Allen‑Bradley 1756‑PA75 ControlLogix AC Power Supply Module

The Allen‑Bradley 1756‑PA75 is an AC input power supply module for Rockwell ControlLogix PLC chassis. It converts AC mains power into regulated DC power to supply the ControlLogix backplane, supporting CPU, communication modules and various I/O modules installed on the same rack.

This rack‑mount plug‑in unit provides built‑in overvoltage, overcurrent and short‑circuit protection. It features status LED indicators for health monitoring and supports redundant power configuration, widely deployed in manufacturing, water treatment and petrochemical ControlLogix automation cabinets.

Main Specifications

• Brand: Allen‑Bradley (Rockwell Automation); Model: 1756‑PA75; Type: AC Power Supply Module
• Applicable System: ControlLogix PLC automation platform
• Core Tasks: AC‑to‑DC power conversion, chassis backplane power distribution, over‑fault protection, power status monitoring
• Signal Interface: AC power input terminals, ControlLogix backplane power connector
• Installation: Plug‑in slot‑mount on standard ControlLogix chassis rack
• Input Range: 85‑264 VAC, 47‑63 Hz, output for ControlLogix backplane
• Operating Environment: 0℃ ~ +60℃, 5%‑95% RH non‑condensing, industrial anti‑vibration grade
• Mechanical: Standard ControlLogix module form‑factor, IP20 cabinet‑mount installation
• Certifications: CE, compliant with Rockwell industrial automation EMC and safety standards

Core Functions

• Convert wide‑range AC input into stable DC power and distribute power to the entire ControlLogix chassis backplane for all rack‑mounted modules.
• Integrate multiple protection mechanisms including overvoltage, overcurrent and short‑circuit protection to avoid damage to CPU and I/O modules caused by power anomalies.
• Front‑panel LED indicators visually display power working status for quick inspection and fault diagnosis during on‑site maintenance.
• Support dual redundant power supply configuration to improve system reliability for critical production units requiring uninterrupted control.
• Adopt rack plug‑in design for convenient installation, removal and replacement inside standard industrial control cabinets.
• Industrial‑hardened power circuit design ensures long‑term stable power supply under continuous industrial operating conditions.

Application Scenarios

• Spare‑part replacement for ControlLogix automation cabinets in manufacturing, water treatment, petrochemical and power plant sites.
• Backplane power supply hardware providing stable DC power for ControlLogix CPU, communication modules and I/O modules.
• Maintenance backup inventory for renovation and after‑sales maintenance projects of Rockwell ControlLogix automation equipment.
• Matching power supply cooperating with ControlLogix chassis, CPU, analog/digital I/O modules and communication adapters.
• Retrofit replacement for aged power modules with no output, abnormal indicator and internal circuit burnout faults.

• Global aftermarket spare supply for automation maintenance teams maintaining Rockwell industrial‑control equipment worldwide.