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Global variables are a kind of special. For all global variables there are function blocks for reading and writing available in every sub-program. These function blocks do always show the variable's name and can't be renamed.

 

Global variables can be added, removed and renamed in the variable manager (main program view). Furthermore, they can be assigned initial values.

Adding, removing and renaming global variables is also possible in the function block library by right-clicking on the device "Variables" and selecting "Add" or right-clicking on the variable's reader or writer and selecting "Remove" or "Rename".