I have an issue where the high voltage appears to be inducing noise on my 24vdc to power the JAZZ 2. I am going to scope it next week to see how bad the noise is. The noise is very apparent when a frequency drive starts because I lose the USB connection and can not re-establish it. Today, I tried adding a ferrite ring to the incoming power and it appears to be night a day. When its not installed I have an issue when it is there, no problem. Has anyone else added a ring to their setup to cut down on noise or found connection issues with the USB port? Also, a wild question could too much noise cause a glitch in the PLC program? Every so often the PLC misses a math function from a positive transition. Any thoughts?