The Siemens SM 1221 PLC digital expansion module is a 16 integrated digital input device. It is designed to use with S7-1200 series PLCs. The I/Os can be connected with both sink and source configurations. It has advanced features like alarms and diagnostics that make it an ideal choice for various applications.
SIMATIC S7-1200, Digital inputs SM 1221, 16 digital inputs, 24 V DC