Allen-Bradley 1746-IG16 is a 16-channel TTL digital input module for the SLC 500 system that provides sourcing 5 V TTL inputs. Each input channel draws a nominal 3.7 mA at 5 V, enabling 16 discrete digital signals—such as pushbuttons, limit switches, or other 5 V logic devices—to be read by the SLC 500 CPU when the module sits in a 1746 I/O chassis. As part of the SLC 500 modular I/O family, the 1746-IG16 installs in a backplane slot and communicates with the controller through the standard SLC backplane protocol, delivering a compact expansion for digital input points in legacy Rockwell Automation installations.
