Research And Development On The P-NET Fieldbus Interface

This paper is original from "Research on the Inspect and Control System of Aquiculture ", carried on by Instrument Technology & Economy Institute, the Ministry of Machinery Industry, Beijing and supported by National Science Committee special fund. This project mainly researches and develops on the technology of P-NET Fieldbus interface and designs an interface according to P-NET protocol.Fieldbus technology is the most advanced technology in the auto-control area, so the application of Fieldbus in aquaculture will accelerate the automation level of aquaculture largely. In our country, the automation level of aquaculture is comparatively low. In the age of automation, aquaculture will face the transform from traditional way to modern high technological mode, and it can be sure that the technology of control technology will be wildly used in every area of aquaculture. In our country, there are some Fieldbus applications in the aquaculture, for example, the "The Water Quality Inspecting System of The Chongming Crab Product Base". In this way the costing of system will be decreased certainly.In this project, we mainly design an P-NET Fieldbus interface, using the interface we can connect the instrument produced in our country to P-NET Fieldbus, in this way ,not only the costing of system will be reduced but also the auto-control level of aquaculture will be improved. The other emphasis of the paper is using the interface designed in the paper to inspect the content of oxygen and salt ,the value of the PFL the temperature and position of water. The purpose of this system is controlling the zoology surrounding of the water and creating a surrounding suitable for the growth and reproduction of livings in water.Through the research in this paper, we can create the connection between the domestic instrument and P-NET Fieldbus step by step. This result has high practical significant to improve the market competition of instrument designed in our nation and impulse the using of P-NET Fieldbus technology in our country.