplitude and rate of change limits on the output Control Variable. The maximum rate of
change is determined by dividing the maximum 100% CV value (32000) by the Minimum Slew
Time, if specified as greater than 0. For example, if the Minimum Slew Time is 100 seconds, the
rate limit will be 320 CV counts per second. If the dt solution time was 50 milliseconds, the new
CV output can not change more than 320*50/1000 or 16 CV counts from the previous CV output.
The CV output is then compared to the CV Upper and CV Lower Clamp values. If either limit is
exceeded, the CV output is set to the clamped value. If either rate or amplitude limits are exceeded
modifying CV, the internal integrator value is adjusted to match the limited value to avoid reset
windup.
Finally, the block checks the Output Polarity (2nd bit of the Config Word %Ref+12) and changes
the sign of the output if the bit is 1.
CV = Clamped PID Output
GFK-0467M
Chapter 12 Control Functions
or – Clamped PID Output if Output Polarity bit set
12-89
12
If the block is in Automatic mode, the final CV is placed in the Manual Command %Ref+13. If the
block is in Manual mode, the PID equation is skipped as CV is set by the Manual Command, but
all the rate and amplitude limits are still checked. That means that the Manual Command can not
change the output above the CV Upper Clamp or below the CV Lower Clamps and the output can
not change faster than the Minimum Slew Time allowed.
Sample Period and PID Block Scheduling
The PID block is a digital implementation of an analog control function, so the dt sample time in
the PID Output equation is not the infinitesimally small sample time available with analog controls.
The majority of processes being controlled can be approximated as a gain with a first or second
order lag, possibly with a pure time delay. The PID block sets a CV output to the process and uses
the process feedback PV to determine an Error to adjust the next CV output. A key process
parameter is the total time constant, which is how fast does the PV respond when the CV is
changed. As discussed in the Setting Loop Gains section below, the total time constant, Tp+Tc, for
a first order system is the time required for PV to reach 63% of its final value when CV is stepped.
The PID block will not be able to control a process unless its Sample Period is well under half the
total time constant. Larger Sample Periods will make it unstable.
The Sample Period should be no bigger than the total time constant divided by 10 (or down to 5
worst case). For example, if PV seems to reach about 2/3 of its final value in 2 seconds, the Sample
Period should be less than 0.2 seconds, or 0.4 seconds worst case. On the other hand, the Sample
Period should not be too small, such as less than the total time constant divided by 1000, or the Ki
* Error * dt term for the PID integrator will round down to 0. For example, a very slow process that
takes 10 hours or 36000 seconds to reach the 63% level should have a Sample Period of 40
seconds or longer.
Unless the process is very fast, it is not usually necessary to use a Sample Period of 0 to solve the
PID algorithm every PID sweep. If many PID loops are used with a Sample Period greater than the
sweep time, there may be wide variations in PLC sweep time if many loops end up solving the
algorithm at the same time. The simple solution is to sequence a one or more 1 bits through an
array of bits set to 0 that is being used to enable power flow to individual PID blocks.
12-90
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
12
Determining the Process Characteristics
The PID loop gains, Kp, Ki and Kd, are determined by the characteristics of the process being
controlled. Two key questions when setting up a PID loop are:
1.
How big is the change in PV when CV changes by a fixed amount, or what is the open loop
gain?
2.
How fast does the system respond, or how quick does PV change after the CV output is
stepped?
Many processes can be approximated by a process gain, first or second order lag and a pure time
delay. In the frequency domain, the transfer function for a first order lag system with a pure time
delay is:
PV(s)/CV(s) = G(s) = K * e **(–Tp s)/(1 + Tc s)
Plotting a step response at time t0 in the time domain provides an open loop unit reaction curve:
CV Unit Step Output to Process
1
PV Unit Reaction Curve Input from Process
a45709
K
0.632K
t0
t0
Tp
Tc
The following process model parameters can be determined from the PV unit reaction curve:
K
Process open loop gain = final change in PV/change in CV at time t0
(Note no subscript on K)
Tp
Process or pipeline time delay or dead time after t0 before the process output PV
starts moving
Tc
First order Process time constant, time required after Tp for PV to reach 63.2% of the
final PV
Usually the quickest way to measure these parameters is by putting the PID block in Manual mode
and making a small step in CV output, by changing the Manual Command %Ref+13, and plotting
the PV response over time. For slow processes, this can be done manually, but for faster processes
a chart recorder or computer graphic data logging package will help. The CV step size should be
large enough to cause an observable change in PV, but not so large that it disrupts the process
being measured. A good size may be from 2 to 10% of the difference between the CV Upper and
CV Lower Clamp values .
GFK-0467M
Chapter 12 Control Functions
12-91
12
Setting User Parameters Including Tuning Loop Gains
As all PID parameters are totally dependent on the process being controlled, there are no
predetermined values that will work, however, it is usually a simple, iterative procedure to find
acceptable loop gain.
12-92
1.
Set all the functional block parameters to 0, then set the CV Upper and CV Lower Clamps to
the highest and lowest CV expected. Set the Sample Period to the estimated process time
constant (above)/10 to 100.
2.
Put block in Manual mode and set Manual Command (%Ref+13) at different values to check if
CV can be moved to Upper and Lower Clamp. Record PV value at some CV point and load it
into SP.
3.
Set a small gain, such as 100 * Maximum CV/Maximum PV, into Kp and turn off Manual
mode. Step SP by 2 to 10% of the Maximum PV range and observe PV response. Increase Kp
if PV step response is too slow or reduce Kp if PV overshoots and oscillates without reaching a
steady value.
4.
Once a Kp is found, start increasing Ki to get overshooting that dampens out to a steady value
in 2 to 3 cycles. This may required reducing Kp. Also try different step sizes and CV operating
points.
5.
After suitable Kp and Ki gains are found, try adding Kd to get quicker responses to input
changes providing it doesn’t cause oscillations. Kd is often not needed and will not work with
noisy PV.
6.
Check gains over different SP operating points and add Dead Band and Minimum Slew Time
if needed. Some Reverse Acting processes may need setting Config Word Error Sign or
Polarity bits.
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
12
Setting Loop Gains — Ziegler and Nichols Tuning Approach
Once the three process model parameters, K, Tp and Tc, are determined, they can be used to
estimate initial PID loop gains. The following approach, developed by Ziegler and Nichols in the
1940’s, is designed to provide good response to system disturbances with gains producing a
amplitude ratio of 1/4. The amplitude ratio is the ratio of the second peak over the first peak in the
closed loop response.
1.
Calculate the Reaction rate:
R = K/Tc
2.
For Proportional control only, calculate Kp as
Kp = 1/(R * Tp) = Tc/(K * Tp)
3.
For Proportional and Integral control, use
Kp = 0.9/(R * Tp) = 0.9 * Tc/(K * Tp)
Ki = 0.3 * Kp/Tp
4.
For Proportional, Integral and Derivative control, use
Kp = G/(R * Tp)
Ki = 0.5 * Kp/Tp
Kd = 0.5 * Kp * Tp
5.
where G is from 1.2 to 2.0
Check that the Sample Period is in the range (Tp + Tc)/10 to (Tp + Tc)/1000
Another approach, the “Ideal Tuning” procedure, is designed to provide the best response to SP
changes, delayed only by the Tp process delay or dead time.
Kp = 2 * Tc/(3 * K * Tp)
Ki = Tc
Kd = Ki/4
if Derivative term is used
Once initial gains are determined, they must be converted to integer User Parameters. To avoid
scaling problems, the Process gain, K, should be calculated as a change in input PV Counts divided
by the output step change in CV Counts and not in process PV or CV engineering units. All times
should also be specified in seconds. Once Kp, Ki and Kd are determined, Kp and Kd can be
multiplied by 100 and entered as integer while Ki can be multiplied by 1000 and entered into the
User Parameter %RefArray.
GFK-0467M
Chapter 12 Control Functions
12-93
12
Sample PID Call
The following example has a Sample Period of 100 milliseconds, a Kp gain of 4.00 and a Ki gain
of 1.500. The Set Point is stored in %R1 with the Control Variable output in %AQ2 and the
Process Variable returned in %AI3. CV Upper and CV Lower Clamps must be set, in this case to
20000 and 400, and an optional small Dead Band of +5 and –5 has been included. The 40 word
RefArray starts in %R100. Closing the %M0006 contact enables a pair of BLKMV instructions,
which set the initial parameter values by copying constants into the 14 words starting at %R102
(%Ref+2). (Note: to optimize parameters during the tuning process, access parameters by placing
the Logicmaster cursor on the PID instruction and pressing the F10 key, which is the Zoom key.)
The block can be switched to Manual mode with %M0001 so that the Manual Command, %R0113,
can be adjusted. Bits %M0004 or %M0005 can be used to increase or decrease %R0113 and the
PID CV and integrator by 1 every 100 millisecond solution. For faster manual operation, bits
%M0002 and %M0003 can be used to add or subtract the value in %R0002 to/from %R0113 every
PLC sweep. The %T0001 output is on when the PID is OK. Note that some of the registers in the
40-register parameter block are not included either because they are not used in this example, or
they are not configurable because they are used by the PLC system. For additional parameter
information, see Table 12-8.
12-94
Address
Value
Description
%R0102
+00010
Sample Period
%R0103
+00005
Dead Band +
%R0104
+00005
Dead Band −
%R0105
+00400
Proportional Gain (Kp)
%R0106
+00000
Derivative Gain (Kd)
%R0107
+01500
Integral Gain (Ki)
%R0108
+00000
CV Bias/Output Offset
%R0109
+20000
Upper Clamp
%R0110
+00400
Lower Clamp
%R0111
+00000
Minimum Slew Time
%R0112
+00000
Config. Word
%R0113
+00000
Manual Command
%R0114
+00000
Control Word
%R0115
+00000
Internal SP (Non-Configurable)
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
12
|
_____
_____
_____
| %M0006 |
|
|
|
|
|
|——| |———| BLK_|—————————|BLKMV|—————————————————|BLKMV|–
|
|
|
|
|
|
|
|
| CLR_|
| INT |
| INT |
|
| WORD|
|
|
|
|
|%R00100—|IN
| CONST —|IN1 Q|—%R00102 CONST —|IN1 Q|— %R00109
|
| LEN | +00010 |
|
+20000 |
|
|
|00035|
|
|
|
|
|
|_____| CONST —|IN2 |
CONST —|IN2 |
|
+00005 |
|
+00400 |
|
|
|
|
|
|
|
CONST —|IN3 |
CONST —|IN3 |
|
+00005 |
|
+00000 |
|
|
|
|
|
|
|
CONST —|IN4 |
CONST —|IN4 |
|
+00400 |
|
+00000 |
|
|
|
|
|
|
|
CONST —|IN5 |
CONST —|IN5 |
|
+00000 |
|
+00000 |
|
|
|
|
|
|
|
CONST —|IN6 |
CONST —|IN6 |
|
+01500 |
|
+00000 |
|
|
|
|
|
|
|
CONST —|IN7 |
CONST —|IN7 |
|
+00000 |_____|
+00000 |_____|
|
|
_____
|ALW_ON
|
| %T0001
|——| |———————————————————————————————————————————| PID_|——( )——
|
| IND |
|
|
|
|
%R0001—|SP CV|– %AQ002
|
|
|
|
|
|
|
%AI0003—|PV
|
|
|
|
|%M0001
|
|
|——| |———————————————————————————————————————————|MAN |
|
|
|
|
|
| %M0004 |
|
|
|——| |————|UP
|
|
|
|
|
|
| %M0005 |
|
|
——| |————|DN
|
|
|_____|
|
|
%R00100
|
_____
|%M0002 |
|
|——| |———| ADD_|————
|
| INT |
|
|
|
|%R00113—|I1 Q|— %R00113
|
|
|
|
|
|
| %R0002—|I2
|
|
|
|
|
|_____|
|
|
_____
|%M0003 |
|
|——| |———| SUB_|—
|
| INT |
|
|
|
|%R00113—|I1 Q|— %R00113
|
|
|
| %R0002—|I2
|
|
|
|
|
|_____|
GFK-0467M
Chapter 12 Control Functions
12-95
Appendix Instruction Timing
A
The Series 90-30, 90-20, and Micro PLCs support many different functions and function blocks.
This appendix contains tables showing the memory size in bytes and the execution time in
microseconds for each function. Memory size is the number of bytes required by the function in a
ladder diagram application program.
Two execution times are shown for each function:
Execution Time
Description
Enabled
Time required to execute the function or function block when power flows
into and out of the function. Typically, best-case times are when the data
used by the block is contained in user RAM (word-oriented memory) and not
in the discrete memory.
Disabled
Time required to execute the function when power flows into the function or
function block; however, it is in an inactive state, as when a timer is held in
the reset state.
Note
Timers and counters are updated each time they are encountered in the logic,
timers by the amount of time consumed by the last sweep and counters by one
count.
Note
For the 350, 351, 352, and 360 PLC CPUs, times are identical except for the
MOVE instruction, which is different for the 350 CPU—refer to the note at the
bottom of the table on page A-6.
