I need to get a cumulative production for month. The production tag is not a PI Point, is obtained using tables via OLEDB, there are only values at 12:00 am that represent the production of the day. I am doing a notification to send a summary every monday where show the cumulative production of the last 7 days (I did it using tag val since -7d to -1d) but I also need the cumulative production since the first day of the month to current day. What kind of function or formula could help me???
Thanks in advance.