Hello Walter,
thank you for your response. Recommended solution helps but only partially - at a minimum, it acts as a safe entry point for function recovery. After editing the directory, I can freely use DAC blocks except the only one, which is the OPC block. Unfortunately, this is the most important thing I need for my work. After editing the directory, I can freely use DAC blocks except the only one, which is the OPC block, the opening of which will always cause the specified error. Unfortunately, this is the most important thing I need for my work.
I work with the OPC server from the company Software Toolbox even in the older version of DIAdem 2011 and there has never been any problem of working with DAC blocks or communication. Everything could be set up comfortably.
In the end, I found a solution to work around this peculiarity in version 2021, and I send screenshots to this. It is interesting that I can work with this comfortably without any error, but clicking on the original NI block for OPC always means same failure mode and using the solution described by you to correct DIAdem to the initial conditions.
Regards
Milos
