嗯,你可以在:
http://support.automation.siemens.com/CN/llisapi.dll?query=CP343-1CX10-0XE0++V2.3&func=cslib.cssearch&content=adsearch%2Fadsearch.aspx&lang=zh&siteid=cseus&objaction=cssearch&searchinprim=&nodeid99=
下载到2.3版本.

如果你需要该型号的2.4版本,你可以在:
http://support.automation.siemens.com/CN/llisapi.dll?query=CP343-1CX10-0XE0+&func=cslib.cssearch&content=adsearch%2Fadsearch.aspx&lang=zh&siteid=cseus&objaction=cssearch&searchinprim=&nodeid99=&x=29&y=8
下载到2.4版本.