The Siemens 6AG1223-1BH30-4XB0 is a SIPLUS S7-1200 digital I/O module – 8 inputs and 8 outputs, 24 V DC. It's the ruggedized variant that handles -40 to 70 °C ambient, so it's a go-to for freezer floors, hot conveyor tunnels, or outdoor cabinets. Lifecycle is current, meaning you can keep it on the shelf as a critical spare without worrying about last-time-buy deadlines.
The temperature range is the reason to pick this over the standard version: -40 °C min and 70 °C max, so no derating in extreme environments. Input thresholds are standard S7-1200: signal "1" at 15 V DC, 2.5 mA; signal "0" below 5 V DC at 1 mA. Outputs handle a lamp load up to 5 W, and diagnostics are built in – alarm and status bits come standard, parameterizable for your fault-isolation needs. Power draw is a typical 2.5 W, and the module requires an external front connector (not included).
Covers the bases for industrial approvals: cULus for North American panels, CE mark for European machinery, and FM approval for hazardous locations (non-incendive). IP20 enclosure means it lives inside a cabinet. No short-circuit protection onboard – provide external per-line fusing or electronic protection, as per Siemens guidelines.