MUX4

Function A function calculates a result according to the current value of its inputs. A function has no internal data and is not linked to declared instances. - Select one of the inputs - 4 inputs.

Inputs

Inputs	Data Type	Description
K	DINT	Selection command.
IN0	ANY	First input.
IN1	ANY	Second input.
IN2	ANY	Third input.
IN3	ANY	Last input.

Outputs

Output	Data Type	Description
Q	ANY	IN0 or IN1 ... or IN3 depending on K. See Truth Table.

Truth Table

K	Q
0	IN0
1	IN1
2	IN2
3	IN3
Other	0

Remarks

• In FFLD language, the input rung (EN) enables the selection.
  • The output rung keeps the state of the input rung.
• In IL "Instruction list" This is a low-level language and resembles assembly language, the first parameter (selector) must be loaded in the current result before calling the function.
  • Other inputs are operands of the function separated by comas.

FBD Language

FFLD Language

(* the selection is performed only if EN is TRUE. *)
(* ENO has the same value as EN. *)

IL Language

Op1: LD "Ladder diagram"
Ladder logic is a method of drawing electrical logic schematics. It is now a very popular graphical language for programming Programmable Logic Controllers (PLCs). It was originally invented to describe logic made from relays. The name is based on the observation that programs in this language resemble ladders, with two vertical "rails" and a series of horizontal "rungs" between them   SELECT
     MUX4 IN1, IN2, IN3, IN4
     ST   Q

ST Language

Q := MUX4 (K, IN0, IN1, IN2, IN3);

See Also

• MUX8
• SEL