Description

Brief Product Description

The Allen Bradley 1756-PA72 is a high-performance AC power supply module designed to provide regulated DC power to the backplane of a ControlLogix chassis. It ensures stable operation for controllers, I/O modules, and communication interfaces by converting universal AC input into multiple precise DC voltage rails.

​Product Description

Reliable Power Distribution for Automation

The Allen Bradley 1756-PA72 serves as the primary energy source for ControlLogix hardware, mounting directly to the left side of any 1756 chassis. This module accepts a wide universal input range of 85 to 265V AC, allowing it to function globally across different electrical standards without manual switching. By providing four distinct DC output voltages—5.1V, 3.3V, 1.2V, and 24V—it powers the diverse logic and analog components required for complex PLC tasks.¹ The 75-watt total capacity effectively supports high-density I/O configurations and high-performance processing modules within a single rack.

Diagnostic Monitoring and System Safety

Rockwell Automation integrated several protective features into the 1756-PA72 to enhance system uptime and hardware longevity.² An onboard status LED provides immediate visual confirmation of the power supply health, which simplifies troubleshooting during commissioning or maintenance. Furthermore, the module includes a specific hold-up time capability.³ This feature provides a crucial buffer during brief power dips, allowing the ControlLogix processor to perform orderly data saves and system shutdowns. This proactive approach prevents data corruption and protects the structural integrity of the automation program.

Industrial Compliance and Structural Design

The 1756-PA72 features an open-style enclosure designed for optimal heat dissipation within an industrial cabinet. It operates efficiently in environments reaching up to 60°C (140°F), ensuring consistent performance in demanding factory floor conditions.⁴ Because it carries certifications such as UL, CSA, CE, and C-Tick, engineers can confidently specify this power supply for international projects requiring strict adherence to safety and quality regulations. Its robust vibration and shock resistance ratings further cement its position as a dependable solution for heavy-duty industrial applications.

Technical Specification Table