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A global variable list is used for the declaration, editing and display of global variables.

A GVL is added to the application or the project with the command “Project  Add Object  Global Variable List”.

If you insert a GVL under an application in the Device tree, the variables are valid within this application. If you add a GVL in the ‎POUs‎ view, the variables are valid for the entire project.

You can apply settings for the editor of the object in the dialog “Tools  Options” in the categories “Declaration Editor” and “Text Editor”.

If the target system supports network functionality, you can convert the variables of a GVL into network variables and thus use them for data exchange with other devices in the network. To do this you must define corresponding properties for the GVL in the “Network Variables” tab of the “Properties” dialog.