The Allen-Bradley 1794-IB16D module is a FLEX I/O digital input module that features advanced diagnostics, enabling precise monitoring of field devices by identifying issues like open or shorted connections and power supply problems. Designed to enhance efficiency, this modular unit integrates seamlessly into the FLEX I/O system, reducing setup and error-correction time significantly. With dimensions of 45.7 x 94 x 53.3 millimeters, it can be mounted on either a 1794-TB32 or 1794-TB32S terminal base, and it comes equipped with 33 indicator lights, including diagnostic and status indicators for comprehensive system monitoring.