Allen-Bradley micrologix 1500 User manual

MicroLogix™ 1500
Programmable
Controllers
Bulletin 1764
User Manual

Important User Information
Because of the variety of uses for the products described in this
publication, those responsible for the application and use of this
control equipment must satisfy themselves that all necessary steps
have been taken to assure that each application and use meets all
performance and safety requirements, including any applicable laws,
regulations, codes and standards.
The illustrations, charts, sample programs and layout examples shown
in this guide are intended solely for purposes of example. Since there
are many variables and requirements associated with any particular
installation, Allen-Bradley does not assume responsibility or liability
(to include intellectual property liability) for actual use based upon
the examples shown in this publication.
Allen-Bradley publication SGI-1.1, Safety Guidelines for the
Application, Installation and Maintenance of Solid-State Control
(available from your local Allen-Bradley office), describes some
important differences between solid-state equipment and
electromechanical devices that should be taken into consideration
when applying products such as those described in this publication.
Reproduction of the contents of this copyrighted publication, in whole
or part, without written permission of Rockwell Automation, is
prohibited.
Throughout this publication, notes may be used to make you aware of
safety considerations. The following annotations and their
accompanying statements help you to identify a potential hazard,
avoid a potential hazard, and recognize the consequences of a
potential hazard:
MicroLogix, Compact I/O, and RSLogix are trademarks of Rockwell Automation.
WARNING
!
Identifies information about practices or
circumstances that can cause an explosion in a
hazardous environment, which may lead to personal
injury or death, property damage, or economic loss.
ATTENTION
!
Identifies information about practices or
circumstances that can lead to personal injury or
death, property damage, or economic loss.
IMPORTANT Identifies information that is critical for successful
application and understanding of the product.

iii Publication 1764-UM001B-EN-P - March 2002
Summary of Changes
The information below summarizes the changes to this manual since
the last printing.
To help you find new and updated information in this release of the
manual, we have included change bars as shown to the right of this
paragraph.
The table below lists the sections that document new features and
additional or updated information on existing features.
For this information: See
Series C support for up to 16 expansion I/O
modules
Chapter 1
List of controller series, OS FRN numbers,
and RSLogix versions
Page 1-5
Updated list of recommended surge
suppressors
Page 3-6
Ethernet Connectivity Page 4-23
Typical CPU hold-up time Page A-1
Updated system loading and heat
dissipation worksheets
Appendix F
System loading graphs for 1769 power
supplies, including 1769-PA4 and 1769-PB4
pages F-5 through F-7

Publication 1764-UM001B-EN-P - March 2002
Summary of Changes iv

vPublication 1764-UM001B-EN-P - April 2002
Table of Contents
Preface
Who Should Use this Manual. . . . . . . . . . . . . . . . . . . . . . . P-1
Purpose of this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . P-1
Related Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . P-1
Common Techniques Used in this Manual . . . . . . . . . . . . . P-3
Rockwell Automation Support . . . . . . . . . . . . . . . . . . . . . . P-3
Local Product Support . . . . . . . . . . . . . . . . . . . . . . . . . P-3
Technical Product Assistance . . . . . . . . . . . . . . . . . . . . P-3
Your Questions or Comments on this Manual . . . . . . . . P-4
Chapter 1
Hardware Overview
Hardware Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
MicroLogix 1500 Component Descriptions . . . . . . . . . . . . . 1-2
Base Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Processors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Data Access Tool (Catalog Number 1764-DAT) . . . . . . . 1-3
Memory Modules/Real-Time Clock . . . . . . . . . . . . . . . . 1-4
Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Communication Options . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Compact™ Expansion I/O . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
End Cap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Expansion Power Supply and Cables . . . . . . . . . . . . . . 1-7
System Requirements for Using Expansion Modules . . . 1-7
Adding an I/O Bank . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
Addressing Expansion I/O . . . . . . . . . . . . . . . . . . . . . . 1-11
Expansion I/O Power Failure . . . . . . . . . . . . . . . . . . . . 1-11
Chapter 2
Installing Your Controller
Agency Certifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Compliance to European Union Directives . . . . . . . . . . . . . 2-1
EMC Directive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Low Voltage Directive . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Installation Considerations. . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Hazardous Location Considerations . . . . . . . . . . . . . . . 2-3
Disconnecting Main Power. . . . . . . . . . . . . . . . . . . . . . 2-4
Safety Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4
Power Distribution. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Periodic Tests of Master Control Relay Circuit . . . . . . . . 2-5
Power Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Isolation Transformers . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Power Supply Inrush . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6
Loss of Power Source. . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

