AB Allen Bradley 1756-PBR2 Redundant Power Supply Module

Product Summary

The 1756-PBR2 is a ControlLogix redundant power supply bundle. It consists of two 1756-PB72 power supplies designed for use in redundant power configurations to provide high availability in critical ControlLogix systems.

Core Specifications

• Catalog Number: 1756-PBR2 (redundant bundle)
• Power Supply Type: 24 VDC Redundant Power Supply
• Output Power: 75 W (per supply)
• Input Voltage: 18–32 VDC
• Redundancy: Supports N+1 or fully redundant power configurations

Electrical & Performance Characteristics

• Function: Provides redundant 24 VDC power to the ControlLogix chassis for increased system availability
• Diagnostics: Power supply status monitoring and fault reporting to the controller
• Operating Temperature: 0°C to 60°C (32°F to 140°F)

Installation Guide

1. Install two 1756-PB72 power supplies in the designated power supply slots of the 1756 chassis (or redundant power supply chassis).
2. Connect the 24 VDC input power to both supplies.
3. Configure redundancy monitoring in the controller project if required.
4. Verify power supply status LEDs and controller diagnostics.

Selection Guidelines

• Use 1756-PBR2 for applications requiring redundant power supplies in ControlLogix systems to maximize uptime.
• For non-redundant applications, select individual 1756-PB72 or other power supply variants.
• Ensure total system power consumption does not exceed the combined capacity of the redundant supplies.

Frequently Asked Questions