The Allen-Bradley 1756-PB75R is a 24V DC redundant power supply for ControlLogix systems. Delivering 75W of power, it supports automatic load sharing and seamless failover to maximize uptime in critical PLC applications. It features 20ms hold-up time and ATEX/IECEx hazardous location certifications.
The Allen-Bradley 1756-PB75R serves as a high-availability power solution for ControlLogix® systems. This module specifically provides a redundant power architecture that safeguards industrial processes against unexpected hardware failures. By utilizing two 1756-PB75R units in conjunction with a 1756-PSCA2 chassis adapter, the system achieves automatic load sharing. This configuration ensures that if one power supply fails, the secondary unit immediately assumes the full electrical load without interrupting the programmable logic controller (PLC) operations.
Input versatility is a core feature of the 1756-PB75R, as it accepts a wide DC voltage range from 18V to 32V (24V nominal). This makes it ideal for sites powered by industrial battery banks or 24V DC distribution networks. The module delivers 75 Watts of power at 60 °C, distributing current across the 1.2V, 3.3V, 5.1V, and 24V DC backplane rails required by ControlLogix I/O and processor modules.
Reliability in harsh environments is reinforced by the module’s 250V continuous isolation rating and a 20-millisecond hold-up time. This hold-up capacity allows the system to ride through minor voltage dips without triggering a CPU reset. For maintenance and safety, the front panel includes clear status indicators. Furthermore, the unit carries ATEX and IECEx certifications, permitting its use in hazardous locations where explosive atmospheres may be present.
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