I'm writing to ask for clarification regarding Tag Groups.
If I enable history for a tag by setting its "Sample mode" property to "Tag Group", and this specific Tag Group is configured with a "Rate = 10000", will the data be saved every 10 seconds regardless of whether it changes, or will it check for changes every 10 seconds and only save the data if it has changed?
I'm going to bump this. Not that I have an answer, but I'm interested.
With very recent experience. No.
The only way I've found to insure that a tag is recorded at a set rate, is to set the Maximum time between samples.
Pretty sure this is outlined in the docs. I believe deadband and max time determine whether a new data entry is made. The sample time determines how often the tag value is checked, to filter against the above criteria. So a sample time of tag group uses the tag groups settings to determine WHEN to check the tag value, and deadband and max time determine IF to make a log entry.
Probably an over simplification but thats what i understand.