Hello.
Thank you for the answers, I think that it is now clear to me what you are doing.

It is likely that there is an error during writing (and maybe during reading/subscriptions as well) in the production environment - you just do not see it, because you have not set up the application to handle it.

Please read this: opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Late...del%20in%20Live%20Binding.html . There are types of errors described (I / II / III) and how to handle them; however, in your case, the most likely cause is described in the (unnumbered) last paragraph. In order to visualize such errors, add some text box/text boxes to your screen, and bind them to the *same* OPC node as you are reading/writing, but this time setting the Kind to ErrorMessage (opclabs.doc-that.com/files/onlinedocs/OPCLabs-OpcStudio/Late...rame.html#Mapping%20Kinds.html ). This will cause any error message associated with the operations to appear in the additional text box.

I should also say that in general, binding both directions (writes, and reads+subscriptions) with "All" to the same control is tempting, but has all kinds of issues related to it. Possibly even more so, if you specify the write event source as "ValueChange" on the same control. Every change (most keystrokes) in the control will then trigger the write, which will then - when successful, and with some delay - update the control again. This may result in "flickering" or other issues.

Hello.

I do not quite understand your description (e.g. what do you mean by "value.... is deleted", "does not appear" - appear where?, "I ... see the value" - see where?). But for myself I have summarized as "you call the Write, but it does not happen, and there is no error reported". If I have incorrect understanding, please elaborate precisely on what you are doing and what is happening.

If my understanding is correct, then the first question actually is: If there *was* an error reported during the Write, would you know about it? That is, do you have th eproper error handling core around the calls to QuickOPC methods? For example, if you are using the EasyUAClient.WriteValue method, this method would thrown a UAException n case of a problem. Do you have a code to catch, handle, and report such exception? If so, can you post the skeleton of such code here?

Best regards

This is not related to licensing.

If you are getting an error upon writing, please provide the full error message.

Best regards