西门子的帮助文件


https://support.automation.siemens.com/CN/llisapi.dll?func=cslib.csSearch&objaction=cssearch&lang=zh&siteid=cseus&query=&query2=%e5%a6%82%e4%bd%95%e5%90%8c%e6%ad%a5%e6%93%8d%e4%bd%9c%e9%9d%a2%e6%9d%bf%e4%b8%8eS7-200/300/400%20%e6%8e%a7%e5%88%b6%e5%99%a8%e9%97%b4%e7%9a%84%e6%97%a5%e6%9c%9f%e5%92%8c%e6%97%b6%e9%97%b4&content=adsearch%2Fadsearch%2Easpx