Rockwell 1756-IB16D 12/24 V DC Sink ControlLogix Digital Input Module. Operating voltage 10 to 30V DC, 16 diagnostic inputs (4 points/group). Total backplane power 0.84W, off-state voltage max. 5V, on-state current max. 13mA @ 30V AC, and an inrush current max. 250mA.