Allen-Bradley 1771-ASC Remote IO Adapter Module

The Allen-Bradley 1771-ASC Remote I/O Adapter Module is the slave interface that connects a PLC’s controller to a Remote I/O rack in the 1771 I/O family. It resides in a Universal I/O chassis and serves as the bridge between the host controller and the remote I/O modules, enabling distributed I/O across a Rockwell Automation 1771 network. As Series A of the 1771-ASC family, this adapter supports mapping I/O to the controller in 2-slot, 1-slot, or 1/2-slot groups, providing flexible addressing for varying I/O densities. Designed for use with older AB controllers such as PLC-5 and other 1771-based systems, the 1771-ASC allows control of remote modules without requiring a direct processor connection to each rack. 1771-ASC can be used alongside 1771-ASB/B and other 1771 remote I/O modules within the same remote I/O assembly, per documentation for the 1771 Remote I/O architecture. Typical applications include expanding discrete input/output in legacy manufacturing lines, packaging, and process-control setups where Remote I/O racks are deployed to locate I/O closer to field devices. The module is a compact, slot-based interface that forms part of Rockwell Automation’s 1771 Remote I/O ecosystem, enabling a host controller to address a remote image of I/O across the network.