Publication 1764-UM001B-EN-P - April 2002
Table of Contents vi
Input States on Power Down . . . . . . . . . . . . . . . . . . . . 2-6
Other Types of Line Conditions . . . . . . . . . . . . . . . . . . 2-7
Preventing Excessive Heat. . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Master Control Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Using Emergency-Stop Switches . . . . . . . . . . . . . . . . . . 2-9
Schematic (Using IEC Symbols) . . . . . . . . . . . . . . . . . . 2-10
Schematic (Using ANSI/CSA Symbols). . . . . . . . . . . . . . 2-11
Base Unit Mounting Dimensions . . . . . . . . . . . . . . . . . . . . 2-12
Controller Spacing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12
Mounting the Controller . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
Using a DIN Rail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14
Base Unit Panel Mounting . . . . . . . . . . . . . . . . . . . . . . 2-16
Installing Controller Components. . . . . . . . . . . . . . . . . . . . 2-17
Prevent Electrostatic Discharge . . . . . . . . . . . . . . . . . . . 2-17
Processor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17
Data Access Tool (DAT). . . . . . . . . . . . . . . . . . . . . . . . 2-19
Memory Module/Real-Time Clock. . . . . . . . . . . . . . . . . 2-20
Compact I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22
Chapter 3
Wiring Your Controller
Wiring Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Wiring Recommendation . . . . . . . . . . . . . . . . . . . . . . . 3-2
Using Surge Suppressors . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Recommended Surge Suppressors . . . . . . . . . . . . . . . . 3-6
Grounding the Controller . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
Miswiring - 1764-28BXB Only. . . . . . . . . . . . . . . . . . . . 3-8
Terminal Block Layouts . . . . . . . . . . . . . . . . . . . . . . . . 3-9
Terminal Groupings . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
Sinking and Sourcing Input Circuits . . . . . . . . . . . . . . . . . . 3-10
1764-24AWA Wiring Diagram . . . . . . . . . . . . . . . . . . . . 3-11
1764-24BWA Wiring Diagram with Sinking Inputs . . . . . 3-12
1764-24BWA Wiring Diagram with Sourcing Inputs . . . . 3-13
1764-28BXB Wiring Diagram with Sinking Inputs . . . . . 3-14
1764-28BXB Wiring Diagram with Sourcing Outputs . . . 3-15
Controller I/O Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-16
Minimizing Electrical Noise. . . . . . . . . . . . . . . . . . . . . . 3-16
Transistor Output Transient Pulses . . . . . . . . . . . . . . . . 3-16
Chapter 4
Communication Connections
Default Communication Configuration . . . . . . . . . . . . . . . . 4-1
Communications Toggle Push Button. . . . . . . . . . . . . . . . . 4-2
Connecting to the RS-232 Port . . . . . . . . . . . . . . . . . . . . . . 4-3
DF1 Full-Duplex Communication Parameters . . . . . . . . 4-3
Making a DF1 Full-Duplex Point-to-Point Connection . . 4-3

