How to make a custom function in my rapid program?

laov

Can I make myself a function the same way I make a procedure in RAPID programming? If yes then what is the proper syntax for it?

RStevens

Here is an simple example.

FUNC num abs_value(num value)

  IF value<0 THEN

    RETURN -value;

  ELSE

    RETURN value;

  ENDIF

ENDFUNC

 

gr,

RStevens

Here is an example of a simple function. FUNC num abs_value(num value) IF value<0 THEN RETURN -value; ELSE RETURN value; ENDIF ENDFUNC gr, Richard

laov

Thanks, I didn't declare the function type

kentz

Hi, Just wondering how can you make the custom functions global? Do you need to declare in a header file or something and include the header file in your main?

Regards

Kent

Micky

Hi,

all procedures, functions and data declarations are defined as global in a Task if the argument "LOCAL" is not used.

Examples for global declarations:

CONST num nMyNum:=1;

PROC MyProc()

FUNC num MyFunc()

 

Examples for local declarations in a module:

LOCAL CONST num nMyNum:=1;

LOCAL PROC MyProc()

LOCAL FUNC num MyFunc()

 

If you are using a persistant data declaration, you have the following possibilties

PERS num nMyNum:=0;    (Persistant is defined as global for all tasks, in case of same declaration is available in the other tasks

LOCAL PERS num nMyNum:=0; (Persistant is only available in the module)

TASK PERS num nMyNum:=0; (Persistant is global in the current task)

Regards

Micky