Allen-Bradley 1771-A2B 8-Slot SLC Backplane Chassis

Allen-Bradley 1771-A2B is an 8-slot universal I/O backplane chassis for PLC‑5 1771 I/O modules, designed for back-panel mounting in a PLC‑5 control system. This -A2B size sits among the four‑to‑sixteen‑slot family (4-slot -A1B, 8-slot -A2B, 12-slot -A3B, 16-slot -A4B) and is specifically configured to house eight I/O slots. It measures 298 mm (11.75 in) high × 70 mm (2.75 in) wide × 187 mm (7.375 in) deep and weighs about 1.4 kg (3.0 lb), with the back-panel mounting form factor common to PLC‑5 chassis. The backplane is a 5 V DC supply with up to 8 A available to feed I/O modules, and it can accept a 1771‑P4S power supply module to power the I/O backplane. This chassis supports a broad range of 1771 I/O modules and compatible PLC‑5 remote I/O adapters, providing a scalable platform for expanding I/O in industrial environments.