Allen-Bradley 1771-IGD Eight Point Digital Input Module

Allen-Bradley 1771-IGD Eight Point Digital Input Module is a digital input card from the 1771 I/O family designed to install in an Allen-Bradley 1771 I/O rack. It provides eight discrete input points that feed the PLC with the on/off status of field devices such as sensors, limit switches, or pushbuttons. This unit is Rev. A01 and dated 1999, reflecting its place in the late‑1990s AB hardware lineage. Use it to expand a controller’s ability to monitor eight digital signals within a compact I/O footprint and to interface with a standard 1771 bus backplane for real-time input status processing. Typical applications include machine controls, line monitoring, safety interlocks, and other automation tasks where eight digital inputs are sufficient. As part of the legacy 1771 I/O family, it supports integration into compatible AB control systems and retains the familiar rack-based modular approach for expanding I/O without analog conditioning or extra interfaces.