Thank you @Pittiplatsch. That was really helpful.

Do you have a link on communication between two scalances W. One as server and the other as client. one connected to the server CP243-1 and the other to the client CP243-1.

please 

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Split from Communication between two old simatic step 7 PLC's S7-200 via cp 243-1 and cp 243-1 IT.

Hello,

one SCALANCE W is access Point, the other will be WLAN-Client.

Connect both and create a WLAN by creating SSID and Channel. The communication is still "Ethernet". So there is no more configuration in CPs necessary.

(Only if you communicate PROFINET via WLAN; but S7-200 do not support Real-Time with RPOFINET).