The Allen-Bradley 1746-IA16 is a robust 16-point AC digital input module designed for the SLC 500 series of programmable logic controllers. This module serves as a critical interface between the PLC processor and external AC input devices such as push buttons, limit switches, and sensors. It reliably detects and converts 120V AC input signals into logic levels that the SLC 500 controller can process. Engineered for demanding industrial environments, the 1746-IA16 provides high-density input capability in a single slot, making it an efficient solution for expanding system monitoring and control functions.