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Former Member

About current write mode in tag query

Hai all

can any body tell how to use current write mode clearly

here im working with ihistorian in this with current write mode i updated some tag values it is displaying those updated tagvalues in current write and current mode while testing but it is not displaying in history mode

so could u plz help me by explaining the process to work with current write clearly

its very urgent

Thanks in Advance


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1 Answer

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    Former Member
    May 31, 2007 at 05:09 PM

    Hi Apsara,

    For this clearly very urgent issue, perhaps you can restate the problem clearly.

    I suspect your problem is that the values that you have successfully (?) been writing to iHistorian are not showing up when you do a History query. If that is the case, use the HistoryEvent mode. The HistoryEvent mode will display actual recordings. The History mode uses various types of interpolation depending on RowCount, Duration, etc. If your mode is set to History you will not see the actual values.

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    • Apsara,

      I am not very familiar with iFix or iHistorian, but have worked with several other data historians in last couple of years. I have not seen where you can update a past value. You probably will need to check with the vendor to see if it is possible/allowed. By the nature of a current write mode, you are entering current data. Or put another way, only data for right now.

      Good luck,


      Edited by: Michael Appleby on Aug 18, 2008 2:02 PM