Reference channel for the frequency measurement and power/energy measurement

In the EL34x3 all 3 channels are always selected independently of one another as reference for the frequency measurement or power/energy measurement. In order to avoid an error message from the terminal, the channels that are not in use should be deactivated.
The correct channels can be selected with the help of the predefined PDOs. Beyond that individual phases can be switched on or off with the help of the Command Object (index 0xFB00:01).