S7-1200视频教程: S7-1200的功能与特点-跟我学 - 1/112
观看连接:
http://www.elearning.siemens.com.cn/video/Course/201012/c1-3-stu.swf
http://www.ad.siemens.com.cn/service/elearning/videoList_32_0_____0_0_1.html