The 1756‑PB72 is a ControlLogix® DC power supply module from Allen-Bradley that provides the necessary regulated voltages to power a ControlLogix PLC chassis and its modules. It accepts a 24 V DC input and distributes multiple DC output voltages for backplane logic and I/O device operation, making it essential for stable automation system performance. Technical Details Specification Details Manufacturer Allen-Bradley (Rockwell Automation) Product Line ControlLogix® Power Supplies Model / Part No. 1756-PB72 Module Type DC Power Supply for PLC chassis Input Voltage 18 – 32 V DC (nominal 24 V DC) Input Power (Max) ~95 W Output Power (Max) ~75 W @ 0 – 60 °C Output Voltages & Currents • 5.1 V DC @ ~10 A• 3.3 V DC @ ~4 A• 1.2 V DC @ ~1.5 A• 24 V DC @ ~2.8 A Hold-Up Time ~35 ms @ 18 V DC; ~40 ms @ 24 V DC Isolation ~250 V continuous (power input to backplane) Operating Temp. Range 0 °C – 60 °C Storage Temp. Range -40 °C – 85 °C Mounting Left-end installation in 1756 chassis Dimensions (Approx) ~140 × 112 × 145 mm (5.5 × 4.4 × 5.7 in) Weight (Approx) ~0.95 kg (2.1 lb) Status Active industrial PLC power supply Typical Application Provides DC power for ControlLogix backplane and modules