Clarification in the configuration of historian 2 data.|OPC UA Standard|Forum|OPC Foundation

Hello team.

The OPC UA document states the configuration for Historian 2 as provided below;

For the purposes of all Historian 2 examples:

• TreatUncertainAsBad = True. Therefore Uncertain values are treated as Bad, and not included in the Aggregate
• 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.

In the aggregate tester utility of OPC UA, the same configuration has been taken with 1 deviation, i.e. UseSlopedExtrapolation = True.

Consider Historian 2 relevant datapoints near to interval 1:20 to 1:36;

The output for 1:20 to 1:36 interval is given below;

So if we consider UseSlopedExtrapolation = True, and decide on the last interval 1:20 to 1:36 of DurationGood Aggregate, following is the observation;

• The value interpolated at 1:20 is Bad.
• The value at 1:30 is however should be extrapolated using 1:26 Good and 1:30 Good. Thus if extrapolated value is Good, the region calculation would give duration good value for this interval to be 13001.

So the doubts are;

1. What is the parameter value of UseSlopedExtrapolation for Historian 2.

2. How to do slopped extrapolation for Simple bounding. And what’s its quality when extrapolated using 2 good points? Is the above 13001 value correct?