A.1.1 Example Aggregate data – Historian 1

For the purposes of Historian 1 examples consider a source historian with the following data:

Timestamp

Value

StatusCode

Notes

12:00:00

-

Bad_NoData

First archive entry, Point created

12:00:10

10

Raw, Good

12:00:20

20

Raw, Good

12:00:30

30

Raw, Good

12:00:40

40

Raw, Bad

ANNOTATION: Operator 1

Jan-02-2012 8:00:00 Scan failed, Bad data entered

ANNOTATION:

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

12:01:00

60

Raw, Good

12:01:10

70

Raw, Uncertain

ANNOTATION: Technician_1

Jan-02-2012 8:00:00 Value flagged as questionable

12:01:20

80

Raw, Good

12:01:30

90

Raw, Good

null

No Data

No more entries, awaiting next scan

The example historian also has Annotations associated with three data points.

image009.jpg

Figure 6 – Example Data for Historian 1

For the purposes of all Historian 1 examples:

  1. TreatUncertainAsBad = False. Therefore Uncertain values are included in Aggregate calls.
  2. Stepped Attribute = False. Therefore SlopedInterpolation is used between data points.
  3. UseSlopedExtrapolation = False. Therefore SteppedExtrapolation is used at end boundary conditions.
  4. 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.