OVERVIEW

Official designation: Allen-Bradley 1775-ME8 (PLC-3, Error-Correcting RAM Memory Module)

Role/Application: The 1775-ME8 module provides 32K words of RAM for the PLC-3 processor with built-in error detection and correction to enhance program and data integrity.

KEY SPECS SUMMARY

Power: 15 Volts DC, 2.6 Amps

Interfaces / Ports: Backplane connector

Indicators: Refer to the latest manufacturer manual.

Operating Temp: 0 to 60 degrees C

Platform / Compatibility: PLC-3 processor chassis, 1775-A1, 1775-A2

Limit: Memory capacity is 32,768 words

Lifecycle: Discontinued/Obsolete

FREQUENTLY ASKED QUESTIONS

Technical Specifications:

Q: What is the rated memory capacity of the Allen-Bradley 1775-ME8 module in words?

A: The module provides a memory capacity of 32,768 words of Error-Correcting RAM.

Wiring & Installation:

Q: Does the 1775-ME8 module require a battery for program data retention when the chassis power is off?

A: Yes, the module utilizes a battery backup to retain program data when the PLC controller is unpowered.

Troubleshooting & Compatibility:

Q: What type of memory errors does the error correction function of the 1775-ME8 module handle?

A: The module is designed to detect and correct single bit memory errors immediately.

Replacement & Upgrades:

Q: What is the recommended upgrade path for systems currently using the obsolete Allen-Bradley PLC-3 controller and 1775-ME8?

A: The recommended long-term system migration path is to the modern Allen-Bradley ControlLogix automation platform.