GFK-0467M
A-1
A
Table A-1. Instruction Timing, Standard Models
Function
Group
Timers
Counters
Math
Enabled
Function
313
331
340/41
Increment
311
313
331
340/41
311
313
331
340/41
Size
On-Delay Timer
Off-Delay Timer
Timer
Up Counter
Down Counter
Addition (INT)
146
98
122
137
136
76
81
47
76
70
70
47
80
44
75
69
69
46
42
23
40
36
37
24
105
116
103
130
127
41
39
63
54
63
61
0
38
58
53
62
61
1
21
32
30
33
31
0
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
15
9
15
11
11
13
Addition (DINT)
90
60
60
34
41
1
0
0
–
–
–
–
13
Subtraction (INT)
75
46
45
25
41
0
1
0
–
–
–
–
13
Subtraction (DINT)
92
62
62
34
41
1
0
0
–
–
–
–
13
Multiplication (INT)
79
49
50
28
41
0
1
0
–
–
–
–
13
Multiplication (DINT)
Division (INT)
108
79
80
51
101
50
43
27
41
41
1
0
0
1
0
0
–
–
–
–
–
–
–
–
13
13
Division (DINT)
375
346
348
175
41
1
0
0
–
–
–
–
13
78
51
49
27
41
0
1
0
–
–
–
–
13
134
103
107
54
41
1
0
0
–
–
–
–
13
Modulo Division (INT)
Modulo Div (DINT)
Relational
311
Disabled
Square Root (INT)
153
124
123
65
42
0
1
0
–
–
–
–
9
Square Root (DINT)
Equal (INT)
268
66
239
35
241
36
120
19
42
41
0
1
0
1
1
0
–
–
–
–
–
–
–
–
9
9
9
Equal (DINT)
86
56
54
29
41
1
0
0
–
–
–
–
Not Equal (INT)
67
39
35
22
41
1
1
0
–
–
–
–
9
Not Equal (DINT)
81
51
51
28
41
1
0
0
–
–
–
–
9
Greater Than (INT)
64
33
35
20
41
1
1
0
–
–
–
–
9
Greater Than (DINT)
Greater Than/Eq (INT)
89
64
59
36
58
34
32
19
41
41
1
1
0
1
0
0
–
–
–
–
–
–
–
–
9
9
57
Greater Than/Eq (DINT)
87
58
Less Than (INT)
66
35
Less Than (DINT)
87
57
Less Than/Equal (INT)
66
36
34
Less Than/Equal (DINT)
Range (INT)
86
92
57
58
56
Range(DINT)
106
75
93
60
Range(WORD)
54
57
54
30
41
1
0
0
–
–
–
–
9
19
41
1
1
0
–
–
–
–
9
30
41
1
1
0
–
–
–
–
9
21
41
1
1
0
–
–
–
–
9
31
29
41
46
1
1
1
0
0
1
–
–
–
–
–
–
–
–
9
15
37
45
0
0
0
–
–
–
–
15
29
0
0
0
0
–
–
–
–
15
Notes: 1. Time (in microseconds) is based on Release 5.01 of Logicmaster 90-30/20 software for Models 311, 313, 340, and 341 CPUs (Release 7 for the 331).
2. For table functions, increment is in units of length specified.; for bit operation functions, microseconds/bit.; for data move functions, microseconds/number
of bits or words.
3. Enabled time for single length units of type %R, %AI, and %AQ.
4. COMMREQ time has been measured between CPU and HSC.
5. DOIO is the time to output values to discrete output module.
6. Where there is more than one possible case, the time indicated above represents the worst possible case.
A-2
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
A
Table A-1. Instruction Timing, Standard Models-Continued
Function
Enabled
Group
Bit
Operation
Data Move
Table
Function
Logical AND
Logical OR
Disabled
Increment
311
313
331
340/41
311
313
331
340/41
311
313
331
340/41
Size
67
68
37
38
37
38
22
21
42
42
0
0
0
0
1
1
–
–
–
–
–
–
–
–
13
13
13
Logical Exclusive OR
66
38
37
20
42
0
1
1
–
–
–
–
Logical Invert, NOT
62
32
31
17
42
0
1
1
–
–
–
–
9
Shift Bit Left
139
89
90
47
74
26
23
13
11.61
11.61
12.04
6.29
15
Shift Bit Right
Rotate Bit Left
135
156
87
127
85
126
45
65
75
42
26
1
24
1
13
0
11.63
11.70
11.62
11.78
12.02
12.17
6.33
6.33
15
15
Rotate Bit Right
146
116
116
62
42
1
1
0
11.74
11.74
12.13
6.27
15
Bit Position
102
72
49
38
42
1
0
0
–
–
–
–
13
Bit Clear
68
38
35
21
42
1
1
1
–
–
–
–
13
Bit Test
79
49
51
28
41
0
0
1
–
–
–
–
13
Bit Set
Masked Compare (WORD)
67
217
37
154
37
42
107
0
44
0
39
0
21
–
–
–
–
–
–
–
–
13
25
Masked Compare (DWORD)
232
169
141
156
20
74
83
108
44
39
22
–
–
–
–
25
Move (INT)
68
37
39
20
43
0
0
0
1.62
1.62
5.25
1.31
13
Move (BIT)
94
62
64
35
42
0
0
0
12.61
12.64
12.59
6.33
13
Move (WORD)
67
37
40
20
41
0
0
0
1.62
1.63
5.25
1.31
13
Block Move (INT)
76
48
50
28
59
30
30
16
–
–
–
–
27
Block Move (WORD)
Block Clear
76
56
48
28
49
27
29
14
59
43
29
0
28
0
15
0
–
1.35
–
1.29
–
1.40
–
0.78
27
9
Shift Register (BIT)
201
153
153
79
85
36
34
18
0.69
0.68
0.71
0.37
15
Shift Register (WORD)
103
53
52
29
73
25
23
12
1.62
1.62
2.03
1.31
15
101
99
53
96
31
29
16
0.07
0.07
0.08
0.05
15
1272 1489
884
41
2
0
0
–
–
–
–
13
Bit Sequencer
165
COMM_REQ
Array Move
1317
INT
230
201
177
104
72
41
40
20
1.29
1.15
10.56
2.06
21
DINT
231
202
181
105
74
44
42
23
3.24
3.24
10.53
2.61
21
BIT
290
261
229
135
74
43
42
23
BYTE
WORD
228
230
198
201
176
177
104
104
74
72
42
41
42
40
23
20
0.81
1.29
–.03
–.03
0.82
1.15
-0.01
0.79
21
8.51
10.56
1.25
2.06
21
21
Search Equal
INT
197
158
123
82
78
39
37
20
1.93
1.97
2.55
1.55
19
DINT
206
166
135
87
79
38
36
21
4.33
4.34
4.55
2.44
19
BYTE
179
141
117
74
78
38
36
21
1.53
1.49
1.83
1.03
19
WORD
197
158
123
82
78
39
37
20
1.93
1.97
2.55
1.55
19
Notes: 1. Time (in microseconds) is based on Release 5.01 of Logicmaster 90-30/20 software for Models 311, 313, 340, and 341 CPUs (Release 7 for the 331).
2. For table functions, increment is in units of length specified.; for bit operation functions, microseconds/bit.; for data move functions, microseconds/number
of bits or words.
3. Enabled time for single length units of type %R, %AI, and %AQ.
4. COMMREQ time has been measured between CPU and HSC.
5. DOIO is the time to output values to discrete output module.
6. Where there is more than one possible case, the time indicated above represents the worst possible case.
7. For instructions that have an increment value, multiply the increment by (Length –1) and add that value to the base time.
GFK-0467M
Appendix A Instruction Timing
A-3
A
Table A-1. Instruction Timing, Standard Models-Continued
Function
Enabled
Group
Function
Search Not Equal
INT
DINT
311
313
331
Disabled
340/41
311
313
331
Increment
340/41
311
313
331
340/41
Size
198
159
124
83
79
39
36
21
1.93
1.93
2.48
1.52
19
201
163
132
84
79
37
35
21
6.49
6.47
6.88
3.82
19
BYTE
179
141
117
73
79
38
36
19
1.54
1.51
1.85
1.05
19
WORD
198
159
124
83
79
39
36
21
1.93
1.93
2.48
1.52
19
198
206
160
167
125
135
82
88
79
78
37
38
38
36
19
20
3.83
8.61
3.83
8.61
4.41
9.03
2.59
4.88
19
19
2.03
Search Greater Than
INT
DINT
BYTE
181
143
118
73
79
37
36
19
3.44
3.44
3.75
WORD
198
160
125
82
79
37
38
19
3.83
3.83
4.41
2.59
19
19
Search Greater Than/Eq
INT
197
160
124
83
77
38
36
20
3.86
3.83
4.45
2.52
19
DINT
BYTE
205
180
167
142
136
118
87
75
80
79
39
37
36
37
21
20
8.62
3.47
8.61
3.44
9.02
3.73
4.87
2.00
19
19
WORD
197
160
124
83
77
38
36
20
3.86
3.83
4.45
2.52
19
Search Less Than
INT
199
159
124
84
78
38
36
20
3.83
3.86
4.48
2.48
19
DINT
206
168
135
87
79
38
38
19
8.62
8.60
-1.36
4.88
19
BYTE
WORD
181
199
143
159
119
124
75
84
80
78
38
38
37
36
20
20
3.44
3.83
3.44
3.86
3.75
4.45
2.00
2.48
19
19
Search Less Than/Equal
Conversion
INT
200
158
124
82
79
38
37
21
3.79
3.90
4.45
2.55
19
DINT
207
167
137
88
78
39
37
19
8.60
8.61
9.01
4.86
19
BYTE
180
143
119
74
78
40
37
19
3.46
3.44
3.73
2.02
19
WORD
200
158
124
82
79
38
37
21
3.79
3.90
4.45
2.55
19
Convert to INT
74
46
39
25
42
1
1
1
–
–
–
–
9
Convert to BCD–4
77
50
34
25
42
1
1
1
–
–
–
–
9
Notes: 1. Time (in microseconds) is based on Release 5.01 of Logicmaster 90-30/20 software for Models 311, 313, 340, and 341 CPUs (Release 7 for the 331).
2. For table functions, increment is in units of length specified.; for bit operation functions, microseconds/bit.; for data move functions, microseconds/number
of bits or words.
3. Enabled time for single length units of type %R, %AI, and %AQ.
4. COMMREQ time has been measured between CPU and HSC.
5. DOIO is the time to output values to discrete output module.
6. Where there is more than one possible case, the time indicated above represents the worst possible case.
7. For instructions that have an increment value, multiply the increment by (Length –1) and add that value to the base time.
A-4
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
A
Table A-1. Instruction Timing, Standard Models-Continued
Function
Group
Control
Enabled
Disabled
Increment
Function
311
313
331
340/41
311
313
331
340/41
311
313
331
340/41
Size
Call a Subroutine
Do I/O
155
309
93
278
192
323
85
177
41
38
0
1
0
0
0
0
–
–
–
–
–
–
–
–
7
12
PID – ISA Algorithm
1870
1827
1812
929
91
56
82
30
–
–
–
–
15
PID – IND Algorithm
2047
2007
2002
1017
91
56
82
30
–
–
–
–
15
–
–
–
–
–
–
–
–
–
–
–
–
–
93
–
54
37
63
309
45
161
41
–
2
2
0
0
0
0
–
–
–
–
–
–
–
–
9
9
End Instruction
Service Request
#6
# 7 (Read)
# 7 (Set)
–
37
309
161
–
2
0
0
–
–
–
–
9
#14
447
418
483
244
41
2
0
0
–
–
–
–
9
#15
281
243
165
139
41
2
0
0
–
–
–
–
9
#16
#18
131
–
104
56
115
300
69
180
41
–
2
2
0
0
0
0
–
–
–
–
–
–
–
–
9
9
#23
1689
1663
1591
939
43
1
0
0
–
–
–
–
9
#26//30*
1268
1354
6680
3538
42
0
0
0
–
–
–
–
9
#29
Nested
MCR/ENDMCR
Combined
–
–
55
41
–
–
1
0
–
–
–
–
9
135
73
68
39
75
25
21
12
–
–
–
–
8
*Service request #26/30 was measured using a high speed counter, 16-point output, in a 5-slot rack.
Notes: 1. Time (in microseconds) is based on Release 5.01 of Logicmaster 90-30/20 software for Models 311, 313, 340, and 341 CPUs (Release 7 for the 331).
2. For table functions, increment is in units of length specified.; for bit operation functions, microseconds/bit.; for data move functions, microseconds/number
of bits or words.
3. Enabled time for single length units of type %R, %AI, and %AQ.
4. COMMREQ time has been measured between CPU and HSC.
5. DOIO is the time to output values to discrete output module.
6. Where there is more than one possible case, the time indicated above represents the worst possible case.
7. For instructions that have an increment value, multiply the increment by (Length –1) and add that value to the base time.
GFK-0467M
Appendix A Instruction Timing
A-5
A
Table A-2. Instruction Timing, 35x-36x Models
Function
Group
Function
Timers
Enabled
Disabled
Increment
350/351/36x
350/351/36x
350/351/36x
352
6
–
–
4
2
–
3
–
–
2
On-Delay Timer
Timer
4
3
Enabled Disabled Increment
352
352
Size
5
–
–
15
15
–
15
–
–
13
13
13
Off-Delay Timer
3
Counters
Up Counter
Down Counter
1
3
3
3
3
3
1
2
2
2
2
Math
Addition (INT)
2
0
–
1
0
–
Addition (DINT)
2
0
–
2
0
–
19
Addition (REAL)
52
0
–
33
0
–
17
Subtraction (INT)
Subtraction (DINT)
2
2
0
0
–
–
1
2
0
0
–
–
13
19
Subtraction (REAL)
53
0
–
34
0
–
17
Multiplication (INT)
21
0
–
21
0
–
13
Multiplication (DINT)
24
0
–
24
0
–
19
Trigonometric
Multiplication (REAL)
68
1
–
38
1
–
17
Division (INT)
Division (DINT),
22
25
0
0
–
–
22
25
0
0
–
–
13
19
Division (REAL)
82
2
–
36
2
–
17
Modulo Division (INT)
21
0
–
21
0
–
13
Modulo Div (DINT)
25
0
–
25
0
–
19
Square Root (INT)
Square Root (DINT)
42
70
1
0
–
–
41
70
1
0
–
–
10
13
Square Root (REAL)
137
0
–
35
0
–
11
SIN (REAL)
360
0
–
32
0
–
11
COS (REAL)
TAN (REAL)
319
510
0
1
–
–
29
32
0
1
–
–
11
11
ASIN (REAL)
440
0
–
45
0
–
11
ACOS (REAL)
683
0
–
63
0
–
11
11
ATAN (REAL)
264
1
–
33
1
–
Logarithmic
LOG (REAL)
469
0
–
32
0
–
11
Exponential
LN (REAL)
EXP
437
639
0
0
–
–
32
42
0
0
–
–
11
11
EXPT
89
1
–
54
1
–
17
Radian Conversion
Convert RAD to DEG
65
1
–
32
1
–
11
Convert DEG to RAD
59
0
32
0
11
Notes: 1. Time (in microseconds) is based on Release 7 of Logicmaster 90-30/20/Micro software for Model 351 and 352 CPUs.
