The Allen-Bradley 1771-P7 PLC-5 Power Supply Module is an external 5V DC source that powers the backplane of 1771 I/O racks in PLC-5 and Mini-PLC systems. It can power one 1771-A1B, -A2B, -A3B, -A3B1, or -A4B I/O chassis, or a PLC-5 family processor when used with an adapter module or CPU that does not have an internal power supply. This 1771 power supply is part of the 1771 PLC-5 family and delivers the backplane power required by connected I/O modules to operate reliably in legacy control installations.
