Allen-Bradley 1771-IA USNTC01 Programmable Logic Controller

Allen-Bradley 1771-IA USNTC01 is an 8-point digital input module from the 1771-IA family, designed for use in legacy PLC-5 and SLC 500 backplanes. This Series C card accepts 120 V AC or DC input signals and provides reliable digital state feedback to the controller, making it well-suited for wiring sensors, limit switches, and other on/off devices in automation lines. The module draws up to 75 mA at 120 V and is intended for use with 1771 I/O racks, where it plugs into the standard backplane to extend the controller’s input capability; typical applications include conveying systems, packaging lines, and machine safety interlocks. As a genuine Allen-Bradley part cataloged as 1771-IA, it integrates with existing 1771 backplanes and supports the broad ecosystem of 1771 I/O modules.