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The Siemens 6AG1223-0BD30-4XB0 is a digital input/output module for the S7-1200 system, designed for extreme temperature environments with a rated range of -40 to 70 °C. Packaged in the SIPLUS variant, it carries 2 current-sinking digital inputs (24 V DC) and 2 solid-state digital outputs (0.5 A each). Switching is fast—2 µs on and 10 µs off—and the module supports parameterisable inputs, diagnostics, and alarms. Power loss is a lean 1 W typical, and the module draws 4 mA per channel from the backplane bus at 5 V DC.