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  1. Forum
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  5. QuickOPC-Classic in .NET
  7. Reading, Writing, Subscriptions, Property Access
  9. Can I read a value at a specified date/time?

Can I read a value at a specified date/time?

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14 Feb 2024 17:26 #12554 by support
Replied by support on topic Can I read a value at a specified date/time?
No, we do not (and to make it clear, we currently do not support the HDA part of OPC UA either).

Regards

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14 Feb 2024 16:23 #12553 by ScottEwine
Replied by ScottEwine on topic Can I read a value at a specified date/time?
Do you have any tools that support HDA, I know the customer's server supports it, I do not want to use UA.

Scott

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14 Feb 2024 16:16 #12552 by support
Replied by support on topic Can I read a value at a specified date/time?
Hello.
No, OPC DA (Data Access) does not have that.

What you are asking for is possible using OPC HDA (Historical Data Access), and a corresponding functionality in the newer OPC UA specs.
But the OPC HDA spec must be supported by the server (not so common!), and, QuickOPC does not support OPC HDA.

Regards
The following user(s) said Thank You: ScottEwine

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14 Feb 2024 16:12 #12551 by ScottEwine
Can I read a value at a specified date/time? was created by ScottEwine
Good Morning,

I would like to read the value if an item at a specified date/time to load historical data into another system, something like this, where I specify an additional parameter:

dAVtq = easyDAClient1.ReadItem(MachineName, ServerName, ItemID ,dateTime );

Is this possible?

Thanks, Scott

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  1. Forum
  3. Discussions
  5. QuickOPC-Classic in .NET
  7. Reading, Writing, Subscriptions, Property Access
  9. Can I read a value at a specified date/time?
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