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Topic not updated with quality that is not bad (timeout)

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22 Feb 2016 11:40 #3872 by alexf
Hello!

I am using ReadItemValue.

So I will try the ReadItem method and dig further into this issue.
Thank you

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22 Feb 2016 10:57 #3871 by support
Hello,
Is that ReadItem/ReadMultipleItems or ReadItemValue/ReadMultipleItemValues?

Assuming that you are calling ReadItemValue/ReadMultipleItemValues:
These methods return just the actual Value, while OPC server always supplies a triple of Value/Timestamp/Quality. Since the Value is generally only available when the Quality is Good/Uncertain, these methods set up an additional subscription to observe the values wait until the quality becomes Good or at least Uncertain. If the server does not supply a VTQ with a Good/Uncertain quality within a timeout period, there is no Value we can give you, and you receive this error.

You can use ReadItem/ReadMultipleItems instead. In that case, you receive the whole VTQ - and it is then up to you (your code) to decide what to do if the Quality is not Good/Uncertain and therefore there is no Value to talk about.

Best regards

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22 Feb 2016 09:06 #3870 by alexf
Hello Support!

While executing a read command, I get the following error message.

Error Details:
Description: "Topic not updated with quality that is not bad (timeout)"
Number: -1073430513
Source: "OpcLabs.EasyOpcRaw.DataAccess.RawEasyDAClient"

Can you give me some details what this error message means as I could not search in the online help, and the Reference chm file could not be downloaded (Error 404).

Thank you

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