OVERVIEW

Official designation: Allen-Bradley 1775-GA (PLC-3, Peripheral Communication Module)

Role/Application: This module is a legacy PLC-3 peripheral communication system component, providing local and remote channels for extensive communication with external devices like terminals, modems, and computers for programming and data storage.

KEY SPECS SUMMARY

Power: +15V DC at 130mA, -15V DC at 130mA

Interfaces / Ports: Local channel connectors, remote channel terminal arm

Indicators: Pass, Fail, Local Channel Active, Remote Channel Active LEDs

Operating Temp: 0 to 60 degrees C

Platform / Compatibility: PLC-3 processor system, 1771-I/O chassis

Limit: Discontinued, up to 16 Peripheral Interface Adapter Modules (1775-RM) per remote channel

Lifecycle: Discontinued/Obsolete

FREQUENTLY ASKED QUESTIONS

Technical Specifications:

Q: What are the cable distance limits for peripheral devices connected via the 1775-RM adapter?

A: RS-232-C compatible devices can be up to 5000 cable feet away if they have a line driver/receiver.

Wiring & Installation:

Q: How is the 1775-GA module physically installed into the PLC-3 system?

A: The module occupies a single slot in any 1771-I/O chassis of the PLC-3 system.

Troubleshooting & Compatibility:

Q: What is the meaning of the red FAIL indicator LED on the front edge of the module?

A: The red FAIL indicator illuminates when a module fault condition exists, indicating an abnormal operating status.

Replacement & Upgrades:

Q: What is the most common successor module or recommended migration path for the obsolete 1775-GA?

A: Refer to the latest manufacturer manual for the recommended migration path, as this module is obsolete.