This paper describes the background of the completion of the PLC control system of Chengdong Water Plant and the problems existing in the current use.The old automatic control system is upgraded and reformed.SIMATIC S7 Si-emens PLC controller is selected to replace the old Schneider Kunten series and M340 series PLC,optimize the control program,and add the control point of the upper computer.Increasing the communication between some end stations and main stations enhances the operability of the whole water plant,and provides a reference for the PLC transformation and the new water plant PLC automatic control system.
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