4Tian D, Guo F, Liu S, et al. A wind-tunnel test on the entirety model of the concentrated wind energy turbine (Report NO. N A comp arative test of power generation)[A]. Perpr. for the Beijing International Conference on Wind Energy[C], May 9-3, 1995. C--76-C--85.
5廖常初.S7-200 PLC基础教程[M]{H}北京:机械工业出版社,2009.
6SIEMENS AG. SIMATIC S7-200 Program mable Controller System Manual[M].2007.