Allen-Bradley MicroLogix 1200 User manual

MicroLogix™ 1200
Programmable
Controllers
Bulletin 1762 Controllers and
Expansion I/O
User Manual

Important User Information
Solid state equipment has operational characteristics differing from those of
electromechanical equipment. Safety Guidelines for the Application,
Installation and Maintenance of Solid State Controls (Publication SGI-1.1
available from your local Rockwell Automation sales office or online at
http://www.ab.com/manuals/gi) describes some important differences
between solid state equipment and hard-wired electromechanical devices.
Because of this difference, and also because of the wide variety of uses for
solid state equipment, all persons responsible for applying this equipment
must satisfy themselves that each intended application of this equipment is
acceptable.
In no event will Rockwell Automation, Inc. be responsible or liable for
indirect or consequential damages resulting from the use or application of
this equipment.
The examples and diagrams in this manual are included solely for illustrative
purposes. Because of the many variables and requirements associated with
any particular installation, Rockwell Automation, Inc. cannot assume
responsibility or liability for actual use based on the examples and diagrams.
No patent liability is assumed by Rockwell Automation, Inc. with respect to
use of information, circuits, equipment, or software described in this manual.
Reproduction of the contents of this manual, in whole or in part, without
written permission of Rockwell Automation, Inc. is prohibited.
Throughout this manual we use notes to make you aware of safety
considerations.
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.
IMPORTANT Identifies information that is critical for successful
application and understanding of the product.
ATTENTION Identifies information about practices or circumstances
that can lead to personal injury or death, property
damage, or economic loss. Attentions help you:
•identify a hazard
•avoid a hazard
•recognize the consequence
SHOCK HAZARD Labels may be located on or inside the drive to alert
people that dangerous voltage may be present.
BURN HAZARD Labels may be located on or inside the drive to alert
people that surfaces may be dangerous temperatures.

1Publication 1762-UM001D-EN-P - March 2004
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 about existing features.
For this information See
MicroLogix 1200 controllers with the
additional communications port
(Programmer/HMI Port)
•hardware features
•firmware revision history
•description
•new 6 catalog numbers
•application example
•specifications
page(s):
•1-1
•1-5
•1-6
•4-1
•4-1
•A-1
Programmer/HMI Port
•location
•configuration
•supported protocol
•no LED indicator provided
page(s):
•1-1
•4-2
•4-2
•C-1

Publication 1762-UM001D-EN-P - March 2004
Summary of Changes 2

iPublication 1762-UM001D-EN-P - March 2004
Table of Contents
Preface Who Should Use this Manual. . . . . . . . . . . . . . . . . . . . . . . P-1
Purpose of this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . P-1
Related Documentation . . . . . . . . . . . . . . . . . . . . . . . . P-2
Common Techniques Used in this Manual . . . . . . . . . . . . . P-2
Chapter 1
Hardware Overview
Hardware Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Component Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
MicroLogix 1200 Memory Module and/or Real-Time Clock .
1-2
1762 Expansion I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Communication Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Firmware Revision History . . . . . . . . . . . . . . . . . . . . . . 1-4
Communication Options . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Chapter 2
Installing Your Controller
Agency Certifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Compliance to European Union Directives . . . . . . . . . . . . . 2-1
EMC Directive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
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
Input States on Power Down . . . . . . . . . . . . . . . . . . . . 2-7
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
Installing a Memory Module and/or Real-Time Clock . . . . . 2-12
Controller Mounting Dimensions . . . . . . . . . . . . . . . . . . . . 2-13
Controller and
Expansion I/O Spacing . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13
Mounting the Controller . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14
DIN Rail Mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15
Panel Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16
1762 Expansion I/O Dimensions . . . . . . . . . . . . . . . . . . . . 2-17

