Add a ladder diagram rung to a routine
    Add a rung to a routine so that you can add branches and instructions to the rung. 
Prerequisites
To add a ladder diagram rung to a routine
- In the Ladder EditorToolbox, drag a rung to the canvas of the routine. Valid drop zones are indicated by to the canvas of the routine. Valid drop zones are indicated by .
            TIP: IfToolboxis not visible, on the panebar, select .
            TIP: IfToolboxis not visible, on the panebar, select Toolbox. Toolbox.
- TIP: Open the code editor to edit a ladder diagram rung in the Code Editor. For assistance, see Ladder routine structure and Ladder routine example
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