A-B 1769-PA4 Power Supply Module

Allen-Bradley 1769-PA4 Power Supply Module (CompactLogix)

 

 

The Allen-Bradley 1769-PA4 is an AC power supply module used in the CompactLogix / 1769 I/O system. It provides regulated DC power to the Compact I/O backplane, allowing the PLC controller and connected I/O modules to operate reliably.

It is one of the main power supply options for CompactLogix systems, especially in AC-powered control panels.

Key Specifications

• Model: 1769-PA4
• Brand: Allen-Bradley (Rockwell Automation)
• Series: CompactLogix 1769
• Product Type: AC Power Supply Module
• Input Voltage:
  • 85–265 VAC (wide range, selectable)
• Output Power:
  • 4A @ 5V DC
  • 2A @ 24V DC
• Output Function:
  • Supplies backplane power for 1769 I/O modules
• Mounting:
  • DIN rail (left side of I/O bank)
• Operating Temperature:
  • 0–60°C
• Frequency:
  • 47–63 Hz

(verified from Rockwell product technical data)

What it does (simple explanation)

AC Power Input
↓
1769-PA4 Power Supply
↓
CompactLogix backplane
↓
CPU + I/O modules powered and operating

It converts AC mains power into stable low-voltage DC power required by the CompactLogix system.

Main Functions

• Powers CompactLogix 1769 I/O system
• Provides 5V DC and 24V DC backplane power
• Supplies energy to CPU and I/O modules
• Ensures stable PLC system operation
• Supports modular expansion of I/O banks

Key Features

• Wide AC input range (85–265 VAC)
• Compact DIN-rail design
• Reliable industrial-grade power conversion
• Supports multiple I/O modules on left/right expansion banks
• Built-in protection (overload / fault protection)
• Easy installation in control cabinets

System Role

Power Flow:

AC Input → 1769-PA4 → Backplane → CPU (1769-L series) + I/O modules

So it is:

• ❌ Not a PLC CPU
• ❌ Not a communication module
• ❌ Not an input/output module
• ✔ A CompactLogix system power supply

Applications

• CompactLogix PLC control cabinets
• Factory automation systems
• Packaging machinery
• Conveyor systems
• OEM machine control panels
• Industrial process control systems