For the purposes of Historian 1 examples consider a source historian with the following data:
|12:00:00||-||Bad_NoData||First archive entry, Point created|
|12:00:40||40||Raw, Bad||ANNOTATION: Operator 1
Jan-02-2012 8:00:00 Scan failed, Bad data entered
Jan-04-2012 7:10:00 Value cannot be verified
|12:00:50||50||Raw, Good||ANNOTATION: Engineer1
Jan-04-2012 7:00:00 Scanner fixed
|12:01:10||70||Raw, Uncertain||ANNOTATION: Technician_1
Jan-02-2012 8:00:00 Value flagged as questionable
|null||No Data||No more entries, awaiting next scan|
The example historian also has Annotations associated with three data points.
Figure 6 – Example Data for Historian 1
For the purposes of all Historian 1 examples:
- TreatUncertainAsBad = False. Therefore Uncertain values are included in Aggregate calls.
- Stepped Attribute = False. Therefore SlopedInterpolation is used between data points.
- UseSlopedExtrapolation = False. Therefore SteppedExtrapolation is used at end boundary conditions.
- PercentBad = 100, PercentGood = 100. Therefore if all values are Good then the quality will be Good, or if all values are Bad then the quality will be Bad, but if there is some Good and some Bad then the quality will be Uncertain.