A relay contact is located at the connector X2 of the RevPi Connect.
You can use this according to your project, e.g. to interrupt the power supply of a connected hardware (e.g. RevPi DIO, Wireless Router…). Please note that the relay can switch a maximum of 30 V and 2 A!
The relay contact is closed after starting the device. But you can open and close it in the process image via the status byte RevPiLED, bit 6. You can find out how this works in principle in the section How to Use Status Bytes. In the section Status-Bytes on the RevPi the functions are described in more detail.
The relay can also be switched when the watchdog triggers a restart. This is explained in the chapter “Watchdog“.