Study On Greenhouse Distributed Control System Based On FieldBus

The facility glasshouse is a kind of high efficient and intensive production mode that equipped with the glasshouse environment control system. It adjusts the microclimate of greenhouse in order to adapt to farm crop growth request. At the time it not only carries out the anti-season production of the farm crop, but also raises the production efficiency. In recent years along with the spread of high new techniques, such as sensor technique, calculator technique, network technique, the intelligence control technique and the living creature technique, it brings a revolution of glasshouse environment control. The glasshouse environment control system is absorbing the new theories and methods continuously, combining the characteristics of the glasshouse farm crop plant, continuously creative, gradually perfect.In recent years, some agriculture and forestry research agencies begin to introduce facility glasshouse to carry on seedling cultivation or science experiments. This thesis topic came from the construction of four sunlight glasshouses and the design of automation control system in forest botanical garden of Heilongjiang province. In the view of the coexistion of opportunity and challenges, the author hopes resolve the economic and the function requests of the glasshouse control system. And expects to push forward industry and intelligent step of glasshouse.This thesis introduced the research development condition of domestic and international glasshouse environment control system first, pointed out the development trend and analyzed the existent shortage of the existing glasshouse environment control system. The glasshouse environment control is used to control the light shine, temperature, humidity, CO₂ density etc. within the scope of the farm crop grow request. So it is meaningful to analyze how environmental factors effect on the farm crop grow and how effect between environmental factors. Based on the model of fieldbus using in the scope of industry control, put forward the AFCS (Agricultural FieldBus Control System) reference model and got the physical model of distributed glasshouse control system. Then the paper carried on the design of the hardware and software of the system based on PC and PLC. An integrity glasshouse control system should still include spray irrigation control system. So the paper includes the of spray irrigation system. At last using the configuration software-KingView6.5, author made simulated software that can imitate the movement of greenhouse equipment. And the software can be used to carry on the parameter constitution, report and curve search, and alarming.