Hello MAGED MORIS,
WinCC is communicating with the PLC and the PLC is executing the commands to the Siwarex U module.
That means we have to know how your Step7 program is working.
How are you executing the commands?
Are you using the entire Step7 program of the first posting from ABenno?
If I know your Step7 program I can tell you what you have to do into WinCC.