Allen-Bradley 1771-IAD is a 16-point digital input module for the PLC‑5 1771 I/O system, delivering 16 discrete inputs to the controller from field sensors and switches. This AC/DC input module accepts 120V AC or 125V DC signals, with a nominal input rating of 120V AC / 125V DC and a broad operating range of 79–138V for both AC and DC. It is designed for use in a PLC‑5 I/O chassis and commonly pairs with the 1771 wiring arm (1771-WH) to integrate with industrial automation installations.
