Allen-Bradley 1771-P2 Power Supply Module for SLC 500

Allen-Bradley 1771-P2 Power Supply Module for SLC 500 is an auxiliary power supply that delivers the +5.1 V DC rail to a single 1771 I/O chassis in legacy AB systems. It accepts 120 VAC input (50/60 Hz) and can operate from 220–240 VAC, drawing roughly 0.75 A at 120 V or 0.38 A at 230 V, and it includes a 1 A slow‑blow fuse for protection. This bulletin 1771 power supply is designed to power a 1771 I/O chassis when used with an adapter module or with a 1772 Mini‑PLC‑2 processor, enabling the I/O rack to operate independently of the main processor’s power rail. The module is commonly described as the PLC‑5/SLC‑500 auxiliary power solution for the 1771 I/O system, supporting the operation of the I/O modules within the same rack and helping to maintain stable voltage supply in older Allen‑Bradley architectures.