Research On Fieldbus Network Technology

Fieldbus is one of the important focuses in today's automation control area. It is recognized as the Local Area Network in automation systems. Its appearance starts a new age in industry control field. Fieldbus has a deep relationship with lots of techniques, including computer, automation, and communication, now it enters a continuous developing and improving period. Because of the later start in our country, we have dropped behind other countries both in the theoretical research and engineering realization. It is urgent and crucial for us to make a study of fieldbus network deeply.The theoretical and applied research on fieldbus network technology has been studied chiefly in this dissertation, such as the combination between fieldbus and Ethernet, the fieldbus real-time performance, the fieldbus selection, the fieldbus integration, the fieldbus network structure and the fieldbus nodes development etc. Some innovative schemes have been proposed. Some guidance principles and theoretical foundation have been given. Some practical application problems have been solved. Some progresses have been obtained on the fieldbus research.(1) Some problems have been summarized and corresponding solutions have been proposed when Ethernet is used in industry control area. These pay a primary theoretical basis for Ethernet to be used in industry control systems. Based on the research in the Internet technique, three-technique schemes (Encapsulation, Component and Tunnel), which can be used in the combination between fieldbus and Ethernet, are put forward. Their principles are explained in detail. In order to prove the feasibility of these three techniques, three typical examples are illustrated. These research results provide guidance and applied example to develop combination technology between Ethernet and fieldbus. These work have great significance and practical worth.