Allen-Bradley 1756-PA75/B Industrial Power Supply Module Full Technical Report
Product Overview
The Allen Bradley 1756-PA75/B is an industrial-grade AC power supply module designed for ControlLogix automation systems. It is used to provide stable backplane power for PLC chassis, ensuring continuous operation of controllers, communication modules, and I/O systems in large-scale automation environments.
This model belongs to the ControlLogix power supply family (Series B revision) and is widely applied in industrial automation systems that require high reliability, stable voltage output, and long-term continuous operation.
The “/B” revision indicates an updated hardware generation with improved compatibility and refined internal electrical design compared with earlier revisions. It is commonly used in heavy-duty industrial environments such as manufacturing plants, energy systems, and process automation lines.
Brand Information
The product belongs to the globally recognized industrial automation ecosystem known for PLC systems, motion control platforms, and industrial communication solutions.
It is widely used in:
- Industrial automation control systems
- Smart manufacturing platforms
- Distributed control systems (DCS)
- High-speed production lines
- Safety and process control environments
The brand is known for:
- High system stability
- Strong industrial compatibility
- Long operational lifespan
- Advanced automation integration
- Reliable global deployment
Product Series
ControlLogix Series
The 1756-PA75/B belongs to the ControlLogix modular PLC platform, which is designed for high-performance automation applications.
Key characteristics of the series include:
- Fully modular architecture
- Scalable system configuration
- High-speed industrial communication
- Multi-controller coordination capability
- Support for redundancy systems
- Strong distributed control capability
The system supports integration of:
- CPU modules
- I/O modules
- Communication modules
- Motion control modules
- Safety control modules
- Power supply modules
The 1756-PA75/B plays a key role by supplying stable system power to the entire chassis backplane.
Technical Parameters
Main Specification Table
| Parameter |
Specification |
| Model |
1756-PA75/B |
| Product Type |
AC Power Supply Module |
| Series |
ControlLogix |
| Hardware Revision |
Series B |
| Input Voltage Range |
85–265V AC |
| Nominal Input |
120 / 240V AC |
| Frequency Range |
47–63 Hz |
| Input Power |
100 VA / 100 W |
| Maximum Output Power |
75 W |
| Backplane Current (1.2V) |
1.5 A |
| Backplane Current (3.3V) |
4.0 A |
| Backplane Current (5V) |
13 A |
| Backplane Current (24V) |
2.8 A |
| Isolation Voltage |
250V continuous |
| Inrush Current |
30 A max |
| Operating Temperature |
0°C to 60°C |
| Storage Temperature |
-40°C to 85°C |
| Humidity |
5%–95% non-condensing |
| Mounting Method |
Chassis left-side installation |
| Cooling Method |
Natural convection |
| Protection Level |
Industrial EMC protection |
| Dimensions |
14.5 × 14.0 × 13.5 cm |
| Weight kg（ ） |
0.96 kg – 1.10 kg |
Product Introduction
The 1756-PA75/B is designed to ensure stable electrical distribution across the ControlLogix chassis. It converts incoming AC power into regulated DC backplane power used by all installed modules.
It is commonly installed in systems requiring:
- Continuous 24/7 operation
- High I/O density control systems
- Large-scale automation networks
- Critical industrial production lines
Its design focuses on stability, efficiency, and compatibility with complex industrial environments.
Product Applications
Manufacturing Industry
Used in automated production systems such as:
- Assembly lines
- Robotic welding systems
- Packaging machinery
- Conveyor control systems
Energy Industry
Common in:
- Power generation systems
- Substation control systems
- Renewable energy monitoring
- Electrical distribution automation
Oil & Gas Industry
Used in harsh environments such as:
- Pipeline monitoring systems
- Refinery automation
- Offshore control systems
- SCADA infrastructure
Food & Beverage Industry
Applied in:
- Filling machines
- Labeling systems
- Processing automation
- Packaging control lines
Semiconductor Industry
Used in high-precision systems such as:
- Wafer handling
- Cleanroom automation
- Precision motion systems
- Inspection equipment
Product Advantages
1. Stable Industrial Power Output
Provides consistent backplane voltage ensuring reliable system operation.
2. High Reliability Design
Built for continuous operation in harsh industrial environments.
3. Strong Compatibility
Works seamlessly with all ControlLogix chassis modules.
4. Reduced Downtime
Stable power delivery minimizes system failure risks.
5. Long Service Life
Industrial-grade components ensure extended operational lifespan.
6. Strong Anti-Interference Capability
Resistant to electrical noise from industrial equipment.
Recommended Models (Same Series / Related)
Related ControlLogix Power & Chassis Modules
| Attribute |
1756-PA75/B |
1756-PA72 |
1756-PB75 |
1756-PB72 |
1756-PSCA2 |
| Input Type |
AC |
AC |
DC |
DC |
N/A |
| Input Voltage |
85–265V |
85–265V |
18–32V |
18–32V |
N/A |
| Output Power |
75 W |
75 W |
75 W |
75 W |
N/A |
| Backplane Current |
13A / 5V |
13A / 5V |
13A / 5V |
13A / 5V |
N/A |
| Dimensions |
14.5×14.0×13.5 cm |
14.5×14.0×13.2 cm |
14.5×14.0×13.5 cm |
14.5×14.0×13.2 cm |
13×12×6 cm |
| Weight kg（ ） |
0.96–1.10 kg |
1.45 kg |
1.55 kg |
1.40 kg |
0.85 kg |
Recommended Popular Models (Same Brand)
Widely Used Industrial Automation Modules
| Attribute |
1756-L85E |
1756-EN2TR |
1769-L36ERM |
1734-AENTR |
5069-L320ER |
| Function |
PLC CPU |
Ethernet communication |
Compact controller |
Remote I/O adapter |
Advanced compact PLC |
| Network |
EtherNet/IP |
EtherNet/IP |
Ethernet |
EtherNet/IP |
EtherNet/IP |
| Processing |
High speed |
Communication only |
Medium-high |
I/O gateway |
High performance |
| Dimensions |
15×14×13 cm |
13×14×12 cm |
15×11×10 cm |
7×7×7 cm |
13×10×9 cm |
| Weight kg（ ） |
0.65 kg |
0.48 kg |
0.75 kg |
0.20 kg |
0.54 kg |
Installation Notes
The module is installed on the left side of the ControlLogix chassis and must be properly aligned with the backplane connector.
Key installation considerations:
- Ensure correct chassis compatibility
- Maintain proper ventilation spacing
- Avoid high-vibration mounting positions when possible
- Confirm correct input voltage range before power-up
Maintenance Characteristics
- Modular replacement design
- Simple fault diagnosis
- Low maintenance requirement
- Long service interval
- Stable field performance
Conclusion
The 1756-PA75/B is a reliable industrial AC power supply module designed for demanding ControlLogix automation systems. Its strong stability, industrial durability, and excellent compatibility make it suitable for complex automation environments requiring continuous operation and high system reliability.
It remains a core power component in modern industrial control architectures where uptime and system stability are critical.
