Do you need to control an appliance with 230 V power supply? It can be easily solved with Quido I/O modul, a brief HOWTO follows below:
Quido outputs need to be amplified with an external relay or contactor, if it is necesasry to switch higher voltage, e. g. 230 V or even higher.
Connect everything according to the following pictures::
Wiring diagram for Quido and 230 V power relay
Example of connection with 230 V power relay