2. For table functions, increment is in units of length specified.; for bit operation functions, microseconds/bit.; for data move
functions, microseconds/number of bits or words.
3. Enabled time for single length units of type %R, %AI, and %AQ.
4. COMMREQ time has been measured between CPU and HSC.
5. DOIO is the time to output values to discrete output module.
6. Where there is more than one possible case, the time indicated above represents the worst possible case.
A-6
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
A
Table A-2. Instruction Timing, 35x-36x Models-Continued
Function
Disabled
Increment
Enabled Disabled Increment
350/351/36x
350/351/36x
350/351/36x
352
352
352
Size
Equal (INT)
1
0
–
1
0
–
10
Equal (DINT)
2
0
–
2
0
–
16
Equal (REAL)
Not Equal (INT)
57
1
0
0
–
–
28
1
0
0
–
–
14
10
Not Equal (DINT)
1
0
–
1
0
–
16
Not Equal (REAL)
62
0
–
31
0
–
14
Greater Than (INT)
1
0
–
1
0
–
10
Greater Than (DINT)
Greater Than (REAL)
1
57
0
0
–
–
1
32
0
0
–
–
16
14
Greater Than/Equal (INT)
1
0
–
1
0
–
10
Greater Than/Equal (DINT)
1
0
–
1
0
–
10
Greater Than/Equal (REAL)
57
1
–
31
1
–
14
Less Than (INT)
1
0
–
1
0
–
10
Less Than (DINT)
Less Than (REAL)
1
58
0
1
–
–
1
36
0
1
–
–
16
14
Group
Relational
Enabled
Function
Less Than/Equal (INT)
1
0
–
1
0
–
10
Less Than/Equal (DINT)
3
0
–
3
0
–
16
Less Than/Equal (REAL)
Range (INT)
Range (DINT)
37
0
0
1
2
1
1
0
1
0
14
13
22
–
2
1
–
–
–
Range (WORD)
2
1
–
–
–
37
2
–
13
Bit
Logical AND
2
0
–
2
0
–
13
Operation
Logical OR
2
0
–
2
0
–
13
Logical Exclusive OR
1
0
–
1
0
–
13
Logical Invert, NOT
Shift Bit Left
1
31
0
1
–
1.37
1
31
0
1
–
1.37
10
16
Shift Bit Right
28
0
3.03
28
0
3.03
16
Rotate Bit Left
25
0
3.12
25
0
3.12
16
Rotate Bit Right
25
0
4.14
25
0
4.14
16
Bit Position
20
1
–
20
1
–
13
Bit Clear
Bit Test
20
20
0
0
–
–
20
20
0
0
–
–
13
13
Bit Set
Mask Compare (WORD)
19
1
1
0
–
–
19
52
52
0
–
–
13
25
Mask Compare (DWORD)
50
0
–
49
0
–
25
Notes: 1. Time (in microseconds) is based on Release 7 of Logicmaster 90-30/20/Micro software for Model 351 and 352 CPUs.
2. For table functions, increment is in units of length specified.; for bit operation functions, microseconds/bit.; for data
move functions, microseconds/number of bits or words.
3. Enabled time for single length units of type %R, %AI, and %AQ.
4. COMMREQ time has been measured between CPU and HSC.
5. DOIO is the time to output values to discrete output module.
6. Where there is more than one possible case, the time indicated above represents the worst possible case.
7. For instructions that have an increment value, multiply the increment by (Length –1) and add that value to the base time.
GFK-0467M
Appendix A Instruction Timing
A-7
A
Table A-2. Instruction Timing, 35x-36x Models-Continued
Function
Enabled
Disabled
Increment
Enabled
Disabled
Increment
350/351/36X
350/351/36X
350/351/36X
352
352
352
Size
2
28
0
0
0.41
4.98
2
28
0
0
0.41
4.98
10
13
Move (WORD)
2
0
0.41
2
0
0.41
10
Move (REAL)
24
1
0.82
24
1
0.82
13
Block Move (INT)
2
0
–
2
0
–
28
Block Move (WORD)
Block Move (REAL)
4
41
4
0
–
–
3
41
0
0
–
–
28
13
Block Clear
1
0
0.24
1
0
0.24
11
Shift Register (BIT)
49
0
0.23
46
0
0.23
16
Shift Register (WORD)
27
0
0.41
27
0
0.41
16
Bit Sequencer
38
22
0.02
38
22
0.02
16
COMM_REQ
765
0
–
765
0
–
13
Group
Function
Data Move
Table
Move (INT)
Move (BIT)
Array Move
INT
54
0
0.97
54
0
0.97
22
DINT
54
0
0.81
54
0
0.81
22
BIT
69
0
0.36
69
0
0.36
22
BYTE
54
1
0.64
54
1
0.64
22
WORD
54
0
0.97
54
0
0.97
22
Search Equal
INT
37
0
0.62
37
0
0.62
19
DINT
BYTE
41
35
1
0
1.38
0.46
41
35
1
0
1.38
0.46
22
19
WORD
37
0
0.62
37
0
0.62
19
Search Not Equal
INT
37
0
0.62
37
0
0.62
19
DINT
38
0
2.14
38
0
2.14
22
BYTE
37
0
0.47
37
0
0.47
19
WORD
37
0
0.62
37
0
0.62
19
Search Greater Than
INT
37
0
1.52
37
0
1.52
19
DINT
39
0
2.26
39
0
2.26
22
BYTE
36
1
1.24
36
1
1.24
19
WORD
37
0
1.52
37
0
1.52
19
Search Greater Than/Equal
INT
37
0
1.48
37
0
1.48
19
DINT
BYTE
39
37
0
1
2.33
1.34
39
37
0
1
2.33
1.34
22
19
WORD
37
0
1.48
37
0
1.48
19
Notes: 1. Time (in microseconds) is based on Release 7 of Logicmaster 90-30/20/Micro software for 350 and 360 Series CPUs.
2. For table functions, increment is in units of length specified.; for bit operation functions, microseconds/bit.; for data
move functions, microseconds/number of bits or words.
3. Enabled time for single length units of type %R, %AI, and %AQ.
4. COMMREQ time has been measured between CPU and HSC.
5. DOIO is the time to output values to discrete output module.
6. Where there is more than one possible case, the time indicated above represents the worst possible case.
7. For instructions that have an increment value, multiply the increment by (Length –1) and add that value to the base time.
A-8
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
A
Table A-2. Instruction Timing, 35x-36x Models-Continued
Function
Group
Function
Enabled
Disabled
Increment
Enabled
Disabled
Increment
350/351/36x
350/351/36x
350/351/36x
352
352
352
Size
37
41
0
1
1.52
2.27
37
41
0
1
1.52
2.27
19
22
Search Less Than
INT
DINT
BYTE
37
0
1.41
37
0
1.41
19
WORD
37
0
1.52
37
0
1.52
19
Search Less Than/Equal
Conversion
Control
INT
38
0
1.48
38
0
1.48
19
DINT
40
1
2.30
40
1
2.30
22
BYTE
WORD
37
38
0
0
1.24
1.48
37
38
0
0
1.24
1.48
19
19
Convert to INT
19
1
–
19
1
–
10
Convert to BCD-4
21
1
–
21
1
–
10
Convert to REAL
27
0
–
21
0
–
8
Convert to WORD
28
1
–
30
1
–
11
Truncate to INT
32
0
–
32
0
–
11
Truncate to DINT
63
0
–
31
0
–
11
Call a Subroutine
72
1
–
73
1
–
7
Do I/O
PID – ISA Algorithm*
114
162
1
34
–
–
115
162
1
34
–
–
13
16
PID – IND Algorithm*
146
34
–
146
34
–
16
–
–
–
–
–
–
–
End Instruction
Service Request
#6
22
1
–
22
1
–
10
#7 (Read)
75
1
–
75
1
–
10
#7 (Set)
#14
75
121
1
1
–
–
75
121
1
1
–
–
10
10
#15
46
1
–
46
1
–
10
#16
36
1
–
36
1
–
10
#18
261
1
–
261
1
–
10
#23
426
0
–
426
0
–
10
#26//30**
#29
2260
20
1
0
–
–
2260
20
1
0
–
–
10
10
1
1
–
1
1
–
4
See Table
A-3
26.50
#43
Nested MCR/ENDMCR
Combined
Sequential Event
Recorder (SER)
See Table A-3
*The PID times shown above are based on the 6.5 release of the 351 CPU.
**Service request #26/30 was measured using a high speed counter, 16-point output, in a 5-slot rack.
Notes: 1. Time (in microseconds) is based on Release 7 of Logicmaster 90-30/20/Micro software for 350 and 360 Series CPUs.
2. For table functions, increment is in units of length specified.; for bit operation functions, microseconds/bit.; for data move
functions, microseconds/number of bits or words.
3. Enabled time for single length units of type %R, %AI, and %AQ.
4. COMMREQ time has been measured between CPU and HSC.
5. DOIO is the time to output values to discrete output module.
6. Where there is more than one possible case, the time indicated above represents the worst possible case.
7. For instructions that have an increment value, multiply the increment by (Length –1) and add that value to the base time.
GFK-0467M
Appendix A Instruction Timing
A-9
A
Table A-3. SER Function Block Timing
Configuration
No power flow (disabled)
Contiguous
8 channels
16 channels
24 channels
32 channels
8 + 8 contiguous channels
8 + 8 + 8 contiguous
channels
8 + 8 + 8 + 8 contiguous
channels
Noncontiguous
8 channels
16 channels
24 channels
32 channels
Reset
with 8 channels
with 16 channels
with 24 channels
with 32 channels
Notes:
A-10
Example
—
%I1—8
%I1—16
%I1—24
%I1—32
%I1—8 and %Q1—8
%I1—8, %Q1—8 and
%M1—8
%I1—8, %Q1—8 and
%M1—8 and %T1—8
Time (µsec)
26.50
79.94
80.58
81.56
81.73
111.03
143.38
175.79
%I1, %M10, %Q3, etc.
299.64
552.83
806.35
1059.85
—
—
—
—
162.63
267.51
372.73
477.95
When a slot with an Input module is specified add an additional 46 µsecs to each of the Contiguous
and Noncontiguous timings.
When the trigger occurs, add an additional 29 usec if using BCD format or 148 usec if using Posix
format.
Times shown for reset are for the maximum buffer size of 1024 samples. (Reset clears
all samples in the sample buffer.)
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
A
Table A-4. Instruction Timing, 37x Models
Function
Enabled Disabled Increment
Group
Function
Timers
37x
On-Delay Timer
Timer
4
2
37x
37x
Size
5
–
–
15
15
–
15
–
–
13
13
2
2
2
2
Off-Delay Timer
3
Counters
Up Counter
Down Counter
2
1
Math
Addition (INT)
1
0
–
13
Addition (DINT)
2
0
–
19
Addition (REAL)
5
0
–
17
Subtraction (INT)
Subtraction (DINT)
1
2
0
0
–
–
13
19
Subtraction (REAL)
5
0
–
17
Multiplication (INT)
5
0
–
13
Multiplication (DINT)
5
0
–
19
Trigonometric
Multiplication (REAL)
5
0
–
17
Division (INT)
Division (DINT),
5
5
0
0
–
–
13
19
Division (REAL)
5
0
–
17
Modulo Division (INT)
5
0
–
13
Modulo Div (DINT)
5
0
–
19
Square Root (INT)
Square Root (DINT)
5
10
0
0
–
–
10
13
Square Root (REAL)
5
0
–
11
SIN (REAL)
10
0
–
11
COS (REAL)
TAN (REAL)
10
10
0
0
–
–
11
11
ASIN (REAL)
10
0
–
11
ACOS (REAL)
10
0
–
11
11
ATAN (REAL)
5
0
–
Logarithmic
LOG (REAL)
5
0
–
11
Exponential
LN (REAL)
EXP
5
10
0
0
–
–
11
11
EXPT
10
0
–
17
Radian Conversion
Convert RAD to DEG
5
0
–
Convert DEG to RAD
5
0
11
11
Notes: 1. For table functions, increment is in units of length specified.; for bit operation functions, microseconds/bit.; for data move
functions, microseconds/number of bits or words.
