Is it possible to start and stop Tag Historian, so that data is only collected when desired?
You probably need to look into a new scan class, using the “driven” mode and assign the tags you want to start/stop to that scan class.
I only show two scan class options, Default and Default Historical to choose between.
I spoke too soon. I found where to edit the scan class.
Keep in mind that the tag historian is really not built around this kind of workflow. Tag historian and it’s sliding window algorithm/compression is best for constant value changes at a reasonably consistent sample rate. If you want event-driven value storage, transaction groups are really the best choice.