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lib/counter.txt
author Edouard Tisserant
Fri, 01 Apr 2011 11:10:06 +0200
changeset 256 101c7f148b9a
parent 176 bef3cc16c064
child 257 90782e241346
permissions -rwxr-xr-x
Changed packing declaration in iec_types
0
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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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  IF R THEN CV := 0 ;








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  ELSIF CU AND (CV < PV)








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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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  IF LD THEN CV := PV ;








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  ELSIF CD AND (CV > 0)








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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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  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 < PV)








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      THEN CV := CV+1;








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      ELSIF CD AND (CV > 0)








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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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