Applies To:
  • CitectSCADA 5.31, 5.40, 5.40 Service Pack A

The display updates by a factor of the subgroup size of the SPC Trend when it should just update every display period for Periodic Trends or every event for Event Trends. When your display period is less than the sample period on a Periodic Trend, gaps are shown in the Trend, or no Trend is shown at all.  

CIT has confirmed this to be a problem in Citect for Windows versions 5.31 to 5.40 Service Pack A. This problem has been fixed in version 5.40 Service Pack B.