Allen-Bradley MicroLogix 1200 User manual

MicroLogix™ 1200
andMicroLogix1500
Programmable
Controllers
(Bulletins 1762 and 1764)
Instruction Set
Reference 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, Rockwell International Corporation does not assume
responsibility or liability (to include intellectual property liability) for
actual use based upon the examples shown in this publication.
Rockwell Automation publication SGI-1.1, Safety Guidelines for the
Application, Installation and Maintenance of Solid-State Control
(available from your local Rockwell Automation 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 manual we use notes to make you aware of safety
considerations:
Attention statements help you to:
•identify a hazard
•avoid a hazard
•recognize the consequences
PLC-5 is a registered trademark; and MicroLogix, SLC 500, RSLogix, and RSLinx are trademarks of Rockwell Automation.
Modbus is a trademark of Schneider Electric Incorporated.
DeviceNet is a trademark of Open DeviceNet Vendor Association (ODVA).
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.

3Publication 1762-RM001C-EN-P - November 2000
Summary of Changes
The information below summarizes the changes to this manual since
the last printing as publication 1762-RM001B-US-P, April 2000.
To help you locate new and updated information in this release of the
manual, we have included change bars as shown to the right of this
paragraph.
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 Series Letter Revision Letter Firmware Release No. Release Date Enhancement
1762-L24AWA
1762-L24BWA
1762-L40AWA
1762-L40BWA
A A FRN1 March 2000 Initial product release.
1762-L24AWA
1762-L24BWA
1762-L40AWA
1762-L40BWA
A B FRN2 May 2000 The trim pots (trimming potentiometers) on the controller
operated in reverse of the ladder logic. Corrected.
1762-L24AWA
1762-L24BWA
1762-L40AWA
1762-L40BWA
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-RM001C-EN-P - November 2000
Summary of Changes 4
MicroLogix 1500
Catalog
Number Series Letter Revision Letter Firmware Release No. Release Date Enhancement
1764-LSP A B FRN2 February 1999 Initial product release.
1764-LSP A C FRN3 October 1999 MicroLogix 1500 Controllers with 1764-LSP Processor can now
be used with Compact I/O (Bulletin 1769) Expansion Cables and
Power Supplies.
1764-LSP B A FRN4 April 2000 MicroLogix 1500 Controllers with 1764-LSP Processor can now
use:
•String Data File Type
•ASCII Instruction Set Support
•Modbus RTU Slave protocol
•Ramping, when using PWM outputs
•Static Data File Protection
•RTC Messaging
1764-LRP B A FRN4 April 2000 Initial product release. MicroLogix 1500 Controllers with
1764-LRP Processor has all the features of the 1764-LSP, plus:
•Second communications port (isolated RS-232)
•Data Logging capability
1764-LSP B B FRN5 October 2000 For both the 1764-LSP and LRP processors:
•When using the PTO feature, the controller can now
perform a controlled stop when using PTO outputs. The
deceleration phase of the PTO can be initiated early via
ladder logic.
•Enhanced program compare bitfunctionality in the Memory
Module.
1764-LRP B B FRN5 October 2000

Publication 1762-RM001C-EN-P - November 2000
Summary of Changes 5
New Information
The table below lists sections that document new features and
additional information about existing features.
For This New Information See
Added MicroLogix 1200 1762-L24BXB and 1762-L40BXB Controllers Chapter 1, 5, 6
Added configuration information for several new I/O modules:
•1762-IQ16, -OA8, -OB8, -OB16, -OW16, -IF4
•1769-OB16P and -IT6
Chapter 1
Added section on Configuring Expansion I/O Using RSLogix 500 Chapter 1
Made minor changes to clarify data file numbering. Chapter 2
Modified section on Writing Data to the Real-Time Clock Chapter 3
In the Communications Status File, General Channel Status Block, Bit 15,
the Comms Toggle Push Button Bit, is now valid for MicroLogix 1200 and
MicroLogix 1500 (previously was only the MicroLogix 1500).
Chapter 3
Added IMPORTANT notes about using the High-Speed Counter (HSC). Chapter 5
Added IMPORTANT notes about using the High-Speed Outputs (PTO and
PWM). Chapter 6
Modified text that describes the PWM Accel/Decel Delay (ADD)
parameter. Chapter 6
Added PTO Controlled Stop (CS) parameter (MicroLogix 1500 only). Chapter 6
Modified text that describes the Scale (SCL) instruction. Chapter 10
Corrected text for the PID Reset Term (Ti). The last sentence now reads:
“A value of 1 adds the maximum integral term into the PID equation.”
(previously said that “a value of 1 adds theminimum integral term...”)
Chapter 19
MicroLogix 1200 Series B Controllers can use the entire set of ASCII
instructions Chapter 20
Added section on Programming ASCII Instructions with information on
how to prevent communications shut-down when using ASCII
instructions.
Chapter 20
Added Ctrl-characters to the ASCII Character Set chart. Chapter 20
Added MSG File Element description. Chapter 21
The ASCII String Manipulation Error bit (S:5/15) now applies to
MicroLogix 1200 Series B Controllers as well as the MicroLogix 1500. Appendix C
Added Fault Classification (non-user, recoverable, non-recoverable) to the
Fault Messages troubleshooting table. Appendix D
Added new Error Code:
001A - User Program Incompatible with OS at Power-Up Appendix D
Added alphabetical list of instructions for easy reference. Inside Back
Cover
ASCII Protocol can be used by MicroLogix 1200 Series B Controllers as
well as the MicroLogix 1500. Appendix E
Updated Instruction ExecutionTimes Appendix A
and B, and
throughout
manual