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Table of Contents ii
Mounting 1762
Expansion I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17
DIN Rail Mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17
Panel Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18
Connecting Expansion I/O . . . . . . . . . . . . . . . . . . . . . . . . 2-19
Chapter 3
Wiring Your Controller
Wiring Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Wiring Recommendation . . . . . . . . . . . . . . . . . . . . . . . 3-1
Using Surge Suppressors . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Recommended Surge Suppressors . . . . . . . . . . . . . . . . 3-5
Grounding the Controller . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Terminal Block Layouts . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Terminal Groupings . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
Sinking and Sourcing Wiring Diagrams . . . . . . . . . . . . . . . 3-10
1762-L24AWA, 1762-L24BWA, 1762-L24BXB, 1762-L24AWAR,
1762-L24BWAR and 1762-L24BXBR Wiring Diagrams. . . 3-11
1762-L40AWA, 1762-L40BWA, 1762-L40BXB ,
1762-L40AWAR, 1762-L40BWAR and 1762-L40BXBR Wiring
Diagrams. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15
Controller I/O Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17
Minimizing Electrical Noise. . . . . . . . . . . . . . . . . . . . . . 3-17
Expansion I/O Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-17
Discrete Wiring Diagrams. . . . . . . . . . . . . . . . . . . . . . . 3-17
Analog Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-22
Chapter 4
Communication Connections
Supported Communication Protocols . . . . . . . . . . . . . . . . . 4-1
Default Communication Configuration . . . . . . . . . . . . . . . . 4-2
Using the Communications Toggle Push Button . . . . . . . . . 4-2
Connecting to the RS-232 Port . . . . . . . . . . . . . . . . . . . . . . 4-4
Making a DF1 Point-to-Point Connection . . . . . . . . . . . 4-5
Using a Modem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
Isolated Modem Connection. . . . . . . . . . . . . . . . . . . . . 4-6
Connecting to a DF1 Half-Duplex Network. . . . . . . . . . 4-8
Connecting to a DH-485 Network . . . . . . . . . . . . . . . . . . . 4-9
Recommended Tools . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9
DH-485 Communication Cable . . . . . . . . . . . . . . . . . . . 4-9
Connecting the Communication Cable to the DH-485
Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10
Grounding and Terminating the DH-485 Network . . . . . 4-12
Connecting the AIC+. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12
Cable Selection Guide . . . . . . . . . . . . . . . . . . . . . . . . . 4-14
Recommended User-Supplied Components. . . . . . . . . . 4-16

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Table of Contents iii
Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . 4-17
Installing and Attaching the AIC+ . . . . . . . . . . . . . . . . . 4-18
Powering the AIC+. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-18
DeviceNet Communications. . . . . . . . . . . . . . . . . . . . . . . . 4-20
Cable Selection Guide . . . . . . . . . . . . . . . . . . . . . . . . . 4-20
Chapter 5
Using Trim Pots
Trim Pot Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Trim Pot Information Function File . . . . . . . . . . . . . . . . 5-2
Error Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
Chapter 6
Using Real-Time Clock and
Memory Modules
Real-Time Clock Operation . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Removal/Insertion Under Power. . . . . . . . . . . . . . . . . . 6-1
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
Data File Download Protection. . . . . . . . . . . . . . . . . . . 6-4
Memory Module Write Protection . . . . . . . . . . . . . . . . . 6-4
Removal/Insertion Under Power. . . . . . . . . . . . . . . . . . 6-4
Appendix A
Specifications
Controller Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
Expansion I/O Specifications . . . . . . . . . . . . . . . . . . . . . . . A-6
Discrete I/O Modules. . . . . . . . . . . . . . . . . . . . . . . . . . A-6
Analog Modules. . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-12
Appendix B
Replacement Parts
MicroLogix 1200 Replacement Kits. . . . . . . . . . . . . . . . . . . B-1
Controller 40-Point Replacement Terminal Blocks . . . . . B-1
1762 Expansion I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-2
Expansion I/O Replacement Doors. . . . . . . . . . . . . . . . B-2
Expansion I/O Replacement DIN Latches . . . . . . . . . . . B-2
Expansion I/O Replacement Door Labels . . . . . . . . . . . B-2
Appendix C
Troubleshooting Your System
Understanding the Controller LED Status . . . . . . . . . . . . . . C-1
Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-2
Error Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-2
Controller Error Recovery Model . . . . . . . . . . . . . . . . . . . . C-3
Analog Expansion I/O Diagnostics and Troubleshooting. . . C-4
Module Operation and Channel Operation . . . . . . . . . . C-4

