Action qualifiers for SFC elements
The action qualifier (maybe also known as qualifier) controls an →action with the →SFC network. Hence, the action qualifier determines
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when the statements of an action should be executed or
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which value the enclosed Boolean variable (Boolean action) receives.
The usage of the action qualifier depends on the used programming language:
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Within the ST-editor, the action qualifier is specified when associating the action within the step or initial step. The statements of the action are specified within the action.
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Within the FBD-editor, the action qualifier is entered within an action block. The statements for the action follow this action block.
Neuron Power Engineer provides the following action qualifiers (AQ):
AC |
Description |
Short explanation on the effect (1) |
Duration(2) |
|
---|---|---|---|---|
(none) |
Non-stored |
such as |
|
|
|
Non-stored |
action is active (= delivering |
|
|
|
overriding Reset |
resetting or interlocking the action; has priority over other action qualifiers |
|
|
|
Set (or Stored) |
delivering |
|
|
|
time Limited |
delivering |
|
|
|
time Delayed |
delivering |
|
|
|
Pulse |
delivering |
|
|
|
Stored and time Delayed |
delivering |
|
|
|
Delayed and Stored |
setting action (stored) after the set time has elapsed but only if the internal input has been continuously active |
|
|
|
Stored and time Limited |
delivering |
|
|
|
Pulse, falling edge |
such as block |
|
|
|
Pulse, rising edge |
such as |
|
|
|
Pulse, Non-stored |
delivering
|
|
Legend:
(1) ... See "Evaluating SFC elements" and "Behavior of the action qualifiers for SFC elements" for a better understanding how one/several action qualifiers affect the evaluation of the ST-code or the FBD-logic.
(2) ... In case of , you have to specify a duration literal of data type TIME
or a variable of data type TIME
for this action qualifier (see →Time literal for examples on duration literals). In case of , a duration literal is not required for this action qualifier.