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Table of Contents vii
Using a Modem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
Isolated Modem Connection. . . . . . . . . . . . . . . . . . . . . 4-5
Connecting to a DF1 Half-Duplex Network. . . . . . . . . . 4-7
Connecting to a DH-485 Network . . . . . . . . . . . . . . . . . . . 4-10
DH-485 Configuration Parameters. . . . . . . . . . . . . . . . . 4-12
Recommended Tools . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12
DH-485 Communication Cable . . . . . . . . . . . . . . . . . . . 4-12
Communication Cable Connection to the
DH-485 Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13
Connecting the AIC+ . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15
Connecting to DeviceNet . . . . . . . . . . . . . . . . . . . . . . . . . 4-22
Cable Selection Guide . . . . . . . . . . . . . . . . . . . . . . . . . 4-22
Connecting to Ethernet . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-23
Ethernet Connections . . . . . . . . . . . . . . . . . . . . . . . . . . 4-23
RS-232 Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-24
Chapter 5
Using Trim Pots and the Data
Access Tool (DAT)
Trim Pot Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Trim Pot Information Function File . . . . . . . . . . . . . . . . 5-2
Error Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
Data Access Tool (DAT) . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
DAT Keypad and Indicator Light Functions. . . . . . . . . . 5-2
Power-Up Operation . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3
DAT Function File . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-4
Power Save Timeout (PST) Parameter . . . . . . . . . . . . . . 5-4
Understanding the DAT Display . . . . . . . . . . . . . . . . . . 5-5
Entering Bit Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
Entering Integer Mode . . . . . . . . . . . . . . . . . . . . . . . . . 5-6
Monitoring and Editing. . . . . . . . . . . . . . . . . . . . . . . . . 5-6
F1 and F2 Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7
Working Screen Operation . . . . . . . . . . . . . . . . . . . . . . 5-7
Non-Existent Elements . . . . . . . . . . . . . . . . . . . . . . . . . 5-8
Controller Faults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-8
Error Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9
Chapter 6
Using Real-Time Clock and
Memory Modules
Real-Time Clock Operation . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Removal/Insertion Under Power. . . . . . . . . . . . . . . . . . 6-1
Real-Time Clock Function File . . . . . . . . . . . . . . . . . . . 6-1
Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
Writing Data to the Real-Time Clock. . . . . . . . . . . . . . . 6-2
RTC Battery Operation . . . . . . . . . . . . . . . . . . . . . . . . . 6-2
Memory Module Operation . . . . . . . . . . . . . . . . . . . . . . . . 6-3
User Program and Data Back-Up . . . . . . . . . . . . . . . . . 6-3
Program Compare . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4

Publication 1764-UM001B-EN-P - April 2002
Table of Contents viii
Data File Download Protection. . . . . . . . . . . . . . . . . . . 6-4
Memory Module Write Protection . . . . . . . . . . . . . . . . . 6-5
Removal/Insertion Under Power. . . . . . . . . . . . . . . . . . 6-5
Memory Module Information File . . . . . . . . . . . . . . . . . 6-5
Appendix A
Specifications
Controller Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
Choosing a Power Supply . . . . . . . . . . . . . . . . . . . . . . A-2
Transistor Output Transient Pulses . . . . . . . . . . . . . . . . A-8
Controller Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . A-9
Compact I/O Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . A-9
Panel Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-9
End Cap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-10
Appendix B
Replacement Parts
MicroLogix 1500 Replacement Kits. . . . . . . . . . . . . . . . . . . B-1
Lithium Battery (1747-BA) . . . . . . . . . . . . . . . . . . . . . . . . B-2
Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2
Battery Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-3
Storing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-3
Transporting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-3
Disposing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-4
Replacement Terminal Blocks . . . . . . . . . . . . . . . . . . . . . . B-5
Replacement Doors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-6
Base Terminal Door (1764-RPL-TDR1) . . . . . . . . . . . . . B-6
Processor Access Door (1764-RPL-CDR1) . . . . . . . . . . . B-6
Base Comms Door
(included in 1764-RPL-DR) . . . . . . . . . . . . . . . . . . . . . . B-6
Trim Pots/Mode Switch Cover Door
(included in 1764-RPL-DR) . . . . . . . . . . . . . . . . . . . . . . B-6
Appendix C
Troubleshooting Your System
Understanding Controller LEDs . . . . . . . . . . . . . . . . . . . . . C-1
When Operating Normally . . . . . . . . . . . . . . . . . . . . . . C-2
When an Error Exists . . . . . . . . . . . . . . . . . . . . . . . . . . C-2
Controller Error Recovery Model . . . . . . . . . . . . . . . . . . . . C-3
Identifying Controller Faults . . . . . . . . . . . . . . . . . . . . . . . C-4
Automatically Clearing Faults . . . . . . . . . . . . . . . . . . . . C-4
Manually Clearing Faults Using the Fault Routine . . . . . C-4
Fault Messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-5
Calling Rockwell Automation for Assistance . . . . . . . . . . . . C-5

