MicroLogix 1500 System

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MicroLogix 1500 Processors

Introduction Specifications
MicroLogix 1500 Processors

The standard MicroLogix 1500 processor (1764-LSP) provides 7.65K words of user-configurable memory for program and data. The enhanced MicroLogix 1500 processor (1764-LRP) provides 14K words of user-configurable memory for program and data. An optional memory module (1764-MM1 or -MM2) can be installed to back up the program and data. A backup memory and real-time clock module (1764-MM1RTC or -MM2RTC), or the real-time clock only module (catalog number 1764-RTC) can be installed separately instead of a memory module.

Program and data file sizes are user-configurable. Maximum user data is 4K words.


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You can create long-integer data files (32-bit signed integer, ±2 billion) for use with math and embedded high-speed I/O instructions. You can also create floating point data files, each of which can contain up to 256 IEEE-754 floating point data elements.

The MicroLogix 1500 processes a typical 1K word user program (including bit, timer, counter, and math instructions) in approximately 1ms. Programs are created using Windows-based RSLogix 500 programming software. Programs written for other Allen-Bradley MicroLogix and SLC 500 controllers can be easily modified for use with the MicroLogix 1500 controller.

Two built-in 3/4-turn analog trim potentiometers with a digital output (range from 0 to 250) allow quick and easy adjustments of timers, counters, set points, and more. The optional Data Access Tool (catalog number 1764-DAT) adds the functions of 48 electronic push buttons, 48 electronic digital trim potentiometers, and two function keys. Trim potentiometer and Data Access Tool data is available to the user program through built-in function files.

The MicroLogix 1500 processor supports backplane messaging, which allows the processor to read or write data to other devices on DeviceNet. PCCC and CIP messaging are supported. Processor memory includes function files that store user-specified configuration data for system resources: