The Allen Bradley 1771-P4S is a PLC-5 series rack-mounted power supply module designed for the 1771 I/O chassis platform. It provides regulated 5V DC backplane power to support all installed I/O modules within the PLC-5 system.
This module is essential for stable system operation, ensuring consistent voltage supply for processors, input/output modules, and communication interfaces in industrial automation environments.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Allen Bradley (Rockwell Automation) |
| Catalog Number | 1771-P4S |
| Module Type | PLC-5 Power Supply Module |
| System Family | 1771 I/O / PLC-5 |
| Input Voltage | 97–132V AC |
| Nominal Input | 120V AC |
| Input Frequency | 47–63 Hz |
| Output Voltage | 5V DC (backplane) |
| Output Current | up to 8 A |
| Power Capacity | ~59 W |
| Fuse Rating | 1.5 A slow-blow, 250V |
| Parallel Operation | Supported (dual supply configuration) |
| Backplane Support | 1771-A1B / A2B / A3B / A4B chassis |
| Mounting Type | 1-slot chassis module |
| Cooling Method | Natural convection |
| Backplane Interface | Direct chassis connection |
| Operating Temperature | 0°C to 60°C |
| Storage Temperature | -40°C to 85°C |
| Weight | ~0.88 kg |
| Dimensions (L×W×H) | 305 mm × 254 mm × 229 mm |
System Role Overview
The 1771-P4S plays a critical role as the main power backbone of PLC-5 systems, supplying regulated 5V DC power to all modules installed in the I/O chassis.
Core functions include:
- Providing stable backplane power for PLC-5 modules
- Supporting CPU, I/O, and communication module operation
- Enabling system-wide power distribution
- Supporting redundant/parallel power configurations
- Ensuring voltage stability in industrial environments
It is the foundation component that enables reliable PLC-5 system operation.
Recommended Related Modules
| Model | Function |
|---|---|
| 1771-A4B | 16-slot I/O chassis |
| 1771-ALX | Local I/O adapter module |
| 1771-SN | I/O scanner module |
| 1771-DMC | Data Highway communication module |
| 1771-OBD | DC output module |
| 1771-IFE | Analog input module |
Popular Allen Bradley PLC-5 Modules
| Model | Function |
|---|---|
| 1785-L40B | PLC-5 processor module |
| 1771-A1B | Small I/O chassis |
| 1771-A4B | Standard I/O chassis |
| 1771-DMC | Communication module |
| 1771-SN | Remote I/O scanner |
