IEC 62541-13-2020 OPC Unified Architecture – Part 13: Aggregates

IEC 62541-13-2020 OPC Unified Architecture – Part 13: Aggregates. The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC TR 62541 -1 , OPC Unified Architecture – Part 1: Overview and Concepts IEC 62541 -3, OPC Unified Architecture – Part 3: Address Space Model IEC 62541 -4, OPC Unified Architecture – Part 4: Services IEC 62541 -5, OPC Unified Architecture – Part 5: Information Model IEC 62541 -8, OPC Unified Architecture – Part 8: Data Access IEC 62541 -1 1 , OPC Unified Architecture – Part 11: Historical Access 3 Terms, definitions, and abbreviated terms 3.1 Terms and definitions For the purposes of this document, the terms and definitions given in IEC TR 62541 -1 , IEC 62541 -3, IEC 62541 -4, and IEC 62541 -1 1 and the following apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: • IEC Electropedia: available at http://www.electropedia.org/ • ISO Online browsing platform: available at http://www.iso.org/obp 3.1.1 ProcessingInterval timespan for which derived values are produced based on a specified Aggregate Note 1 to entry: The total time domain specified for ReadProcessed is divided by the ProcessingInterval. For example, performing a 1 0-minute Average over the time range 1 2:00 to 1 2:30 would result in a set of three intervals of ProcessingInterval length, with each interval having a start time of 1 2:00, 1 2:1 0 and 1 2:20 respectively. The rules used to determine the interval Bounds are discussed in 5.4.2.2. 3.1.2 interpolated data data that is calculated from data samples Note 1 to entry: Data samples may be historical data or buffered real time data. An interpolated value is calculated from the data points on either side of the requested timestamp. 3.1.3 EffectiveEndTime time immediately before endTime Note 1 to entry: All Aggregate calculations include the startTime but exclude the endTime. However, it is sometimes necessary to return an Interpolated End Bound as the value for an Interval with a timestamp that is in the interval. Servers are expected to use the time immediately before endTime where the time resolution of the Server determines the exact value (do not confuse this with hardware or operating system time...