1756-PBR2 | Allen-Bradley ControlLogix Redundant Power Supply Module

Product Overview

The Allen-Bradley 1756-PBR2 operates as a high-capacity redundant power supply module designed specifically for the ControlLogix platform. It provides regulated DC voltages to the chassis backplane, ensuring continuous operation of processors and I/O modules even during power hardware transitions. This module integrates into redundant power configurations to prevent system downtime caused by single-point power failures. We offer this unit as 100% Brand New and Original, providing the voltage stability required for high-availability industrial architectures.

Technical Specifications

The 1756-PBR2 delivers multiple voltage rails to support the diverse power requirements of ControlLogix hardware.

Engineering Advantages

• Redundant System Integrity: This module connects to a 1756-PSCA2 chassis adapter. When paired with a second 1756-PBR2, the system maintains full backplane power if one supply fails, allowing for hot-swappable replacement without interrupting the process.

• Superior Current Sourcing: By providing 13 Amps at the 5V DC rail, this supply supports high-density I/O configurations and multiple communication modules within a single 1756 chassis. It eliminates the "power budget" bottlenecks common in complex automation racks.

• Enhanced Heat Management: The module consumes only 4 Watts of internal power at maximum load. This low power dissipation reduces the thermal footprint within the enclosure, extending the lifespan of adjacent CPU and motion modules.

• Precision Voltage Regulation: The 1756-PBR2 filters input fluctuations to deliver clean, ripple-free 1.2V and 3.3V power to sensitive logic modules. This prevents data corruption and hardware latch-up issues caused by noisy industrial power grids.

FAQs

• Do I need a special adapter to use the 1756-PBR2 in a redundant setup? Yes. You must use the 1756-PSCA2 Redundant Power Chassis Adapter. The 1756-PBR2 mounts externally to the chassis and connects through this adapter to provide power redundancy to the backplane.

• Can I use the 1756-PBR2 as a standalone (non-redundant) power supply? While primarily designed for redundancy, the 1756-PBR2 functions as a high-output 24V DC-powered supply. However, for standard non-redundant applications, engineers typically select the 1756-PB72 or 1756-PB75.

• How does the module signal a power failure? The module includes diagnostic LEDs and a status signal that interfaces with the ControlLogix controller. The system triggers an alarm immediately if the input voltage drops below the operating threshold or if an internal fault occurs.

• Does this module support AC input voltage? No. The 1756-PBR2 requires a 24V DC nominal input. If your facility only provides AC power, you should select the 1756-PA72 or 1756-PAR2 (for redundant AC requirements).