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1引言现场总线控制系统FCS（FieldbusControlSystem）对提高工业生产过程的安全可靠性、经济性和产品质量有着显著效果，在当今的各种类型控制仪表中，FCS具有强大的优势［1］［2］。因此，现场总线国际标准的制定与出台，已为期不远。目前，世界各国都在关注FCS，Smar公司率先
1 Introduction Fieldbus Control System (FCS) Fieldbus Control System to improve the safety and reliability of industrial processes, economy and product quality has a significant effect, in today’s various types of control instruments, FCS has a strong advantage [1] [2] . Therefore, the formulation and promulgation of the international standard of field bus have not been far off. At present, all countries in the world are concerned about FCS, Smar company take the lead