WESTERN 1781-A4T I O Rack With Modules System

The Western Reserve Controls 1781-A4T I/O Rack With Modules is a panel-mounted PLC I/O rack built for reliable module mounting and signal interfacing in industrial automation and PLC control systems. It carries the MPN 1781-A4T / 1781A4T with a Secondary Reference of S17-3-106C and is classified as a PLC I/O Rack designed for module mounting and signal interfacing in industrial control panels and machine automation. Used in PLC cabinets, industrial control panels, and process/machine automation installations that require modular I/O integration, this rack provides the core hardware for scalable automation interfaces. Common replacements listed include WESTERN 1771-A4B I/O Chassis, Siemens SIMATIC S7 I/O Rack, and Opto 22 SNAP I/O Rack System.