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- Allen Bradley
- 1769-PB4
- CompactLogix I/O Module
- USA
- 118 mm × 35 mm × 87 mm
- 0.63kg
- Xiamen, China
- New & In Stock
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Technical Report: Compact I/O Power Supply Module 1769-PB4
1. Product Overview
The 1769-PB4 is a high-capacity industrial DC input power supply module designed for Compact I/O PLC systems. It is used to provide stable backplane power for modular PLC architectures operating in DC-powered environments.
This module converts 19.2–31.2V DC input voltage into regulated 5V DC and 24V DC system power, supplying multiple I/O modules and controller components within a Compact I/O rack.
It is commonly used in medium-to-large automation systems requiring higher current capacity and stable DC power distribution.
2. Brand Information
- Brand: Industrial Automation Control Brand
- Product Category: PLC Power Supply Module
- Technology Field: Industrial Automation / DC Power Distribution Systems
- Manufacturing Origin: United States (varies by production batch)
3. Product Series
- Series Name: Compact I/O Series
- System Architecture: Modular PLC expansion platform
- Compatibility: Compact PLC controllers and 1769 I/O modules
- Installation Type: DIN rail backplane mounted system
This series supports scalable I/O expansion with centralized power distribution through modular rack design.
4. Product Introduction
The 1769-PB4 is designed for DC-powered automation systems where AC input is not available.
It provides dual regulated outputs:
- 5V DC logic power for CPU and communication modules
- 24V DC field power for I/O and field devices
The module supports up to 16 I/O modules (8 per side), making it suitable for expanded PLC systems with higher power demand.
5. Technical Parameters
5.1 Electrical Performance
| Parameter | Value |
|---|---|
| Input Voltage Range | 19.2–31.2 V DC |
| Nominal Input Voltage | 24 V DC |
| Output Voltage | 5 V DC / 24 V DC |
| Output Current @ 5V DC | 4.0 A |
| Output Current @ 24V DC | 2.0 A |
| Power Consumption | 100 VA @ 24 V DC |
| Inrush Current | up to 30 A @ 31.2 V DC |
| Power Dissipation | 14.5 W @ 60°C |
| Load Capacity | up to 16 modules total (8 per side) |
5.2 Electrical Isolation & Protection
| Parameter | Value |
|---|---|
| Isolation Voltage | 75 V continuous (reinforced insulation) |
| Dielectric Test Voltage | 1697 V DC for 1 second |
| Protection Type | Industrial reinforced insulation |
| Grounding Requirement | IEC Class 1 protective earth required |
| Internal Protection | Fuse-protected input stage |
5.3 System Power Distribution
| Parameter | Value |
|---|---|
| Backplane Power | Dual rail (5V + 24V DC) |
| Expansion Capability | 8 modules per side |
| Total System Modules | up to 16 modules |
| Distribution Method | Backplane bus architecture |
5.4 Physical Dimensions & Weight
| Parameter | Value |
|---|---|
| Height | 118 mm |
| Width | 70 mm |
| Depth | 87 mm |
| Mounting Type | DIN rail / panel mount |
| Weight | 0.63 kg (approx.) |
| Form Factor | Single-slot power module |
5.5 Wiring & Installation
| Parameter | Value |
|---|---|
| Wire Type | Copper conductor |
| Solid Wire Size | 14–22 AWG |
| Stranded Wire Size | 16–22 AWG |
| Input Wiring | 24V DC supply input |
| Output Connection | Integrated backplane bus |
| Installation Position | Left side of I/O rack |
6. Product Applications
The 1769-PB4 is widely used in DC-powered industrial automation systems requiring high-capacity distributed control.
Typical application fields:
- Industrial automation production lines
- Large machine control systems
- Packaging and assembly equipment
- Conveyor and logistics systems
- Water treatment systems
- Process control systems
- Offshore and marine automation
- Remote DC-powered installations
Functional role:
- Main DC power backbone for Compact I/O racks
- Supplies both logic and field power
- Supports larger modular I/O configurations
- Enables stable DC-only automation architectures
7. Product Advantages
7.1 High Power Capacity
Provides stronger output capability compared to lower-rated DC power modules, suitable for larger I/O systems.
7.2 DC System Compatibility
Optimized for 24V DC industrial environments without requiring AC infrastructure.
7.3 Stable Dual Output Design
Simultaneous 5V logic and 24V field power improves system integration.
7.4 Strong Electrical Isolation
Reinforced insulation improves safety and reduces noise interference.
7.5 Scalable Architecture Support
Supports up to 16 modules, enabling flexible system expansion.
7.6 Industrial Reliability
Designed for continuous operation in harsh industrial environments with voltage fluctuation tolerance.
8. Recommended Models (Same Series / Related Modules)
8.1 Same Series / Closely Related Modules
| Model | Description | Key Parameters |
|---|---|---|
| 1769-PB2 | Lower capacity DC power supply | 2A/0.8A output |
| 1769-PA4 | AC input high-capacity power supply | 4A/2A output |
| 1769-PA2 | Compact AC power supply | 2A/0.8A output |
| 1769-OW16 | Relay output module | 16-channel AC/DC switching |
| 1769-OF8C | Analog output module | 8-channel 4–20 mA output |
9. Recommended Models (Same Brand – Popular Modules)
| Model | Type | Key Parameters |
|---|---|---|
| 1769-L24ER | PLC Controller | Integrated CPU, Ethernet communication |
| 1769-L33ER | PLC Controller | High-performance processor, motion control |
| 1769-IQ16 | Digital Input Module | 16-channel discrete input |
| 1769-OB32 | Digital Output Module | 32-channel transistor output |
| 1769-IF8 | Analog Input Module | 8-channel signal acquisition |
10. Summary
The 1769-PB4 is a high-capacity DC power supply module designed for Compact I/O systems requiring robust backplane power distribution in DC-powered industrial environments.
Its strong output capability, reinforced isolation, and scalable architecture support make it suitable for demanding automation systems with larger I/O configurations.