ByteToBit, Byte to bit conversion

This page is part of the IEC 61131-3 Programming Manual. Go to the index.

This function block allows you to convert a variable BYTE in 8 variables BOOL. The status of each bit of the input variable is transferred to the respective variable BOOL of exit.

Function lock
CODESYS: Not available
LogicLab: eLLabUtyLib

In (BYTE) Value to be converted.

b0 (BOOL) 0 bit of the BYTE di In.

b... (BOOL) Bit ... del BYTE di In.

b7 (BOOL) 7 bit of the BYTE di In.

Examples

How to use the examples.
In the example 8 variables BOOL they are transferred to a variable BYTE, in the state of each IBit corresponds the relative bit in the variable OByte.

LogicLab (Ptp114) LogicLab (Ptp114) LogicLab (Ptp114)

LogicLab (Ptp114)

PROGRAM FBD_ByteToBit
VAR
    BDec : ByteToBit; (* Byte decompress *)
    IByte : BYTE; (* Input byte *)
    OBit : ARRAY[ 0..7 ] OF BOOL; (* Output bits *)
END_VAR

LogicLab (Ptp114)

PROGRAM IL_ByteToBit
VAR
    BDec : ByteToBit; (* Byte decompress *)
    IByte : BYTE; (* Input byte *)
    OBit : ARRAY[ 0..7 ] OF BOOL; (* Output bits *)
END_VAR

(* ************************************************************************** *)
(* PROGRAM "IL_ByteToBit"                                                     *)
(* ************************************************************************** *)
(* This program shows the use of ByteToBit function block.                    *)
(*  ------------------------------------------------------------------------- *)

    (* ---------------------------------------------------------------------- *)
    (* DECOMPRESS BYTE                                                        *)
    (* ---------------------------------------------------------------------- *)
    (* Execute the FB. *)

    LD  IByte (* Input byte *)
    ST  BDec.In
    CAL BDec (* Call the function block *)

    (* Store the result. *)

    LD  BDec.b0
    ST  OBit[0] (* Output bits *)

    LD  BDec.b1
    ST  OBit[1] (* Output bits *)

    LD  BDec.b2
    ST  OBit[2] (* Output bits *)

    LD  BDec.b3
    ST  OBit[3] (* Output bits *)

    LD  BDec.b4
    ST  OBit[4] (* Output bits *)

    LD  BDec.b5
    ST  OBit[5] (* Output bits *)

    LD  BDec.b6
    ST  OBit[6] (* Output bits *)

    LD  BDec.b7
    ST  OBit[7] (* Output bits *)

(* [End of file] *)

LogicLab (Ptp114)

PROGRAM ST_ByteToBit
VAR
    IByte : BYTE; (* Input byte *)
    OBit : ARRAY[ 0..1, 0..7 ] OF BOOL; (* Output bits *)
    BDec : ByteToBit; (* Byte decompress *)
END_VAR

// *****************************************************************************
// PROGRAM "ST_ByteToBit"
// *****************************************************************************
// This program shows the use of ByteToBit function block.
// -----------------------------------------------------------------------------

    // -------------------------------------------------------------------------
    // DECOMPRESS BYTE
    // -------------------------------------------------------------------------

    BDec(In:=IByte);
    OBit[0,0]:=BDec.b0; //Output bits
    OBit[0,1]:=BDec.b1; //Output bits
    OBit[0,2]:=BDec.b2; //Output bits
    OBit[0,3]:=BDec.b3; //Output bits
    OBit[0,4]:=BDec.b4; //Output bits
    OBit[0,5]:=BDec.b5; //Output bits
    OBit[0,6]:=BDec.b6; //Output bits
    OBit[0,7]:=BDec.b7; //Output bits

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

    OBit[1,0]:=TO_BOOL(IByte AND 16#01); //Output bits
    OBit[1,1]:=TO_BOOL(IByte AND 16#02); //Output bits
    OBit[1,2]:=TO_BOOL(IByte AND 16#04); //Output bits
    OBit[1,3]:=TO_BOOL(IByte AND 16#08); //Output bits
    OBit[1,4]:=TO_BOOL(IByte AND 16#10); //Output bits
    OBit[1,5]:=TO_BOOL(IByte AND 16#20); //Output bits
    OBit[1,6]:=TO_BOOL(IByte AND 16#40); //Output bits
    OBit[1,7]:=TO_BOOL(IByte AND 16#80); //Output bits

// [End of file]

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