MUX

Multiplexer — selects one of several inputs by index.

Signature

     ┌─────────┐
  K ─┤         │
IN0 ─┤         │
IN1 ─┤   MUX   ├─ OUT
IN2 ─┤         │
... ─┤         │
     └─────────┘

FUNCTION MUX : ANY
  VAR_INPUT
    K   : INT;
    IN0 : ANY;
    IN1 : ANY;
    (* ... up to IN15 ... *)
  END_VAR
END_FUNCTION

The return type matches the input type. All INn inputs must share the same type. MUX is polymorphic over any data type.

Inputs

Name

Type

Description

K

ANY_INT

Zero-based selector. Selects which input is returned.

IN0, IN1, …, INn

ANY

The candidate values. The number of inputs matches the value range of K (2 to 16). All inputs must share the same type.

Outputs

Name

Type

Description

Return value

ANY

The input selected by K. Same type as the INn inputs.

Description

MUX(K, IN0, IN1, ...) returns the input selected by the zero-based index K. The number of inputs is variable, and all inputs must be the same type.

  • If K = 0, returns IN0

  • If K = 1, returns IN1

  • And so on

If K is out of range, the value is clamped: negative K selects IN0, and K greater than or equal to the number of inputs selects the last input. Supports 2 to 16 input values.

This function is polymorphic: it works with any data type for the selected inputs.

Example

result := MUX(0, 10, 20, 30);    (* result = 10 *)
result := MUX(2, 10, 20, 30);    (* result = 30 *)

See Also

  • SEL — binary selection (two inputs)

  • LIMIT — clamp to range

References