ABSTRACT
Greenhouses are used for growing plants in a range of facilities, it can
change the crop growing environment, enabling it to the outside of four seasons
and harsh climate， creating suitable conditions for crop growth. Greenhouses
as important component of agriculture, has become our research directions. How
to use science and technology to control environmental factors within the
greenhouse， greenhouse industry has become an important subject of study。
Described in this paper, based on Siemens S7—200 series PLC control
system design of greenhouseThe research will be used temperature sensor,
andCO2 concentration sensor, and light sensor on greenhouse big shed in the the
index for detection, will measurement value into PLC in the, in PLC will be its
and set value for compared， again issued corresponding of instruction drive
peripheral equipment to Regulation greenhouse big shed within of environment
parameter, to achieved has greenhouse big shed of automation, and intelligent of
control. On this basis ， using configuration software configuration design of
control systems ， monitoring, data logging, data output function, achieving
excellent control system human—machine interface， for greenhouse research
to provide new direction.
Keywords: greenhouse; programmable logic controllers(PLC）; sensor; control；
application.
