Harperj Posted November 4, 2021 Report Share Posted November 4, 2021 Using a Unistream PLC (USC-P-B10) to communicate with an Opto-22 Snap Brain EB2 using Modbus TCP/IP. We're using this same application in various other places with no issues. At this particular site I am losing my link between the two devices. I added a counter and lost the link around 150 times in about 16 hours. The only difference I can come up with between this site and the others is the the enclosure also contains two VFDs. Could electrical noise be causing the interruption in the comms link? Any help would be appreciated. Quote Link to comment Share on other sites More sharing options...
MVP 2021 Flex727 Posted November 4, 2021 MVP 2021 Report Share Posted November 4, 2021 3 hours ago, Harperj said: Could electrical noise be causing the interruption in the comms link? Yes, absolutely. It's difficult to recommend a specific course of action without being onsite, but try ferrite cores on all the cabling and do what you can to distance the VFD and/or insulate the PLC from the VFD noise. I suspect there are others on this board who can provide some personal experience to help. Quote Link to comment Share on other sites More sharing options...
MVP 2021 Flex727 Posted November 11, 2021 MVP 2021 Report Share Posted November 11, 2021 By the way, there is an entire section in the Help file on minimizing EMI. It appears to be quite comprehensive and worthy of study for application to your problem. Take a look and see if it helps. Quote Link to comment Share on other sites More sharing options...
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