How to use Function

2021-08-19T09:40:02.128000Z

Thank You.

Effectively it's work much better with FB. Sorry for that.
For naming , I would change it was more for trial purpose and understand how does work. Now I can do it in proper way.

Thank You again.

Regards

How to use Function

2021-08-19T08:41:25.188000Z

hi,

As you might have learned with Algebra, functions don't preserve memory and are state independant. They are purely input dependant. This means that the output of a function is always directly related to the inputs and do not contain any memory states.

example: x = SIN(t)

To use memory states you should use a FUNCTION BLOCK instead of a FUNCTION. Then youre code wil work.

How to use Function

2021-08-19T08:41:19.749000Z

hi,

example: x = SIN(t)

To use memory states you should use a FUNCTION BLOCK instead of a FUNCTION. Then youre code wil work.

How to use Function

2021-08-19T05:50:41.195000Z

sorry I miss some parts of the code!!

code

FUNCTION Rotary_switch_selection : USINT
VAR_INPUT
F_P1pot :USINT;
END_VAR
VAR
F_P1pot_TON1:TON;
F_P1pot_TON2:TON;
F_P1pot_RTRIG:R_TRIG;
F_FunctionCTUD: CTUD;
F_Ppotbis :USINT;
F_Functionup:BOOL;
F_Functiondown:BOOL;
F_VAL2:BOOL;
F_PV1:WORD;
END_VAR

code of the function:

F_P1pot_TON1(IN:= NOT F_P1pot_TON2.Q , pt:=T#0.2S);
F_P1pot_TON2(IN:= F_P1pot_TON1.Q , pt:=T#0.2S);
F_P1pot_RTRIG(CLK:=F_P1pot_TON1.Q , Q=> );

IF F_P1pot_RTRIG.Q THEN
F_Ppotbis:=F_P1pot;
END_IF

IF F_P1pot > F_Ppotbis THEN
F_Functionup:=TRUE;
F_Functiondown:=FALSE;
ELSIF F_P1pot < F_Ppotbis THEN
F_Functionup:=FALSE;
F_Functiondown:=TRUE;
ELSE
F_Functionup:=FALSE;
F_Functiondown:=FALSE;
END_IF

F_FunctionCTUD(CU:= F_Functionup, CD:= F_Functiondown, RESET :=F_VAL2, load:= , PV:=F_PV1);

Rotary_switch_selection := WORD_TO_BYTE (F_FunctionCTUD.CV);


then my main is what I've written above

How to use Function

2021-08-19T05:44:46.065000Z

Hello to all,
I would need some help.

Instead of using PRG, I've tried to use a function

I've fews rotary switchs that I'm trying to count when values change.
So instead of trying to create multiple PRG, the idea was to use a fuction for.

And unfortunaly it doesn't react.
someone has any idea.~~~
code
~~~

then in my "main" to call

PROGRAM Main
VAR
P1value:USINT;
END_VAR

P1value:=Rotary_switch_selection( F_P1pot:=GVL.P1pot );

GVL.P1pot => is my Potentiometer value.

thank you for your help.

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