2. Enabled time for single length units of type %R, %AI, and %AQ.
3. COMMREQ time has been measured between CPU and HSC.
4. DOIO is the time to output values to discrete output module.
5. Where there is more than one possible case, the time indicated above represents the worst possible case.
GFK-0467M
Appendix A Instruction Timing
A-11
A
Table A-4. Instruction Timing, 37x Models- Continued
Function
Enabled Disabled Increment
Group
Relational
Function
Size
37x
37x
37x
Equal (INT)
1
0
–
10
Equal (DINT)
2
0
–
16
Equal (REAL)
Not Equal (INT)
5
1
0
0
–
–
14
10
Not Equal (DINT)
1
0
–
16
Not Equal (REAL)
5
0
–
14
Greater Than (INT)
1
0
–
10
Greater Than (DINT)
Greater Than (REAL)
1
5
0
0
–
–
16
14
Greater Than/Equal (INT)
1
0
–
10
Greater Than/Equal (DINT)
1
0
–
10
Greater Than/Equal (REAL)
5
0
–
14
Less Than (INT)
1
0
–
10
Less Than (DINT)
Less Than (REAL)
1
5
0
0
–
–
16
14
Less Than/Equal (INT)
1
0
–
10
Less Than/Equal (DINT)
3
0
–
16
Less Than/Equal (REAL)
Range (INT)
Range (DINT)
5
0
2
0
0
0
14
13
22
Range (WORD)
2
1
–
–
–
–
13
Bit
Logical AND
2
0
–
13
Operation
Logical OR
2
0
–
13
Logical Exclusive OR
1
0
–
13
Logical Invert, NOT
Shift Bit Left
1
5
0
0
–
1
10
16
Shift Bit Right
5
0
1
16
Rotate Bit Left
5
0
1
16
Rotate Bit Right
5
0
1
16
Bit Position
5
0
–
13
Bit Clear
Bit Test
5
5
0
0
–
–
13
13
Bit Set
Mask Compare (WORD)
5
0
9
0
–
–
13
25
Mask Compare (DWORD)
10
0
–
25
Notes: 1. For table functions, increment is in units of length specified.; for bit operation functions, microseconds/bit.; for data move
functions, microseconds/number of bits or words.
2. Enabled time for single length units of type %R, %AI, and %AQ.
3. COMMREQ time has been measured between CPU and HSC.
4. DOIO is the time to output values to discrete output module.
5. Where there is more than one possible case, the time indicated above represents the worst possible case.
A-12
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
A
Table A-4. Instruction Timing, 37x Models- Continued
Function
Group
Disabled
Increment
Function
Data Move
Table
Enabled
37x
37x
37x
Size
Move (INT)
Move (BIT)
2
5
0
0
1
1
10
13
Move (WORD)
2
0
1
10
Move (REAL)
5
0
1
13
Block Move (INT)
2
0
–
28
Block Move (WORD)
Block Move (REAL)
3
11
0
1
–
–
28
13
Block Clear
1
0
1
11
Shift Register (BIT)
10
0
1
16
Shift Register (WORD)
15
0
1
16
Bit Sequencer
COMM_REQ
14
200
10
200
1
–
16
13
Array Move
INT
10
0
1
22
DINT
15
0
1
22
BIT
10
0
1
22
BYTE
10
0
1
22
WORD
10
0
1
22
5
5
0
0
1
2
19
22
Search Equal
INT
DINT
BYTE
5
0
1
19
WORD
5
0
1
19
Search Not Equal
INT
5
0
1
19
DINT
10
0
2
22
BYTE
WORD
5
5
0
0
2
2
19
19
Search Greater Than
INT
5
0
1
19
DINT
5
0
2
22
BYTE
10
0
1
19
WORD
5
0
1
19
Search Greater Than/Equal
INT
5
0
1
19
DINT
BYTE
5
5
0
0
2
1
22
19
WORD
5
0
1
19
Notes: 1. For table functions, increment is in units of length specified.; for bit operation functions, microseconds/bit.; for data move
functions, microseconds/number of bits or words.
2. Enabled time for single length units of type %R, %AI, and %AQ.
3. COMMREQ time has been measured between CPU and HSC.
4. DOIO is the time to output values to discrete output module.
5. Where there is more than one possible case, the time indicated above represents the worst possible case.
6. For instructions that have an increment value, multiply the increment by (Length –1) and add that value to the base time.
GFK-0467M
Appendix A Instruction Timing
A-13
A
Table A-4. Instruction Timing, 37x Models- Continued
Function
Group
Function
Enabled
Disabled
Increment
37x
37x
37x
Size
5
10
0
0
1
2
19
22
Search Less Than
INT
DINT
BYTE
5
0
1
19
WORD
5
0
1
19
Search Less Than/Equal
Conversion
Control
INT
5
0
1
19
DINT
5
0
2
22
BYTE
WORD
5
5
0
0
1
1
19
19
Convert to INT
5
0
–
10
Convert to BCD-4
5
0
–
10
Convert to REAL
5
0
–
8
Convert to WORD
5
0
–
11
Truncate to INT
5
0
–
11
Truncate to DINT
5
0
–
11
Call a Subroutine
15
0
–
7
Do I/O
PID – ISA Algorithm
5
14
0
10
–
–
13
16
PID – IND Algorithm
14
10
–
16
End Instruction
–
–
–
–
Service Request
#6
5
0
–
10
#7 (Read)
10
0
–
10
#7 (Set)
#14
5
15
0
0
–
–
10
10
#15
5
0
–
10
#16
10
0
–
10
#18
255
0
–
10
#23
25
0
–
10
#26//30**
#29
155
5
0
0
–
–
10
10
Nested MCR/ENDMCR
Combined
1
0
–
4
Sequential Event
60
0
=
199
0
=
Recorder (SER) 8
Channels
Sequential Event
Recorder (SER) 16
Channels
**Service request #26/30 was measured using a high speed counter, 16-point output, in a 5-slot rack.
Notes: 1. For table functions, increment is in units of length specified.; for bit operation functions, microseconds/bit.; for data move
functions, microseconds/number of bits or words.
2 Enabled time for single length units of type %R, %AI, and %AQ.
3. COMMREQ time has been measured between CPU and HSC.
4. DOIO is the time to output values to discrete output module.
5. Where there is more than one possible case, the time indicated above represents the worst possible case.
6. For instructions that have an increment value, multiply the increment by (Length –1) and add that value to the base time.
A-14
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
A
CPU Boolean Execution Times
This table lists execution times of coils and contacts for the Series 90-30 CPU modules.
Table A-5. Boolean Execution Times
CPU Model
Execution Time per 1,000
Boolean Contacts/Coils
Models 37x
0.15 milliseconds
Models 35x and 36x
0.22 milliseconds
Models 340/341
0.3 milliseconds
Model 331
0.4 milliseconds
Models 313/323
0.6 milliseconds
Model 311
18.0 milliseconds
Instruction Sizes for CPUs 350 - 374
Memory Size in the following table refers to the number of bytes of user memory required by a
given instruction in a ladder diagram application program.
Table A-6. Instruction Sizes for CPUs 350 – 374
GFK-0467M
Function
Memory Size
Pop stack and AND to top
1
Pop stack and OR to top
1
Duplicate top of stack
1
Pop stack
1
Initial stack
1
Label
5
Jump
5
All other instructions
3
Function blocks – see Table A-2
various
Appendix A Instruction Timing
A-15
A
A-16
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
Appendix Interpreting Fault Tables
B
The Series 90-30, Series 90-20, and Series 90 Micro PLCs maintain two fault tables, the I/O fault
table for faults generated by I/O devices (including I/O controllers) and the PLC fault table for
internal PLC faults. The information in this appendix will enable you to interpret the message
structure format when reading these fault tables. Both tables contain similar information. The fault
data in these tables only exists in the PLC, not in the folder. Therefore, if using Logicmaster, you
must be connected in either the ONLINE or MONITOR mode to view faults.
•
•
The PLC fault table contains:
†
Fault location.
†
Fault description.
†
Date and time of fault.
The I/O fault table contains:
†
Fault location.
†
Reference address.
†
Fault category.
†
Fault type.
†
Date and time of fault.
PLC Fault Table
Access the PLC fault table through the programming software. For information about accessing
fault tables, refer to the online help, Logicmaster 90 Series 90-30/20/Micro Programming Software
User’s Manual, GFK-0466.
GFK-0467M
B-1
B
Example
The following figure shows the example of a System Configuration Mismatch fault that has been
zoomed to its fault detail screen.
The following diagram identifies each field in the fault entry for the System Configuration
Mismatch fault displayed above:
00 3A0000 000373F2 0B03 0600 000000000000000000000000000000000000000000000000
Spare
Error
Code
Task
Long/
Short
Slot
Rack
Fault
Group
Fault
Extra Data
Fault
Action
This System Configuration Mismatch fault entry is explained below. (All data is in hexadecimal.)
B-2
Field
Value
Comment
Long/Short
00
00=Short, which indicates only 8 bytes of the Fault Extra Data field
are used
Rack
00
Main rack (rack 0)
Slot
03
Slot 3
Task
F2
Fault Group
0B
System Configuration Mismatch fault
Fault Action
03
FATAL fault
Error Code
06
Fault Extra Data
00
No Fault Extra Data reported in the 8 bytes
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
B
The following paragraphs describe each field in the fault entry. Included are tables describing the
range of values each field may have.
Long/Short Indicator
This byte indicates whether 8 bytes or all 24 bytes of the Fault Extra Data field are used.
Type
Code
Fault Extra Data
Short
00
8 bytes
Long
01
24 bytes
Spare
These six bytes are pad bytes, used to make the PLC fault table entry exactly the same length as the
I/O fault table entry.
Rack
The rack number ranges from 0 to 7. Zero is the main rack, containing the PLC. Racks 1 through 7
are expansion racks, connected to the PLC through an expansion cable.
Slot
The slot number ranges from 0 to 9. The PLC CPU always occupies slot 1 in the main rack (rack
0).
Task
The task number ranges from 0 to +65,535. Sometimes the task number gives additional
information for PLC engineers; typically, the task can be ignored.
GFK-0467M
Appendix B Interpreting Fault Tables
B-3
B
PLC Fault Group
Fault group is the highest classification of a fault. It identifies the general category of the fault.
The fault description text displayed by Logicmaster 90-30/20/Micro software is based on the fault
group and the error codes.
Table B-1 lists the possible fault groups in the PLC fault table.
The last non-maskable fault group, Additional PLC Fault Codes, is declared for the handling of
new fault conditions in the system without the PLC having to specifically know the alarm codes.
All unrecognized PLC-type alarm codes belong to this group.
Table B-1. PLC Fault Groups
Group Number
B-4
Decimal
Hexadecimal
Group Name
1
4
5
8
11
12
13
14
16
17
18
19
20
21
22
–
1
4
5
8
B
C
D
E
10
11
12
13
14
15
16
–
Loss of, or missing, rack
Loss of, or missing, option module
Addition of, or extra, rack
Addition of, or extra, option module
System configuration mismatch
System bus error
PLC CPU hardware failure
Non-fatal module hardware failure
Option module software failure
Program block checksum failure
Low battery signal
Constant sweep time exceeded
PLC system fault table full
I/O fault table full
User Application fault
Additional PLC fault codes
Fatal
Diagnostic
Diagnostic
Diagnostic
Fatal
Diagnostic
Fatal
Diagnostic
Diagnostic
Fatal
Diagnostic
Diagnostic
Diagnostic
Diagnostic
Diagnostic
As specified
128
129
130
80
81
82
System bus failure
No user’s program on power-up
Corrupted user RAM detected
Fatal
Informational
Fatal
132
135
137
84
87
89
Password access failure
PLC CPU software failure
PLC sequence-store failure
Informational
Fatal
Fatal
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
Fault Action
GFK-0467M
B
Fault Action
Each fault may have one of three actions associated with it. These fault actions are fixed on the
Series 90-30 PLC and cannot be changed by the user.
Table B-2. PLC Fault Actions
Fault Action
Action Taken by CPU
Informational
Diagnostic
Code
Log fault in fault table
Log fault in fault table
Set fault references
Log fault in fault table
Set fault references
Go to STOP mode
Fatal
1
2
3
Error Code
The error code further describes the fault. Each fault group has its own set of error codes. Table B3 shows error codes for the PLC Software Error Group (Group 87H).
Table B-3. Alarm Error Codes for PLC CPU Software Faults
Decimal
Hexadecimal
20
14
Corrupted PLC Program Memory
39
27
Corrupted PLC Program Memory
82
52
Backplane Communications Failed
90
5A
User Shut Down Requested
All others
Name
PLC CPU Internal System Error
Table B-4 shows the error codes for all the other fault groups.
