Allen-Bradley 1746-IG16 16-Point DC Input Module

Allen-Bradley 1746-IG16 is a 16-point digital DC input module for the SLC 500 family that reads TTL-level 5 V signals from sensors and switches. This sourcing-type module accepts 5 V DC TTL inputs with an operating range of 4.5–5.5 V DC and an off-state threshold of 2.0–5.5 V DC, with each point drawing about 3.7 mA at 5 V and a backplane current of roughly 140 mA for the entire module. The 16 inputs are designed to be wired to a common in a Rockwell Automation backplane, providing a compact, high-density interface for digital devices in legacy automation systems. Typical installation literature and datasheets consistently describe 1746-IG16 as a 16-point TTL input module (5 V) that supports sourcing inputs, making it suitable for reading discrete signals from pushbuttons, limit switches, and other TTL-compatible sensors in SLC 500 racks.