Description: The 1764-LRP is an Allen-Bradley manufactured MicroLogix 1500 module that functions as a processor unit. The 1764-LRP has a 14 KB memory and DH-485, Modbus, DF1, and ASCII communication ports. All of this module’s communication ports can be configured independently for any protocol that is supported. This unit works with Series B or higher. 1764-LRP Communication Cable.

1 year Warranty Included



The Allen-Bradley 1764-LRP is an Enhanced MicroLogix 1500 Processor. It is a component of MicroLogix 1500 Programmable Controllers that offers a large-memory solution to a variety of applications. It provides 14K words of user-configurable memory for data and programs. It comes with a program execution time of approximately 1 millisecond for a 1K-word program (including bit, counter, timer, and math instructions). In a controller system, the 1764-LRP Processor Unit provides the trim potentiometers, a Run/Remote/Program mode switch, a communication toggle push button, and logic processing. It serves as an interface to the real-time clock, the DAT, and the memory modules. This processor uses a controller assembly to support a maximum of eight I/O modules in an additional I/O bank. For programming, this processor uses the RSLogix 500, Version 4.0 or higher.

The 1764-LRP Processor comes with an additional communications port, DTE (male) 9-pin D-shell connector with a 30 Volt DC isolation. This RS-232 port is electrically isolated and used for peer-to-peer and SCADA/RTU networks, DeviceNet, EtherNet/IP, and the DH-485 ports. It can be separately configured (Channel 1) for any supported communication protocol. Because the 1764-LRP is an enhanced version of the standard processing unit, an isolator is not required when connecting a MicroLogix controller system that is using the 1764-LRP to a computer. This module requires a backup battery once its battery indicator light turns on, as the original battery will only last for at least 7 days.

Technical Specifications


Rockwell Automation



Part Number/Catalog No.



MicroLogix 1500


Processor Unit


14 KB

Communication Ports

DH-485, Modbus, DF1, and ACSII

Enclosure Type


Output Source

Relay Port and DC FET

Programming Software

RSLogix 500, Version 5.00.00 or higher

Word Memory

14K word memory

Communication Cable


Heat Dissipation

1.9 Watts



Product Lifecycle Status*