lib/counter.txt
author etisserant
Wed, 31 Jan 2007 15:32:38 +0100
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child 176 bef3cc16c064
permissions -rwxr-xr-x
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(* Following taken directly from the IEC 61131.3 draft standard *)
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(*
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 * An IEC 61131-3 IL and ST compiler.
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 *
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 * Based on the
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 * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
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 *
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 *)
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(*
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 * This is part of the library conatining the functions
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 * and function blocks defined in the standard.
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 *
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 * Counter function blocks
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 * -----------------------
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 *)
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FUNCTION_BLOCK CTU
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  VAR_INPUT
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    CU : BOOL;
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    R : BOOL;
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    PV : INT;
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  END_VAR
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  VAR_OUTPUT
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    Q : BOOL;
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    CV : INT;
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  END_VAR
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  VAR RETAIN
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    PVmax : INT;
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  END_VAR
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  IF R THEN CV := 0 ;
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  ELSIF CU AND (CV < PVmax)
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       THEN CV := CV+1;
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  END_IF ;
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  Q := (CV >= PV) ;
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END_FUNCTION_BLOCK
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FUNCTION_BLOCK CTD
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  VAR_INPUT
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    CD : BOOL;
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    LD : BOOL;
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    PV : INT;
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  END_VAR
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  VAR_OUTPUT
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    Q : BOOL;
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    CV : INT;
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  END_VAR
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  VAR RETAIN
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    PVmin : INT;
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  END_VAR
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  IF LD THEN CV := PV ;
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  ELSIF CD AND (CV > PVmin)
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      THEN CV := CV-1;
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  END_IF ;
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  Q := (CV <= 0) ;
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END_FUNCTION_BLOCK
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FUNCTION_BLOCK CTUD
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  VAR_INPUT
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    CU : BOOL;
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    CD : BOOL;
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    R  : BOOL;
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    LD : BOOL;
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    PV : INT;
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  END_VAR
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  VAR_OUTPUT
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    QU : BOOL;
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    QD : BOOL;
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    CV : INT;
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  END_VAR
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  VAR RETAIN
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    PVmax : INT;
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    PVmin : INT;
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  END_VAR
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  IF R THEN CV := 0 ;
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  ELSIF LD THEN CV := PV ;
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  ELSE
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    IF NOT (CU AND CD) THEN
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      IF CU AND (CV < PVmax)
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      THEN CV := CV+1;
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      ELSIF CD AND (CV > PVmin)
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      THEN CV := CV-1;
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      END_IF;
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    END_IF;
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  END_IF ;
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  QU := (CV >= PV) ;
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  QD := (CV <= 0) ;
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END_FUNCTION_BLOCK
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