ST-121F
The ST-121F is a digital input module manufactured by Kollmorgen in the Crevis Slice Modules series. It features 16 digital inputs of sink type (positive logic) and supports an on-state voltage of 12/24 VDC (10.2 6 628.8 V) with a maximum off-state voltage of 5 VDC. Nominal input impedance is 5.1 k 9 9Ω. Measuring 12 mm x 99 mm x 70 mm, it mounts on a 35 mm DIN rail.