Allen-Bradley 1772-SD2 is a Rockwell Automation 1772-series I/O module. It functions as a remote I/O device on a 1772 bus, enabling data exchange between a compatible PLC controller and field devices on the serial I/O network. The part number 1772-SD2 identifies this specific module within the 1772 family, suitable for projects that require expansion of I/O points through the 1772 interface.
