统一体系结构第11部分:历史访问

[中文适用范围]： 本部分是 IEC 62541 标准系列的一部分，定义了与历史访问（HA）关联的信息模型。它特别包括用于历史访问的节点类和属性的额外和补充描述、额外的标准属性以及其他信息和行为。完整的地址空间模型（包括所有节点类和属性）在 IEC 62541-3 中规定。预定义的信息模型在 IEC 62541-5 中定义。检测、访问历史数据和事件的服務以及可扩展参数类型的描述在 IEC 62541-4 中规定。本文档包括计算和返回聚合（如最小值、最大值、平均值等）的功能。信息模型和聚合的具体工作方式在 IEC 62541-13 中定义。 [外文原描述]： IEC 62541-11:2020 RLV contains both the official IEC International Standard and its Redline version. The Redline version is available in English only and provides you with a quick and easy way to compare all the changes between the official IEC Standard and its previous edition. IEC 62541-11:2020 is part of the OPC Unified Architecture standard series and defines the information model associated with Historical Access (HA). It particularly includes additional and complementary descriptions of the NodeClasses and Attributes needed for Historical Access, additional standard Properties, and other information and behaviour. The complete AddressSpace Model including all NodeClasses and Attributes is specified in IEC 62541-3. The predefined Information Model is defined in IEC 62541-5. The Services to detect and access historical data and events, and description of the ExtensibleParameter types are specified in IEC 62541-4. This document includes functionality to compute and return Aggregates like minimum, maximum, average etc. The Information Model and the concrete working of Aggregates are defined in IEC 62541-13. This third edition cancels and replaces the second edition published in 2015. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) a new method for determining the first historical point has been added; b) added clarifications on how to add, insert, modify, and delete annotations.