Publication 1762-RM001C-EN-P - November 2000
Summary of Changes 6

iPublication 1762-RM001C-EN-P
Table of Contents
Preface Who Should Use this Manual . . . . . . . . . . . . . . . . . . . . . . . . P-1
Purpose of this Manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . P-1
Common Techniques Used in this Manual. . . . . . . . . . . . . . . P-2
Rockwell Automation Support . . . . . . . . . . . . . . . . . . . . . . . P-3
Chapter 1
I/O Configuration Embedded I/O. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
MicroLogix 1200 Expansion I/O . . . . . . . . . . . . . . . . . . . . . . 1-3
MicroLogix 1200 Expansion I/O Memory Mapping. . . . . . . . . 1-4
MicroLogix 1500 Compact™Expansion I/O. . . . . . . . . . . . . . 1-7
MicroLogix 1500 Compact™Expansion I/O Memory Mapping 1-9
I/O Addressing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
I/O Forcing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14
Input Filtering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14
Latching Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15
Configuring Expansion I/O Using RSLogix 500 . . . . . . . . . . 1-18
Chapter 2
Controller Memory and File
Types Controller Memory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 Data Files. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Protecting Data Files During Download. . . . . . . . . . . . . . . . . 2-6
Static File Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Password Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Clearing the Controller Memory . . . . . . . . . . . . . . . . . . . . . 2-10
Allow Future Access Setting (OEM Lock). . . . . . . . . . . . . . . 2-10
Chapter 3
Function Files Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Real-Time Clock Function File . . . . . . . . . . . . . . . . . . . . . . . 3-3
Trim Pot Information Function File . . . . . . . . . . . . . . . . . . . . 3-5
Memory Module Information Function File . . . . . . . . . . . . . . 3-6
DAT Function File (MicroLogix 1500 only) . . . . . . . . . . . . . . 3-9
Base Hardware Information Function File . . . . . . . . . . . . . . 3-12
Communications Status File . . . . . . . . . . . . . . . . . . . . . . . . 3-13
Input/Output Status File . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18
Chapter 4
Programming Instructions
Overview Instruction Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 Using the Instruction Descriptions. . . . . . . . . . . . . . . . . . . . . 4-2

