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How can OPC DA Server be configured for a frequently-updating tag (every 100 ms)?

Question asked by isolutions on Jul 11, 2017
Latest reply on Jul 13, 2017 by pmackow

According to the OPC DA Server 2017 user manual, "PI OPC DA Server 2017 allows a minimum update rate of 20 milliseconds."

However, if a tag is updated every 100 ms, only half of the updates make it through.

 

In PI OPC Client,

  1. I connected to the OPC DA server.
  2. I created a group that requests updates at 20 ms.
  3. I added a tag.
  4. I click "Advise".
  5. I click "0" beside "Updates" to reset the counter from 1 to 0.

I have a program to update that tag every 100 ms until I stop it. After it updates 71 times, the client shows 37 updates.

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