GFK-0467M
Appendix B Interpreting Fault Tables
B-5
B
Table B-4. Alarm Error Codes for PLC Faults
Decimal
Hexadecimal
Name
PLC Error Codes for Loss of Option Module Group (4)
44
45
255
79
2C
2D
FF
4F
Option Module Soft Reset Failed
Option Module Soft Reset Failed
Option Module Communication Failed
Loss of Daughterboard
Error Codes for Reset of, Addition of, or Extra Option Module Group (8)
2
04
05
1
2
3
5
11
13
401
8
10
23
58
2
Module Restart Complete
4
Addition of Daughterboard
5
Reset of Daughterboard
All others
Reset of, Addition of, or Extra Option Module
Error Codes for Option Module Software Failure Group (10 hex)
1
2
Unsupported Board Type
COMREQ – mailbox full on outgoing message that starts the
COMREQ
3
COMREQ – mailbox full on response
5
Backplane Communications with PLC; Lost Request
B
Resource (alloc, tbl ovrflw, etc.) error
D
User program error
191
Module Software Corrupted; Requesting Reload
Error Codes for System Configuration Mismatch Group (B hex)
8
Analog Expansion Mismatch
A
Unsupported Feature
17
Program exceeds memory limits
3A
Mismatch of Daughterboard
Error Codes for System Bus Error Group (C hex)
All others
System Bus Error
3
Error Codes for Program Block Checksum Group (11 hex)
3
Program or program block checksum failure
0
1
0
1
2
5
6
7
Error Codes for User Application Fault Group (16 hex)
2
PLC Watchdog Timer Timed Out
5
COMREQ – WAIT mode not available for this command
6
COMREQ – Bad Task ID
7
Application Stack Overflow
1
1
1
2
3
4
Error Codes for Low Battery Signal
Failed battery on PLC CPU or other module
Low battery on PLC CPU or other module
Error Codes for System Bus Failure Group (80 hex)
Operating system
Error Codes for Corrupted User RAM on Powerup Group (82 hex)
1
Corrupted User RAM on Power-up
2
Illegal Boolean Opcode Detected
3
PLC_ISCP_PC_OVERFLOW
4
PRG_SYNTAX_ERR
Error Codes for PLC CPU Hardware Faults (D hex)
All codes
B-6
PLC CPU Hardware Failure
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
B
Fault Extra Data
This field contains details of the fault entry. The following example shows what data may be
present:
Example - Corrupted User RAM Group
Four of the error codes in the System Configuration Mismatch group supply fault extra data:
Table B-5. PLC Fault Data – Illegal Boolean Opcode Detected
Fault Extra Data
Model Number Mismatch
[0]
ISCP Fault Register Contents
[1]
Bad OPCODE
[2,3]
ISCP Program Counter
[4,5]
Function Number
For a RAM failure in the PLC CPU (one of the faults reported as a PLC CPU
hardware failure), the address of the failure is stored in the first four bytes of the
field.
PLC Fault Time Stamp
PLC CPU Hardware Failure (RAM Failure)
The six-byte time stamp is the value of the system clock when the fault was recorded by the PLC
CPU. (Values are coded in BCD format.)
Table B-6. PLC Fault Time Stamp
Byte Number
1
2
3
4
5
6
GFK-0467M
Appendix B Interpreting Fault Tables
Description
Seconds
Minutes
Hours
Day of the month
Month
Year
B-7
B
I/O Fault Table
The following figure shows the example of a Loss of I/O Module fault that has been zoomed to its
fault detail screen.
The following diagram identifies the hexadecimal information displayed in each field in the
example fault entry (System Configuration Mismatch) shown in the figure above.
Reference Address
Block
Fault
Fault Fault
Action Type Specific Data
Slot
02 461100 00047F7FFF7F 0302 0E 00 00 0700000000000000000000000000000000000000000000
Rack
B-8
Fault
Group
I/O
Bus
Long/
Short
Point
Fault
Description
Fault
Category
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
B
The following paragraphs describe each field in the I/O fault table. Included are tables describing
the range of values each field may have.
Long/Short Indicator
This byte indicates whether the particular fault uses 5 bytes or ass 21 bytes of the Fault Specific
Data field.
Table B-7. I/O Fault Table Format Indicator Byte
Type
Code
Fault Specific Data
Short
02
5 bytes
Long
03
21 bytes
Reference Address
Reference address is a three-byte address containing the I/O memory type and location (or offset) in
that memory which corresponds to the point experiencing the fault. Or, when a Genius block fault
or integral analog module fault occurs, the reference address refers to the first point on the block
where the fault occurred.
Table B-8. I/O Reference Address
Byte
Description
Range
0
Memory Type
0 – FF
1–2
Offset
0 – 7FF
The memory type byte is one of the following values.
Table B-9. I/O Reference Address Memory Type
Name
Value (Hexadecimal)
Analog input
0A
Analog output
0C
Analog grouped
0D
Discrete input
10 or 46
Discrete output
12 or 48
Discrete grouped
1F
I/O Fault Address
The I/O fault address is a six-byte address containing rack, slot, bus, block, and point address of the
I/O point that generated the fault. The point address is a word; all other addresses are one byte
each. All five values may not be present in a fault.
When an I/O fault address does not contain all five addresses, a 7F hex appears in the address to
indicate where the significance stops. For example, if 7F appears in the bus byte, the fault is a
module fault. Only rack and slot values are significant.
GFK-0467M
Appendix B Interpreting Fault Tables
B-9
B
Rack
The rack number ranges from 0 to 7. Zero is the main rack, i.e., the one containing the CPU.
Racks 1 through 7 are expansion racks.
Slot
The slot number ranges from 0 to 9. The PLC CPU always occupies slot 1 in the main rack
(rack 0).
Point
Point ranges from 1 to 1024 (decimal). It tells which point on the block has the fault when the fault
is a point-type fault.
I/O Fault Group
Fault group is the highest classification of a fault. It identifies the general category of the fault.
The fault description text displayed by Logicmaster 90-30/20/Micro software is based on the fault
group and the error codes.
Table B-10 lists the possible fault groups in the I/O fault table. Group numbers less than 80 (Hex)
are maskable faults.
The last non-maskable fault group, Additional I/O Fault Codes, is declared for the handling of new
fault conditions in the system without the PLC having to specifically know the alarm codes. All
unrecognized I/O-type alarm codes belong to this group.
Table B-10. I/O Fault Groups
Group Number
B-10
Group Name
Fault Action
3
Loss of, or missing, I/O module
Diagnostic
7
Addition of, or extra, I/O module
Diagnostic
9
IOC or I/O bus fault
Diagnostic
A
I/O module fault
Diagnostic
–
Additional I/O fault codes
As specified
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
B
I/O Fault Action
The fault action specifies what action the PLC CPU should take when a fault occurs. Table B-11
lists possible fault actions.
Table B-11. I/O Fault Actions
Fault Action
Action Taken by CPU
Code
Informational
Log fault in fault table
1
Diagnostic
Log fault in fault table
Set fault references
2
Fatal
Log fault in fault table
Set fault references
Go to STOP mode
3
I/O Fault Specific Data
An I/O fault table entry may contain up to 5 bytes of I/O fault specific data.
Symbolic Fault Specific Data
Table B-12 lists data that is required for block circuit configuration.
Table B-12. I/O Fault Specific Data
Decimal Number
Hex Code
Description
Circuit Configuration
1
2
3
Circuit is an input – tristate
Circuit is an input
Circuit is an output
Fault Actions for Specific Faults
Forced/unforced circuit faults are reported as informational faults. All others are diagnostic or
fatal.
The model number mismatch, I/O type mismatch and non-existent I/O module faults are reported in
the PLC fault table under the System Configuration Mismatch group. They are not reported in the
I/O fault table.
GFK-0467M
Appendix B Interpreting Fault Tables
B-11
B
I/O Fault Time Stamp
The six-byte time stamp is the value of the system clock when the fault was recorded by the PLC
CPU. Values are coded in BCD format.
Table B-13. I/O Fault Time Stamp
B-12
Byte Number
Description
1
2
3
4
5
6
Seconds
Minutes
Hours
Day of the month
Month
Year
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
Appendix Instruction Mnemonics
C
In Program Display/Edit mode, you can quickly enter or search for a programming instruction by
typing the ampersand (&) character followed by the instruction’s mnemonic. For some instructions,
you can also specify a reference address or nickname, a label, or a location reference address.
This appendix lists the mnemonics of the programming instructions for Logicmaster
90-30/20/Micro programming software. The complete mnemonic is shown in column 3 of this
table, and the shortest entry you can make for each instruction is listed in column 4.
At any time during programming in Logicmaster, you can display a help screen that lists these
mnemonics by pressing the ALT and I keys.
Function
Group
Mnemonic
Instruction
All
Contacts
Coils
Links
Timers
Counters
GFK-0467M
INT
Any Contact
&CON
&CON
Normally Open Contact
&NOCON
&NOCON
Normally Closed Contact
&NCCON
&NCCON
Continuation Contact
&CONC
&CONC
Any Coil
&COI
&COI
Normally Open Coil
&NOCOI
&NOCOI
Negated Coil
&NCCOI
&NCCOI
Positive Transition Coil
&PCOI
&PCOI
Negative Transition Coil
&NCOI
&NCOI
SET Coil
&SL
&SL
RESET Coil
&RL
&RL
Retentive SET Coil
&SM
&SM
Retentive RESET Coil
&RM
&RM
Retentive Coil
&NOM
&NOM
Negated Retentive Coil
&NCM
&NCM
Continuation Coil
&COILC
&COILC
Horizontal Link
&HO
&HO
Vertical Link
&VE
&VE
On Delay Timer
&ON
&ON
Elapsed Timer
Off Delay Timer
&TM
&OF
&TM
&OF
Up Counter
&UP
&UP
Down Counter
&DN
&DN
DINT
BIT
BYTE
WORD
REAL
C-1
C
Function
Group
Mnemonic
Instruction
All
Math
Relational
Bit
Operation
Conversion
C-2
BCD-4
INT
DINT
BIT
BYTE
WORD
&AD_R
&SUB_R
&MUL_R
&DIV_R
&MOD_R&SQ_R
Addition
&AD
&AD_I
&AD_DI
Subtraction
&SUB
&SUB_I
&SUB_DI
Multiplication
&MUL
&MUL_I
&MUL_DI
Division
&DIV
&DIV_I
&DIV_DI
Modulo
&MOD
&MOD_I
&MOD_DI
Square Root
&SQ
&SQ_I
&SQ_DI
Sine
&SIN
Cosine
&COS
Tangent
&TAN
Inverse Sine
&ASIN
Inverse Cosine
&ACOS
Inverse Tangent
&ATAN
Base 10 Logarithm
&LOG
Natural Logarithm
&LN
Power of e
&EXP
Power of x
&EXPT
Equal
&EQ
&EQ_I
&EQ_DI
Not Equal
&NE
&NE_I
&NE_DI
Greater Than
&GT
&GT_I
&GT_DI
Greater or Equal
&GE
&GE_I
&GE_DI
Less Than
&LT
&LT_I
&LT_DI
Less Than or Equal
&LE
&LE_I
&LE_DI
AND
&AN
&AN_W
OR
&OR
&OR_W
Exclusive OR
&XO
&XO_W
NOT
&NOT
&NOT_W
Bit Shift Left
&SHL
&SHL_W
Bit Shift Right
&SHR
&SHR_W
Bit Rotate Left
&ROL
&ROL_W
Bit Rotate Right
&ROR
&ROR_W
Bit Test
&BT
&BT_W
Bit Set
&BS
&BS_W
Bit Clear
&BCL
&BCL_W
Bit Position
Masked Compare
&BP
&MCMP
&BP_W
&MCM_W
Convert to Integer
&TO_INT
Convert to Double Integer
&TO_DINT
Convert to BCD–4
&BCD4
Convert to REAL
&TO_REAL
Convert to WORD
&TO_W
Truncate to Integer
&TRINT
Truncate to Double Integer
&TRDINT
REAL
&EQ_R
&NE_R
&GT_R
&GE_R
&LT_R
&LE_R
&TO_INT_BCD4
&BCD4_R
&TO_REAL_DI
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
&TO_REAL_W
GFK-0467M
C
Mnemonic
Function
Group
Instruction
All
Data Move
Table
Control
GFK-0467M
INT
DINT
BIT
BYTE
&MOV_BI
WORD
Move
&MOV
&MOV_I
Block Move
&BLKM
&BLKM_I
Block Clear
&BLKC
Shift Register
&SHF
Bit Sequencer
Communications Request
&BI
Array Move
&AR
&AR_I
&AR_DI
&AR_BY
&AR_W
Search Equal
&SRCHE
&SRCHE_I
&SRCHE_DI
&SRCHE_BY
&SRCHE_W
Search Not Equal
&SRCHN
&SRCHN_I
&SRCHN_DI
&SRCHN_BY
Search Greater Than
&SRCHGT
&SRCHGT_I
&SRCHGT_DI
&SRCHGT_BY
Search Greater Than or Equal
&SRCHGE
&SRCHGE_I
&SRCHGE_DI
&SRCHGE_BY
Search Less Than
&SRCHLT
&SRCHLT_I
&SRCHLT_DI
&SRCHLT_BY
&SRCHN_W
&SRCHGT_W
&SRCHGE_W
&SRCHLT_W
&SRCHLE_W_
Search Less Than or Equal
&SRCHLE
&SRCHLE_I
&SRCHLE_DI
&SRCHLE_BY
&SHF_BI
REAL
&MOV_W
&MOV_R
&BLKM_W
&BLKM_R
&AR_W
&COMMR
Call a Subroutine
&CA
Do I/O
&DO
SER
&SER
PID – ISA Algorithm
&PIDIS
PID – IND Algorithm
&PIDIN
SFC Reset
&SFCR
End
&END
Rung Explanation (Comment)
&COMME
System Services Request
&SV
Master Control Relay
&MCR
End Master Control Relay
&ENDMCR
Nested Master Control Relay
&MCRN
Nested End Master Cntl Relay
&ENDMCRN
Jump
&JUMP
Nested Jump
&JUMPN
Label
&LABEL
Nested Label
&LABELN
Appendix C Instruction Mnemonics
&AR_BI
C-3
Appendix Key Functions
D
This appendix lists the keyboard functions that are active in the software environment. To display
this information on the Logicmaster screen, press ALT-K to access key help.
Key Sequence
Description
Key Sequence
Description
Keys Available Throughout the Software Package
ALT-A
ALT-C
ALT-M
ALT-R
ALT-E
Abort.
Clear field.
Change Programmer mode.
Change PLC Run/Stop state.
Toggle status area.
CTRL-Break
Esc
CTRL-Home
CTRL-End
ALT-J
Toggle command line.
ALT-L
ALT-P
ALT-H
ALT-K
ALT-I
ALT-N
ALT-T
ALT-Q
ALT-n
List directory files.
Print screen.
Help.
Key help.
Instruction mnemonic help.
Toggle display options.
Start Teach mode.
