《S7-200与丹佛斯变频器通过
modbus通讯》连接:
http://www.docin.com/p-37722650.html
http://www.gongkong.com/webpage/solutions/201010/2009071017220100001.htm
《DANFOSS 变频器与
modbus RTU》下载:
http://www.gzyydz.com/UserPhoto/Mondbus%20RTU%5B1%5D.pdf
参见《S7-200通过自由口控制
modbus变频器正负转 频率写入 等》连接:
http://www.gongkong.com/webpage/forum/200903/2009030208464900002-1.shtml