Publication 1762-RM001C-EN-P
Table of Contents ii
Chapter 5
Using the High-Speed
Counter High-Speed Counter (HSC) Function File . . . . . . . . . . . . . . . 5-2 High-Speed Counter Function File Sub-Elements Summary . . 5-4
HSC Function File Sub-Elements. . . . . . . . . . . . . . . . . . . . . . 5-5
HSL - High-Speed Counter Load . . . . . . . . . . . . . . . . . . . . . 5-26
RAC - Reset Accumulated Value . . . . . . . . . . . . . . . . . . . . . 5-27
Chapter 6
Using High-Speed Outputs PTO - Pulse Train Output. . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Pulse Train Output Function. . . . . . . . . . . . . . . . . . . . . . . . . 6-2
Pulse Train Outputs (PTO) Function File. . . . . . . . . . . . . . . . 6-6
Pulse Train Output Function File Sub-Elements Summary . . . 6-7
PWM - Pulse Width Modulation . . . . . . . . . . . . . . . . . . . . . 6-18
PWM Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-18
Pulse Width Modulation (PWM) Function File . . . . . . . . . . . 6-19
Pulse Width Modulated Function File Elements Summary . . 6-20
Chapter 7
Relay-Type (Bit) Instructions XIC - Examine if Closed
XIO - Examine if Open . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
OTE - Output Energize. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3
OTL - Output Latch, OTU - Output Unlatch . . . . . . . . . . . . . 7-4
ONS - One Shot. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-5
OSR - One Shot Rising, OSF - One Shot Falling. . . . . . . . . . . 7-6
Chapter 8
Timer and Counter
Instructions Timer Instructions Overview . . . . . . . . . . . . . . . . . . . . . . . . 8-1 TON - Timer, On-Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4
TOF - Timer, Off-Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-5
RTO - Retentive Timer, On-Delay . . . . . . . . . . . . . . . . . . . . . 8-6
How Counters Work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-7
CTU - Count Up, CTD - Count Down . . . . . . . . . . . . . . . . . . 8-9
RES - Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-10
Chapter 9
Compare Instructions Using the Compare Instructions . . . . . . . . . . . . . . . . . . . . . . 9-2
EQU - Equal, NEQ - Not Equal . . . . . . . . . . . . . . . . . . . . . . . 9-3
GRT - Greater Than, LES - Less Than . . . . . . . . . . . . . . . . . . 9-4
GEQ - Greater Than or Equal To, LEQ - Less Than or Equal To 9-5
MEQ - Mask Compare for Equal . . . . . . . . . . . . . . . . . . . . . . 9-6
LIM - Limit Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-7

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Chapter 10
Math Instructions Using the Math Instructions . . . . . . . . . . . . . . . . . . . . . . . . 10-2
Updates to Math Status Bits . . . . . . . . . . . . . . . . . . . . . . . . 10-3
ADD - Add, SUB - Subtract . . . . . . . . . . . . . . . . . . . . . . . . . 10-4
MUL - Multiply, DIV - Divide . . . . . . . . . . . . . . . . . . . . . . . 10-5
NEG - Negate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-6
CLR - Clear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-6
SCL - Scale. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-7
SCP - Scale with Parameters . . . . . . . . . . . . . . . . . . . . . . . . 10-8
SQR - Square Root . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-9
SWP - Swap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-10
Chapter 11
Conversion Instructions Using Decode and Encode Instructions . . . . . . . . . . . . . . . . 11-1
DCD - Decode 4 to 1-of-16. . . . . . . . . . . . . . . . . . . . . . . . . 11-2
ENC - Encode 1-of-16 to 4 . . . . . . . . . . . . . . . . . . . . . . . . . 11-3
FRD - Convert from Binary Coded Decimal (BCD). . . . . . . . 11-4
TOD - Convert to Binary Coded Decimal (BCD) . . . . . . . . . 11-8
Chapter 12
Logical Instructions Using Logical Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . 12-1
Updates to Math Status Bits . . . . . . . . . . . . . . . . . . . . . . . . 12-2
AND - Bit-Wise AND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-3
OR - Logical OR. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-4
XOR - Exclusive OR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-5
NOT - Logical NOT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-6
Chapter 13
Move Instructions MOV - Move . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-1
MVM - Masked Move . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-3
Chapter 14
File Instructions COP - Copy File. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14-2
FLL - Fill File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14-3
BSL - Bit Shift Left . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14-4
BSR - Bit Shift Right . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14-6
FFL - First In, First Out (FIFO) Load . . . . . . . . . . . . . . . . . . 14-8
FFU - First In, First Out (FIFO) Unload . . . . . . . . . . . . . . . 14-11
LFL - Last In, First Out (LIFO) Load. . . . . . . . . . . . . . . . . . 14-14
LFU - Last In, First Out (LIFO) Unload. . . . . . . . . . . . . . . . 14-17

