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  5. QuickOPC-Classic in .NET
  7. Reading, Writing, Subscriptions, Property Access
  9. Subscription of the same item in two different objects with different updaterates.

Subscription of the same item in two different objects with different updaterates.

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31 Jul 2014 05:57 #2113 by LuisGar
Replied by LuisGar on topic Subscription of the same item in two different objects with different updaterates.
Thanks, that solve my problem.

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30 Jul 2014 16:27 #2107 by support
Replied by support on topic Subscription of the same item in two different objects with different updaterates.
Hello, the behavior you describe is by design. It is an optimization based on an idea that multiple subscriptions can be replaced by a single one with the fastest rate. Depending on the requirements, sometimes this is not desired, as it is in your case.

You can choose a different behavior as well.

I suggest that you set the Isolated property on each of your EasyDAClient objects to 'true', right after instantiating them.
The following user(s) said Thank You: LuisGar

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30 Jul 2014 07:22 #2104 by LuisGar
Subscription of the same item in two different objects with different updaterates. was created by LuisGar
Hi.

I am trying to generate two different objects, one for visualization, the other to store the values gotten from the OPC server in the database, I want to subscribe the OPC items at different rates, for example I want for visualization to display the values every 1000 ms and to store them every 5000 ms.
I have two EasyDAClients, with one of them I update the visualization with another one I do update my DB. If I susbcribe an item just in the DB client, it update correctly every 5000 ms, but as soon as I subscribe the same item in the Visu Client, I also get updates in my DB every 1000ms,

Is there a reason why it works in that way?

It is possible two have different Clients, with the same OPC item but at different rates?

Best Regards

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  1. Forum
  3. Discussions
  5. QuickOPC-Classic in .NET
  7. Reading, Writing, Subscriptions, Property Access
  9. Subscription of the same item in two different objects with different updaterates.
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