PSI Bluetooth Converter for S7-400

well... if you get the Data the way the PLC requires it, sure. I think for preparing STRING values you will have to do some programming in JAVA with Beans. otherwise the PLC may not understand it. The STRING value is a bit special with SIMATIC. But if you care about it... why not.

For some information about WLAN units in industrial environments this link might be useful:

SIMATIC NET WLAN

Best regards