| The real-time acquisition, transmission, processing and analysis of shopfloor field data are the foundation of rapid decision-making and response in modern manufacturing enterprises. With the development of manufacture automation and enterprise information, the requirement of automatically collecting production information becomes more and more intense for enterprises. However, the variety, heterogeneity and the closed CNC system of NC machine tools make it difficult for enterprises to automatically collect information at manufacturing spots. Therefore, it will be very meaningful to study the data acquisition of NC machine tool.In this paper, the relations between main body, PLC and CNC of NC machine tool in the perspective of information collecting are analyzed, and the realization technology and the advantages and disadvantages of the three collecting methods are researched, which are basing on standard communication interface,PLC,electrical circuit of NC machine tools. Then one realization technology, the method based on external PLC, which is based on the electrical circuit of NC machine tools is studied in detail, the process realizing data real-time acquisition of processing states of NC machine tools by this technique is analyzed, and general OPC client reading data from different OPC server is researched.Basing on this research, the general structure of Data Real-Time Acquisition and Supervision System of NC Machine Tool (NC-SCADA) is designed in this paper, which has two collecting function including the methods based on RS232 serial and external PLC. Several key techniques in realizing the system are studied, and the NC-SCADA system is developed, which was applied successfully on the production line in Wheel and Tyre Plant of Maanshan Iron & Steel Co. Ltd. This system has characteristics of universality, expansibility and reusability.Finally, the whole paper is summed up and further work is looked forwared as well. |
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