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Thread: Historian Aggregation

  1. #1

    Default Historian Aggregation

    Hi Guys
    While Aggregating the Values from the historian I am having the option of Sum, Avg, Min, Max. But We Need the Number of Samples and Standard Deviation of all the values that are to be aggregated. Any possible ways to do so?

  2. #2
    Join Date
    01.07.2008
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    Salzburg, AT
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    Default Re: Historian Aggregation

    I suppose you would need create additional variables, e.g. MATH driver can calculate it in 'statistics' formulas. 
    Help: MATHDR32 -> Driver-specific functions -> Formulas -> Float formula -> Statistics 

    The Count() formula is detecting and counting limits of source variables. A variable can be linked to rema detecting any value change as limit. Formula counts together on these limits (states in reaction matrix) where property 'State number for counter in the mathematics driver' is used.

    Is this Historian recording in cycle or 'on change'?

  3. #3

    Default Re: Historian Aggregation

    no its cyclic changing

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