The Allen-Bradley 1756-PB75 is a ControlLogix power supply, specifically designed to provide regulated voltages for modules within a ControlLogix chassis. It ensures system stability and enables an orderly shutdown during power failures. The 1756-PB75 is externally powered by an 18-32VDC input, with a nominal input of 24VDC. It delivers 75W of output power at 60°C, with specific current outputs of 1.5A at 1.2VDC, 4A at 3.3VDC, 13A at 5.1VDC, and 2.8A at 24VDC. The module is typically installed on the left side of the ControlLogix chassis.