Stop Teach mode.
Playback file n (n = 0 thru 9).
CTRL-→
CTRL-D
CTRL-U
Tab
Shift-Tab
Enter
CTRL-E
F12 or Keypad F11 or Keypad *
ALT-B
ALT-D
ALT-S
ALT-X
ALT-U
ALT-V
ALT-F2
Toggle text editor bell.
Delete rung element/Delete rung.
Store block to PLC and disk.
Display zoom level.
Update disk.
Variable table window.
Go to operand reference table.
ALT-O
Password override. Available only on the Password screen in the configuration software.
CTRL- ←
Exit package.
Zoom out.
Previous command-line contents.
Next command-line contents.
Cursor left within the field.
Cursor right within the field.
Decrement reference address.
Increment reference address.
Change/increment field contents.
Change/decrement field contents.
Accept field contents.
Display last system error.
Toggle discrete reference.
Override discrete reference.
Keys Available in the Program Editor Only
Keypad +
Enter
CTRL-PgUp
CTRL-PgDn
~
|
Tab
Accept rung.
Accept rung.
Previous rung.
Next rung.
Horizontal shunt.
Vertical shunt.
Go to the next operand field.
Special Keys
GFK-0467M
D-1
D
The Help card on the next page contains a listing of the key help and also the instruction
mnemonics help text for Logicmaster 90-30/20/Micro software. This card is printed in triplicate
and is perforated for easier removal from the manual.
D-2
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
D
Print side 1 of GFJ-055D on this page.
GFK-0467M
Appendix D Key Functions
D-3
D
Print side 2 of GFJ-055D on this page.
D-4
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
Appendix Using Floating-Point Numbers
E
There are a few considerations you need to understand when using floating-point numbers. The first
section discusses these general considerations. Refer to page E-5 and following for instructions on
entering and displaying floating-point numbers.
Note
Floating-point capabilities are only supported on the 35x and 36x series CPUs
Release 9.00 or later, and on all releases of CPU352 and 37x series.
Floating-Point Numbers
The programming software provides the ability to edit, display, store, and retrieve numbers with
real values. Some functions operate on floating-point numbers. However, to use floating-point
numbers with the programming software, you must have a 35x, 36x or 37x series CPU (see Note
above). Floating-point numbers are represented in decimal scientific notation, with a display of six
significant digits.
Note
In this manual, the terms “floating-point” and “real” are used interchangeably to
describe the floating-point number display/entry feature of the programming
software.
The following format is used. For numbers in the range 9999999 to .0001, the display has no
exponent and up to six or seven significant digits. For example:
Entered
Displayed
.000123456789
+.0001234567
Description
Ten digits, six or seven significant.
–12.345e-2
–.1234500
Seven digits, six or seven significant.
1234
+1234.000
Seven digits, six or seven significant.
Outside the range listed above, only six significant digits are displayed and the display has the
following form: +1.23456E+12
GFK-0467M
E-1
E
Real Number Terminology
A real number is stored in a 32-bit double word register. The following discusses the terms used
for the parts of a real number.
Mantissa
Exponent Indicator
-1.23456E+12
Sign
Radix
Exponent
Value
Exponent
Sign
Sign – Either plus or minus. Stored in the most significant bit (bit 32) of the double
word. A one in bit 32 indicates a negative sign. A zero in bit 32 indicates a positive
sign.
Radix – A period (dot) symbol that separates the whole number portion from the
fractional number portion of the mantissa. For decimal numbers, the radix is
commonly called the decimal point.
Exponent – (Also called a “Characteristic”). It is stored in 8 bits, in bit positions 31
through 24 of the 32-bit double word. The exponent may have values in the range
of +127 to –126; however, the exponent is always stored as a positive number
because the CPU automatically adds 127 to its value before storing it.
Mantissa – (Also called a Significand”). The basic number without the sign and
exponent. It is stored in 23 bits, in bit positions 23 through 1 of the 32-bit word.
Precision – Related to the number of significant digits that can be stored. Since a
double integer register uses 31 bits to store a number (bit 32 is used for the sign), it
can potentially store numbers with greater precision than a real (floating-point)
register, which only uses 23 bits to store a number’s mantissa.
E-2
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
E
Internal Format of Floating-Point Numbers
Floating-point numbers are stored in single precision IEEE-standard format. This format requires
32 bits, which translates to two adjacent 16-bit PLC registers. The encoding of the bits is
diagrammed below.
Bits 17-32
32 31
Bits 1-16
24 23
1
17 16
23-bit mantissa
8-bit exponent
1-bit sign (Bit 32)
Register use by a single floating-point number is diagrammed below. In this diagram, if the
floating-point number occupies registers %R0005 and %R0006, for example, %R0005 is the least
significant register and %R0006 is the most significant register.
Least Significant Register
Bits 1-16
16
1
Least Significant Bit: Bit 1
Most Significant Bit: Bit 16
Most Significant Register
Bits 17-32
32
17
Least Significant Bit: Bit 17
Most Significant Bit: Bit 32
GFK-0467M
Appendix E Using Floating-Point Numbers
E-3
E
Values of Floating-Point Numbers
Use the following table to calculate the value of a floating-point number from the binary number
stored in two registers.
Exponent (e)
Mantissa (f)
Value of Floating Point Number
255
Non-zero
255
0
0 < e < 255
Any value
–1s * 2e–127 * 1.f
0
Non-zero
–1s * 2–126 * 0.f
0
0
Not a valid number (NaN).
–1s * ∞
0
f = the mantissa. The mantissa is a binary fraction.
e = the exponent. The exponent is an integer E such that E+127 is the power of 2 by which the mantissa
must be multiplied to yield the floating-point value.
s = the sign bit.
* = the multiplication operator.
For example, consider the floating-point number 12.5. The IEEE floating-point binary
representation of the number is:
01000001 01001000 00000000 00000000
or 41480000 hex. The most significant bit (the sign bit) is zero (s=0). The next eight most
significant bits are 10000010, or 130 decimal (e=130).
The mantissa is stored as a decimal binary number with the decimal point preceding the most
significant of the 23 bits. Thus, the most significant bit in the mantissa is a multiple of 2–1, the next
most significant bit is a multiple of 2–2, and so on to the least significant bit, which is a multiple of
2–23. The final 23 bits (the mantissa) are:
1001000 00000000 00000000
The value of the mantissa, then, is .5625 (that is, 2–1 + 2–4).
Since e > 0 and e < 255, we use the third formula in the table above:
number = –1s * 2e–127 * 1.f
= –10 * 2130–127 * 1.5625
= 1 * 23 * 1.5625
= 8 * 1.5625
= 12.5
Thus, you can see that the above binary representation is correct.
The range of numbers that can be stored in this format is from ± 1.401298E–45 to
± 3.402823E+38 and the number zero.
E-4
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
E
Entering and Displaying Floating-Point Numbers
In the mantissa, up to six or seven significant digits of precision may be entered and stored;
however, the programming software will display only the first six of these digits. The mantissa may
be preceded by a positive or negative sign. If no sign is entered, the floating-point number is
assumed to be positive.
If an exponent is entered, it must be preceded by the letter E or e, and the mantissa must contain
a decimal point to avoid mistaking it for a hexadecimal number. The exponent may be preceded by
a sign; but, if none is provided, it is assumed to be positive. If no exponent is entered, it is assumed
to be zero. No spaces are allowed in a floating-point number.
To provide ease-of-use, several formats are accepted in both command-line and field data entry.
These formats include an integer, a decimal number, or a decimal number followed by an exponent.
These numbers are converted to a standard form for display once the user has entered the data and
pressed the Enter key.
Examples of valid floating-point number entries and their normalized display are shown below.
Entered
Displayed in
Logicmaster
250
+250.0000
+4
+4.000000
–2383019
–2383019.
34.
+34.00000
–.0036209
–.003620900
12.E+9
+1.20000E+10
–.0004E–11
–4.00000E–15
731.0388
+731.0388
99.20003e–29
+9.92000E–28
Examples of invalid or incorrect floating-point number entries are shown below.
Incorrect Entry
GFK-0467M
Explanation/Result
–433E23
Missing decimal point. LM90 displays message “Bad numeric value.”
10e-19
Missing decimal point. LM90 displays message “Bad numeric value.”
1 0.e19
There is a space between the 1 and the 0 in the mantissa. Real numbers
must be entered without spaces between digits or characters. Logicmaster
recognizes this entry as the incorrect value +1.000000.
4.1e 19
There is a space between the e and the 19 in the exponent. Real numbers
must be entered without spaces between digits or characters. Logicmaster
recognizes this entry as the incorrect value +4.100000.
Appendix E Using Floating-Point Numbers
E-5
E
Errors in Floating-Point Numbers and Operations
Positive and Negative Infinity
On a 352 or 374 CPU, overflow occurs when a number greater than 3.402823E+38 or less than
-3.402823E+38 is generated by a REAL function. On all other 90-30 models that support floating
point operations, the range is greater than 216 or less than –216. When your number exceeds the
range, the ok output of the function is set OFF, and the result is set to positive infinity (for a number
greater than 3.402823E+38 on a 352 or 374 CPU or 216 on all other models) or negative infinity
(for a number less than –3.402823E+38 or –216 on all other models). You can determine where this
occurs by testing the sense of the ok output.
Mnemonic
Ladder Screen
Value
Reference Table
Value (Hex)
Description
POS_INF
+OVERFLOW
7F80 0000
IEEE positive infinity representation in hex.
NEG_INF
-OVERFLOW
FF80 0000
IEEE negative infinity representation in hex.
Note
If you are using software floating point (all models capable of floating point
operations except the 352 or 374 CPU), numbers are rounded to zero (0) at
±1.175494E–38.
If the infinities produced by overflow are used as operands to other REAL functions, they may
cause an undefined result. This undefined result is referred to as an NaN (Not a Number). For
example, the result of adding positive infinity to negative infinity is undefined. When the
ADD_REAL function is invoked with positive infinity and negative infinity as its operands, it
produces an NaN for its result.
Not a Number (NaN)
A Not a Number is an undefined number such as the result of dividing zero by zero. Positive and
Negative Infinities are not considered to be NaNs. The following sections will help you identify
when an NaN result has been obtained.
E-6
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
E
NaN Codes for 352 or 374 CPU
On a 352 or 374 CPU, each REAL function capable of producing an NaN produces a specialized
NaN code that identifies the function and can be read in the applicable Reference Table. The
indication on the Logicmaster ladder logic screen will be the unsigned term “OVERFLOW.” (If the
term “OVERFLOW” is preceded by a plus or minus sign, it indicates a positive or negative
infinity.)
Not a Number (NaN) Codes for the 352 and 374 CPU
Mnemonic
Reference Table
Value (Hex)
Description
NaN_ADD.
7F81 FFFF
Real addition error value in hex.
NaN_SUB
7F81 FFFF
Real subtraction error value in hex.
NaN_MUL
7F82 FFFF
Real multiplication error value in hex.
NaN_DIV
7F83 FFFF
Real division error value in hex.
NaN_SQRT
7F84 FFFF
Real square root error value in hex.
NaN_LOG
7F85 FFFF
Real logarithm error value in hex.
NaN_POW0
7F86 FFFF
Real exponent error value in hex.
NaN_SIN
7F87 FFFF
Real sine error value in hex.
NaN_COS
7F88 FFFF
Real cosine error value in hex.
NaN_TAN
7F89 FFFF
Real tangent error value in hex.
NaN_ASIN
7F8A FFFF
Real inverse sine error value in hex.
NaN_ACOS
7F8B FFFF
Real inverse cosine error value in hex.
NaN_BCD
7F8C FFFF
BCD-4 to real error.
REAL_INDEF
FFC0 0000
Real indefinite, divide 0 by 0 error.
NaN Code for 35x, 36x, and 37x CPUs (excluding 352 CPU)
All Series 90-30 CPUs that support firmware-based floating point operations (which excludes the
352 CPU, which is hardware-based) produce only one NaN output: FFFF FFFF. The indication on
the Logicmaster ladder logic screen will be the unsigned term “OVERFLOW.”
Not a Number (NaN) Type for 35x, 36x, and 37xCPUs (Excluding 352 CPU)
GFK-0467M
Mnemonic
Reference Table
Value (Hex)
Description
NaN_SW
FFFF FFFF
Software Floating Point code for all NaNs
Appendix E Using Floating-Point Numbers
E-7
E
Propagation and Power Flow for NaN and Infinity Numbers
When an NaN result is fed into another function, it passes through to the result. For example, if an
NaN_ADD is the first operand to the SUB_REAL function, the result of the SUB_REAL is
NaN_ADD. If both operands to a function are NaNs, the first operand will pass through. Because
of this feature of propagating NaNs through functions, you can identify the function where the NaN
originated.
Note
For NaN, the ok output is OFF (not energized).
The following table explains when power is or is not passed when dealing with numbers viewed as
or equal to infinity for binary operations such as Add, Multiply, etc. As shown previously, outputs
that exceed the positive or negative limits are viewed as POS_INF or NEG_INF respectively.
Table E-1. General Case of Power Flow for Floating-Point Math Operations
Operation
E-8
Input 1
Input 2
Output
Power Flow
All
Number
Number
Positive or
Negative Infinity
No
All Except
Division
Infinity
Number
Infinity
Yes
All
Number
Infinity
Infinity
Yes
Division
Infinity
Number
Infinity
No
All
Number
Number
NaN
No
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
Appendix Programming Software Comparison
F
This manual was written for users of Logicmaster (a DOS-based PLC programming software). The
Windows-based PLC software products, such as CIMPLICITY® Machine Edition Logic
Developer and VersaPro®, provide PLC instruction set information in the software’s built-in online help system rather than in a manual. Users of the Windows-based programming software
should be aware that instructions appear differently than the way they appear on a Logicmaster
screen (they still work the same in the PLC). The online help system has the most accurate
information about using the instruction set in the Windows-based programming software.
