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CALCSTATFUNC action
CALCSTATFUNC archIdent, timeFromIdent_TmA, timeToIdent_TmA, statFuncIdent_Int, validPercIdent_Int, paramIdent, retValueIdent, statusIdent_Int [,archivInstance_Int]
| archIdent | in | Reference to one value of historical value or reference to an object, values of which have been archived. Warning: If the parameter is the reference to an object archived several times, there is not specified which one of the historical objects is to be used. |
| timeFromItemIdent_TmA | in | Identifier of AbsTime type - interval beginning. |
| timeToItemIdent_TmA | in | Identifier of AbsTime type - interval end. |
| statFunctIdent | in | Identifier of Int type - statistical function type. |
| validPercIdent | in | Identifier of Int type - validation criteria. |
| paramIdent | in | Identifier of Int or Real types - parameter for some types of functions. |
| retValueIdent | out | Identifier for calculation result. |
| statusIdent | out | Calculation (action) success. |
| archivInstance_Int | in | Optional identifier of Int type - identification of archive instance. If the parameter is not defined, the value 0 will replace it. |
The action executes the calculation of the statistical function given by the statFuncIdent_Int parameter on the values represented by the archIdent historical value within the time interval specified by the timeFromIdent_TmA and timeToIdent_TmA parameters. After successful execution of the action, the retValueIdent parameter contains a result value of the calculation. The statusIdent_Int return code gets one of the following values:
- _ERR_TRANS_ABORT
- _ERR_TRANS_ERROR
- _ERR_TRANS_IGNORED
- _ERR_NO_ERROR
The set of implemented functions is equal with the functions, which may be configured for statistical archive (except the FILTER and EACOAVG functions). For the individual functions, there are predefined local constants in ESL.
The validPerctIdent_Int parameter represents the Validation criteria used during the evaluation of the statistical function. It accepts values within 0 .. 100 (the error ERR_RANGE_ERROR occurs if the condition is not met).
For some statistical function, entering the paramIdent parameter according to the table is required:
| Statistical function | Parameter description | ||||||||
| _STAT_F_INTEGRAL | Integral time units. For individual types, there are also established predefined local variables according to the table:
| ||||||||
| _STAT_F_GE_TIME _STAT_F_GT_TIME _STAT_F_LE_TIME _STAT_F_LT_TIME _STAT_F_ADDITION_PARAM _STAT_F_INCREMENT_PARAM _STAT_F_DELTA_PARAM | Compare value |
For the other statistical archive functions, the paramIdent parameter is not being evaluated.
Value of the archivInstance_Int parameter defines the instance of the archive which executes the request. If the parameter is not defined (or the value is 0), the active archive instance will execute the request.
The timestamp of the result is identical to the specified end of time interval timeToItemIdent_TmA.
Note: When calculating CALCSTATFUNC action, a time limit that is active in the computations of statistical archives and does not allow for calculation for future times, is no applied. With CALCSTATFUNC, it is, therefore, possible, for example, to calculate statistics over a script-filled archive that has data in the future.
TIME _bt
TIME _et
REAL _retValue
INT _retCode
_bt := %StrToTime("8:01:00 16-10-2003")
_et := %StrToTime("8:02:00 16-10-2003")
CALCSTATFUNC H.ArchObj, _bt, _et, _STAT_F_SUM, 100, 0, _retValue, _retCode
IF _retCode = _ERR_NO_ERROR THEN
; calculation done
ELSE
; an error occurred
ENDIF
Note 2
If it is necessary to calculate statistics over a periodic archive (e.g. H.Period), it should be noted that the periodic archive has values only in multiples of the period. For example, if it were necessary to calculate the integral from the periodic archive and the beginning of the interval would not be multiples of the period, 0 would be integrated from the beginning of the interval to the first multiple of the period.
This feature can be circumvented by creating a change-based computed archive object (e.g. H.PeriodOnRead) that is computed on-read and that copies H.Period. Integral computed from H.PeriodOnRead archive will behave as expected.
Related pages:
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