Can you please try following two things:

1) Based on your example with GetPropertyValue, can you try SubscribeItem (and hook to an event handler and observe whether you receive valid data, or eventArgs.Exception != null with "Access Denied"?). Reason: getting property values, reading and writing items is different from subscriptions. The subscriptions need bi-directional function calls, and more permissions. It is therefore possible that in some situations, get/read/write works, but subscriptions don't.

2) If you are on 64-bit operating system, set the target of your build to "x86" (and not "Any CPU" or "x64")? Reason: "Online Design" works from within Visual Studio IDE, which is a 32-bit process. By setting the target platform to "x86" (32 bits), you get closer to what happens with "Online Design".

3) Can you please try to assign different combinations to following static properties - in the code, before the very first OPC operation is attempted:

EasyDAClient.ClientParameters.UseCustomSecurity
EasyDAClient.ClientParameters.TurnOffActivationSecurity
EasyDAClient.ClientParameters.TurnOffCallSecurity

(TurnOffCallSecurity only has any influence when UseCustomSecurity == true)

Best regards

Thank you for the video.

It is quite likely that instead of an update that actually carries a valid data value, an update comes in with an error message. When you bind just the Value, it then looks like no updates are coming.

In order to get better diagnostics, please add an additional static text control, bind it to the Simatic server and tag, but set the MappingKind to ErrorMessage.

Best regards

I have enabled .MPG now - please try again.

Thank you. What is the file extension of the video? I will allow it for posting.

Can you please clarify some points?

1. When you say "....I start the debugging", are you actually stopping the program (e.g. using breakpoints) momentarily?
2. I understand that in design mode the values do update. Are you saying that they also update when you run the program without the debugger?
3. Does the behavior actually depend on a) whether you run under debugger or not, or b) whether you build it in Debug or Release configuration?
4. Have you made some binding to display the status/errors? (see the documentation). The aim is to distinguish the case where NO updates are coming whatsoever, from the case where there is some error )with an associated explanatory message...).
5. "... with the DEMO OPCServer" - do you mean the simulation server we ship with the product?
6. "... with the DEMO OPCServer" - are you using the same program but just with different bindings? Can you place both the binding for Simatic and for the demo server on the same form and run them together ? - trying to eliminate other reasons for the difference.

Thank you