Annex A (informative) Aggregate Specific examples – Historical Access

A.1 Historical Aggregate specific characteristics

A.1.3 Example Aggregate data – Historian 3

This example is included to illustrate stepped data. For the purposes of Historian 3 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 8 – Example Data for Historian 3

For the purposes of all Historian 3 examples:

1. TreatUncertainAsBad = True. Therefore Uncertain values are treated as Bad, and not included in the Aggregate call.
2. Stepped Attribute = True. Therefore SteppedInterpolation is used between data points.
3. UseSlopedExtrapolation = False. Therefore SteppedExtrapolation is used at end boundary conditions.
4. PercentBad = 50, PercentGood = 50. Therefore data will be either Good or Bad quality. Uncertain should not happen since a value is either Good or Bad.