Thanks for your reply.
Original PLC is working without problems. I wanted to make a backup. There are no problems to make upload from other machines (about 10). By Synchronize (from PLC) I see message: emty rungs. Maybe some protection from supplier?
Yes, I know it. But I need make it in FB ( It is onpy example. It will be more comlex function with start address as parameter - I will set start address on input FB and fuction use address space from it.)