OVERVIEW

Official designation: Allen-Bradley 1764-MM3 (MicroLogix 1500, Memory Module)

Role/Application: Optional 16 Kbytes memory module for MicroLogix 1500 controllers, primarily used for non-volatile storage of user program and data file backup and transfer.

KEY SPECS SUMMARY

Power: Not applicable, non-volatile memory

Interfaces / Ports: Memory module slot (internal)

Indicators: Program compare status file S:2/9

Operating Temp: 0 to 55 degrees C

Platform / Compatibility: 1764-LSP and 1764-LRP controllers

Limit: 16 Kbytes user program and data

Lifecycle: Discontinued/Obsolete

FREQUENTLY ASKED QUESTIONS

Technical Specifications:

Q: What is the exact memory capacity provided by the 1764-MM3 module?

A: The module provides a total of 16 Kbytes of user program and data storage.

Wiring & Installation:

Q: Does the 1764-MM3 support insertion and removal while the MicroLogix 1500 controller is powered on?

A: Yes, the module is designed to support removal and insertion under power.

Troubleshooting & Compatibility:

Q: What is the function of control bit S:1/11, Load Memory Module Always, related to this module?

A: When set, this bit forces the CPU to load the program from the memory module on every power-up event.

Replacement & Upgrades:

Q: Is the Allen-Bradley 1764-MM3 memory module still actively sold and supported by the manufacturer?

A: No, the 1764-MM3 memory module has been Discontinued/Obsolete and has no designated direct replacement.