Applies To:
  • CitectSCADA 5.50 Service Pack C
  • CitectHMI 5.50 Service Pack C

Continual backfilling of missing trend samples has the potential to cause excessively high CPU load.

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:


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..