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Table of Contents iv
Power-up Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . C-4
Critical and Non-Critical Errors . . . . . . . . . . . . . . . . . . . C-5
Module Error Definition Table . . . . . . . . . . . . . . . . . . . C-5
Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-7
Calling Rockwell Automation for Assistance . . . . . . . . . . . . C-8
Appendix D
Using Control Flash to Upgrade
Your Operating System
Preparing for Upgrade. . . . . . . . . . . . . . . . . . . . . . . . . . . . D-1
Install ControlFlash Software . . . . . . . . . . . . . . . . . . . . D-1
Prepare the Controller for Updating . . . . . . . . . . . . . . . D-2
Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . D-2
Missing/Corrupt OS LED Pattern . . . . . . . . . . . . . . . . . . . . D-2
Appendix E
Connecting to Networks via
RS-232 Interface
RS-232 Communication Interface . . . . . . . . . . . . . . . . . . . . E-1
DF1 Full-Duplex Protocol . . . . . . . . . . . . . . . . . . . . . . . . . E-1
DF1 Half-Duplex Protocol . . . . . . . . . . . . . . . . . . . . . . . . . E-2
Using Modems with MicroLogix 1200 Programmable
Controllers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-3
DH-485 Communication Protocol. . . . . . . . . . . . . . . . . . . . E-5
Devices that use the DH-485 Network . . . . . . . . . . . . . E-5
Important DH-485 Network Planning Considerations. . . E-6
Example DH-485 Connections . . . . . . . . . . . . . . . . . . . E-9
Modbus Communication Protocol . . . . . . . . . . . . . . . . . . E-12
ASCII . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-12
Appendix F
System Loading and Heat
Dissipation
System Loading Limitations . . . . . . . . . . . . . . . . . . . . . . . . F-1
System Loading Example Calculations (24-Point Controller) .
F-1
System Loading Worksheet . . . . . . . . . . . . . . . . . . . . . . . . F-3
Current Loading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-4
System Loading Example Calculations (40-Point Controller) .
F-5
System Loading Worksheet . . . . . . . . . . . . . . . . . . . . . . . . F-7
Current Loading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-7
Calculating Heat Dissipation . . . . . . . . . . . . . . . . . . . . . . . F-9
Glossary
Index
Rockwell Automation Support . . . . . . . . . . . . . . . . . . . . . . 1-9
Installation Assistance . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
New Product Satisfaction Return. . . . . . . . . . . . . . . . . . 1-9

1Publication 1762-UM001D-EN-P - March 2004
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™ 1200 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 1200 controllers and
expansion I/O. 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 1200 controller system
Refer to Publication 1762-RM001, MicroLogix 1200 and 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 RSLogix 500
programming software user documentation for more information on
programming your MicroLogix 1200 controller.

Publication 1762-UM001D-EN-P - March 2004
P-2 Preface
Related Documentation
The following documents contain additional information concerning
Rockwell Automation products. To obtain a copy, contact your local
Rockwell Automation office or distributor.
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.
For Read this Document Document Number
Information on understanding and applying micro controllers. MicroMentor 1761-MMB
Information on the MicroLogix 1200 Controllers instruction set. MicroLogix 1200 and 1500
Programmable Controllers Instruction
Set Reference Manual
1762-RM001
Information on mounting and wiring the MicroLogix 1200
Controllers, including a mounting template for easy installation.
MicroLogix 1200 Programmable
Controllers Installation Instructions
1762-IN006
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 DF1 open protocol. DF1 Protocol and Command Set
Reference Manual
1770-6.5.16
Information about the Modbus protocol. Modbus Protocol Specifications Available from
www.modbus.org
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

