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SFC Element: Action

Symbol: _cds_icon_sfc_action.png

An action includes one or more statements in one of the valid implementation languages. You can assign an action to a ⮫ “SFC Elements: Step and Transition ”.

Actions that you use in SFC steps have to be created as POUs in the project.

_cds_img_sfc_element_action.png

Exception: In the case of IEC actions, which you add to a step as action association, you can also specify a Boolean variable instead of an action object. The value of these variables is switched between ‎FALSE‎ and ‎TRUE‎ each time the "action" is executed.

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You have to define unique step names within the scope of the "parent" POU. An action written in SFC must not contain a step with a name identical to the step to which the action is assigned.

There are "IEC actions" and "step actions".

  • IEC actions
  • Step actions
  • Difference between IEC actions and step actions