Based On 51 Computers Profibus-dp Intelligent Slave

Recently the fieldbus has become a hot spot of the automatic technique. Many enterprises and scientific research institutions have turned to the product developing from researching it.PROFIBUS has already become one of the openly international standards and been used widely in the whole world, which not only provides the new market opportunity, but puts forward serious challenges to the domestic field devices and instruments. To enter the international market and be conveniently connected to the standard PROFIBUS net, domestic fieldbus products must have PROFIBUS communication interface, therefore, it is urgent to develop the PROFIBUS interface for the domestic fieldbus equipments in the automatic field.Analysis is made to the PROFIBUS in theory and emphasizes the protocol and message structure of the PROFIBUS-DP, based on which this paper puts forward development proposal for the PROFIBUS-DP intelligent slave station' s communication interface. During the research of the thesis, we make the most of modularization design idea and method of design from top to bottom;use advanced programming tool and program language to develop software of the system. The whole research and design has come through the following stages: design of system scheme, design of hardware and software, and system test.With the software that realizes the protocol of the data-link layer, it can make thus intellgent slave communicatede with the master within 500kbp/s. So it can replace the special protocol chip and realizes the function of intelligent slave station.