1Publication 1762-UM001D-EN-P - March 2004
Chapter 1
Hardware Overview
Hardware Features
The Bulletin 1762, MicroLogix 1200 programmable controller contains
a power supply, input and output circuits, and a processor. The
controller is available in 24 I/O and 40 I/O configurations.
The hardware features of the controller are:
Table 1.1 Hardware Features
Feature Description Feature Description
1 Terminal Blocks
(Removable Terminal Blocks on 40-point controllers
only.)
7 Terminal Doors and Labels
2 Bus Connector Interface to Expansion I/O 8 Trim Pots
3 Input LEDs 9 Communications Toggle Push Button
4 Output LEDs 10 Memory Module Port Cover(1) -or-
Memory Module and/or Real-Time Clock(2)
5 Communication Port/
Channel 0
11 DIN Rail Latches
6 Status LEDs 12 Programmer/HMI Port
(Equipped with 1762-LxxxxxR controllers only)
(1) Shipped with controller.
(2) Optional equipment.
12
1
2
3
4
5
6
7
7
9
8
10
11
COM
0
1
Side View Top View

Publication 1762-UM001D-EN-P - March 2004
1-2 Hardware Overview
Component Descriptions MicroLogix 1200 Memory Module and/or Real-Time Clock
The controller is shipped with a memory module port cover in place.
You can order a memory module, real-time clock, or memory module
and real-time clock as an accessory.
Table 1.2 Controller Input Power and Embedded I/O
Catalog Number Description
Input Power Inputs Outputs
1762-L24AWA, -L24AWAR 120/240V ac (14) 120V ac (10) relay
1762-L24BWA, -L24BWAR 120/240V ac (10) 24V dc
(4) fast 24V dc
(10) relay
1762-L24BXB, -L24BXBR 24V dc (10) 24V dc
(4) fast 24V dc
(5) relay, (4) 24V dc FET
(1) high-speed 24V dc FET
1762-L40AWA, -L40AWAR 120/240V ac (24) 120V ac (16) relay
1762-L40BWA, -L40BWAR 120/240V ac (20) 24V dc
(4) fast 24V dc
(16) relay
1762-L40BXB, -L40BXBR 24V dc (20) 24V dc
(4) fast 24V dc
(8) relay, (7) 24V dc FET
(1) high-speed 24V dc FET
Table 1.3 Memory Module and/or Real-Time Clock
Catalog Number Descriptions
1762-MM1 Memory Module only
1762-RTC Real-Time Clock only
1762-MM1RTC Memory Module and Real-Time Clock

Publication 1762-UM001D-EN-P - March 2004
Hardware Overview 1-3
1762 Expansion I/O
1762 expansion I/O can be connected to the MicroLogix 1200
controller, as shown below.
TIP
zt
A maximum of six I/O modules, in certain
combinations, may be connected to a controller. See
Appendix F System Loading and Heat Dissipation to
determine valid combinations.
1762 Expansion I/O 1762 Expansion I/O Connected to MicroLogix 1200 Controller
Table 1.4 Expansion I/O
Catalog Number Descriptions
1762-IA8 8-Point 120V ac Input
1762-IQ8 8-Point Sink/Source 24V dc Input
1762-IQ16 16-Point Sink/Source 24V dc Input
1762-OA8 8-Point AC Triac Output
1762-OB8 8-Point Sourcing 24V dc Output
1762-OB16 16-Point Sourcing 24V dc Output
1762-OW8 8-Point AC/DC Relay Output
1762-OW16 16-Point AC/DC Relay Output
1762-OX6I 6-Point Isolated Relay Output
1762-IF2OF2 2-Channel Analog Voltage/Current Input
2-Channel Analog Voltage/Current Output
1762-IF4 4-Channel Analog Voltage/Current Input
1762-OF4 4-Channel Analog Voltage/Current Output
1762-IR4 RTD/Resistance Input
1762-IT4 Thermocouple/mV Input

