The Allen-Bradley 1771-P2 is an auxiliary power supply for PLC-5/SLC-500 I/O racks, converting incoming 120/240 VAC into a regulated 5.1 V DC rail to power 1771 I/O modules. The unit is rated at 75 VA and supports 120 or 240 VAC input, aligning with common PLC-5/SLC-500 installation configurations. As a legacy component, Rockwell Automation lists the 1771-P2 as discontinued as of December 31, 2017, with engineering replacement guidance for ongoing maintenance. Typical applications include PLC-5 retrofits and SLC-500 I/O chassis that require an independent 5 V supply to maintain bus power for I/O modules.
