NEW BLOCK IN ISAGRAF3.35

[tharun]

Hi everyone,

Do anyone know about  the source code of a selector block in isagraf 3.35.The inbuilt selector block has integer as a input, but i want the input to be real, so I'm customizing a new block, but not sure how to write the source code .Can you guys help me out?

[BevanWeiss]

IF Sel THEN

  Output := Input1;

ELSE

  Output := Input0;

END_IF

Or do you mean you want the 'selector' to be a REAL?

I can't imagine what that would mean...

[tharun]

Hi Bevan,

               Sorry that you didn't understand the previous question. There is an inbuilt selector block in Isagraf which accepts only integer as its input, but i want the same selector block to get an input as a real value, since there is no such inbuilt block, I have to create a new block, so i did create it. But not sure about source code(which can be ladder, FBD, C), Source code means the way that the selector block had to perform the function. I have attached the selector block image for your reference.

Thanks,

[BevanWeiss · Accepted solution]

The image you've attached shows the sel block to take 3 (THREE) inputs.

One Boolean (sel)

Two Integers (in1 and in2)

In called the two inputs as Input0 and Input1, which I think aligns better to the 'sel' input values... but you can call them what you want.

The output could be called output (as I did) or Q if you'd like (I generally consider Q to be a Boolean output..)

You shouldn't go down the path of C, it's too tricky for a function block in ISaGRAF.  Stick with FBD or ST (which are both IEC61131-3 languages available in ISaGRAF).