Allen-Bradley 1771-ASB D Remote I/O Adapter Module

The Allen-Bradley 1771-ASB D Remote I/O Adapter Module is a PLC-5 era interface that sits in a Universal I/O Chassis and acts as the slave on a 1771 Remote I/O subnet to connect a PLC-5 controller with remote I/O racks. As Series D, Revision H, this module integrates into the 1771 Remote I/O family and provides the link between the PLC-5 processor and the remote 1771 I/O modules, enabling distributed data flow across multiple racks. On the network, it handles addressing and data exchange to support distributed digital and analog I/O, allowing the PLC-5 to read inputs and drive outputs from remote modules while centralizing control logic in the controller. The 1771-ASB D is designed for use with Allen-Bradley 1771 I/O modules within PLC-5 Universal I/O environments, aligning with the PLC-5 Remote I/O (RIO) architecture and its backplane interface. Typical applications include manufacturing lines, packaging systems, and process-control installations where sensors, actuators, and auxiliary I/O are distributed across remote racks but managed by a single PLC-5 system.