Symbol: 
Function: This command assigns an IEC action to a step.
Call: Main menu “SFC”
Requirement: A step is selected.
CODESYS inserts the action element to the right of the selected step element.
If you have already assigned one or more actions to the step, they are displayed in an action list. The new action is then inserted as follows:
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If you selected the step element, the action is inserted as the first action of the step at first position of the action list.
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If you selected one of the available actions in the action list, then the action is inserted directly above the selected action.
The left section of the action element includes the qualifier (N by default). You enter the action name in the right section. To set this value, click
in the box to obtain an editing frame. You must have already created this action as
a POU in the project.
You can also edit the qualifier. Valid qualifiers are described in the chapter “Qualifiers for Actions in SFC".