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SKU: 1756-PBR2

Allen-Bradley 1756-PBR2 ControlLogix Redundant Power Supply

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Configured for high-availability DC power delivery in ControlLogix chassis, the Allen-Bradley 1756-PBR2 (1756-PBR2 Redundant Power Supply) provides direct physical/electrical execution. This module delivers regulated backplane current across the 1756 chassis structure, utilizing dual-supply load-sharing circuitry to prevent system downtime caused by primary source failures or line dropouts.

Hardware Specifications

ParameterSpecification
Model1756-PBR2
BrandAllen-Bradley
OriginUSA
Weight1.45 kg
Dimensions14.2 cm x 17.5 cm x 13.2 cm
Operating Temp0 to 60 deg C
Power Consumption24 VDC Nominal Input
Module TypeRedundant Power Supply
Range of ProductControlLogix
SystemPLC
HS Code8537101190

EtherNet/IP and Backplane Communications Integration

The power supply maintains continuous voltage regulation across the ControlLogix system backplane bus communication velocity frameworks without introducing voltage ripples during source switchover events. Diagnostic feedback channels interface with EtherNet/IP deterministic networks to report DC health status, power degradation warnings, and status indications to central Logix controllers. High-speed backplane integration guarantees firmware flash compatibility across connected I/O and processor cards during hot-swapping procedures.

Frequently Asked Questions

Q: Can the power supply module be replaced while the connected chassis is actively processing control loops?

A: Yes, the unit supports live hot-swapping. The secondary power supply in the redundant configuration maintains system backplane current during module removal without causing processor resets or I/O interruptions.

Q: What input power connection type is required for operation?

A: The module accepts a direct nominal 24 VDC input connection to feed internal regulation circuitry and drive chassis backplane power distribution.

Field Installation Guidelines

  • Cabinet Mounting and Clearance: Secure the chassis power supply assembly vertically using standard DIN-rail or panel-mounting hardware within an industrial enclosure. Ensure a minimum of 50 mm clearance above and below the module for natural thermal convection.
  • Grounding Protocols: Connect a heavy-gauge copper grounding wire from the module ground terminal directly to the enclosure main earth bus bar to mitigate electrical noise and transient surge risks.
  • Wiring and Isolation Limits: Route input 24 VDC conductors separately from high-voltage AC lines and high-frequency communication cables to prevent inductive noise coupling.
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Field Installation Guidelines

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Field Installation Guidelines

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ParameterSpecification
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  • Functional Status: Active
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