Allen-Bradley X1771-IAD Circuit Board Assembly

Allen-Bradley X1771-IAD Circuit Board Assembly is a replacement backplane-side circuit board for the 1771-IAD digital input module in Allen-Bradley PLC-5 and SLC 500 systems. As part of the 1771 I/O family, it is used to repair or refurbish a failed 1771-IAD module while preserving its 16-point digital input functionality. The assembly mounts in a standard 1771 universal I/O chassis and connects to the backplane via the module’s edge connector, preserving the original electrical interfaces and signal routing so field devices like sensors can be read by the PLC without reconfiguration. Typical applications include manufacturing automation and process control environments that rely on reliable digital inputs; before installation, confirm compatibility with your chassis and ensure the replacement part matches the original revision and connector layout.