dl-breadcrumbs__homedl-breadcrumb-item__separator配置和编程dl-breadcrumb-item__separator编程与 CODESYSdl-breadcrumb-item__separator...dl-breadcrumb-item__separatorCODESYS Development Systemdl-breadcrumb-item__separator参考资料、编程dl-breadcrumb-item__separator操作符dl-breadcrumb-item__separatorOperator '__ISVALIDREF'
dl-pagination__prev-inactivedl-pagination__prev-activedl-pagination__next-inactivedl-pagination__next-active
Operator '__ISVALIDREF'dl-permalink__symbolPermalink

该操作符是 IEC 61131-3 标准的延伸。

该运算符用于检查引用是否指向有效值。有关使用说明和示例，请参阅‎REFERENCE‎ 数据类型的说明。