还可以参考：
如何使用间接寻址访问I/O地址区，当使用SFC20时应注意什么
http://www.ad.siemens.com.cn/download/searchResult.aspx?searchText=%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8%e9%97%b4%e6%8e%a5%e5%af%bb%e5%9d%80%e8%ae%bf%e9%97%aeI%2fO%e5%9c%b0%e5%9d%80%e5%8c%ba%ef%bc%8c%e5%bd%93%e4%bd%bf%e7%94%a8SFC20%e6%97%b6%e5%ba%94%e6%b3%a8%e6%84%8f%e4%bb%80%e4%b9%88


当使用SFC20 “BLKMOV”，SFC81“UBLKMOV”或SFC21“FILL”块时应注意些什么？
http://www.ad.siemens.com.cn/download/searchResult.aspx?searchText=%e5%bd%93%e4%bd%bf%e7%94%a8SFC20+%e2%80%9cBLKMOV%e2%80%9d%ef%bc%8cSFC81%e2%80%9cUBLKMOV%e2%80%9d%e6%88%96SFC21%e2%80%9cF