Allen-Bradley 1771-A1B PLC-5 I/O Chassis is a four-slot, back-panel-mount rack designed to house PLC-5 I/O modules on a single 1771 backplane. As part of the PLC-5 I/O system, this chassis provides the physical housing and backplane necessary to expand digital and analog I/O for PLC-5 controllers, enabling straightforward wiring and module replacement in industrial automation setups. Typical applications include remote I/O expansion and panel-mount installations where a PLC-5 processor manages I/O for manufacturing lines and process control; 1771-A1B chassis are commonly used with other 1771 I/O modules within the PLC-5 family.
