Hi,

I have two I/O field on my hmi, i must to condition a field the other, max difference between values accepted is 2.

For example, i set for first I/O field value 15, in this case, for second i/o field i can set just first i/o field value +/- 2 and result 13....17.

And vice versa.

how can i do that?

(i can`t attach my project here, is too big.)

If your HMI supports scripting, then this is easy.  Look for change of I/O 1 and execute script to change I/O 2.

If not, then it needs to be done in PLC and is quite a bit more difficult. Need to do change detection and update in your code.

tnx for hint, today, workday is finish.

I try again next week, and i return with feedback.

Use separate MIN - MAX limits for each tag, calculation of tags done by PLS.

No scripting necessary in that case.

To restate your question as I under stand it:

When you change either the min or max limit you want the other limit to be set within +/-2 

 We can do this easily in an SCL program block:

I used the spelling from your screen shot for the tag names.

//If the min limit is changed then we want to adjust the max

IF NOT ("calibrareMin" = "calibrareMinLastScan") THEN

    //make sure the max tag is within the limit

    IF "calibrareMax" > "calibrareMin" + 2 THEN

        "calibrareMax" := "calibrareMin" + 2;

    ELSIF "calibrareMax" < "calibrareMin" - 2 THEN

        "calibrareMax" := "calibrareMin" - 2;

    END_IF;

    

//if the max limit is changed then we want to adjust the min

ELSIF NOT ("calibrareMax" = "calibrareMaxLastScan") THEN

    //make sure the min tag is within the limit

    IF "calibrareMin" > "calibrareMax" + 2 THEN

        "calibrareMin" := "calibrareMax" + 2;

    ELSIF "calibrareMin" < "calibrareMax" - 2 THEN

        "calibrareMin" := "calibrareMax" - 2;

    END_IF;

END_IF;

//capture values at this scan for change detection

"calibrareMinLastScan" := "calibrareMin";

"calibrareMaxLastScan" := "calibrareMax";