The standard deviation is also used to describe where most of the data should fall, in a relative sense, compared to the time weighted average. Usually represent by the Greek letter (Sigma) σ. Standard Deviation: The time weighted standard deviation value of the retrieval cycle. Unfortunately in this query type, you don't have an MaxDateTime: The time stamp associated with the maximum value.Īverage: The time weighted average value of the retrieval cycle. Maximum: The maximum value that occurred within the retrieval cycle. MinDateTime: The time stamp associated with the minimum value. Minimum: The minimum value that occurred within the retrieval cycle. LastDateTime: The time stamp associated with the Last value, which can be earlier than the StartDateTime if this is the initial value for the retrieval cycle. Last: The last value within the retrieval cycle or the most recent value prior to the cycle. PercentGood: The percentage of rows with good quality in relation to the total number of rows in the retrieval cycle.įirst: First value within the retrieval cycle or the most recent value prior to the cycle.įirstDateTime: The time stamp associated with the first value of the retrieval cycle. OPCQuality: The quality value received from the data source. StartDateTime: The start time of the retrieval cycle.ĮndDateTime: The end time of the retrieval cycle. SourceServer: The source server of the tag. For more information see, ArchestrA Naming Conventions. For ArchestrA attributes, you can also choose to show the hierarchical name along with the attribute reference. If the data values are coming from ArchestrA, the attribute reference is shown as the tag name. Tag Name: The name of the tag within the Wonderware Historian server. I will be using a regular analog tag in the Historian for my example. I will be using this Query Type without defining a Summary Tag in the Wonderware Historian. There are some pieces worth explaining further than what is listed in the help file. There is a query type called " Analog Statistics" that is replacing the " Analog Summary Values" query type in the Wonderware Historian Client Query.