A-B Allen-Bradley

Model: 1756-PA72

Full Name: ControlLogix AC Power Supply Module

Brand: Allen‑Bradley (Rockwell Automation)

Applicable System: ControlLogix 5000 Chassis Series

The 1756-PA72 is an AC input power supply module exclusively designed for ControlLogix modular PLC chassis, serving as the central power source for all backplane modules. Its key functions are as follows:

1. Centralized DC Power Supply for Entire Chassis Mounted in the leftmost slot of the ControlLogix rack, it receives industrial AC mains and converts it into multiple stabilized DC voltages (5V DC, 24V DC, etc.) via internal rectifier, voltage regulation and filtering circuits. It supplies power to all backplane-installed modules including CPUs, communication cards, digital/analog I/O modules and motion modules, acting as the power core of the whole PLC system.
2. Wide-Range AC Input for Global Industrial Power Grids It accepts universal single-phase AC input from 85 VAC to 264 VAC, compatible with 110V, 220V, 240V factory power supplies worldwide. No extra step-down transformer is required for domestic 220V or overseas 110V workshop power.
3. Standard Power Rating for Full-Size ControlLogix Racks This standard-capacity power supply supports a complete 13-slot ControlLogix chassis. It can drive a full set of equipment including 1756-L73 controllers, multiple EtherNet/IP & ControlNet communication modules and abundant I/O modules, covering power consumption requirements of medium and small automation machinery.
4. Multi-Layer Hardware Protection Against Electrical Failures Built-in protection circuits trigger automatic output shutdown and fault latch upon backplane short circuit, module overload, abnormal input voltage or internal overheating. This prevents permanent damage to high-value components such as CPUs and I/O cards. Front panel status LEDs clearly indicate normal operation, fault or power loss for rapid troubleshooting.
5. Isolation & EMC Filtering to Suppress Industrial Interference Integrated high-voltage isolation and EMC filter circuits suppress grid surges and harmonic noise generated by inverters and motors. It avoids PLC program loss, communication disconnection and false I/O triggering caused by voltage fluctuation and pulse interference, ensuring stable continuous production.
6. Hot-Swappable Modular Design for Easy On-Site Maintenance It adopts standard rack pluggable structure (replaceable when power is off). In case of power failure, only the faulty supply module needs replacement without removing other CPU or I/O cards inside the rack, significantly cutting equipment downtime during maintenance.
7. Rugged Industrial Certifications for Harsh Working Conditions Certified by UL and CE standards and qualified for Class I Division 2 hazardous locations. With wide operating temperature range, it is widely used in metallurgy, water treatment, oil & gas, packaging, automotive assembly lines and other dusty, vibrating or unstable power industrial sites.

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