MUX8PLCopen motion icon

FunctionClosedA 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 - 8 inputs.

Inputs

SELECT : DINT Selection command
IN1    : ANY  First input
IN2    : ANY  Second input
...    :
IN8    : ANY  Last input

Outputs

Q : ANY       IN1 or IN2 ... or IN8 depending on SELECT (see truth table)

Truth table

SELECT Q

0

IN1

1

IN2

2

IN3

3

IN4

4

IN5

5

IN6

6

IN7

7

IN8

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 ILClosed"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 := MUX8 (SELECT, IN1, IN2, IN3, IN4, IN5, IN6, IN7, IN8);

FBD Language

Mux8Fbd.gif (1878 octets)

FFLD Language

(* the selection is performed only if EN is TRUE *)
(* ENO has the same value as EN *)
Mux8Ld.gif (2182 octets)

IL Language

Not available

Op1: LDClosed"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
     MUX8 IN1, IN2, IN3, IN4, IN5, IN6, IN7, IN8
     ST   Q

See also

SEL   MUX4