The Allen-Bradley 1756 ControlLogix power supplies are specialized, high-efficiency power modules designed to provide regulated DC power directly to the ControlLogix chassis backplane. Unlike standard PLC systems where power supplies might occupy a standard I/O slot, 1756 power supplies mount uniquely onto a dedicated structural footprint on the far left side of the chassis, leaving all functional slots open for processors, communication bridges, and I/O cards.
We are not authorized by Allen-Bradley. All products come with a one year warranty.
Allen-Bradley 1756 ControlLogix Chassis & Power Supply Selection Guide
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ControlLogix power supplies convert incoming plant infrastructure power into regulated internal backplane voltages. Use this category overview to identify the proper electrical design for your system architecture.
| Supply Class | Features / Industrial Role | Common Catalog Codes |
|---|---|---|
| AC Power Supplies | Converts standard line-voltage plant power to regulated internal backplane channels. Features integrated overvoltage protection and a wide input tolerance. | 1756-PA72, 1756-PA75 |
| DC Power Supplies | Engineered to connect directly into low-voltage industrial battery banks or localized DC infrastructure loops for remote station operations. | 1756-PB72, 1756-PH72, 1756-PB75 |
1756 – PA72 — Standard AC Power Module
1756 – PB75 — High-Capacity DC Power Module
Backplane Amperage Tip: Always compute your total module current draw before finalizing your hardware footprint. While standard 1756-PA72 and high-capacity 1756-PA75 units share identical mounting brackets, selecting the PA75 provides significantly expanded 5V and 24V DC backplane amperage caps to prevent unexpected voltage sags when a rack is packed with analog or motion modules.
In manufacturing processing cells, power supplies are continuously subjected to thermal exhaustion and utility switching spikes. When an aging module fails or drops output levels below the required backplane voltage threshold, it can trigger system dropouts and data corruption faults across the entire rack. Locating a fast drop-in replacement is essential to restoring safe automated sequencing and protecting costly processing logic processors.
Whether you need a current-generation AC power module to pass a system upgrade inspection, or an obsolete, hard-to-find low-voltage DC supply to keep a standalone legacy remote rack functioning, TCI Supply can assist. We focus on tracking down factory-fresh components alongside certified surplus allocations to keep your control layouts operational.
Need an Exact 1756-PA72, 1756-PB72, or 1756-PA75 Component?
TCI Supply maintains an extensive inventory of active production power frames, legacy DC modules, and chassis balancing accessories. Contact our sales desk today for a competitive price quote and rapid worldwide delivery options to your plant floor.
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