I have changed locations of two Danfoss VLT FC-301, and changed the address node for each one. Both are connected with profidrive card to the PLC system. When running one of the two VLTs a warning "Field Bus Fault [W34]" Appears on both VLTs and cause stopping of the operation. I turned off the other VLT and run the first one, it works well just in case the other one is off or the Profibus cable is removed from its slot.
Any advise for this case?

 

Long shot - I have found that sometimes the Ethernet switch needs to be powered cycled to recognize the change in IP addressing for any given port. Again, it's a long shot.