Publication 1764-UM001B-EN-P - April 2002
Table of Contents ix
Appendix D
Upgrading Your Operating System
Preparing for Upgrade. . . . . . . . . . . . . . . . . . . . . . . . . . . . D-1
Performing the Upgrade . . . . . . . . . . . . . . . . . . . . . . . . . . D-2
Missing/Corrupt OS LED Pattern . . . . . . . . . . . . . . . . . . . . D-2
Appendix E
Understanding Communication
Protocols
RS-232 Communication Interface . . . . . . . . . . . . . . . . . . . . E-1
DF1 Full-Duplex Protocol . . . . . . . . . . . . . . . . . . . . . . . . . E-1
DF1 Half-Duplex Protocol . . . . . . . . . . . . . . . . . . . . . . . . . E-2
DF1 Half-Duplex Operation . . . . . . . . . . . . . . . . . . . . . E-2
Considerations When Communicating as a DF1 Slave
on a Multi-drop Link . . . . . . . . . . . . . . . . . . . . . . . . . . E-3
Using Modems with MicroLogix 1500
Programmable Controllers . . . . . . . . . . . . . . . . . . . . . . . . . E-3
Dial-Up Phone Modems . . . . . . . . . . . . . . . . . . . . . . . . E-4
Leased-Line Modems . . . . . . . . . . . . . . . . . . . . . . . . . . E-4
Radio Modems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-5
Line Drivers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-5
DH-485 Communication Protocol. . . . . . . . . . . . . . . . . . . . E-5
DH-485 Network Description . . . . . . . . . . . . . . . . . . . . E-5
DH-485 Token Rotation . . . . . . . . . . . . . . . . . . . . . . . . E-6
DH-485 Configuration Parameters. . . . . . . . . . . . . . . . . E-6
Devices that Use the DH-485 Network . . . . . . . . . . . . . E-7
Important DH-485 Network Planning Considerations. . . E-8
Modbus RTU Slave Communication Protocol
(MicroLogix 1764-LSP and 1764-LRP Series B and
later processors only) . . . . . . . . . . . . . . . . . . . . . . . . . . . E-13
ASCII Protocol (MicroLogix 1500 1764-LSP
and 1764-LRP Series B and later Processors only) . . . . . . . E-13
Appendix F
System Loading and Heat
Dissipation
System Loading Limitations . . . . . . . . . . . . . . . . . . . . . . . . F-1
System Expansion Calculations . . . . . . . . . . . . . . . . . . . . . F-1
Selecting System Devices . . . . . . . . . . . . . . . . . . . . . . . F-2
Verifying the System Loading . . . . . . . . . . . . . . . . . . . . F-4
Calculating Heat Dissipation . . . . . . . . . . . . . . . . . . . . . . . F-9
Glossary
Index

Publication 1764-UM001B-EN-P - April 2002
Table of Contents x

P-1 Publication 1764-UM001B-EN-P - April 2002
Preface
Read this preface to familiarize yourself with the rest of the manual. It
provides information concerning:
•who should use this manual
•the purpose of this manual
•related documentation
•conventions used in this manual
•Rockwell Automation support
Who Should Use this
Manual
Use this manual if you are responsible for designing, installing,
programming, or troubleshooting control systems that use
MicroLogix 1500 controllers.
You should have a basic understanding of electrical circuitry and
familiarity with relay logic. If you do not, obtain the proper training
before using this product.
Purpose of this Manual
This manual is a reference guide for MicroLogix 1500 controllers. It
describes the procedures you use to install, wire, and troubleshoot
your controller. This manual:
•explains how to install and wire your controllers
•gives you an overview of the MicroLogix 1500 controller system
Refer to publication 1762-RM001, MicroLogix 1200 and MicroLogix
1500 Programmable Controllers Instruction Set Reference Manual for
the MicroLogix 1200 and 1500 instruction set and for application
examples to show the instruction set in use. Refer to your
programming software user documentation for more information on
programming your MicroLogix 1500 controller.
Related Documentation
The documents listed on page P-2 contain additional information
concerning Rockwell Automation products. If you would like a copy,
you can:
•download a free electronic version from the internet:
www.ab.com/micrologix or www.theautomationbookstore.com
•purchase a printed manual by:
–contacting your local distributor or Rockwell Automation
representative
–visiting www.theautomationbookstore.com and placing your
order
–calling 1.800.963.9548 (USA/Canada)
or 001.330.725.1574 (Outside USA/Canada)

