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Greenhouse as an important part of the facilities, agriculture, greenhouse is a way to change the plant growth environment, to create the best conditions for plant growth, to avoid the outside changing seasons and harsh climate of its impact places, it has the appropriate use of agricultural resources, protecting the environment to improve agricultural production and other advantages. With the continuous improvement of the scale and degree of industrialization of agricultural greenhouse, it is necessary to monitor and control the distribution of multiple greenhouse or conservatory group in a certain area, so much research greenhouse control technology application is very important. Multi greenhouse control technology applied research in a certain area distribution of multiple greenhouse control, industrial automatic control technology used in modern agricultural facilities and equipment, research multiple greenhouse monitoring and control technology. In this thesis, carried out the following work: 1. Describes the development of domestic and international greenhouse, greenhouse control technology, a detailed analysis of the DCS (distributed control, also known as distributed control system), the DCS control level and The DCS hardware structure of the system and software systems. The proposed multi-greenhouse DCS-based control structure, control system solutions, including hardware part contains the PC host computer, PLC for the next crew, communication is composed of three parts; software is controlled in part by the configuration software The process is complete control of the system. Based on the idea of ??DCS control, use of existing conditions, multi greenhouse control experimental system hardware design and software design, hardware design, including PCI-818HD data acquisition card and the connection of the sensor design, digital output amplifier circuit design, execution institutional control circuit design, host computer operating software to monitor and control multiple analog greenhouse greenhouse control system based on force control configuration software, control technology applications to verify the multi-greenhouse. 4 experimental greenhouse system for inspection. , Respectively, in two different temperature requirements of the seed, for example, be divided into four groups observed inside and outside the greenhouse germination, the inspection system control capabilities, and in the operation of the system of detection, processing, executive function were observed. Research, in multiple greenhouse monitoring and control, multi-greenhouse control technology can satisfy the requirements of multi-level management, management of multiple greenhouse has a very important significance.
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