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1-4 Hardware Overview
Communication Cables
Use only the following communication cables with the MicroLogix
1200 controllers.
•1761-CBL-PM02 Series C or later
•1761-CBL-HM02 Series C or later
•1761-CBL-AM00 Series C or later
•1761-CBL-AP00 Series C or later
•2707-NC8 Series A or later
•2702-NC9 Series B or later
•2707-NC10 Series B or later
•2707-NC11 Series B or later
Programming
Programming the MicroLogix 1200 programmable controller is done
using RSLogix™ 500, Revision 4 or later. You must use Revision 4.5 or
later of RSLogix™ 500 in order to use the new features of the Series B
MicroLogix 1200 controllers, including the full ASCII instruction set.
Communication cables for programming are not included with the
software.
Firmware Revision History
Features are added to the controllers through firmware upgrades. Use
the listing below to be sure that your controller’s firmware is at the
level you need. Firmware upgrades are not required, except to allow
you access to the new features.
MicroLogix 1200
Catalog
Number OS(1)
Series
Letter
OS
Revision
Letter
OS
Firmware
Release No.
Release Date Enhancement
1762-L24AWA
1762-L24BWA
1762-L40AWA
1762-L40BWA
A A FRN1 March 2000 Initial product release.
A B FRN2 May 2000 The trim pots (trimming potentiometers) on the controller
operated in reverse of the ladder logic. Corrected.
B A FRN3 November 2000 MicroLogix 1200 controllers now offer:
•Full ASCII (read/write)
•PTO Controlled Stop
•PWM Ramping
•RTC and String Messaging
•Static Data File Protection
•Comms Reset Pushbutton Bit
1762-L24BXB
1762-L40BXB
B A FRN3 November 2000 Initial product release. Supports all the features listed above for
the 1762-L24xWA and 1762-L40xWA controllers.

Publication 1762-UM001D-EN-P - March 2004
Hardware Overview 1-5
1762-L24AWA
1762-L24BWA
1762-L24BXB
1762-L40AWA
1762-L40BWA
1762-L40BXB
CA FRN4(2) June 2001 MicroLogix 1200 controllers now offer:
•Floating Point (F) Data File for use with:
compare instructions (EQU, GEQ, GRT, LEQ, LES, LIM, NEQ);
math instructions (ABS, ADD, CLR, DIV, MUL, NEG, SQR,
SUB); move instruction (MOV); file instructions (CPW, FLL);
and the message (MSG) instruction
•Programmable Limit Switch (PLS) File for use with HSC
•RTA - Real Time Clock Adjust
•GCD - Gray Code
•CPW - Copy Word
•ABS - Absolute Value
CB FRN5(3) March 2002 Internal firmware revision; no user functionality change.
CC FRN6(3) September 2002 MicroLogix 1200 Controllers now offer:
•The Floating Point (F) Data File can now be used with the
Scale with Parameters (SCP)
•Modbus Memory Mapping Enhancements
1762-L24AWA
1762-L24BWA
1762-L24BXB
1762-L40AWA
1762-L40BWA
1762-L40BXB
C D FRN7 April 2003 MicroLogix 1200 Controllers now offer:
•DF1 Half-Duplex Master Driver
•DF1 Radio Modem Driver
•Enhanced DF1 Broadcast Support
•ASCII Clear Buffer (ACL) instruction enhancement
C E FRN8 November 2003 MicroLogix 1200 Controllers now offer:
•Modbus Master Protocol
•PTO Independent Accel/Decel profiles
1762-L24AWAR
1762-L24BWAR
1762-L24BXBR
1762-L40AWAR
1762-L40BWAR
1762-L40BXBR
C E FRN8 March 2004 MicroLogix 1200 Controllers now offer:
•Additional communications port called the Programmer/HMI
Port
There are operating system firmware flash upgrades and downgrades available for MicroLogix 1200 controllers from the MicroLogix
website (www.ab.com/micrologix). Any controller may be upgraded to the latest release by using these tools. Issues regarding
downgrading are discussed below.
(1) OS = Operating System.
(2) For users of RSLogix 500 Programming Software version 4.5 - MicroLogix 1200 Series C Revision A controllers with FRN4 firmware may be downgraded for compatibility
with this version of software using the ControlFlash FRN3 tool available on the MicroLogix website. Your controller may be later upgraded using the FRN5 (which replaces
the FRN4 ControlFlash upgrade, and is a functional equivalent) or higher ControlFlash tool.
(3) For users of RSLogix 500 Programming Software version 4.5 - MicroLogix 1200 Series C Revision B controllers with FRN5 or later firmware may be downgraded for
compatibility with this version of software using the ControlFlash FRN 3.1 tool available on the MicroLogix website. Your controller may be later upgraded using the FRN5
(which replaces the FRN 4 ControlFlash upgrade, and is a functional equivalent) or higher ControlFlash tool.
MicroLogix 1200
Catalog
Number OS(1)
Series
Letter
OS
Revision
Letter
OS
Firmware
Release No.
Release Date Enhancement

