The Allen-Bradley 1746-IB32 is a 32-point DC digital input module for the SLC 500 system, providing 32 sinking 24 VDC inputs. It uses two input words on the backplane to present all 32 discrete inputs to the controller. Typical field wiring involves connecting 24 VDC devices such as pushbuttons, limit switches, or proximity sensors to +24 V and letting the module sink the current. Designed to fit in a 1746 I/O rack with a compatible 24 VDC supply and SLC 500 controller, the 1746-IB32 expands digital input capability without changing the existing control architecture.