Publication 1764-UM001B-EN-P - April 2002
Preface P-2
For Read this Document Document Number
A technical overview of the MicroLogix 1500 and related
products
MicroLogix 1500 Programmable Controllers
Technical Data
1764-TD001
Information on the MicroLogix 1500 Controllers instruction set MicroLogix 1200 and 1500 Programmable
Controllers Instruction Set Reference Manual
1762-RM001
Information on mounting and wiring the MicroLogix 1500 Base
Units, including a mounting template for easy installation
MicroLogix 1500 Programmable Controllers
Base Unit Installation Instructions
1764-IN001
An overview of Compact I/O Compact I/O System Overview 1769-SO001
More information on Compact I/O Power Supplies and Cables 1769 Compact I/O Power Supplies and
Communication Bus Expansion Cables
Technical Data
1769-TD001
More information on Compact Analog I/O and Temperature Input
Modules
Compact Analog I/O and Temperature Input
Modules Technical Data
1769-TD004
Detailed information on using Compact I/O Analog Modules Compact I/O Analog Modules User Manual 1769-UM002
Detailed information on installing, configuring, and using
1769-IT6 Thermocouple/mV Input Modules
Compact I/O 1769-IT6 Thermocouple/mV
Input Module User Manual
1769-UM004
Detailed information on installing, configuring, and using
1769-IR6 RTD/Resistance Input Modules
Compact I/O 1769-IR6 RTD/Resistance Input
Module User Manual
1769-UM005
Detailed information on installing, configuring, and using
1769-HSC High Speed Counter Modules
Compact 1769-HSC High Speed Counter
Module User Manual
1769-UM006
A description on how to install and connect an AIC+. This
manual also contains information on network wiring.
Advanced Interface Converter (AIC+) User
Manual
1761-6.4
Information on how to install, configure, and commission a DNI DeviceNet™ Interface User Manual 1761-6.5
Information on installing, connecting, and configuring an ENI Ethernet Interface User Manual 1761-UM001
Information on installing, configuring, and using a DeviceNet
Scanner
Compact™ I/O 1769-SDN DeviceNet Scanner
User Manual
1761-UM009
Information on DF1 open protocol. DF1 Protocol and Command Set Reference
Manual
1770-6.5.16
In-depth information on grounding and wiring Allen-Bradley
programmable controllers
Allen-Bradley Programmable Controller
Grounding and Wiring Guidelines
1770-4.1
A description of important differences between solid-state
programmable controller products and hard-wired
electromechanical devices
Application Considerations for Solid-State
Controls
SGI-1.1
An article on wire sizes and types for grounding electrical
equipment
National Electrical Code - Published by the National Fire Protection
Association of Boston, MA.
A complete listing of current documentation, including ordering
instructions. Also indicates whether the documents are available
on CD-ROM or in multi-languages.
Allen-Bradley Publication Index SD499
A glossary of industrial automation terms and abbreviations Allen-Bradley Industrial Automation Glossary AG-7.1

Publication 1764-UM001B-EN-P - April 2002
Preface P-3
Common Techniques Used
in this Manual
The following conventions are used throughout this manual:
•Bulleted lists such as this one provide information, not
procedural steps.
•Numbered lists provide sequential steps or hierarchical
information.
•Italic type is used for emphasis.
Rockwell Automation
Support
Rockwell Automation offers support services worldwide, with over 75
Sales/Support Offices, 512 authorized Distributors and 260 authorized
Systems Integrators located throughout the United States alone, plus
Rockwell Automation representatives in every major country in the
world.
Local Product Support
Contact your local Rockwell Automation representative for:
•sales and order support
•product technical training
•warranty support
•support service agreements
Technical Product Assistance
Before you contact Rockwell Automation for technical assistance, we
suggest you please review the troubleshooting information contained
in this publication first.

