| Nowadays, as the development of information technology, the traditional way of monitor and control has been influenced deeply. Fieldbus technology is becoming more and more popular because of its simpleness in structure and easiness in maintain and high reliability and openness. Control system based on Fieldbus(PCS) has caused an epoch-making change in industry control realm. Now, along with the national enlargement foundation on basic establishment, road net developments will become one of the investment's points, lots of places because of their geography position have a large number of tunnel. Because of their special environment, many of them need tunnel monitor and control system(TMCS). So, new tunnel monitor and control system and old ones need a safer and better efficiency resolution. Fieldbus is a good replacement.First, this text introduced the present condition of TMCS and the PROFIBUS technology, then design a new TMCS based on redundancy ray PROFIBUS. Last, tunnel monitor and control system of DaWan railroad and Shangjie superhighway are introduced in detail.
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