标准摘要
[中文适用范围]： IEC 62541-14:2026 标准定义了“发布/订阅”（PubSub）通信模型。该标准规定了 OPC UA 的发布/订阅模式，作为对 IEC 62541-4 中服务所定义的客户端/服务器模式的补充。有关这两种模型及其不同用途的概述，请参阅 IEC 62541-1。 PubSub 模式支持将 OPC UA 信息源产生的数据和事件分发给设备网络内部感兴趣的对象，以及 IT 和分析云系统中的相关观察者。 本文件包含以下内容： - 对 PubSub 概念的总体介绍； - PubSub 配置参数的定义； - PubSub 概念及配置参数与消息及传输协议的映射关系； - PubSub 配置模型。 本版（第二版）作废并替代了 2020 年发布的第一版，属于技术性修订。相较于前一版，本版包含以下重大技术变更： a) 新增“数量模型”，可从工程单位属性中引用。该模型定义了数量及其对应单位，并提供替代单位及转换方法； b) 新增关于“精度”（ValuePrecision）属性的规则： - 该属性也可用于其他子类型，如时间间隔（Duration）和小数（Decimal）； - 当 ValuePrecision 为负值时，已补充相应规则。 [外文原描述]： IEC 62541-14:2026 defines the PubSub communication model. It defines an OPC UA publish subscribe pattern which complements the client server pattern defined by the Services in IEC 62541-4. See IEC 62541-1 for an overview of the two models and their distinct uses. PubSub allows the distribution of data and events from an OPC UA information source to interested observers inside a device network as well as in IT and analytics cloud systems. This document consists of • a general introduction of the PubSub concepts, • a definition of the PubSub configuration parameters, • mapping of PubSub concepts and configuration parameters to messages and transport protocols, • and a PubSub configuration model. This second edition cancels and replaces the first edition published in 2020. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) Addition of a “Quantity Model” which can be referenced from EngineeringUnit Properties. The model defines quantities and assigned units. In addition it provides alternative units and the conversion to them. b) Addion of rules for ValuePrecision Property: • can also be used for other subtypes like Duration and Decimal. • rules have been added when ValuePrecision has negative values.
英文名称OPC unified architecture - Part 14: PubSub