Allen-Bradley 1771-P7B is a standalone 5 V DC power supply for 1771 I/O backplanes in PLC-5/SLC 500 racks. It accepts 120/240 VAC input and provides a regulated +5 V DC output rated up to 16 A to power the rack’s I/O modules, including a single 1771-A1B, -A2B, or -A3B I/O module. The Series B designation identifies the revision of the 1771-P7 family used with legacy 1771 I/O backplanes in SLC 500 installations. This power module is designed specifically for backplane power in 1771 I/O chassis and works with standard 1771 backplanes and cabling.
