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Sequence of Events H–25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
Optimizing MSG Time-Out H–26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
Example MSG Instruction Configuration H–27. . . . . . . . . . . . . . . . . . . . . . . . . . . . 
Example Scanner and Decoder Configuration H–28. . . . . . . . . . . . . . . . . . . . . . . . . 
Example Ladder Program H–29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
Index I–1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 
Preface
P-1
Preface
Read this preface to familiarize yourself with the rest of the manual. It provides
information concerning:
• who should use this manual
• purpose of this manual
• conventions used in this manual
Who Should Use this Manual
Use this manual if you are responsible for designing, installing, programming, or
troubleshooting control systems that use Allen–Bradley small logic controllers.
You should have a basic understanding of SLC 500 products. If you do not,
contact your local Allen–Bradley representative for the proper training before using
this product.
Purpose of this Manual
This manual is a reference guide for the SLC 500 processors and the 
MicroLogix 1000 controllers. This manual:
• provides status file functions
• provides the instructions used in your ladder logic programs
• complements the online help available at the terminal
PrefaceInstruction Set Reference Manual
P-2
Contents of this Manual
Chapter Title Contents
Preface Describes the purpose, background, and scope of this manual. Also specifies
the audience for whom this manual is intended.
1 Basic Instructions Describes how to use ladder logic instructions for relay replacement functions,
counting, and timing.
2 Comparison Instructions Describes the comparison instructions which allow you to compare values of
data.
3 Math Instructions Describes the math instructions which allow you to perform computation and
math operations on individual words.
4 Data Handling Instructions Describes how to perform data handling instructions, including move and logical
instructions and FIFO and LIFO instructions.
5 Program Flow Instructions Describes the ladder logic instructions that affect program flow and execution.
6 Application Specific
Instructions
Describes the bit shift, sequencer and STI related instructions.
7 Using High-Speed Counter
Instructions
Describes the four modes of the high-speed counter instruction and its related
instructions.
8 SLC Communication
Instructions
Describes the message and service communication instruction and their
associated parameters.
9 MicroLogix Communication
Instruction
Describes the message and service communication instruction and their
associated parameters.
10 Proportional Integral
Derivative Instruction
Describes the PID concept, equation, associated parameters, and control block
layout..
11 ASCII Instructions Describes the ASCII instructions and their usages.
12 Understanding Interrupt
Routines
Describes the selectable timed interrupts, the discrete input interrupt, and I/O
interrupts and their associated parameters.
13 Understanding the SLC
Communication Protocols
Explains the different types of communication protocols used with SLC 500
processors.
14
Understanding the
MicroLogix Communication
Protocols
Explains the different types of communication protocols used with SLC 500
processors.
15 Troubleshooting Faults Explains how to interpret and correct problems with the software and processor.
Appendix A MicroLogix 1000 Controller
Status File
Describes major and minor faults, diagnostic information, processor modes,
scan times, baud rates, and system node addresses for the MicroLogix 1000
controllers.
Appendix B SLC Status File
Describes major and minor faults, diagnostic information, processor modes,
scan times, baud rates, and system node addresses for the SLC 500
processors.
Preface
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Chapter ContentsTitle
Appendix C Memory Usage and
Instruction Execution Times
Provides the user memory capacity and instruction execution times. Also
describes how to estimate the total memory usage of a system.
Appendix D Estimating Scan Time Provides interrupt latency, M0/M1 access time information, and worksheets for
estimating scan times.
Appendix E Programming Instruction
References
Provides a listing of instructions with their parameters and valid file types.
Appendix F Data File Organization and
Addressing
Provides details on data files, covering file formats and how to create and delete
data.
Appendix G Number Systems Describes the hexadecimal, binary, and decimal numbering systems along with
the floating point format.
Appendix H Application Example
Programs
Provides advanced application examples for the high-speed counter, sequencer,
and bit shift instructions.
Related Documentation
The following documents contain additional information concerning Allen–Bradley
SLC products. To obtain a copy, contact your local Allen–Bradley office or
distributor.
For Read this Document
An overview of the SLC 500 family of products SLC 500 System Overview
An introduction to APS for first–time users, containing basic
concepts but focusing on simple tasks and exercises, and
allowing the reader to begin programming in the shortest time
possible
APS Quick Start for New Users
A procedural and reference manual for technical personnel
who use the APS import/export utility to convert APS files to
ASCII and conversely ASCII to APS files
APS Import/Export User Manual
A training and quick reference guide to APS
SLC 500 Software Programmer’s Quick Reference Guide,
Publication Number ABT-1747-TSJ50available on
PASSPORT at a list price of $50.00
A guide of common procedures used in APS
SLC 500 Software Common Procedures Guide, Publication
Number ABT-1747-TSJ50available on PASSPORT at a list
price of $50.00
A procedural manual for technical personnel who use APS to
develop control applications
Rockwell Software Advanced Programming Software (APS)
User Manual
A description on how to install and use your Fixed SLC 500
programmable controller
Installation and Operation Manual for Fixed Hardware Style
Programmable Controllers, Catalog Number 1747-6.1
PrefaceInstruction Set Reference Manual
P-4
For Read this Document
A description on how to install and use your Modular SLC 500
programmable controller
Installation and Operation Manual for Modular Hardware Style
Programmable Controllers, Publication Number 1747-6.2
A description on how to install and use your MicroLogix 1000
controllers. This manual also contains status file data and
instruction set information for the micro controllers.
MicroLogix 1000 Controllers User Manual, Publication Number
1761-6.3.
A complete listing of current Allen–Bradley documentation,
including ordering instructions. Also indicates whether the
documents are available on CD–ROM or in multi–languages.
Allen–Bradley Publication Index, Publication Number SD499
A glossary of industrial automation terms and abbreviations Allen–Bradley Industrial Automation Glossary, Publication
Number AG-7.1
Common Techniques Used in this Manual
The following conventions are used throughout this manual:
• Bulleted lists provide information, not procedural steps.
• Numbered lists provide sequential steps or hierarchical information.
• Text in this font indicates words or phrases you should type.
• Italic type is used for