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This paper presents an intelligent monitoring system of manufacturing process in CNC machine tools through the Internet in order to improve the production process control. The monitoring system, based on SINUMERIK 840D is developed with the function of real-time data acquisition, storage and management, statistics and analysis. By means of the HMI Programming Package, an OEM development kit provided by Siemens, the machine data acquisition program is developed to read the bottom layer NC/PLC variables, such as NC program, cutting speed, spindle speed, alarm, etc., which are sent to the server through RJ45 network interface. Therefore, different roles from the factory can monitor the machine status and make scientific decisions by viewing the required statistical and analyzed data of the machine tool on the computers or mobile phones anywhere and anytime, which is very meaningful for the smart factory.
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