MUX4

FunctionA 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

SELECT : DINT Selection command
IN1    : ANY  First input
IN2    : ANY  Second input
...    :
IN4    : ANY  Last input

Outputs

Q : ANY       IN1 or IN2 ... or IN4 depending on SELECT (see truth table)

Truth table

SELECT	Q
0	IN1
1	IN2
2	IN3
3	IN4
other	0

Remarks

In FFLD language, the input rung (EN) enables the selection. The output rung keeps the same state as 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.

ST Language

Q := MUX4 (SELECT, IN1, IN2, IN3, IN4);

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

See also

SEL   MUX8