Publication 1762-UM001D-EN-P - March 2004
1-6 Hardware Overview
Communication Options
The MicroLogix 1200 can be connected to a personal computer. It can
also be connected to a DH-485 network, or a Modbus™ network as an
RTU Master or RTU Slave using an Advanced Interface Converter
(catalog number 1761-NET-AIC) and to the DeviceNet™ network
using a DeviceNet Interface (catalog number 1761-NET-DNI). The
controller can also be connected to DF1 Half Duplex networks as an
RTU Master or RTU Slave. Series B controllers may also be connected
to serial devices using ASCII. See Chapter 4 Communication
Connections for more information on connecting to the available
communication options.
The 1762-LxxxxxR controllers provide an additional communication
port called the Programmer/HMI Port. This port supports DF1 Full
Duplex protocol only. The controller cannot initiate messages through
this port. It can only respond to messages sent to it. All
communication parameters are fixed and cannot be changed by a
user. See Default Communication Configuration on page 4-2 for the
configuration settings.

1Publication 1762-UM001D-EN-P - March 2004
Chapter 2
Installing Your Controller
This chapter shows you how to install your controller. The only tools
you require are a flat or Phillips head screwdriver and drill. Topics
include:
•agency certifications
•compliance to European Union Directives
•installation considerations
•safety considerations
•power considerations
•preventing excessive heat
•master control relay
•installing the memory module and/or real-time clock
•controller mounting dimensions
•controller and expansion I/O spacing
•mounting the controller
•mounting 1762 expansion I/O
•connecting 1762 expansion I/O
Agency Certifications
•UL 508
•C-UL under CSA C22.2 no. 142
•Class I, Division 2, Groups A, B, C, D
(UL 1604, C-UL under CSA C22.2 no. 213)
•CE compliant for all applicable directives
•C-Tick compliant for all applicable acts.
Compliance to European
Union Directives
This product has the CE mark and is approved for installation within
the European Union and EEA regions. It has been designed and tested
to meet the following directives.