Publication 1762-RM001C-EN-P
Table of Contents iv
Chapter 15
Sequencer Instructions SQC- Sequencer Compare . . . . . . . . . . . . . . . . . . . . . . . . . 15-2
SQO- Sequencer Output. . . . . . . . . . . . . . . . . . . . . . . . . . . 15-5
SQL - Sequencer Load . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15-8
Chapter 16
Program Control Instructions JMP - Jump to Label. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16-1
LBL - Label . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16-2
JSR - Jump to Subroutine . . . . . . . . . . . . . . . . . . . . . . . . . . 16-2
SBR - Subroutine Label. . . . . . . . . . . . . . . . . . . . . . . . . . . . 16-3
RET - Return from Subroutine. . . . . . . . . . . . . . . . . . . . . . . 16-3
SUS - Suspend . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16-4
TND - Temporary End . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16-4
END - Program End . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16-5
MCR - Master Control Reset . . . . . . . . . . . . . . . . . . . . . . . . 16-5
Chapter 17
Input and Output Instructions IIM - Immediate Input with Mask . . . . . . . . . . . . . . . . . . . . 17-1
IOM - Immediate Output with Mask . . . . . . . . . . . . . . . . . . 17-3
REF- I/O Refresh . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17-4
Chapter 18
Using Interrupts Information About Using Interrupts . . . . . . . . . . . . . . . . . . 18-2
User Interrupt Instructions . . . . . . . . . . . . . . . . . . . . . . . . . 18-7
INT - Interrupt Subroutine . . . . . . . . . . . . . . . . . . . . . . . . . 18-7
STS - Selectable Timed Start . . . . . . . . . . . . . . . . . . . . . . . . 18-8
UID - User Interrupt Disable. . . . . . . . . . . . . . . . . . . . . . . . 18-9
UIE - User Interrupt Enable . . . . . . . . . . . . . . . . . . . . . . . 18-10
UIF - User Interrupt Flush . . . . . . . . . . . . . . . . . . . . . . . . 18-11
Using the Selectable Timed Interrupt (STI) Function File . . 18-12
Using the Event Input Interrupt (EII) Function File . . . . . . 18-17
Chapter 19
Process Control Instruction The PID Concept . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19-1
The PID Equation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19-2
PD Data File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19-2
PID - Proportional Integral Derivative . . . . . . . . . . . . . . . . . 19-3
Input Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19-4
Output Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19-7
Tuning Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19-8
Runtime Errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19-16
Analog I/O Scaling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19-17
Application Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19-18
Application Examples. . . . . . . . . . . . . . . . . . . . . . . . . . . . 19-22

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Chapter 20
ASCII Instructions General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-1
ASCII Instructions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-1
Instruction Types and Operation. . . . . . . . . . . . . . . . . . . . . 20-2
Protocol Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-4
String (ST) Data File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-5
Control Data File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-6
ACL - ASCII Clear Buffers . . . . . . . . . . . . . . . . . . . . . . . . . . 20-7
AIC - ASCII Integer to String . . . . . . . . . . . . . . . . . . . . . . . . 20-8
AWA - ASCII Write with Append. . . . . . . . . . . . . . . . . . . . . 20-9
AWT - ASCII Write . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-11
ABL - Test Buffer for Line. . . . . . . . . . . . . . . . . . . . . . . . . 20-14
ACB - Number of Characters in Buffer. . . . . . . . . . . . . . . . 20-15
ACI - String to Integer . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-16
ACN - String Concatenate . . . . . . . . . . . . . . . . . . . . . . . . . 20-18
AEX - String Extract . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-19
AHL - ASCII Handshake Lines. . . . . . . . . . . . . . . . . . . . . . 20-20
ARD - ASCII Read Characters . . . . . . . . . . . . . . . . . . . . . . 20-22
ARL - ASCII Read Line . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-23
ASC - String Search. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-25
ASR - ASCII String Compare . . . . . . . . . . . . . . . . . . . . . . . 20-26
Timing Diagram for ARD, ARL, AWA, and AWT Instructions 20-28
Using In-line Indirection. . . . . . . . . . . . . . . . . . . . . . . . . . 20-29
ASCII Instruction Error Codes . . . . . . . . . . . . . . . . . . . . . . 20-30
ASCII Character Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20-31
Chapter 21
Communications Instructions Messaging Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21-1
MSG - Message . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21-3
The Message File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21-4
Local Messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21-7
Configuring a Local Message. . . . . . . . . . . . . . . . . . . . . . . . 21-9
Remote Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21-16
Configuring a Remote Message . . . . . . . . . . . . . . . . . . . . . 21-18
MSG Instruction Error Codes. . . . . . . . . . . . . . . . . . . . . . . 21-21
Timing Diagram for the MSG Instruction . . . . . . . . . . . . . . 21-23
SVC - Service Communications . . . . . . . . . . . . . . . . . . . . . 21-26
MSG Instruction Ladder Logic . . . . . . . . . . . . . . . . . . . . . . 21-28
Local Messaging Examples . . . . . . . . . . . . . . . . . . . . . . . . 21-29

