What is the consequence of violation of probation of a felon for the second time?

That would depend on what the violation is and what the probation department and court thinks. Would you mind providing a little more information as to what the felony was about for which the person is on probation and also the violation of probation that was committed, please. Some things that a person might think would be a violation of probation may not really be severe enough to violate probation.