Based On Profibus-dp Field Bus, Marine Bio-fermentation Production Line Control System

The study about marine biologic enzyme, one of the National 863 Programs, has been finished by Yellow Sea Fisheries Research Institute Chinese Academy of Fishery Sciences. The whole product line has a standard preparation productivity of 8,000 tons. At the present, this product is tentatively produced by the researchers in the lab in a low degree of productivity and coherence, which definitely can not meet the large scale producing. There is no such a mature system meeting the produce requirement in both in and out of the country to produce ocean enzyme because it is the newest outcome of the scientific research of the China Ocean Research Centre. Therefore, it is in urgency to design an automatic control system for it.This thesis talks about the research and design of control system in fermentation process of marine biologic enzyme. PLC S7-315-2DP of SIEMENS is adopted as a main station of the system which plays an important part in system control. It deals with various data and flow of technique. Three OP270 operator panels, as the second main stations of the system, can be used by workers to monitor system. By using ET200M, a kind of long-distance I/O module, I/O devices can enter the nearest substation, so it is convenient to connection and debugging. MM440 is the variable-frequency equipment which has perfect communication function. By connecting with PROFIBUS board, we can get PROFIBUS-DP substation. It responds to the commands of the main station real time and controls devices directly. At the same time, it monitors and returns running state of the machine. The CP342-5 communications processor, as the intermediate repeater of the PROFIBUS-DP network, can be used to reduce the communication tasks of the main station.This thesis not only analysis the design and configuration, but also introduces general situation of PROFIBUS and the basic character of PROFIBUS-DP.