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Design Methods on Sequential Control System
Abstract: The sequential control is widely applied in industry control .To desige sequential control system by PLC sequential control method is the paper propose . User¡¯s control program is compiled by SFC(Sequential Function hart) and LD(Ladder Diagram) to realizing sequential control on singled eviceor production process. This paper expounds basic elements of sequential function chart£¬basic rule for implement of transition in sequential function chart. Three kinds of design method on PLC sequential control system are introduced£ºthe first is the desige in state chart . the second is the design in set/reset instructions£¨S/R£©. and the third is the design in Step Ladder instructions£¨STL£©. At last this paper gives an example of the machine of press autocontrol with the help of PLC . The exnmple uses the design method in STL£¬provides systematic schematic circuit diagram¡¢diagram of program structure¡¢ function diagram of program`s sequence £¬trapezoidal diagram of the program and the program repertoire£¬to explanat the design steps and the process of the PLC control system.And shows that sequential control design method is an advanced regular design method for design of PLC ladder diagram£¬and it is a powerful tool. It is not only enhance effective and save the time of desige£¬but also is convenience of debuging¡¢revising and reading.
Keywords: PLC£» Sequential control system£» The machine of process autocontrol system