Applies To:
  • CitectSCADA 5.50 Service Pack C
  • CitectHMI 5.50 Service Pack C
Summary:
Continual backfilling of missing trend samples has the potential to cause excessively high CPU load.
 

Solution:
Citect has confirmed this to be a problem in CitectHMI/SCADA versions 5.42 r0 to 5.50 Spk B. This problem has been fixed in version 5.50 Spk C.

It was therefore necessary to introduce a citect.ini parameter to disable the runtime backfilling of trend data:

[Trend]
DisableRuntimeBackfill=1

which defaults to 0. If set to 1 this parameter will stop the trend server from continually updating from the redundant trend server but will synchronise on trend server connection..
 
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