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The server does not support writing of quality and/or timestamp.

  • miron
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17 Feb 2015 08:45 #2795 by miron
Thank you for explanation. It's working :-).

And thank you for your effort.

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16 Feb 2015 19:34 #2788 by admin
Normal OPC writes only write the item's value. There is a provision in OPC Data Access 3.0 for writing combinations (value/timestamp/quality), which is what happens when they are all present in the mapping and you perform a mapping Write.

There is a Operations members to the [DAItem] attribute, which defaults to DAItemMappingOperations.All. You can exclude the Timestamp and Quality mapped mebers from writing by specifying (in the [DAItem]) that the Operations should not include writing. It is a bit mapped enum, therefore you can combine the individual operation with a '|' operator.

Note: I will answer all your questions, but due to their number, please allow for some time. I appreciate your interest, though! :-)

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  • miron
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16 Feb 2015 15:16 - 16 Feb 2015 15:16 #2783 by miron
I would like to use in my mapping:
   [DANode(BrowsePath = "SomeValue")]
   [DAItem(Kind = DAItemMappingKind.Timestamp)]
   public DateTime TimestampSomeValue {get;set;}   
 
   [DANode(BrowsePath = "SomeValue")]
   [DAItem(Kind = DAItemMappingKind.Quality)]
   public DAQuality QualitySomeValue  {get;set;}   


but I got error:
*** Failure -1073478650 (0xC0040406): The server does not support writing of quality and/or timestamp.

I understand that my OPCKepware Server does not support writing this values
but I would like make my mapping only for reading this value.

How I should correctly accomplish this task?
Last edit: 16 Feb 2015 15:16 by miron.

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