In addition to the on-line help system, you can refer to the following manuals for information on
using the software:
VersaPro™ Programming Software User’s Guide, GFK-1670
CIMPLICITY® Machine Edition Getting Started Guide, GFK-1868
Notes
Support for DRUM Sequencer Instruction
This instruction, supported by CPUs 350-364 release 10.00 and later, and all versions of CPU37x ,
is not supported in any version of Logicmaster; therefore, not discussed in this manual. This
instruction is supported in VersaPro, starting with release 1.1, and in all versions of Logic
Developer. Information for this instruction can be found in the on-line help built into these two
software packages.
Start and End of Program Markers
These are used in Logicmaster ladder logic screens, but are not visible on the Windows-based
programmers’ ladder logic screens.
Instruction Control Word Address Location
Certain instructions, such as timers, counters, and the bit sequencer require a group of consecutive
words to store certain internal calculations. This group of words is usually called a control block.
In Logicmaster, the address of the first word of the control block (as well as any value stored in that
address) appears below the instruction on the ladder logic screen (as %R00100 in the figure below).
For the Windows-based programmers, this reference address of the first word appears inside the
instruction on the ladder logic screen (as %R00030 in the figure below). VersaPro also displays
GFK-0467M
F-1
F
the Variable Name of the reference address (Delay in the in figure below) inside the instruction. If
no one has assigned a Variable Name to the reference address, the address itself will be the default
Variable Name (so the reference address would appear inside the instruction in both places). Right
above the word Delay in the VersaPro view is the value 113, which represents the current value
stored in that variable.
Enable
ONDTR
0.10s
Reset
R
Preset
Value
PV
Q
Current Value
Variable Name
%R00100
+00135
Current
Value
Reference
Address
Reference
Address
VersaPro
Logicmaster
Real Number Display Differences
There are differences between the way the programs display undefined results such as when a
divide by zero calculation is attempted. Appendix E of this manual discusses how Logicmaster
displays these results in both the ladder screen and reference tables.
F-2
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual – May 2002
GFK-0467M
Index
3
35x/36x/37x series CPUs: key switch, 2-15
A
ACOS, 6-11
ADD, 6-2
ADD_IOM, 2-25
ADD_SIO, 2-25
Addition function, 6-2
Addition of I/O module, 3-17
Alarm, 3-2
Alarm error codes, B-5
Alarm processor, 3-2
ALT keys, D-1
AND, 8-3
ANY_FLT, 2-25
APL_FLT, 2-25
Application fault, 3-11
Application program logic scan, 2-8
ARRAY_MOVE, 10-2
ASIN, 6-11
ATAN, 6-11
Auto Reset Statistics, 12-79
B
BAD_PWD, 2-25
Base 10 logarithm function, 6-13
Battery signal, low, 3-10
BCD-4, 2-23, 11-2
BCLR, 8-14
BIT, 2-23
Bit clear function, 8-14
Bit operation functions, 8-1
AND, 8-3
BCLR, 8-14
BPOS, 8-16
BSET, 8-14
BTST, 8-12
MCMP, 8-18
NOT, 8-7
OR, 8-3
ROL, 8-10
ROR, 8-10
SHL, 8-8
SHR, 8-8
XOR, 8-5
Bit position function, 8-16
Bit sequencer function, 9-11
Bit set function, 8-14
Bit test function, 8-12
BITSEQ, 9-11
memory required, 9-12
GFK-0467M
BLKCLR, 9-7
BLKMOV, 9-5
Block clear function, 9-7
Block locking feature, 2-40
EDITLOCK, 2-40
permanently locking a subroutine, 2-40
VIEWLOCK, 2-40
Block move function, 9-5
Boolean execution times, A-15
BPOS, 8-16
BSET, 8-14
BTST, 8-12
BYTE, 2-23
C
CALL, 12-2
Call function, 12-2
CFG_MM, 2-25
Change Programmer Communications
Window Mode and Timer Value, 12-43
Change System Comm Window Mode and
Timer Value, 12-45
Change/Read Constant Sweep Timer, 12-38
Change/Read Number of Words to Checksum,
12-47
Change/Read Time-of-Day Clock, 12-49
Checksum failure, program block, 3-10
Clear Fault Tables, 12-59
Clocks, 2-36
elapsed time clock, 2-36
time-of-day clock, 2-36
Coil
with Multiple and Single coil checking, 4-6
Coils, 4-2, 4-3
continuation coil, 4-8
negated coil, 4-4
negated retentive coil, 4-4
negative transition coil, 4-5
positive transition coil, 4-4
RESET coil, 4-5
retentive coil, 4-4
retentive RESET coil, 4-6
retentive SET coil, 4-6
SET coil, 4-5
COMMENT, 12-34
Comment function, 12-34
COMMREQ, 9-15
error code, description, and correction, 3-10
Communication request function, 9-15
error code, description, and correction, 3-10
Communication window modes, 2-14
Communications failure during store, 3-15
Communications with the PLC, 2-12, 2-13
Configuration mismatch, system, 3-9
Constant sweep time exceeded, 3-11
Index-1
Index
Constant sweep time mode, 2-13, 2-37
Constant sweep timer, 2-37
Contacts, 4-1
Continuation contact, 4-8
normally closed contact, 4-3
normally open contact, 4-3
Continuation coil, 4-8
Continuation contact, 4-8
Control functions, 12-1
CALL, 12-2
COMMENT, 12-34
DOIO, 12-3
enhanced DOIO for model 331 and higher
CPUs, 12-7
END, 12-23
ENDMCR, 12-30
JUMP, 12-31
LABEL, 12-33
MCR, 12-24
PID, 12-80
Sequential Event Recorder, 12-9
SER, 12-8
SVCREQ, 12-35
Conversion functions, 11-1
BCD-4, 11-2
DINT, 11-5
INT, 11-3
REAL, 11-7
TRUN, 11-11
WORD, 11-9
Convert to BCD-4 function, 11-2
Convert to double precision signed integer
function, 11-5
Convert to Real function, 11-7
Convert to signed integer function, 11-3
Convert to Word function, 11-9
Corrupted memory, 3-7
Corrupted user program on power-up, 3-12
COS, 6-11
Cosine function, 6-11
Counters
DNCTR, 5-13
function block data, 5-1
UPCTR, 5-11
CPU sweep, 2-2
CTRL keys, D-1
D
Data move functions, 9-1
BITSEQ, 9-11
BLKCLR, 9-7
BLKMOV, 9-5
COMMREQ, 9-15
MOVE, 9-2
SHFR, 9-8
Index-2
Data retentiveness, 2-22
Data types, 2-23
BCD-4, 2-23
BIT, 2-23
BYTE, 2-23
DINT, 2-23
INT, 2-23
REAL, 2-23
WORD, 2-23
Defaults conditions for Model 30 output
modules, 2-44
DEG, 6-15
Diagnostic data, 2-45
Diagnostic faults, 3-4
addition of I/O module, 3-17
application fault, 3-11
constant sweep time exceeded, 3-11
loss of I/O module, 3-16
loss of, or missing, option module, 3-8
low battery signal, 3-10
reset of, addition of, or extra, option module, 3-8
DINT, 2-23, 11-5
Discrete references, 2-21
discrete inputs, 2-21
discrete internal, 2-21
discrete outputs, 2-21
discrete temporary, 2-21
global data, 2-21
system status, 2-21, 2-24
DIV, 6-2
Division function, 6-2
DNCTR, 5-13
Do I/O function, 12-3
enhanced DO I/O function for model 331 and
higher CPUs, 12-7
DOIO, 12-3
enhanced DOIO for model 331 and higher
CPUs, 12-7
Double precision signed integer, 2-23
Down counter, 5-13
DSM communications with the PLC, 2-13
E
EDITLOCK, 2-40
Elapsed Power Down timer, 2-37
Elapsed time clock, 2-36
END, 12-23
End function, 12-23
End master control relay function, 12-30
ENDMCR, 12-30
Enhanced DO I/O function for the model 331
and higher CPUs, 12-7
EQ, 7-1
Equal function, 7-1
Error codes, B-5
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual–May 2002
GFK-0467M
Index
Ethernet communications, 2-45
Ethernet Global Data, 2-45
Examples
SER, 12-18
EXP, 6-13
Exponential functions, 6-13
power of e, 6-13
power of X, 6-13
EXPT, 6-13
External I/O failures, 3-2
F
Fast Backplane Status Access, 12-71
Fatal faults, 3-4
communications failure during store, 3-15
corrupted user program on power-up, 3-12
option module software failure, 3-10
PLC CPU system software failure, 3-13
program block checksum failure, 3-10
system configuration mismatch, 3-9
Fault action, 3-4
diagnostic faults, 3-4
fatal faults, 3-4
I/O fault action, B-11
informational faults, 3-4
PLC fault action, B-5
fault actions, 3-8
Fault category, 3-16
Fault description, 3-16
Fault effects, additional, 3-5
Fault explanations and correction, 3-1
accessing additional fault information, 3-6
addition of I/O module, 3-17
application fault, 3-11
communications failure during store, 3-15
constant sweep time exceeded, 3-11
corrupted user program on power-up, 3-12
fault category, 3-16
fault description, 3-16
fault handling, 3-2
fault type, 3-16
I/O fault group, B-10
I/O fault table, 3-5
I/O fault table explanations, 3-16
interpreting a fault, B-1
loss of I/O module, 3-16
loss of, or missing, option module, 3-8
low battery signal, 3-10
no user program present, 3-12
non-configurable faults, 3-8
option module software failure, 3-10
password access failure, 3-12
PLC CPU system software failure, 3-13
PLC fault group, B-4
PLC fault table, 3-5
PLC fault table explanations, 3-7
GFK-0467M
Index
program block checksum failure, 3-10
reset of, addition of, or extra, option module, 3-8
system configuration mismatch, 3-9
Fault group, B-4, B-10
Fault handling, 3-2
alarm processor, 3-2
fault action, 3-4
Fault references, 3-4
Fault type, 3-16
Faults, 3-2
accessing additional fault information, 3-6
actions, 3-8
addition of I/O module, 3-17
additional fault effects, 3-5
application fault, 3-11
classes of faults, 3-2
communications failure during store, 3-15
constant sweep time exceeded, 3-11
corrupted user program on power-up, 3-12
error codes, B-5
external I/O failures, 3-2
fault action, 3-4
I/O fault action, B-11
I/O fault group, B-10
I/O fault table, 3-3, 3-5
I/O fault table explanations, 3-16
internal failures, 3-2
interpreting a fault, B-1
loss of I/O module, 3-16
loss of, or missing, option module, 3-8
low battery signal, 3-10
no user program present, 3-12
operational failures, 3-2
option module software failure, 3-10
password access failure, 3-12
PLC CPU system software failure, 3-13
PLC fault action, B-5
PLC fault group, B-4
PLC fault table, 3-3, 3-5
PLC fault table explanations, 3-7
program block checksum failure, 3-10
references, 3-4
reset of, addition of, or extra, option module, 3-8
system configuration mismatch, 3-9
system reaction to faults, 3-3
Faults, interpreting, B-1
Flash protection on 35x/36x/37x series CPUs,
2-15
Floating-point numbers, E-1
entering and displaying floating-point numbers,
E-5
errors in floating-point numbers and operations,
E-6
internal format of floating-point numbers, E-3
values of floating-point numbers, E-4
Function block parameters, 2-29
Function block structure, 2-27
format of program function blocks, 2-27
Index-3
Index
format of relays, 2-27
function block parameters, 2-29
power flow, 2-30
G
GE, 7-1
Genius Global Data, 2-45
Global data, 2-45
Global data references, 2-21
Greater than function, 7-1
Greater than or equal function, 7-1
GT, 7-1
H
Horizontal link, 4-7
Housekeeping, 2-8
HRD_CPU, 2-25
HRD_FLT, 2-25
HRD_SIO, 2-25
I
I/O data formats, 2-44
I/O fault table, 3-3, 3-5, B-8
explanations, 3-16
fault action, B-11
fault actions for specific faults, B-11
fault address, B-9
fault group, B-10
fault specific data, B-11
fault time stamp, B-12
interpreting a fault, B-1
long/short indicator, B-9
point, B-10
rack, B-10
reference address, B-9
slot, B-10
symbolic fault specific data, B-11
I/O structure, Series 90-30 PLC, 2-41
I/O system , Series 90-30 PLC, 2-41
I/O system, Series 90-20 PLC, 2-41
model 20 I/O modules, 2-46
I/O system, Series 90-30 PLC
default conditions for Model 30 output modules,
2-44
diagnostic data, 2-45
global data, 2-45
I/O data formats, 2-44
model 30 I/O modules, 2-42
Informational faults, 3-4
no user program present, 3-12
password access failure, 3-12
Input references, discrete, 2-21
Input register references, analog, 2-20
Index-4
Input scan, 2-8
Instruction mnemonics, C-1
Instruction set
bit operation functions, 8-1
control functions, 12-1
