IEC 62541的这一部分是整个OPC统一体系结构（OPC UA）标准系列的一部分 并定义了与数据访问（DA）相关的信息模型。它尤其包括 数据访问所需的NodeClasses和属性、附加属性以及其他信息和行为的附加变量类型和补充说明。购买本文件时可获得的所有当前修订均包含在购买本文件中。

This part of IEC 62541 is part of the overall OPC Unified Architecture (OPC UA) standard series and defines the information model associated with Data Access (DA). It particularly includes additionalVariableTypesand complementary descriptions of theNodeClassesandAttributesneeded for Data Access, additionalProperties, and other information and behaviour.All current amendments available at time of purchase are included with the purchase of this document.