Allen-Bradley 1771-AR Serial Communications Interface Module

Allen-Bradley 1771-AR Serial Communications Interface Module is a legacy 1771-series remote adapter that provides a dedicated serial interface for connecting a host device to an Allen-Bradley 1771 I/O network. The 1771-AR installs in a 1771 I/O rack and serves as a bridge between the controller backplane and external serial devices, enabling serialized data exchanges within older Rockwell Automation control architectures. Identified by its part number 1771-AR, this Remote Adapter Module is part of the broader 1771 family used in 1771 I/O systems, designed to extend serial connectivity to PLCs in legacy installations. Typical applications include data collection and remote control tasks on plant floors where legacy Allen-Bradley PLCs rely on serial communication links to peripheral devices or host systems. The module preserves the familiar 1771 form factor and backplane compatibility that automation engineers rely on when maintaining older equipment, making it a straightforward drop-in option for upgrading or maintaining serial connectivity in 1771-based networks.