Publication 1762-RM001C-EN-P
Table of Contents vi
Chapter 22
Data Logging
(MicroLogix 1500 1764-LRP
Processor only)
Queues and Records . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22-2
Configuring Data Log Queues . . . . . . . . . . . . . . . . . . . . . . 22-6
DLG - Data Log Instruction. . . . . . . . . . . . . . . . . . . . . . . . . 22-8
Data Log Status File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22-9
Retrieving (Reading) Records . . . . . . . . . . . . . . . . . . . . . . 22-11
Accessing the Retrieval File . . . . . . . . . . . . . . . . . . . . . . . 22-11
Conditions that Will Erase the Data Retrieval File . . . . . . . 22-13
Appendix A
MicroLogix 1200 Memory
Usage and Instruction
Execution Time
Programming Instructions Memory Usage and Execution Time A-1
MicroLogix 1200 Scan Time Worksheet. . . . . . . . . . . . . . . . . A-7
Appendix B
MicroLogix 1500 Memory
Usage and Instruction
Execution Time
Programming Instructions Memory usage and Execution Time B-1
MicroLogix 1500 Scan Time Worksheet. . . . . . . . . . . . . . . . . B-6
Appendix C
System Status File Status File Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-2
Status File Details. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-3
Appendix D
Fault Messages and Error
Codes Identifying Controller Faults . . . . . . . . . . . . . . . . . . . . . . . . . D-1 Contacting Rockwell Automation for Assistance. . . . . . . . . . . D-9
Appendix E
Protocol Configuration DH-485 Communication Protocol . . . . . . . . . . . . . . . . . . . . . E-2
DF1 Full-Duplex Protocol. . . . . . . . . . . . . . . . . . . . . . . . . . . E-5
DF1 Half-Duplex Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . E-6
Modbus™RTU Slave Protocol . . . . . . . . . . . . . . . . . . . . . . . E-9
ASCII Driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-13
Glossary
Index
MicroLogix 1200 and 1500 Alphabetical List of Instructions

1Publication1762-RM001C-EN-P
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 or 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 1200 and MicroLogix
1500 controllers. It describes the procedures you use to program and
troubleshoot your controller. This manual:
•gives you an overview of the file types used by the controllers
•provides the instruction set for the controllers
•contains application examples to show the instruction set in use

Publication 1762-RM001C-EN-P
Preface 2
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.
•Change bars appear beside information that has been changed or
added since the last revision of this manual. Change bars appear in
the margin as shown to the right of this paragraph.
For Read this Document Document Number
Information on understanding and applying micro controllers. MicroMentor 1761-MMB
Information on mounting and wiring the MicroLogix 1200 Programmable
Controller, including a mounting template and door labels. MicroLogix 1200 Programmable Controllers Installation Instructions 1762-IN006C-MU-P
Detailed information on planning, mounting, wiring, and troubleshooting
your MicroLogix 1200 system. MicroLogix 1200 Programmable Controllers User Manual 1762-UM001B-EN-P
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-IN001A-ML-P
Detailed information on planning, mounting, wiring, and troubleshooting
your MicroLogix 1500 system. MicroLogix 1500 Programmable Controllers User Manual 1764-UM001A-US-P
A description on how to install and connect an AIC+. This manual also
contains information on network wiring. AdvancedInterface 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
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 1762-RM001C-EN-P
Preface 3
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
If you need to contact Rockwell Automation for technical assistance,
please review the Fault Messages and Error Codes on page D-1 and the
Troubleshooting appendix in your controller’s User Manual first. Then call
your local Rockwell Automation representative. Rockwell Automation
phone numbers appear on the back of this manual.
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
Control and Information Group
Technical Communication, Dept. A602V
P.O. Box 2086
Milwaukee, WI 53201-2086
or visit our internet page at:
http://www.ab.com/micrologix or http://www.rockwellautomation.com

