Qualifiers for Actions in SFC¶

You assign qualifiers to IEC steps. Qualifiers describe how a step action is processed.

Qualifiers are processed by the SFCActionControl function block in the library IecSfc.library. The library is automatically integrated into the project by the SFC plug-in.

Available qualifiers¶
`N`	Non-stored	The action is active as long as the step is active.
`R0`	overriding Reset	The action is deactivated.
`S0`	Set (Stored)	CODESYS executes this action as soon as the step is active. The action is executed until it receives a reset, even if the step has already been deactivated.
`L`	time Limited	CODESYS executes this action as soon as the step is active. The action is executed until the step is deactivated or the given time interval has elapsed.
`D`	time Delayed	CODESYS begins executing the action only after the given delay time has elapsed following step activation and the step is still active. The action is executed until the step is deactivated.
`P`	Pulse	CODESYS executes the action exactly two times: one time when the step is activated and one time when the step is deactivated.
`SD`	Stored and time Delayed	CODESYS begins executing the action only after the given delay time has elapsed following step activation. The action is executed until it receives a reset.
`DS`	Delayed and Stored	CODESYS begins executing the action only after the given delay time has elapsed following step activation and the step is still active. The action is executed until it receives a reset.
`SL`	Stored and time Limited	CODESYS executes this action as soon as the step is active. The action is executed until the given time has elapsed or it receives a reset.

You must enter the times for the L, D, SD, DS, and SL qualifiers in the format of a TIME constant.

Note

When an IEC action is deactivated, it is executed one more time. This means that CODESYS executes this kind of action at least two times. This also applies to actions with the P qualifier.