Hi,

It's hard to help searching for problems in a program that is not your own. 

Here are some links about symbolic addressing:

Programming Guideline for S7-1200/S7-1500

See chapter 3.6

What are the advantages of using symbolic addressing for S7-1500 in STEP 7 (TIA Portal)?

Best regards,

Wizard

Hi,

I have not seen in your screenshots the definition of the array

FGDB_020XDG003@AddOn.Linienabbild[]

to know the upper and lower bounds of that array.

Hello and thank you for the replies.

@Wizard, thank you for the links. I have received this project as is so tried to figure this out in the simulation.

Kahl, your suggestion was very helpful, I have found that Linienabbild array is defined with limits 17 and 28. So that is the reason why the problem was solved when index was initialized to 28. 

Thanks once again for your help-