Along with the simplified steps the standard IEC steps in SFC are available.
In order to be able to use IEC steps, you must link the special SFC library lecsfc.lib into your project.
Not more than nine actions can be assigned to an IEC step. IEC actions are not fixed as input, step or output actions to a certain step as in the simplified steps, but are stored separately from the steps and can be reused many times within a POU. For this they must be associated to the single steps with the command 'Extras''Associate action'.
Along with actions, Boolean variables can be assigned to steps.
The activation and deactivation of actions and boolean variables can be controlled using so-called qualifiers. Time delays are possible. Since an action can still be active, if the next step has been processed, for example through the qualifier S (Set), one can achieve concurrent processes.
An associated boolean variable is set or reset with each call of the SFC block. That means, that at each call the variable gets re-assigned value TRUE resp. FALSE.
The actions associated with an IEC step are shown at the right of the step in a two-part box. The left field contains the qualifier, possibly with time constant, and the right field contains the action name respectively boolean variable name.
Along with the simplified steps the standard IEC steps in SFC are available.
In order to be able to use IEC steps, you must link the special SFC library lecsfc.lib into your project.
Not more than nine actions can be assigned to an IEC step. IEC actions are not fixed as input, step or output actions to a certain step as in the simplified steps, but are stored separately from the steps and can be reused many times within a POU. For this they must be associated to the single steps with the command 'Extras''Associate action'.
Along with actions, Boolean variables can be assigned to steps.
The activation and deactivation of actions and boolean variables can be controlled using so-called qualifiers. Time delays are possible. Since an action can still be active, if the next step has been processed, for example through the qualifier S (Set), one can achieve concurrent processes.
An associated boolean variable is set or reset with each call of the SFC block. That means, that at each call the variable gets re-assigned value TRUE resp. FALSE.
The actions associated with an IEC step are shown at the right of the step in a two-part box. The left field contains the qualifier, possibly with time constant, and the right field contains the action name respectively boolean variable name.
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