DEMUX

DEMUX is a demultiplexer block. It decomposes one 16-bit word into 16 BOOL output variables.

Ladder Representation

Variable Table

Variable Type	Name	Data Type	Description
VAR_INPUT	EN	BOOL	Enables block execution.
VAR_INPUT	Word	WORD UINT INT	16-bit input variable.
VAR_OUTPUT	ENO	BOOL	Indicates the end of the operation.
VAR_OUTPUT	Bit0–Bit15	BOOL	Bit value from the corresponding position of Word.

Operation

When EN is TRUE, DEMUX decomposes Word into 16 Boolean values and stores them in Bit0 through Bit15.

Bit0 corresponds to the least significant bit (LSB). Bit15 corresponds to the most significant bit (MSB).

When EN is FALSE, the output variables remain unchanged.

ENO passes the EN value to the next Ladder block after the operation finishes.

Execution Flowchart

Examples

Ladder Example

The example decomposes MYWORD into Boolean values and stores them in BIT0 through BIT15. The block finishes successfully and activates ENO.

Structured Text Example

The following Structured Text example applies the same demultiplexing logic.

Structured Text

VAR
    MYWORD : WORD := 45985;
    BIT0 : BOOL;
    BIT1 : BOOL;
    BIT2 : BOOL;
    BIT3 : BOOL;
    BIT4 : BOOL;
    BIT5 : BOOL;
    BIT6 : BOOL;
    BIT7 : BOOL;
    BIT8 : BOOL;
    BIT9 : BOOL;
    BIT10 : BOOL;
    BIT11 : BOOL;
    BIT12 : BOOL;
    BIT13 : BOOL;
    BIT14 : BOOL;
    BIT15 : BOOL;
END_VAR

DO1 := FB_DEMUX(
    EN:=DI1,
    Word0:=MYWORD,
    Bit0=>BIT0,
    Bit1=>BIT1,
    Bit2=>BIT2,
    Bit3=>BIT3,
    Bit4=>BIT4,
    Bit5=>BIT5,
    Bit6=>BIT6,
    Bit7=>BIT7,
    Bit8=>BIT8,
    Bit9=>BIT9,
    Bit10=>BIT10,
    Bit11=>BIT11,
    Bit12=>BIT12,
    Bit13=>BIT13,
    Bit14=>BIT14,
    Bit15=>BIT15);