mux4

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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 four integer inputs.

Inputs

Input	Data Type	Range	Unit	Default	Description
K	DINT	0, 3	N/A	No default	Selection command.
IN0	ANY	Depends on the Data Type.	N/A	No default	First input.
IN1	ANY	Depends on the Data Type.	N/A	No default	Second input.
IN2	ANY	Depends on the Data Type.	N/A	No default	Third input.
IN3	ANY	Depends on the Data Type.	N/A	No default	Last input.

Outputs

Output	Data Type	Range	Unit	Description
Q	ANY	No range	N/A	IN0 or IN1 ... or IN3 depending on K. See the Truth Table.

Output

Data Type

Range

Unit

Description

ANY

No range

N/A

IN0 or IN1 ... or IN3 depending on K.

See the Truth Table.

Remarks

None

Truth Table

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

FBD Language Example

FFLD Language Example

In the FFLD "Free Form Ladder Diagram" Language, the input rung (EN) enables the selection.
- The output rung keeps the state of the input rung.
- The selection is performed only if EN is TRUE.
- ENO has the same value as EN.

IL Language Example

In the 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.

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 Example

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