Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 1756-PA72/B |
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Product Type | AC Power Supply Module |
| Input Voltage Range | 85 to 265 VAC (47–63 Hz) |
| Nominal Input Power | 100 VA / 100 W |
| Main Output Voltage/Current | 5.1 VDC @ 10 A (Continuous) |
| Auxiliary Outputs | 3.3 VDC @ 4 A; 1.2 VDC @ 1.5 A; 24 VDC @ 2.8 A |
| Maximum Output Power | 75 W (within 0 to 60°C operating range) |
| Power Dissipation | Approx. 25 W |
| Operating Temperature | 0 to 60 °C (32 to 140 °F) |
| Hold-up Time | 5 cycles @ 85V AC; 6 cycles @ 120/240V AC |
| Cooling Method | Convection cooling (fanless) |
| Redundancy Support | No (requires specific redundant models for dual-power setups) |
Main Features and Advantages
The Allen-Bradley 1756-PA72/B delivers robust performance through its universal input voltage capability, accepting any voltage from 85 to 265 VAC without the need for manual taps or jumpers. This wide range simplifies inventory management and allows the same power supply to be deployed globally across facilities with varying electrical infrastructures. A key strength lies in its multi-rail output design; the 1756-PA72/B provides not only the critical 5.1V DC backbone for the backplane but also dedicated 3.3V, 1.2V, and 24V DC rails to support a diverse mix of modern digital and interface modules within the chassis.Reliability is engineered into the module with built-in protection against overcurrent, overvoltage, and overtemperature conditions, safeguarding both the power supply itself and the expensive ControlLogix modules downstream. The 1756-PA72/B features clear status indication via front-panel LEDs (AC OK, DC OK, FAULT), enabling maintenance personnel to quickly diagnose power health at a glance. While this standard model does not support true hot-standby redundancy on its own, it forms the foundation for highly reliable single-path power systems in a wide array of industrial applications.
Application Field
The Allen-Bradley 1756-PA72/B is the cornerstone of standard ControlLogix systems across discrete manufacturing and process industries. In automotive assembly, packaging machinery, and material handling systems, it reliably powers chassis containing a combination of digital I/O, analog modules, and motion control interfaces, ensuring consistent logic solver operation. The module’s 75W capacity is well-suited for medium-density chassis configurations where a balance between module count and power headroom is required.In process control environments such as water treatment, chemical batching, and light industrial HVAC control, the 1756-PA72/B provides the clean, regulated power necessary for sensitive analog and communication modules. Its wide input voltage tolerance makes it particularly valuable in areas with unstable grid power or legacy electrical installations. For system integrators, the Allen-Bradley 1756-PA72/B offers a cost-effective and versatile power solution for main control panels, remote I/O racks, and standalone machine controllers that do not require the higher cost or complexity of redundant power architectures.
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