Publication 1762-UM001D-EN-P - March 2004
2-2 Installing Your Controller
EMC Directive
This product is tested to meet Council Directive 89/336/EEC
Electromagnetic Compatibility (EMC) and the following standards, in
whole or in part, documented in a technical construction file:
•EN 50081-2
EMC - Generic Emission Standard, Part 2 - Industrial
Environment
•EN 50082-2
EMC - Generic Immunity Standard, Part 2 - Industrial
Environment
This product is intended for use in an industrial environment.
Low Voltage Directive
This product is tested to meet Council Directive 73/23/EEC Low
Voltage, by applying the safety requirements of EN 61131-2
Programmable Controllers, Part 2 - Equipment Requirements and
Tests.
For specific information required by EN 61131-2, see the appropriate
sections in this publication, as well as the following Allen-Bradley
publications:
•Industrial Automation Wiring and Grounding Guidelines for
Noise Immunity, publication 1770-4.1
•Guidelines for Handling Lithium Batteries, publication AG-5.4
•Automation Systems Catalog, publication B113
Installation Considerations
Most applications require installation in an industrial enclosure
(Pollution Degree 2(1)) to reduce the effects of electrical interference
(Over Voltage Category II(2)) and environmental exposure. Locate
your controller as far as possible from power lines, load lines, and
other sources of electrical noise such as hard-contact switches, relays,
and AC motor drives. For more information on proper grounding
guidelines, see the Industrial Automation Wiring and Grounding
Guidelines publication 1770-4.1.
(1) Pollution Degree 2 is an environment where normally only non-conductive pollution occurs except that
occasionally temporary conductivity caused by condensation shall be expected.
(2) Overvoltage Category II is the load level section of the electrical distribution system. At this level, transient
voltages are controlled and do not exceed the impulse voltage capability of the products insulation.

Publication 1762-UM001D-EN-P - March 2004
Installing Your Controller 2-3
Safety Considerations
Safety considerations are an important element of proper system
installation. Actively thinking about the safety of yourself and others,
as well as the condition of your equipment, is of primary importance.
We recommend reviewing the following safety considerations.
Hazardous Location Considerations
This equipment is suitable for use in Class I, Division 2, Groups A, B,
C, D or non-hazardous locations only. The following WARNING
statement applies to use in hazardous locations.
ATTENTION Vertical mounting of the controller is not
recommended due to heat build-up considerations.
ATTENTION Be careful of metal chips when drilling mounting
holes for your controller or other equipment within
the enclosure or panel. Drilled fragments that fall
into the controller or I/O modules could cause
damage. Do not drill holes above a mounted
controller if the protective debris shields are
removed or the processor is installed.
WARNING EXPLOSION HAZARD
•Substitution of components may impair suitability
for Class I, Division 2.
•Do not replace components or disconnect
equipment unless power has been switched off.
•Do not connect or disconnect components unless
power has been switched off.
•This product must be installed in an enclosure.
All cables connected to the product must remain
in the enclosure or be protected by conduit or
other means.
•All wiring must comply with N.E.C. article
501-4(b).

Publication 1762-UM001D-EN-P - March 2004
2-4 Installing Your Controller
Use only the following communication cables in Class I, Division 2
hazardous locations.
Disconnecting Main Power
The main power disconnect switch should be located where operators
and maintenance personnel have quick and easy access to it. In
addition to disconnecting electrical power, all other sources of power
(pneumatic and hydraulic) should be de-energized before working on
a machine or process controlled by a controller.
Safety Circuits
Circuits installed on the machine for safety reasons, like overtravel
limit switches, stop push buttons, and interlocks, should always be
hard-wired directly to the master control relay. These devices must be
wired in series so that when any one device opens, the master control
relay is de-energized, thereby removing power to the machine. Never
alter these circuits to defeat their function. Serious injury or machine
damage could result.
Communication Cables for Class I, Division 2 Hazardous Locations
1761-CBL-PM02 Series C or later
1761-CBL-HM02 Series C or later
1761-CBL-AM00 Series C or later
1761-CBL-AP00 Series C or later
2707-NC8 Series A or later
2707-NC9 Series B or later
2707-NC10 Series B or later
2707-NC11 Series B or later
WARNING Explosion Hazard
Do not replace components or disconnect equipment
unless power has been switched off.
WARNING Explosion Hazard
Do not connect or disconnect connectors while
circuit is live.