| Taking the construction of comprehensive advanced automatic control experiment system as research background, a control scheme is presented based on PROFIBUS, and an advanced control experiment system is established to realize the network of the system in this paper. Surrounding this subject, many questions are further studied as follows.Firstly, the communication mechanism of PROFIBUS is introduced in this paper, and the communication principle between a master station and a slave station or between master stations is studied. Then we combine the specific control object of advanced experiment system to elaborate the specific realization of scheme, network configuration and man-machine interface development. The system is comprehensive, level, versatile and can be configured flexibly.Secondly, because the system equipments are varied and communication protocol is not uniform, we develop a PROFIBUS slave station interface module with multi-protocol conversion function, in order to realize the communication between the equipment without PROFIBUS interface and fieldbus, and we apply the embedded real time operating system RTX51 into the interface communication module, which solves the complexity of much task programming, raises communication reliability and the real time of interface communication module.Finally, according to nonlinear and time-varying parameter of the speed control subsystem of DC motor of advanced experiment system, single neuron self-adaptive PID arithmetic is studied in the control system of the electrical machinery in this paper. The result shows that the control precision and parameter adaptability, anti-interference of DC motor is improved after using this arithmetic. The construction of control system of two grades of computer is expressed, and the communication of PC and PLC of this system is studied in this paper, and the speed control subsystem of DC motor is controlled on the spot. |
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