指定与指定给图形符号的连接节点分类有关的要求，图形符号是功能和产品概念的表示。由于产品与其相应的图形表示之间存在着很强的相关性，因此在计算机辅助系统中，相同的分类原则既适用于产品连接节点的分类，也适用于网络的分类及其图形符号表示。根据IEC指南108，其具有水平标准的状态。

Specifies requirements concerning the classification of connect nodes assigned to graphical symbols, being a representation of functional and product concepts. Due to the strong interrelation between the product and its corresponding graphical representation, identical classification principles are applied for both the classification of connect nodes of products as well as for the classification of networks and their representation by graphical symbols in computer-aided systems. It has the status of a horizontal standard in accordance with IEC Guide 108.