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OPC-10000-200 – OPC Unified Architecture - Part 200: Industrial Automation6.2.3 IRollingStatisticsTypethat Node. 0:HasProperty Variable WindowDuration 0:Duration 0:PropertyType O 0:HasProperty Variable WindowNumberOfValues 0:UInt32 0:PropertyType O WindowDuration describes the duration after the statistical data are rolled ... even if the time interval between the StartTime and the current time is longer. WindowNumberOfValues describes the maximum number of values before the data gets rolled over. For the statistical