Bad Quality OPC Tag When Others Read And Browse Works


We have several PLCs from similar work cells added to a gateway and are pulling in a few OPC tags from them. On one of the cells, a tag is showing a bad quality and unable to see any diagnostics data or wrapper log info on why. There are other tags being read from this PLC, there’s very low utilization on the PLC itself so it’s not over exerting connections or memory, and this tag was dropped into its folder from the OPC tag browser. This is a UDT tag, but we have the several other cells with the same UDT and can pull in this tag address without issue. I appreciate any help with determining what could be wrong with connecting to this tag. Thank you.