conversion functions, 11-1
data move functions, 9-1
math functions, 6-1
relational functions, 7-1
relay functions, 4-1
table functions, 10-1
Instruction timing, A-1
35x-36x models, A-6
37x, A-11
SER, A-10
standard models, A-2
Instructions, programming
bit operation functions, 8-1
control functions, 12-1
conversion functions, 11-1
data move functions, 9-1
instruction mnemonics, C-1
math functions, 6-1
relational functions, 7-1
relay functions, 4-1
table functions, 10-1
INT, 2-23, 11-3
Internal failures, 3-2
Internal references, discrete, 2-21
Interrogate I/O, 12-68
Inverse cosine function, 6-11
Inverse sine function, 6-11
Inverse tangent function, 6-11
IO_FLT, 2-25
IO_PRES, 2-25
J
JUMP, 12-31
Jump instruction, 12-31
K
Key switch on 35x/36x/37x series CPUs, 2-15
L
LABEL, 12-33
Label instruction, 12-33
LE, 7-1
Less than function, 7-1
Less than or equal function, 7-1
Levels, privilege, 2-39
change requests, 2-40
Links, horizontal and vertical, 4-7
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual–May 2002
GFK-0467M
Index
LN, 6-13
Locking/unlocking subroutines, 2-40
LOG, 6-13
Logarithmic functions, 6-13
base 10 logarithm, 6-13
natural logarithm, 6-13
Logic solution, 2-8
Logical AND function, 8-3
Logical NOT function, 8-7
Logical OR function, 8-3
Logical XOR function, 8-5
LOS_IOM, 2-25
LOS_SIO, 2-25
Loss of I/O module, 3-16
Loss of, or missing, option module, 3-8
Low battery signal, 3-10
LOW_BAT, 2-25
LT, 7-1
M
Maintenance, 3-1
Manuals
for I/O modules, 2-42
Masked compare function, 8-18
Master control relay function, 12-24
Math functions, 6-1
ACOS, 6-11
ADD, 6-2
ASIN, 6-11
ATAN, 6-11
COS, 6-11
DEG, 6-15
DIV, 6-2
EXP, 6-13
EXPT, 6-13
LN, 6-13
LOG, 6-13
MOD, 6-7
MUL, 6-2
RAD, 6-15
SIN, 6-11
SQRT, 6-9
SUB, 6-2
TAN, 6-11
MCR, 12-24
Memory, corrupted, 3-7
Mnemonics, instruction, C-1
MOD, 6-7
Model 20 I/O modules, 2-46
Model 30 I/O modules, 2-42
Modulo function, 6-7
MOVE, 9-2
Move function, 9-2
MSKCMP, 8-18
MUL, 6-2
GFK-0467M
Index
Multiplication function, 6-2
N
NaN, E-6
Natural logarithm function, 6-13
NE, 7-1
Negated coil, 4-4
Negated retentive coil, 4-4
Negative transition coil, 4-5
Nested ENDMCR, 12-30
Nested MCR, 12-24
Nicknames, 2-22
No user program present, 3-12
Normally closed contact, 4-3
Normally open contact, 4-3
NOT, 8-7
Not a Number, E-6
Not equal function, 7-1
O
OFDT, 5-8
Off-delay timer, 5-8
On-delay timer, 5-3, 5-5
ONDTR, 5-3
Operation of system, 2-1
Operational failures, 3-2
Option module software failure, 3-10
OR, 8-3
Output references, discrete, 2-21
Output register references, analog, 2-20
Output scan, 2-9
OV_SWP, 2-24
Overrides, 2-22
P
Password access failure, 3-12
Passwords, 2-39
PB_SUM, 2-24
PCM communications with the PLC, 2-12
Periodic subroutines, 2-20
PID, 12-80
PLC CPU system software failure, 3-13
PLC fault table, 3-3, 3-5, B-1
error codes, B-5
explanations, 3-7
fault action, B-5
fault extra data, B-7
fault group, B-4
fault time stamp, B-7
interpreting a fault, B-1
long/short indicator, B-3
Index-5
Index
rack, B-3
slot, B-3
spare, B-3
task, B-3
PLC sweep, 2-2
application program logic scan, 2-8
configured constant sweep time mode, 2-13
constant sweep time mode, 2-13, 2-37
DSM communications with the PLC, 2-13
housekeeping, 2-8
input scan, 2-8
logic solution, 2-8
output scan, 2-9
PCM communications with the PLC, 2-12
programmer communications window, 2-9
scan time contributions for 35x/36x/37x series,
2-5, 2-6
standard program sweep mode, 2-2
standard program sweep variations, 2-13
STOP mode, 2-14
sweep time calculation, 2-7
system communications window, 2-10
PLC system operation, 2-1
Positive transition coil, 4-4
Power flow, 2-30
Power of e function, 6-13
Power of X function, 6-13
Power-down, 2-35
Power-up, 2-32
Power-up and power-down sequences, 2-32
power-down, 2-35
power-up, 2-32
Privilege level change requests, 2-40
Privilege levels, 2-39
change requests, 2-40
Program block
how blocks are called, 2-19
how C blocks are called, 2-19
how subroutines are called, 2-19
Program block checksum failure, 3-10
Program organization and user data
floating-point numbers, E-1
Program organization and user references/data,
2-17
data types, 2-23
function block structure, 2-27
retentiveness of data, 2-22
system status, 2-24
transitions and overrides, 2-22
user references, 2-20
Program structure
how blocks are called, 2-19
how C blocks are called, 2-19
how subroutines are called, 2-19
Program sweep, standard, 2-2
Programmer communications window, 2-9
Programming instructions
Index-6
bit operation functions, 8-1
control functions, 12-1
conversion functions, 11-1
data move functions, 9-1
instruction mnemonics, C-1
math functions, 6-1
relational functions, 7-1
relay functions, 4-1
table functions, 10-1
Proportional Integral Deviation (PID), 12-80
R
RAD, 6-15
Radian conversion function, 6-15
RANGE, 7-4
Range function, 7-4
Read after Fatal Fault Auto Reset, 12-77
Read Elapsed Power Down Time, 12-69
Read Elapsed Time Clock, 12-64
Read Folder Name, 12-55
Read I/O Override Status, 12-65
Read Last-Logged Fault Table Entry, 12-60
Read Master Checksum, 12-66
Read PLC ID, 12-56
Read PLC Run State, 12-57
Read Sweep Time from Beginning of Sweep,
12-54
Read Window Values, 12-41
REAL
convert to REAL, 11-7
Data type structure, 2-23
Using floating-point numbers, E-1
Using Real numbers, E-1
Real numbers
terminology, E-2
references, 2-21
Register Reference
system registers, 2-20
Register references, 2-20
analog inputs, 2-20
analog outputs, 2-20
Relational functions, 7-1
EQ, 7-1
GE, 7-1
GT, 7-1
LE, 7-1
LT, 7-1
NE, 7-1
RANGE, 7-4
Relay functions, 4-1
coils, 4-2, 4-3
contacts, 4-1
continuation coil, 4-8
continuation contact, 4-8
horizontal and vertical links, 4-7
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual–May 2002
GFK-0467M
Index
negated coil, 4-4
negated retentive coil, 4-4
negative transition coil, 4-5
normally closed contact, 4-3
normally open contact, 4-3
positive transition coil, 4-4
RESET coil, 4-5
retentive coil, 4-4
retentive RESET coil, 4-6
retentive SET coil, 4-6
SET coil, 4-5
RESET coil, 4-5
Reset of, addition of, or extra, option module,
3-8
Reset Smart Module, 12-67
Reset Watchdog Timer, 12-53
Retentive coil, 4-4
Retentive RESET coil, 4-6
Retentive SET coil, 4-6
Retentiveness of data, 2-22
ROL, 8-10
ROR, 8-10
Rotate left function, 8-10
Rotate right function, 8-10
S
Scan time contributions for 35x/36x/37x series
CPUs, 2-5, 2-6
Scan, input, 2-8
Scan, output, 2-9
Search array move function, 10-2
Search greater than or equal function, 10-7
Search less than or equal function, 10-7
Security, system, 2-39
locking/unlocking subroutines, 2-40
passwords, 2-39
privilege level change requests, 2-40
privilege levels, 2-39
Sequential Event Recorder, 12-9. See SER
function
SER function, 12-8
Series 90-20 PLC I/O system, 2-41
model 20 I/O modules, 2-46
Series 90-30 PLC I/O system, 2-41
default conditions for Model 30 output modules,
2-44
diagnostic data, 2-45
global data, 2-45
I/O data formats, 2-44
I/O structure, 2-41
model 30 I/O modules, 2-42
Service Request
change/read number of words to checksum, 1247
Service request functions
GFK-0467M
Index
auto reset statistics (#49), 12-79
change programmer communications window
(#3), 12-43
change system communications window (#4),
12-45
change/read constant sweep timer (#1), 12-38
change/read number of words to checksum, 1247
change/read time–of–day clock, 12-49
clear fault table, 12-59
Fast Backplane Status Access, 12-71
interrogate I/O, 12-68
list, 12-35
read elapsed power down time, 12-69
read elapsed time clock, 12-64
read folder name (#10), 12-55
read I/O override status, 12-65
read last–logged fault table entry, 12-60
read master checksum, 12-66
read PLC ID (#11), 12-56
read PLC run state (#12), 12-57
read sweep time (#9), 12-54
read window values (#2), 12-41
reboot after fatal fault auto reset (#48), 12-77
reset smart module (#24), 12-67
reset watchdog timer (#8), 12-53
shut down PLC, 12-58
skip next output and input scan, 12-70
SET coil, 4-5
SFT_CPU, 2-25
SFT_FLT, 2-25
SHFR, 9-8
Shift left function, 8-8
Shift register function, 9-8
Shift right function, 8-8
SHL, 8-8
SHR, 8-8
Shut Down PLC SVCREQ, 12-58
Signed integer, 2-23
SIN, 6-11
Sine function, 6-11
Skip Next Output & Input Scan, 12-70
SNPX_RD, 2-24
SNPX_WT, 2-24
SNPXACT, 2-24
Software failure, option module, 3-10
SQRT, 6-9
Square root function, 6-9
SRCH_GE, 10-7
SRCH_LE, 10-7
Standard program sweep mode, 2-2
Standard program sweep variations, 2-13
Status references, system, 2-21, 2-24
STOP mode, 2-14
STOR_ER, 2-25
SUB, 6-2
Index-7
Index
Subroutines, locking/unlocking, 2-40
Subtraction function, 6-2
Suspend I/O, 12-70
SVCREQ. See Service request functions
Sweep time calculation, 2-7
Sweep, PLC, 2-2
application program logic scan, 2-8
constant sweep time mode, 2-13, 2-37
DSM communications with the PLC, 2-13
housekeeping, 2-8
input scan, 2-8
logic solution, 2-8
output scan, 2-9
PCM communications with the PLC, 2-12
programmer communications window, 2-9
scan time contributions for 35x/36x/37x series
CPUs, 2-5, 2-6
standard program sweep mode, 2-2
standard program sweep variations, 2-13
STOP mode, 2-14
sweep time calculation, 2-7
system communications window, 2-10
SY_FLT, 2-25
SY_PRES, 2-25
System communications window, 2-10
System configuration mismatch, 3-9
System operation, 2-1
clocks and timers, 2-36
PLC sweep summary, 2-2
power-up and power-down sequences, 2-32
program organization and user references/data,
2-17
Series 90-20 PLC I/O system, 2-41
Series 90-30 PLC I/O system, 2-41
system security, 2-39
System register references, 2-20
System status references, 2-21, 2-24
ADD_IOM, 2-25
ADD_SIO, 2-25
ANY_FLT, 2-25
APL_FLT, 2-25
BAD_PWD, 2-25
CFG_MM, 2-25
HRD_CPU, 2-25
HRD_FLT, 2-25
HRD_SIO, 2-25
IO_FLT, 2-25
IO_PRES, 2-25
LOS_IOM, 2-25
LOS_SIO, 2-25
LOW_BAT, 2-25
OV_SWP, 2-24
PB_SUM, 2-24
SFT_CPU, 2-25
SFT_FLT, 2-25
SNPX_RD, 2-24
SNPX_WT, 2-24
SNPXACT, 2-24
Index-8
STOR_ER, 2-25
SY_FLT, 2-25
SY_PRES, 2-25
T
Table functions, 10-1
ARRAY_MOVE, 10-2
search less than or equal function, 10-7
SRCH_GE, 10-7
TAN, 6-11
Tangent function, 6-11
Temporary references, discrete, 2-21
Time-of-day clock, 2-36
Timers, 2-36
constant sweep timer, 2-37
Elapsed power down timer, 2-37
function block data, 5-1
OFDT, 5-8
ONDTR, 5-3
time-tick contacts, 2-38
TMR, 5-5
Watchdog timer, 2-37
Time-tick contacts, 2-38
Timing, instruction, A-1
35x-36x models, A-6
37x, A-11
SER, A-10
standard models, A-2
TMR, 5-5
Transitions, 2-22
Troubleshooting, 3-1
accessing additional fault information, 3-6
I/O fault table, 3-5
I/O fault table explanations, 3-16
interpreting a fault, B-1
non-configurable faults, 3-8
PLC fault table, 3-5
PLC fault table explanations, 3-7
TRUN, 11-11
Truncate function, 11-11
U
Up counter, 5-11
UPCTR, 5-11
User references, 2-20
analog inputs, 2-20
analog outputs, 2-20
discrete inputs, 2-21
discrete internal, 2-21
discrete outputs, 2-21
discrete references, 2-21
discrete temporary, 2-21
global data, 2-21
register references, 2-20
system registers, 2-20
Series 90™-30/20/Micro PLC CPU Instruction Set Reference Manual–May 2002
GFK-0467M
Index
system status, 2-21, 2-24
V
VersaPro
note to users, 1-2
Vertical link, 4-7
VIEWLOCK, 2-40
W
Watchdog timer, 2-37
Window
programmer communications window, 2-9
system communications window, 2-10
WORD, 2-23, 11-9
X
XOR, 8-5
GFK-0467M
Index
Index-9

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