This message does not give what you ask, but may still be helpful.

Automatic STL to LAD conversion is not available for the S7-1500. But it is available for the S7-300. Break the code you are inspecting into smaller portions. Then copy the pieces over to an S7-300 project. Then you can ask Step7 (TIA Portal) to do the conversion for you.

You can also move from LAD to STL in the same way if an S7-300 CPU project is used. Then again you can view STL and compare to what you have.

now you have some technique to sort out the queries by yourself. Else if you still ask for help, may I suggest that you put the text of the STL in a TXT file. It makes it easier to make some edits from that an not have to type texts over. Or better if you have a sample project with code blocks with your STL and LAD versions.

Good luck.

Thanks for the tip but I have already tried to convert it with Step7 and, even if divided in smaller parts, it doesn't convert

With the simple parts like comparisons etc. it works but when I tried with others (to understand the logical order of the brackets) it didn't convert and simply always showed me the AWL language.

However as suggested I attach the script in a txt file to facilitate the modifies.

Thank you very much for the time you spended.

So glad it's correct