Siemens 6ES7 222-1HF21-0XA0 Relay Output Module

Siemens 6ES7 222-1HF21-0XA0 Relay Output Module is the EM222 eight-channel relay output expansion for the SIMATIC S7-200 family. It provides eight independent relay contacts (Q1.0–Q1.7) that are driven by the S7-200 CPU to switch external circuits while isolating the load side from the controller. This module is designed to extend the number of controllable loads in compact automation projects, enabling direct switching of external devices such as relays, solenoids, lamps, valves, or small motors through the PLC. The part is Siemens 6ES7 222-1HF21-0XA0 and is commonly listed as EM222 Relay Output; it is compatible with S7-200 processors and serves as an expansion to the core CPU for increased I/O capability. Ambient operating temperature is listed up to 40°C in Siemens documentation for the EM222 relay output module, and wiring is carried via dedicated terminals for each relay output to simplify installation and maintenance.