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02/12/2016
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Hello,
With reference to Part 13: Aggregates OPC UA Specifications I have the following questions
Section A.1.2 Example Aggregate data – Historian 2 has the following configuration
Stepped Attribute = False. Therefore SlopedInterpolation is used between data points.
UseSlopedExtrapolation = False. Therefore SteppedExtrapolation is used at end boundary conditions
Examining the Interpolative data in section A.2.2 for Historian2 , The last aggregate interval has used sloped extrapolation and computed the result instead of steped extrapolation( deviation from what is configured)
Could you please justify how the last aggregate interval has computed?
| 12:01:35.000 | 102.500 | UncertainDataSubNormal, Interpolated |
04/01/2014
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You are correct to question the value because it is incorrect in table A.2.2 for Historian2 (UA spec 1.03). The value should be 90 based on the previous Raw value and the UseSlopedExtrapolation being set to False. The examples for Historan1 and Historian3 have the correct value. This is an error and I will enter an issue at the OPC Foundation.
Rod Stein Manager of Technology Matrikon OPC http://www.matrikonopc.com
04/01/2014
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The issue has been added.
Rod Stein Manager of Technology Matrikon OPC http://www.matrikonopc.com
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