Publication 1764-UM001B-EN-P - April 2002
Preface P-4
If the problem persists, call your local Rockwell Automation
representative or contact Rockwell Automation in one of the following
ways:
Your Questions or Comments on this Manual
If you find a problem with this manual, or you have any suggestions
for how this manual could be made more useful to you, please
contact us at the address below:
Rockwell Automation
Automation Control and Information Group
Technical Communication, Dept. A602V
P.O. Box 2086
Milwaukee, WI 53201-2086
or visit our internet page at:
http://www.rockwellautomation.com
For the latest information on MicroLogix controllers, visit
www.ab.com/micrologix
Phone United
States/Canada
1.440.646.5800
Outside United
States/Canada
You can access the phone number for your
country via the Internet:
1. Go to http://www.ab.com
2. Click on
Product Support
(http://support.automation.rockwell.com)
3. Under
Support Centers , click on Contact
Information
Internet ⇒1. Go to http://www.ab.com
2. Click on
Product Support
(http://support.automation.rockwell.com)

1Publication 1764-UM001B-EN-P - April 2002
Chapter 1
Hardware Overview
Hardware Features
The MicroLogix 1500 programmable controller is composed of a base
unit, which contains a power supply, input and output circuits, and a
processor. The controller is available with 24 or 28 points of
embedded I/O. Additional I/O may be added using Compact™ I/O.
The hardware features of the controller are:
RUN PROG
REM
12
3
4
5
6
7
1
8
9
10
11
12
10
Feature Description Feature Description
1 Removable Terminal Blocks 7 Memory Module/Real-Time Clock(1)
(1) Optional.
2 Interface to Expansion I/O,
Removable ESD Barrier
8Replacement Battery(1)
3 Input LEDs 9 Battery
4 Output LEDs 10 Terminal Doors and Label
5 Communication Port 11 Data Access Tool(1)
6 Status LEDs 12 Mode Switch, Trim Pots

Publication 1764-UM001B-EN-P - April 2002
1-2 Hardware Overview
MicroLogix 1500
Component Descriptions
A controller is composed of a processor (1764-LSP or enhanced
1764-LRP with RS-232 port) and one of the base units listed below.
The FET transistor outputs are available on the 1764-28BXB base only.
Base Units
Catalog
Number
Line Power Inputs Outputs High Speed I/O
1764-24AWA 120/240V ac (12) 120V ac (12) Relay, 2 isolated relays
per unit
n/a
1764-24BWA 120/240V ac (8) Standard 24V dc
(4) Fast 24V dc
(12) Relay, 2 isolated relays
per unit
(4) 20 kHz input
1764-28BXB 24V dc (8) Standard 24V dc
(8) Fast 24V dc
(6) Relay, 2 isolated relays
per unit
(4) Standard 24V dc FET
(2) Fast 24V dc FET
(8) 20 kHz input
(2) 20 kHz output

Publication 1764-UM001B-EN-P - April 2002
Hardware Overview 1-3
Processors
Processor (Catalog Number 1764-LSP)
Processor (Catalog Number 1764-LRP)
Data Access Tool (Catalog Number 1764-DAT)
Communications Port
•DTE (male) 9-pin D-shell
connector
•30V dc isolation
1764-DAT
mounted on
1764-LSP
processor.

Publication 1764-UM001B-EN-P - April 2002
1-4 Hardware Overview
Memory Modules/Real-Time Clock
The following memory modules and real-time clock modules are
available:
Cables
Use only the following communication cables in Class I, Division 2
hazardous locations.
Memory module
mounted on
1764-LSP
processor.
Catalog Number Function Memory Size
1764-RTC Real-Time Clock not applicable
1764-MM1 Memory Module 8K
1764-MM1RTC Memory Module and Real-Time Clock 8K
1764-MM2(1)
(1) For 1764-LRP programs greater than 8k, use the 1764-MM2 or 1764-MM2RTC.
Memory Module 16K
1764-MM2RTC(1) Memory Module and Real-Time Clock 16K
Table 1.1 Cables for Use in Class I, Division 2 Hazardous Environment
1761-CBL-PM02 Series C or later 2707-NC8 Series B or later
1761-CBL-HM02 Series C or later 2707-NC9 Series B or later
1761-CBL-AM00 Series C or later 2707-NC10 Series B or later
1761-CBL-AP00 Series C or later 2707-NC11 Series B or later

