Allen-Bradley 1775GA Communication Module

Allen-Bradley 1775-GA Peripheral Communication Module is a PLC-3 module that provides a dedicated communications interface between a PLC-3 controller and external peripherals within classic Rockwell Automation architectures. Designed for integration with PLC-3 series systems, this module enables data exchanges and peripheral connectivity in aging control panels built around the PLC-3 family. Some listings indicate the unit ships with a Wiring Arm, the mounting accessory that facilitates proper installation and signal routing in backplanes. Typical uses include linking a PLC-3 processor to peripheral devices such as printers and data-collection terminals that were common in mid-1980s to early-1990s industrial setups. As a legacy module, it remains encountered in rebuilt or used stock for retrofitting or maintaining older PLC-3 installations, where a stable peripheral communications interface is still required.