i am runing a variable frequency drive and some contactors from a mega. One time a motor gets supplied from mains directly and once from the VDF via two contactors. The contactors are switched by the mega.
always when the motor gets swiched on from the mains contactor, the w5100 looses communication (green and orange LED at RJ45 connector goes off) and IP address is not accessible for a two to three seconds) after this the connection recovers and the values i send via ethernet are back.
I have tried a short test by laying the ethernet cable apart from the rest of the cables. Then the phenomena occures not always. So i guess the ethernet shield is a bit sensitive to EMV.
My question is, can i restart the ethernet server via the mega somehow?