how archive data is collected
I have tracked “B2-FW-FLOW” variable in the trend and in the archived file (for two consecutive files which is 14 days). As we know the sample time in the trend where this tag has been configured is 5 min. and the archiving time for the trend is 7 days. So every 7 days an archive file will be created and after doing the calculation of: 12 collected values in an hour multiply by 24 hrs. and also multiply by 7 days, the result is 2016 points that each variable should have on each file created.
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you have to consider that Freelance will not store data, if the data has not changed. So what looks like Freelance skipping a sample is actually a storage optimization. If you look at column 7 you will see quite some jumps in timing. During that time the last stored value has not changed.