Use the PIACEPoint.ArcMode property to set the archive mode to dmReplaceDuplicates so that archive values with the same timestamp will be replaced.
I've edited and re-started my Project, now can wait a new data. I'll let you know the result.
It works perfectly, thank you very much.
I'm sorry a lot for the delay in my reply, the day I made the changes our plant still down and could not verify the correct functioning of the changes, the next day I left on vacation, so I could not check until my return.