Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 1756‑PA72K |
| Manufacturer | Allen‑Bradley (Rockwell Automation) |
| Product Type | ControlLogix AC Power Supply Module |
| Input Voltage Range | 85 to 265 VAC (Auto‑ranging) |
| Input Frequency | 47 to 63 Hz |
| Maximum Input Power | 100 VA |
| Maximum Output Power | 75 W (at 60 °C) |
| Output Voltage / Current | 5.1 VDC @ 10 A, 3.3 VDC @ 4 A, 1.2 VDC @ 1.5 A, 24 VDC @ 2.8 A |
| Hold‑up Time | 20 ms typical (5–6 cycles at 50/60 Hz) |
| Inrush Current | 20 A maximum |
| Operating Temperature | 0 to 60 °C (32 to 140 °F) |
| Storage Temperature | -40 to 85 °C (-40 to 185 °F) |
| Relative Humidity | 5 to 95% (non‑condensing) |
| Dimensions (H x W x D) | 140 x 112 x 145 mm (5.51 x 4.41 x 5.71 in) |
| Weight | 0.95 kg (2.1 lb) |
Main Features and Advantages
Universal Input Voltage: The 1756‑PA72K eliminates the need for external transformers or voltage selectors by accepting any AC input from 85 to 265 VAC. This wide range allows the same module to be deployed across different geographic regions and electrical infrastructures without hardware modification, significantly simplifying spare parts inventory and system commissioning.Robust Power Delivery: With a total output capacity of 75 watts, the module provides four independent DC voltage rails to the backplane. The primary 5.1 VDC output can deliver up to 10 amps to support high‑density I/O configurations and processor loads. Built‑in overcurrent, overvoltage, and thermal protection circuits safeguard both the power supply and the expensive downstream modules from electrical faults, ensuring system integrity.Industrial Durability: Designed for harsh environments, the 1756‑PA72K features a conformal coating on its printed circuit board that protects against moisture, dust, and corrosive atmospheres commonly found in chemical, food processing, and maritime applications. Its high MTBF (Mean Time Between Failures) and compliance with industrial vibration and shock standards make it suitable for continuous operation in demanding manufacturing and process control settings.
Application Field
The 1756‑PA72K is the primary power source for standard ControlLogix automation racks across a wide spectrum of industries. In automotive manufacturing, it powers controllers and I/O modules on assembly lines and robotic welding cells, where consistent voltage is critical for motion control and sensor networks. Within the oil and gas sector, it provides reliable power for wellhead control panels and compressor station PLCs, operating effectively despite voltage sags and surges common in remote field locations. The module is also extensively used in water and wastewater treatment facilities to energize pump control logic and SCADA interface modules, leveraging its immunity to humid and corrosive environments. Additionally, its global voltage compatibility makes it ideal for original equipment manufacturer (OEM) machinery destined for export to international markets with varying electrical standards.
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