The Allen-Bradley 1771-P7 is a standalone AC power supply for PLC-5 era 1771 I/O backplanes. It accepts 120/240 VAC mains (auto-select, 50/60 Hz) and provides backplane power to a single 1771 I/O chassis, with a rated backplane current of up to 16 A. The 1771-P7 is compatible with 1771-A1B, -A2B, and -A3B backplanes, making it suitable for PLC-5 installations that require an external supply. Use it to power PLC-5 I/O modules—discrete, analog, and communication cards—while observing the 16 A current limit to ensure reliable operation.
