Allen‑Bradley 1771‑P4SB Power Supply Module

The Allen‑Bradley 1771‑P4SB is a rack‑mount power supply module for Rockwell PLC‑5 and 1771 I/O chassis systems. It converts input power into stable DC power to supply the 1771 backplane, providing power for CPU, communication adapters and various I/O modules installed in the rack.

This plug‑in power unit integrates overvoltage, overcurrent and short‑circuit protection circuits. Equipped with power status indicators, it is widely stocked as spare parts for maintenance and upgrade of legacy 1771 automation cabinets in manufacturing, water treatment and chemical plants.

Main Specifications

• Brand: Allen‑Bradley (Rockwell Automation); Model: 1771‑P4SB; Type: Chassis Power Supply Module
• Applicable System: PLC‑5 controller, 1771 series I/O rack platform
• Core Tasks: Power conversion, backplane power distribution, circuit fault protection, power status monitoring
• Signal Interface: Power input terminals, 1771 rack backplane power connector
• Installation: Plug‑in slot‑mount on standard 1771 I/O chassis rack
• Input Type: AC power input, converted to regulated DC power for rack modules
• Operating Environment: 0℃ ~ +60℃, 5%‑95% RH non‑condensing, industrial anti‑vibration grade
• Mechanical: Standard 1771 series module form‑factor, IP20 cabinet‑mount installation
• Certifications: CE, conforms to Rockwell legacy automation EMC and safety requirements

Core Functions

• Convert input AC power into steady DC power and distribute power to the entire 1771 chassis backplane for all rack‑mounted PLC‑5 modules.
• Built‑in multi‑protection mechanisms including overvoltage, overcurrent and short‑circuit protection to prevent damage to control hardware caused by power anomalies.
• Front‑panel LED indicator shows real‑time power working status to assist engineers with on‑site inspection and rapid fault troubleshooting.
• Support normal power supply configuration for legacy 1771 racks, meeting the continuous operation requirements of old production control systems.
• Adopt chassis plug‑in design for quick installation, removal and replacement during cabinet maintenance.
• Industrial‑hardened power circuit ensures long‑term reliable operation for renovation projects of end‑of‑life PLC‑5 automation equipment.

Application Scenarios

• Spare‑part replacement for legacy PLC‑5 automation cabinets in manufacturing, water treatment and chemical industrial sites.
• Backplane power supply hardware providing stable power for PLC‑5 CPU, communication modules and 1771 I/O modules.
• Maintenance backup inventory for renovation and after‑sales maintenance projects of end‑of‑life Rockwell PLC‑5 automation equipment.
• Matching power supply cooperating with 1771 chassis, PLC‑5 CPU, digital and analog I/O modules.
• Retrofit replacement for aged power modules with no output, indicator failure and internal circuit burnout faults.

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