Hi I have a problem about the OPC Server.
Often when i download changes, the OPC server behaves strange: Some variables from some FB’s wont work, even that the program/FB isn’t changed. It start s working when the PLC is rebooted. Right now, i have a running system there cant be shut down, and cant be controlled from the HMI! That is not good. In this clip from UA expert, all variabels from the FB Machines1 don’t work any more. They worked until the download change.
Hi Emil, What hardware / firmware version are you using please? What version of PLCnext Engineer? Are you able to send us a project that shows this behaviour? (the simpler the better, if possible) It would also be great if you can give us a set of steps that reliably leads to this behavior, but I will understand if this is not available. Regards,
Martin.
Hi Martin Of course the newest… 
PLCnext 2020.6 and FW 2020.6.1
But the problem has been the same for the last 3-4 versions of firmware (where i ihave discovered it)
Problem is normaly if i add new OPC variables and then download change, but today i made a small change in the program, and after that the OPC stopped working on the Variables on the Machine1 FB. (Also some other single variables to.)
I’m not sure what excatly causes it every time, but i will send the program to you (i just sent it to Frank/Oliver to night to.) i will make a step-by-step video and send you to. - Emil