3Roger M. Cooke, Atze Bosma, Frank Hearte . A practical model of Heinekens bottle filling line with dependent failures [J]. Europe- an Journal of Operational Research, 2005, 169. 491 - 504.
4VITTURI S. Stochastic model of the profibus- DP cycle time [J]. Science. Measurement and Technology, 2004, 151. 335 - 342.
5西门子通用变频器应用实例手册[z].2007.
6西门子位控模块EM253快速入门.2005.
7Haval K . Schemes to predigest the number of PLC input or output [J]. Meachanical and Electrical Engineering, 2000, 26. 19-21.
8Simosi. A . The method of improvitlg the efficiency of PLC [J]. Mechanism Manufacture. and Automatization , 2002 , 46, 27 -29.