Publication 1764-UM001B-EN-P - April 2002
Hardware Overview 1-5
Programming
Programming the MicroLogix 1500 programmable controller is done
using RSLogix™ 500, Rev. 4.0 or later. Certain features are only
available when using the most current version of the software, as
noted in System Requirements for Using Expansion Modules on page
1-7.
The following table lists the firmware release numbers, feature and
functionality enhancements, and the required version of RSLogix 500
and RSLogix 500 Starter software.
Table 1.B Required Software Version by FRN Number
Controller Firmware
Release
Available
for Sale
Date
Catalog
Number
Series
Catalog
Number
Revision
OS FRN
Number
Feature and Functionality
Changes
Required
Version of
RSLogix
500/RSLogix
500 Starter
Software
1764-LSP
Initial
Release
February
1999
AB 2 Initial Release 3.01.00
Enhancement October
1999
AC 3 Power Supply and Expansion Cable
Compatibility
3.01.00
Series B
Release
March
2000
BA 4 String Data File Type,
ASCII Instruction Set,
Modbus RTU Slave Protocol,
Ramping (when using PWM outputs),
Static Data File Protection,
RTC Messaging
4.00.00
Enhancement October
2000
BB 5 PTO Controlled Stop,
Memory Module Program Compare Bit
Enhancement
4.50.00
Series C
Release
September
2001
CA 6 Floating Point Data File Support,
Programmable Limit Switch (PLS),
Real Time Clock Adjust (Copy Word),
Absolute Value,
Gray Code,
Recipe,
Message Instruction Support for
1769-SDN
5.10.00
1764-LRP
Initial
Release
March
2000
BA 4 Initial Release - Same Functionality as
1764-LSP
4.00.00
Enhancement October
2000
BB 5 PTO Controlled Stop,
Memory Module Program Compare Bit
Enhancement
4.50.00
Series C
Release
September
2001
CA 6 Floating Point Data File Support,
Programmable Limit Switch (PLS),
Real Time Clock Adjust (Copy Word),
Absolute Value,
Gray Code,
Recipe,
Message Instruction Support for
1769-SDN
5.10.00

Publication 1764-UM001B-EN-P - April 2002
1-6 Hardware Overview
Communication Options
The MicroLogix 1500 can be connected to a personal computer. It can
also be connected to the DH-485 network using an Advanced
Interface Converter (1761-NET-AIC), to an Ethernet network using an
Ethernet Interface (1761-NET-ENI), or to a DeviceNet™ network using
a DeviceNet Interface (1761-NET-DNI) or through the DeviceNet
Scanner module (1769-SDN). The controller can also be connected to
Modbus™ SCADA networks as an RTU slave. See Communication
Connections on page 4-1 for more information on connecting to the
available communication options.
The 1764-LRP processor provides an additional communication port.
Each of the communications ports can be independently configured
for any supported communication protocol. (Channel 0 is on the base
unit and Channel 1 is on the 1764-LRP processor.)
Compact™ Expansion I/O
Compact expansion I/O (Bulletin 1769) can be connected to the
MicroLogix 1500 Controller. A maximum of either 8 or 16 expansion
I/O modules can be used, depending upon your system. See System
Requirements for Using Expansion Modules on page 1-7.
See System Loading and Heat Dissipation on page F-1 for more
information on system configurations.
End Cap
An end cap terminator (catalog number 1769-ECR or 1769-ECL) must
be used at the end of the group of I/O modules attached to the
MicroLogix 1500 Controller. The end cap terminator is not provided
with the base or processor units. It is required when using expansion
I/O.
This illustration shows the right end cap (1769-ECR ). The left end cap
(1769-ECL) is shown on page 1-10.