PLC Power Supply Module 1769-PB2 Allen-Bradley

Product Description

The Allen-Bradley 1769-PB2 is a DC input power supply module designed for CompactLogix and MicroLogix 1500 systems. It provides supplemental backplane power when the controller’s integrated supply is insufficient or when additional distributed I/O banks are required.
Built for industrial reliability, the 1769-PB2 features reinforced insulation and an extended power supply distance rating, enabling flexible system expansion while maintaining stable voltage and signal integrity.

Technical Specifications

System Placement and Installation

When installed in a CompactLogix system, the distance rating of the 1769-PB2 is a key design constraint. Each power supply can support up to eight I/O modules on either the left or right side.
The module is commonly installed in the second or third I/O bank to maintain regulated backplane voltage in high-density configurations. Mounting options include DIN rail (zinc-plated, yellow-chromate) or panel mounting for enhanced vibration resistance.

Frequently Asked Questions

Is the internal fuse field-replaceable?
No. The fuse is intended for catastrophic fault protection only and is not field-replaceable. A blown fuse typically requires module replacement or factory-level repair to maintain IEC Class 1 grounding and safety compliance.

What is the purpose of reinforced insulation?
Reinforced insulation electrically isolates the DC input from the system backplane, protecting CPUs and I/O modules from external noise, surge transients, and grounding disturbances.