Hello.

Thank you for information about the broken link. We will look into it. But,m there wasn't supposed to be more information that already listed on opclabs.doc-that.com/files/onlinedocs/QuickOpc/Latest/User%2...ing.DAPropertyMappingKind.html .

I have some additional questions.

1. I assume that "the parameter is incorrect" is the value of the var1ErrorMessage property in runtime, and not some compilation error - please confirm.
2. Is that the full and precise text of the error message?
3. When is the first time the var1ErrorMessage property is to set this value (or any non-empty string)? Is it during the Read, the WriteTarget, or the Subscribe call?
4. Please add one more property, this type with DAItem(Kind = DAItemMappingKind.ErrorMessage) (and also typed as Exception). This will have nore information than just the ErrorMessage. And, please report here the full text of the exception in this property, its call stack, and if there is a non-null InnerException, the same for the inner exception, recursively.

Thank you

Hello.

If "nothing happens" in Live Mapping, it usually means that there are errors. But, you do not get to see any errors, unless you add a corresponding mapping for the error too (opclabs.doc-that.com/files/onlinedocs/QuickOpc/Latest/User%2...n%20the%20Mapper%20Object.html ).

See opclabs.doc-that.com/files/onlinedocs/QuickOpc/Latest/User%2...rame.html#Mapping%20Kinds.html for the mapping kinds - you need e.g. ErrorMessage, Exception, or one of those...

Try adding the following mapped property to your mapped class - something like:

Then, inspect the value of this property after the Read, and the WriteTarget call.

Best regards