Publication 1756-RM084F-EN-P - July 2002
Entering Sequential Function Chart Logic 7-13
STEP example
STEP (ID := 16, X := 420, Y := 360, Operand := LastStep, HideDescription := Yes,
DescriptionX := 474, DescriptionY := 345, DescriptionWidth := 0,
InitialStep := No, PresetUsesExpression := No, LimitHighUsesExpression := No,
LimitLowUsesExpression := No, ShowActions := Yes)
ACTION (ID := 18, Operand := LastAction, Qualifier := N, IsBoolean := No,
PresetUsesExpression := No, IndicatorTag := "")
BODY (LanguageType := STX)
’LastExecuted := 1;
END_BODY
END_ACTION
END_STEP
IndicatorTag
the indicator tag. Enter tag.
Specify:
IndicatorTag :=
tag
PRESET_block
the preset value of the action. If the PresetUsesExpression attribute (above) is Yes, enter a
PRESET block.
The preset block contains a structured text expression that specifies the preset time in
milliseconds for the action. Each line of structured text begins with a single quote (‘).
PRESET (LanguageType := STX)
‘<structured_text>
END_PRESET
BODY_block
the structured text of the action.
The body block uses structured text to define an action. It can contain multiple structured
text statements. Each line of structured text begins with a single quote (‘).
BODY (LanguageType := STX)
‘<structured_text>
END_BODY
Item: Identifies:
Spare Allen-Bradley Parts
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