text: <s>[INST] PowerFlex 700 F85 Port 5 DPI Loss Hello,I am having difficulties with a ControlLogic PLC controlling two PowerFlex drives using Devicenet. Their are two drives, one on and one as a hot standby. Every 4 or 5 hours the active drive faults (code F85), but not the standby. Not sure what the problem is. Any suggestions? Could it be the devicenet cable (I am not sure the cable is a Devicenet cable)? If so why is it only on the running drive, and why is it only periodically?Could it be a power issue? Also, I have set Parameter 10 and 11 to run on Last value but this does not stop the problem. Please help. Background information:drive is: PowerFlex 700 VC 480V 77A [8040] rev 4.010 The communication card is 1756-DNB rev 10.004 The controller is 1756-L63 ver 17 [/INST] It could be related to noise problem...try to take a look to the following thread and indicated suggestions: http://forums.rockwellautomation.com/rockwell/board/message?board.id=Drives&message.id=921#M921 About ferrite cores, see the Installation Instructions ... this document is for PF700s, but is similar for PF700 VC. Hope this helps… - fuzzy logic \\n </s>