Something strange I noted yesterday. I was connected to one of my CompactLogix PLCs via RSLogix 5000 so I could watch incoming data. At the same time I had just started a new historical transaction group on Ignition to log this data using a trigger with the OPC data mode set to read. I tried triggering the data log numerous times with no success. I also noted I was missing one tag due to my oversight so I went to my OPC tag list to get it only to find it wasn’t there. Since this tag had only recently been added to the PLC I figured I just needed to refresh the OPC browser - that didn’t work. So, I tried “refresh browse” on the devices page plus refreshing the OPC browser - that didn’t work. Since I had a connection established to the PLC I thought that might be interfering, so I edited my device connection and set “concurrent requests” to 2 - that worked.
So, my question is, “Did setting concurrent request to 2 have this impact or was it the fact that the device was restarted by editing it?”