Overview
The Allen-Bradley 1771-P7 is a stand-alone external AC power supply module designed for PLC-5 automation systems. It provides regulated 5V DC output to power I/O chassis and control modules within classic Allen-Bradley control architectures. This used unit is tested and ready for deployment in industrial automation environments where legacy PLC-5 systems remain critical infrastructure.
Key Features
- Stand-alone 16A AC power supply for PLC-5 systems
- Dual input voltage selection: 120V AC or 220V AC at 50/60 Hz
- Regulated 5V DC output with 16A maximum capacity at backplane
- External mounting design with D-shell power connector for chassis integration
- Industrial-grade isolation tested to 1200V AC for 1 second
- Compatible with multiple Mini-PLC-2 and PLC-5 processor families
Technical Specifications
The 1771-P7 operates from a wide input range: 120V AC (97–132V AC) at 2.0A, or 220V AC (195–264V AC) at 1.3A, both at 50/60 Hz. Maximum real input power is 108 Watts with apparent power of 176VA. The unit outputs 5.06V DC ±3.8% at up to 16A maximum for backplane current distribution. An external transformer rated at 270VA supports full-load operation.
Typical Applications
The 1771-P7 powers one 1771-A1B, -A2B, -A3B, -A3B1, or -A4B I/O chassis when used with an adapter module or PLC-5 family processor that lacks an internal power supply. It also supports Mini-PLC-2/02, Mini-PLC-2/05, Mini-PLC-2/16, and Mini-PLC-2/17 systems. Stand-alone configuration prevents processor memory loss or unsafe operation—never connect in parallel with other power supplies.
Compatibility & Replacements
Compatible With
- PLC-5 family processors and control systems
- Mini-PLC-2/02, Mini-PLC-2/05, Mini-PLC-2/16, Mini-PLC-2/17 controllers
- 1771-A1B, -A2B, -A3B, -A3B1, -A4B I/O chassis modules
- 1771 adapter modules for remote or panel-mounted configurations
- 50/60 Hz industrial electrical distribution systems
Replaces / Drop-In Replacement For
- Original 1771-P7 Series B, C, and D variants
- Verify specific series revision with your system documentation before ordering
Works With
- 1771-CP1, 1771-CP2, 1771-CP3 interconnect cables
- 1771 I/O module family
- Classic Allen-Bradley PLC-5 programming platforms (e.g., offline RSLogix 5, Studio 5000)
