Object ExtWriteAction

Caution: This extension is used for extended configuration of the PmVar object functionality related to writing a new value. This does not cause connection of the PmVar object with other system components (e.g. alarms, events, trends, communications etc.). Therefore there can be only one such extension in the PmVar object (the extended functionality is either present or not present). The order of processing the written value: If triggering the onItemBeforeWrite event is enabled, then the event is triggered for this variable always closely before writing or before the change of the variable value. Unconsidered enabling for all variables can cause unnecessary utilization of the processor. For example if the object contains 1000 variables and each one has calling enabled then by writing new values into all values of the object can cause calling the onItemBeforeWrite event 1000 times (each time with another pEvent.Item parameter value). It is also better (if it is required to react to writing or the change of the variable) to enable the onItemAfterWrite event instead of onItemBeforeWrite. Enabling onItemBeforeWrite is useful only if, for example, you need to test the written value and in a necessity to change it (to filter it). The pEvent.NewVal property in the onItemBeforeWrite event is defined for read and write and therefore it is possible in the event to enforce another value than the one that is really written.
If triggering the onItemAfterWrite event is enabled, then the event is triggered for this variable always after writing or after change of the variable value. For enabling this event similar remarks are valid for the onItemBeforeWrite event. Enabling the onItemAfterWrite is useful for variables that change their value not too ofter and in this case is it suitable to enable calling 'after change'.
Caution: The onItemBeforeWrite event and the onItemAfterWrite event is not triggered if it isn't written into the variable directly, i.e. if the variable is bind to another value.

Format of saving the data extension in the form of a text string:
The content of complete of data extension (all configurators) can be saved in the form of single text string. See Format of saving the data extension in the form of a text string.
Id={WriteAction; BeforeWrite; AfterWrite; QualityTestEnabled; QualitySubstValue; MinTestEnabled; MinValue; MinSubstValueEnabled; MinSubstValue; MinSubstQualityEnabled; MinSubstQuality; MaxTestEnabled; MaxValue; MaxSubstValueEnabled; MaxSubstValue; MaxSubstQualityEnabled; MaxSubstQuality}