Allen-Bradley 1746-IA8 AC Digital Input Module

The Allen-Bradley 1746-IA8 is an eight-channel AC digital input module for the SLC 500 controller family. It provides eight discrete inputs that accept 100–120 VAC signals, feeding the corresponding digital inputs on the 1746 I/O backplane in an SLC 500 rack. The module uses an open-style terminal design to simplify field wiring of AC-powered devices such as switches, relays, and sensors. As a member of the 1746 I/O family, it installs in standard SLC 500 backplanes alongside other I/O modules and is addressed with the same discrete-input scheme used across the platform. Typical applications include machine automation and process control where binary AC signals must be monitored by a Rockwell Automation controller, including start/stop circuits, door interlocks, proximity sensors, and limit switches. With eight inputs, the 1746-IA8 offers scalable expansion for digital signaling while preserving controller scan efficiency through the I/O backplane.