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在Application > Tags编辑器中存在一些预定义的Tag，可以直接使用，例如‘LanguageCode’可以用来实现语言切换。
There are two ways to create HMI Tags from controller variables:
AI895 3BSC690089R1 assigns HMI Tag to global IEC 61131-3 variables;
For local variables in function blocks and program POUs, select the HMI checkbox in the variable attribute table, and all instances of POUs will expose the local variables as HMI Tags.
The local AI895 3BSC690089R1 Tag is only visible to one HMI client (HMI client refers to the browser accessing eHMI). If a local HMI tag changes, the change will only affect the tag of a specific client. The local HMI Tag includes the following three types:
AI895 3BSC690089R1 is specific to only one client, but is shared across all HMI pages.
There are some predefined tags in the Application>Tags editor that can be used directly, such as' LanguageCode 'which can be used to achieve language switching.
咨询：AI895 3BSC690089R1 只对一个HMI客户端HMI客户端
