Overview
The Allen-Bradley 1771-P7 is an external AC power supply module engineered for PLC-5 automation systems and Allen-Bradley 1771 I/O chassis configurations. This used unit delivers regulated 5 VDC output at up to 16 amperes, making it ideal for powering processor backplanes and I/O modules in legacy industrial control environments. The 1771-P7 accepts wide-range AC input (97–264 VAC at 50/60 Hz) and provides the stable, isolated power required for reliable PLC operations.
Key Features
- 16-Ampere Output: Regulated 5 VDC at 16A maximum backplane current capacity
- Dual-Voltage Input: Operates on 120 VAC (97–132V) or 220 VAC (195–264V) nominal without reconfiguration
- Stand-Alone Design: External power supply operates independently—cannot be paralleled with other power supplies
- Industrial Certifications: UL Listed, CE marked, meets industrial isolation and safety standards
- Wide Input Range: 50/60 Hz compatible for global deployment in industrial facilities
Technical Specifications
- Output Voltage: 5.06 VDC (±3.8%)
- Output Current: 16 A maximum (backplane)
- Input Voltage (120V): 97–132 VAC, 2.0A, 50/60 Hz
- Input Voltage (220V): 195–264 VAC, 1.3A, 50/60 Hz
- Real Input Power: 108 W maximum
- Apparent Power: 176 VA maximum
- External Transformer Rating: 270 VA full load
- Isolation Voltage: 1200 VAC for 1 second
- Operating Temperature: 0°C to 60°C (32°F to 140°F) typical
- Frequency: 50/60 Hz
- Connector Type: D-shell power connector for PLC-5 backplane attachment
- Weight: 6.95 lb
Typical Applications
The 1771-P7 power supply is used in:
- PLC-5 control systems requiring external power distribution
- 1771 I/O chassis installations with Mini-PLC-2/02, 2/05, 2/16, 2/17 or PLC-5 processors
- Manufacturing equipment retrofits where PLC-5 platforms remain in service
- Machine tool control systems and industrial production lines
- Legacy automation installations requiring backplane power stabilization
Compatibility & Replacements
Compatible With
- PLC-5 family processors (full line)
- Mini-PLC-2/02, Mini-PLC-2/05, Mini-PLC-2/16, Mini-PLC-2/17 controllers
- 1771-A1B, 1771-A2B, 1771-A3B, 1771-A3B1, 1771-A4B I/O chassis
- 1771 adapter modules for processor integration
- Allen-Bradley PLC-5 backplane architecture systems
Replaces / Drop-In Replacement For
- 1771-P7 Series A, B, C, and D units (backward compatible across series revisions)
- Direct replacement in existing 1771 I/O configurations
- Verify current system configuration jumper settings before installation
Works With
- D-shell connector power cable family: 1771-CP1 (0.32m), 1771-CP2 (1.52m), 1771-CP3 (1.68m)
- PLC-5 standard backplane power delivery architecture
- Industrial environments requiring 97–264 VAC power availability
- Systems not requiring internal power supply modules in the processor
