The Allen Bradley 1769-PB4 is a Compact I/O DC power supply module designed to provide higher backplane current capacity for expanded CompactLogix and 1769 I/O systems. It is typically used in applications where multiple I/O modules are distributed across a larger control architecture requiring stable and scalable DC power distribution.
Compared with lower-capacity variants, the PB4 supports higher 5V and 24V backplane current, making it suitable for denser I/O configurations and more complex automation panels.
Technical Specifications (Electrical & Mechanical)
| Parameter | Specification |
|---|---|
| Manufacturer | Allen Bradley (Rockwell Automation) |
| Catalog Number | 1769-PB4 |
| Module Type | Compact I/O Power Supply |
| Input Voltage | 19.2 – 31.2 V DC (nominal 24 V DC) |
| Output Capacity | 4.0 A @ 5 V DC / 2.0 A @ 24 V DC |
| Power Consumption | ~100 VA @ 24 V DC |
| Inrush Current | Up to 30 A @ 31.2 V DC |
| Power Dissipation | ~14.5 W @ 60°C |
| I/O Bank Support | Up to 16 Compact I/O modules (8 per side) |
| Isolation Voltage | 75 V continuous (reinforced insulation) |
| Mounting Type | DIN rail / panel mount |
| Operating Temperature | 0°C to 60°C |
| Storage Temperature | -40°C to 85°C |
| Dimensions | 118 × 70 × 87 mm |
| Weight | Approx. 0.63 kg |
System Role and Installation Context
The 1769-PB4 is used as a central power distribution point within Compact I/O expansion racks. It ensures stable backplane voltage for both controller-adjacent and extended I/O modules.
It is commonly selected when:
- Expanding CompactLogix I/O capacity beyond basic power limits
- Designing multi-module industrial control panels
- Supporting mixed analog + digital I/O architectures
- Building scalable OEM machine control systems
Recommended Related Modules
| Model | Function |
|---|---|
| 1769-L33ER | CompactLogix Controller |
| 1769-ECR | End Cap Module |
| 1769-PA2 | AC Input Power Supply Variant |
| 1769-IF8 | Analog Input Module |
| 1769-OB16 | Digital Output Module |
| 1769-OW8 | Relay Output Module |
Common Allen Bradley Automation Modules
| Model | Role |
|---|---|
| 1756-L81E | ControlLogix Processor |
| 1756-EN2T | EtherNet/IP Communication Module |
| 1734-AENTR | POINT I/O Adapter |
| 5069-IB16 | Compact 5000 Input Module |
| 2711P-T10C4D8 | PanelView HMI Terminal |
| 2080-LC50-48QWB | Micro850 Controller |
