Allen-Bradley 1746-IB16 Sixteen Channel Digital Input Module

Allen-Bradley 1746-IB16 is a 16-channel digital input module for the SLC 500 PLC system, delivering 16 sinking 24V DC input points that share a single common terminal. Each channel accepts a 10–30V DC signal and is wired for sinking inputs, making it compatible with standard industrial sensors and switches. The module plugs into a 1746 I/O backplane, expanding the controller’s discrete input count and enabling straightforward wiring with a common return. Typical applications include machine status monitoring, start/stop signals, limit switches, and safety interlocks in mid‑range automation environments. The 1746-IB16 is a 16‑channel DC input card with a nominal 24V DC input level and a response time specified around 8 milliseconds for an input state change. With 16 inputs per common, it supports scalable expansion within a single chassis while maintaining compatibility with Rockwell’s 1746 backplane and software ecosystem.