Abstract: This paper describes the application of Siemens S7-300 PLC in a computer monitoring and controlling system of Shen Ma Industrial Co., Ltd boiler,which uses PLC to complete the processing of data collecting, data processing, and the communication between upper computer and PLCs. The paper gives out the hardware structure of the system, the function of the system , especially introduces the way of software programming.Keywords:boiler PLC monitoring and controlling upper computer
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