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,
- I connected to the OPC DA server.
- I created a group that requests updates at 20 ms.
- I added a tag.
- I click "Advise".
- 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.