Allen-Bradley 1771-ID16 is a 16-channel isolated input module for PLC-5 systems that accepts 120 V AC field signals. Each input is galvanically isolated from the backplane to protect the PLC-5 controller from voltage spikes and electrical noise typical of 120 VAC devices. It installs in a 1771 I/O chassis and interfaces with the 1771 backplane, providing independent 120 VAC inputs for sensing switches, sensors, and other field devices. The 1771-ID16 designation identifies this 16-point 120 VAC isolated input module within the 1771 I/O family.
