FUnction Block calling in ST

2020-02-27T22:19:37.929000Z

ok i have discovered

To call the FB in ST it need to use the name of the instance and then pass the parameters

2020-02-27T22:19:36.366000Z

hi to everybody .

I would like to understand the following thing , i have a simple program i'm starting just now with the fantastic codesys .

In my program i have :

1) Main -Prg ----> Structured text

2) FB1 ----> Structured text

The FB1 is simple , it only has 2 input parameter declared in its table

ADD1-----INT

ADD2-----INT

and 1 output parameter

SUM ------INT

Difficult to understand that this FB get 2 integer numebers and calculate the sum and return it at output parameter .

Up to now doesn't matter .

In the Main-Prg i want to call this FB1 .

So i write

FB1(ADD1:=2,ADD2:=2,SUM=>myINT) ; //myINT is declared in the table as VAR .

In the VAR table of Main-Prg i declare also the instance for FB1 as follow:

DB_FB1 ---- FB1 .

I compile all but an event occours .

Normally , in the SCL (ST in simatic system) , when i call an FBxx i write

dot "name of instance like this ----- FB1.DB_FB1(........,....,,....);

But codesys doesn't like of course.

If i use an other language in Main-Prg it's so easy to write the instance over the box , but in ST i don't understand what to do ....

Can somebody tell me the right solution ?

Thanks so much

Walter

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