Publication 1762-RM001C-EN-P
Preface 4

1Publication 1762-RM001C-EN-P
Chapter 1
I/O Configuration
This section discusses the various aspects of Input and Output features of
the MicroLogix 1200 and MicroLogix 1500 controllers. Each controller
comes with a certain amount of embedded I/O, which is physically located
on the controller. The controller also allows for adding expansion I/O.
This section discusses the following I/O functions:
•Embedded I/O on page 1-1
•MicroLogix 1200 Expansion I/O on page 1-3
•MicroLogix 1200 Expansion I/O Memory Mapping on page 1-4
•MicroLogix 1500 Compact™Expansion I/O on page 1-7
•MicroLogix 1500 Compact™Expansion I/O Memory Mapping on
page 1-9
•I/O Addressing on page 1-13
•I/O Forcing on page 1-14
•Input Filtering on page 1-14
•Latching Inputs on page 1-15
Embedded I/O
The MicroLogix 1200 and 1500 provide discrete I/O that is built into the
controller as listed in the following table. These I/O points are referred to as
Embedded I/O.
Controller Family Inputs Outputs
Quantity Type Quantity Type
MicroLogix 1200
Controllers 1762-L24BWA 14 24V dc 10 relay
1762-L24AWA 14 120V ac 10 relay
1762-L24BXB 14 24V dc 10 5 relay
5 FET
1762-L40BWA 24 24V dc 16 relay
1762-L40AWA 24 120V ac 16 relay
1762-L40BXB 24 24V dc 16 8 relay
8 FET
MicroLogix 1500
Base Units 1764-24BWA 12 24V dc 12 relay
1764-24AWA 12 120V ac 12 relay
1764-28BXB 16 24V dc 12 6 relay
6 FET

Publication 1762-RM001C-EN-P
1-2 I/O Configuration
AC embedded inputs have fixed input filters. DC embedded inputs have
configurable input filters for a number of special functions that can be
used in your application. These are: high-speed counting, event
interrupts, and latching inputs. The 1764-28BXB has two high-speed
outputs for use as pulse train output (PTO) and/or pulse width
modulation (PWM) outputs. The 1762-L24BXB and -L40BXB each have
one high-speed output.

Publication 1762-RM001C-EN-P
I/O Configuration 1-3
MicroLogix 1200
Expansion I/O
If the application requires more I/O than the controller provides, you can
attach I/O modules. These additional modules are called expansion I/O.
Expansion I/O Modules
MicroLogix 1200 expansion I/O (Bulletin 1762) is used to provide discrete
and analog inputs and outputs and, in the future, specialty modules. For
the MicroLogix 1200, you can attach up to six additional I/O modules.
The number of 1762 I/O modules that can be attached to the MicroLogix
1200 is dependent on the amount of power required by the I/O modules.
See your MicroLogix 1200 User Manual, publication 1762-UM001A-US-P
for more information on valid configurations.
Addressing Expansion I/O Slots
The figure below shows the addressing for the MicroLogix 1200 and its
I/O.
The expansion I/O is addressed as slots 1 through 6 (the controller’s
embedded I/O is addressed as slot 0). Modules are counted from left to
right as shown below.
NOTE Visit the MicroLogix web site (http://www.ab.com/
micrologix.) for the MicroLogix 1200 Expansion I/O
System Qualifier.
NOTE In most cases, you can use the following address format:
X:s/b (X = file type letter, s = slot number, b = bit number)
See I/O Addressing on page 1-13 for complete
information on address formats.
Expansion I/O
Embedded I/O = Slot 0
Slot 1 Slot 2

Publication 1762-RM001C-EN-P
1-4 I/O Configuration
MicroLogix 1200
Expansion I/O Memory
Mapping
Discrete I/O Configuration
1762-IA8 and 1762-IQ8 Input Image
For each input module, the input data file contains the current state of the
field input points. Bit positions 0 through 7 correspond to input terminals
0 through 7.
r = read only, x = not used, always at a 0 or OFF state
1762-IQ16 Input Image
For each input module, the input data file contains the current state of the
field input points. Bit positions 0 through 15 correspond to input
terminals 0 through 15.
r = read only
1762-OA8, 1762-OB8, and 1762-OW8 Output Image
For each output module, the output data file contains the
controller-directed state of the discrete output points. Bit positions 0
through 7 correspond to output terminals 0 through 7.
r/w = read and write, 0 = always at a 0 or OFF state
1762-OB16 and 1762-OW16 Output Image
For each output module, the output data file contains the
controller-directed state of the discrete output points. Bit positions 0
through 15 correspond to output terminals 0 through 15.
r/w = read and write
Word
Bit Position
1514131211109876543210
0xxxxxxxxrrrrrrrr
Word
Bit Position
1514131211109876543210
0rrrrrrrrrrrrrrrr
Word
Bit Position
1514131211109876543210
000000000r/wr/wr/wr/wr/wr/wr/wr/w
Word
Bit Position
1514131211109876543210
0 r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w r/w