Structured Text Editor
    Use the Structured Text Editor to create and edit Structured Text routines. The
            Structured Text Editor is a text-based programming language used to create and edit
            control programs as defined by the IEC 61131-3 standard.
The Structured Text Editor displays a tab for each open routine. 
Structured Text Editor

 The online and offline indicators show whether a routine is in online or offline view.
            Select an icon to display the online or offline view. 
- Select the online icon to display the online view. to display the online view.
- Select the offline icon to display the offline view. to display the offline view.
     TIP: 
    In the online view, logic is read-only and you
                cannot edit it.
Use the 
Toolbox
 to insert statements, instructions, and Add-On
            Instructions. Use the 
Go-to-line
 icon to jump to a specific line in the
            routine.Use the scroll bars to display sections of a large routine. Zoom in or out to change the
            size of text in the window.
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