Allen Bradley 1771-P4R | PLC-5 Redundant Power Supply Module

Product Description

The Allen Bradley 1771-P4R is a redundant power supply module designed for the PLC-5 system. It ensures reliable operation by supporting N+1 redundancy configurations, making it suitable for critical industrial automation environments where uninterrupted power is essential. Compact and efficient, this module provides stable 5 VDC output with high current capacity and integrated alarm relay functionality.

Technical Specifications

• Manufacturer: Allen Bradley

• Category: PLCs

• Product Line: PLC-5

• Part Number: 1771-P4R

• Weight: 2.00 lbs (0.91 kg)

• Input Voltage Range: 97–132 VAC

• Nominal Input Voltage: 120 VAC

• Input Voltage Frequency: 47–63 Hz

• Module Type: Redundant Power Supply

• Output Voltage: 5 VDC

• Backplane Output Current: 8 Amperes (at 5 VDC)

• Maximum Output Current (N+1 Redundancy): 8A (2-unit system), 14A (3-unit system), 20A (4-unit system)

• Alarm Relay Rating: 250 VAC

• Wiring Block AC Power: A-B PN 941274-05 (Wago PN 231-205/000-008)

• Wiring Block Relay: A-B PN 941274-03 (Wago PN 231-203/000-008)

• Operating Temperature: 32 to 131 °F (0 to 55 °C)

• Storage Temperature: -40 to 185 °F (-40 to 85 °C)

• Relative Humidity: 5–95 % non-condensing

• Max Real Input Power: 59 W

• Max Apparent Input Power: 92 VA

• Max Transformer Load: 148 VA

• Fuse: 1.5 A, 250 V, slow-blow type

• Cabling: Redundancy cable for P4R (included)

• Location: 1771 Chassis, 1 Slot

Application Scenarios

• Designed for PLC-5 systems requiring redundant power supply for critical operations

• Ideal for manufacturing, process control, and continuous operation environments

• Provides fault tolerance and system reliability in multi-unit redundancy setups

FAQ

Q: Can the 1771-P4R operate independently without redundancy?  A: Yes, it can function as a single power supply, but its primary design is for redundant configurations.

Q: What is the maximum redundancy supported?  A: Up to four units can be paralleled, providing a maximum of 20A output at 60 °C.

Q: Is the redundancy cable included?  A: Yes, the redundancy cable is supplied with the module.

Comparison with Similar Models

• 1771-P4R: Redundant power supply, supports N+1 configurations, 5 VDC output

• 1771-P7: Standard power supply, no redundancy support, lower current capacity

• 1771-P4S: Single power supply version, suitable for non-critical applications