DoubleToWord, Double to word conversion

Questo blocco funzione permette di convertire una variabile DWORD in due variabili WORD. I 16 bits alti di In verranno trasferiti nell'operando MSW, i 16 bits bassi verranno trasferiti nell'operando LSW.

Descrizione

Parametro	Tipo	Descrizione
In	D_WORD	Variabile da convertire.
MSW	WORD	MSW del valore in ingresso.
LSW	WORD	LSW del valore in ingresso.

Esempi

Come utilizzare gli esempi.
Nell'esempio una variabile DWORD con valore 16#12345678 è trasferita in due variabili WORD che avranno valore 16#1234 e 16#5678.

LogicLab (Ptp114, IL_DoubleToWord)

PROGRAM IL_DoubleToWord
VAR
    High :  WORD; (* MSW word *)
    Low :  WORD; (* LSW word *)
    DData : DWORD := 16#12345678; (* Double word data *)
    DDec : DoubleToWord; (* Double decompress *)
END_VAR

(* ************************************************************************** *)
(* PROGRAM "IL_DoubleToWord"                                                  *)
(* ************************************************************************** *)
(* This program shows the use of DoubleToWord function block.                 *)
(*  ------------------------------------------------------------------------- *)

    LD  DData
    ST  DDec.In (* Transfer the variable to input *)

   	CAL DDec (* Call the function block *)

    LD  DDec.MSW
    ST  High (* Transfer the MSW output to variable *)

    LD  DDec.LSW
    ST  Low (* Transfer the LSW output to variable *)
    
(* [End of file] *)

LogicLab (Ptp114, ST_DoubleToWord)

PROGRAM ST_DoubleToWord
VAR
    DData : DWORD := 16#12345678; (* Double word data *)
    High : ARRAY[ 0..1 ] OF WORD; (* MSW word *)
    Low : ARRAY[ 0..1 ] OF WORD; (* LSW word *)
    DDec : DoubleToWord; (* Double decompress *)
END_VAR

// *****************************************************************************
// PROGRAM "ST_DoubleToWord"
// *****************************************************************************
// This program shows the use of DoubleToWord function block.
// -----------------------------------------------------------------------------

    // -------------------------------------------------------------------------
    // DECOMPRESS DWORD
    // -------------------------------------------------------------------------
    // Decompress word using the FB.

    DDec(In:=DData);
    High[0]:=DDec.MSW; //MSW word
    Low[0]:=DDec.LSW; //LSW word

    // -------------------------------------------------------------------------
    // DECOMPRESS DWORD
    // -------------------------------------------------------------------------
    // The same operation as above executed directly using ST statements.

    High[1]:=TO_WORD(DData/16#10000); //MSW word
    Low[1]:=TO_WORD(DData); //LSW word

// [End of file]