FUNCTION_BLOCK PUBLIC LCTUD
Increments and decrements a given value
(* Example declaration *)
LCTUDInst : LCUTD ;
(* Example in ST *)
LCTUDInst(CU := VarBOOL1, CD:= VarBOOL2, RESET := VarBOOL3, LOAD:=VarBOOL4 , PV:= VarLWORD1);
VarBOOL5 := CTUDInst.QU ;
VarBOOL6 := CTUDInst.QD ;
VarLWORD2 := CTUDInst.CV ;
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InOut:
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Scope
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Name
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Type
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Comment
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Input
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CU
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BOOL
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Rising edge: Incrementing CV by one
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CD
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BOOL
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Rising edge: Decrementing CV by one
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RESET
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BOOL
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TRUE: Reset CV to 0
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LOAD
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BOOL
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TRUE: Set CV to the start value PV
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PV
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LWORD
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Start value for decrementing / upper limit for incrementing
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Output
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QU
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BOOL
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TRUE if CV >= PV
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QD
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BOOL
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TRUE if CV = 0
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CV
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LWORD
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Current counter value
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