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To create "Trigger" click on " 
" inside "System tree" menu.
Click on the "Trigger". You will see a picture.
Enter a name for the created trigger. If necessary, select the inversion.
Click "OK" to create a trigger.
Editing trigger possible in inside the system structure "System tree" menu.
When you edit a trigger, in addition to standard control functions virtual elements and functions are available:
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