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Siemens Industry Online Support
Siemens AG
Entry type: FAQ Entry ID: 22286245, Entry date: 04/11/2016
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Why are the characters "i" and "u" sometimes displayed with the tag values in WinCC?

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The characters "i.", "u." or "i. u." after the measured values stand for "interpolated" (i) and "uncertain".

"Interpolated" means that the value displayed lies between two archived measured values.

"Uncertain" means:

  • No connection is available.
  • Only the initial value of a tag is available.
  • The initial value is not known after enabling Runtime.
  • A substitute value is being used.

Detailed information is available in the WinCC Online Help:

  • In WinCC V6 under "WinCC Information System > Working with WinCC > Archiving process values > Output of process values > Process value output in process pictures > Process value output in trend form in process pictures > WinCC Online Trend Control" under the item "Coordinate Points".
  • In WinCC V6.2 under "WinCC Information System > Working with WinCC > Archiving process values > Output of process values > Output of process values in process pictures > Process value output in trend form in process pictures > Operation in Runtime > Determining the coordinates of a point"
  • In WinCC V7 for the use of "WinCC Online Trend Control before WinCC V7" under "WinCC Information System > Working with WinCC > Archiving process values > Output of process values > Process Value Output before WinCC V7 > Before WinCC V7: Process value output in trend form in process pictures > Operation during Runtime >How to Determine Coordinate Points ".
  • In WinCC V7 under "WinCC Information System > Working with WinCC > Archiving process values > Output of process values > Output of process values in process pictures > Process value output in trend form in process pictures > Operation in Runtime > How to Determine Coordinate Points"


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