Siemens 6ES7422-1HH00-0AA0 Analog Input Module

The Siemens 6ES7422-1HH00-0AA0 is a SIMATIC S7-400 digital output module (SM 422) that provides 16 isolated relay outputs for switching field devices from the PLC. Each of the 16 channels uses a relay contact rated up to 5 A at 230 V AC, enabling reliable control of solenoids, contactors, valves, or other 230 VAC loads in industrial automation applications. The module offers galvanic isolation between the logic side and the output circuits, helping protect the CPU and surrounding electronics from transients and wiring faults. Designed for integration with the SIMATIC S7-400 backplane, it plugs into the same I/O rack family as other SM modules and works in concert with Siemens programming and diagnostics workflows. Common applications include factory automation, machine control, and process systems where discrete 230 VAC outputs are required, such as driving actuators or signaling devices. The 6ES7422-1HH00-0AA0 is specified for 230 VAC operation with 16 relay outputs, delivering robust, well-isolated control for demanding industrial environments where modular I/O expansion is needed.