2 inputs, 2 outputs, 24 V DC — SIPLUS extended range
The Siemens 6AG1223-3BD30-5XB0 is a SIPLUS digital I/O module with 2 digital inputs and 2 digital outputs, rated for 24 V DC supply. Each input accepts a signal "1" from +15 to +30 V, drawing typically 14 mA per channel, with a 2.5 µs max transition from 0 to 1. The two outputs switch resistive loads up to 0.1 A per channel.
The -40 °C to 70 °C range means this module lives in unheated cabinets, freezer tunnels, or desert solar arrays — the standard 0–60 °C SIMATIC part won't survive there. The 24 V DC input supply is typical for control panels, but the 1 W typical power loss keeps the heat load low inside a sealed enclosure. Inputs are parameterizable and include diagnostics, status indication per channel, and alarms. The 0.1 V max for signal "0" with a 10 kΩ load gives clean noise immunity — a 5 V threshold for "0" means the input won't false-trigger on leaky proximity sensors. Outputs are not short-circuit protected — the load circuit needs an external fuse or electronic breaker. The 0.1 A per channel limit suits small pilot lights, solenoid valves, or signal lamps, not contactor coils. Unshielded cable runs up to 150 m, shielded up to 500 m — plenty for distributed I/O in a production hall. The module also carries Type 1 protection against fouling per EN 60664-3, meaning it tolerates conductive dust without conformal coating.