Hello
In my .NET Framework 4.7.2 project I am subscribing to multiple OPC DA Classic items (just few 3-4 items for test) with the following sample code, below. The code works fine but surprisingly the data is read very often as value null with quality "UncertainNonspecific LimitOk (64)". I can say that min 30-40% of the total data changes are read with this quality code. I have also tried on different OPC DA servers, but result was the same.
For comparing I have subscribed to the same items with the OPC DA test client. But in this case I always get good quality 192. Is it possible that there is a problem with the code I am using?
In my .NET Framework 4.7.2 project I am subscribing to multiple OPC DA Classic items (just few 3-4 items for test) with the following sample code, below. The code works fine but surprisingly the data is read very often as value null with quality "UncertainNonspecific LimitOk (64)". I can say that min 30-40% of the total data changes are read with this quality code. I have also tried on different OPC DA servers, but result was the same.
For comparing I have subscribed to the same items with the OPC DA test client. But in this case I always get good quality 192. Is it possible that there is a problem with the code I am using?
