Allen-Bradley 1771-P7 is a stand-alone DC power supply assembly for the PLC-5 1771 I/O backplane, delivering 5 VDC to the backplane at up to 16 A. It accepts AC input in the 120 to 240 VAC range (commonly specified as 120/220 VAC) and provides a regulated 5 V output for the I/O chassis. The unit is designed to power a single 1771-A1B, -A2B, or -A3B I/O chassis, making it a common choice when an internal power supply is not available in the rack. As a dedicated 1771 power supply assembly, it integrates with 1771 I/O backplanes in PLC-5 systems to support reliable I/O operation.
