This example is included to illustrate non-periodic data. For the purposes of Historian 2 examples consider a source historian with the following data:
|
Timestamp |
Value |
StatusCode |
Notes |
|
12:00:00 |
- |
Bad_NoData |
First archive entry, Point created |
|
12:00:02 |
10 |
Raw, Good |
|
|
12:00:25 |
20 |
Raw, Good |
|
|
12:00:28 |
25 |
Raw, Good |
|
|
12:00:39 |
30 |
Raw, Good |
|
|
12:00:42 |
- |
Raw, Bad |
Bad quality data received, Bad data entered |
|
12:00:48 |
40 |
Raw, Good |
Received Good StatusCode value |
|
12:00:52 |
50 |
Raw, Good |
|
|
12:01:12 |
60 |
Raw, Good |
|
|
12:01:17 |
70 |
Raw, Uncertain |
Value is flagged as questionable |
|
12:01:23 |
70 |
Raw, Good |
|
|
12:01:26 |
80 |
Raw, Good |
|
|
12:01:30 |
90 |
Raw, Good |
|
|
|
- |
No Data |
No more entries, awaiting next Value |
Figure 7 – Example Data for Historian 2
For the purposes of all Historian 2 examples:
- TreatUncertainAsBad = True. Therefore Uncertain values are treated as Bad, and not included in the Aggregate call.
- 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 unless 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.