The Siemens SM 1223 PLC digital expansion module is an 8 input and 8 relay output with a contact rating of 500mA device. It is designed for use with S7-1200 series PLCs. The I/Os can be connected with both sink and source configurations. It has many advanced features like alarms, diagnostics and galvanic isolation between the channels and the backplane bus, which make it ideal for various digital applications.
SIMATIC S7-1200, Digital input/output SM 1223, 8 digital inputs 24 V DC, 8 digital outputs, Transistor 0.5A