Allen-Bradley 1756-IB16 ControlLogix Digital Input Module Allen-Bradley 1756-IB16 ControlLogix Input Module, 10-31 VDC, 16 Points (20 Pin). Number of Inputs: 16; Voltage, On-State Input, Nom: 12/24V DC; Operating Voltage: 10-31.2V DC; 1756-IB16 ControlLogix Input Module can be used with 1756-TBNH or 1756-TBSH Removable Terminal Block Housing.