PVSS00event - IMPL/WARNING - statFunc work: Omitted X periods in calculation
Enclosed you'll find the explanation for a log-message which occurs when some intervals for statistical functions are not calculated, the log-message is written to the PVSS_II.log-file.
PVSS00event (0), 2010.08.04 15:31:43.033, IMPL, WARNING, 54, Unexpected state, statFunc work: , System1:Plant_1.counter.C1.AVG_WT0, Omitted 2 periods in calculation
Log-message with symbolic names:
PVSS00event (0), <TIMESTAMP>, IMPL, WARNING, 54, Unexpected state, statFunc work: , <dp-element-name>, Omitted X periods in calculation
"X" is substituted with the number of intervals which are not calculated.
When the standard-settings are used the log-message occurs when the delay-time is more than 3 times greater than the calculation interval.
The delay times should always be shorter than the calculation interval.
Please check and modify the configuration for the statistical function at the given dp-element to avoid this error and to ensure that all intervals are calculated.
With the config-entry statFctMaxIntervalsInPast for the event-manager ([event]-section) you can define how many intervals in the past can remain not calculated.
The limitation is part of the error tolerance stability functions in WinCC OA. The number of open intervals is limited to control the memory usage of the event-manager and to avoid a high cpu-usage for a short period when a lot of values need to be recalculated by statistical functions.
Therefore this limitation shall only be changed if it is really necessary for the application.
Please discuss it with your common support contact before changing this value or if you need assistance and further information.