I am uncertain if an 'it depends' is general enough.
With PI Interfaces, you usually can chose from different options when configuring the interface. I am choosing the PI Interface for OPC DA as example. Please check the PI Interface for OPC DA User Guide for the meaning and usage of the /ts switch.
Thanks a bunch, Gregor.
This actually gave me the necessary understanding of what is going on.
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Please allow me to assume my answer as the [Correct Answer]. You should be able to undo this any time if necessary.