For large-scale vegetable greenhouse planting base, it can complete monitoring, data collection, browsing, graphic screen display, data alarm monitoring, historical data processing, database chart analysis, report printing and other functions for all greenhouse environments.
3. Greenhouse control system requirements
The greenhouse control system sets the high and low range values ​​of indoor temperature, humidity and CO2 concentration according to the requirements of indoor plants. The output signal controls the switch of the sunroof and side windows of the greenhouse, the sunshade of the ceiling, the lighting, the nozzle, the exhaust system, and finally Realize the automatic control function of the greenhouse. Specific functions of each greenhouse:
(1) Detecting and controlling the dual-channel temperature and humidity controller (2) Using the host computer or the field number keys to modify the temperature and humidity setting value, you can query the temperature and humidity setting value, etc. (3) Output signal to control the switch of the greenhouse sunroof and side window , ceiling awning, lighting, nozzle, exhaust system... and can calculate the time and number of switches
4, control equipment selection
1) Temperature and humidity control AI-702MFJ5L2L2S 2-channel display alarm device.
Module description: J5 module 2 channel transmitter input (including 24V power supply 4 ~ 20mA input); L2 L2 module relay contact switch output; S module communication interface.
Sensor: temperature and humidity integrated transmitter, range: humidity 0 ~ 99% RH; temperature -20 ~ 50 ° C; output: current 4 ~ 20mA; power: 24VDC.
Parameter setting: set the dF hysteresis range
Humidification: When the indoor humidity is less than the set value, the spray is controlled to turn on. When the indoor humidity reaches the set value, the spray is turned off.
Dehumidification: When the indoor humidity is higher than the set value, control the opening of the sunroof, open the ventilation, and strengthen the air convection to achieve the purpose of reducing the indoor humidity.
Temperature rise: control the heating system, close the sunroof, open the sunshade (when the light is strong), turn off the sunshade (when the light is very weak).
Cooling: The action of the top spray, window, ventilation, sunshade and other mechanisms.
2) CO2 control AI-701FL2 V24 single alarm device.
Module description: The V24 module supplies 24V to the gas sensor.
Sensor: Carbon dioxide transmitter, range: 0 ~ 20000PPm optional, output: current 4 ~ 20mA; power: 24VDC.
CO2: The indoor CO2 sensor detects the content of CO2, and automatically controls the CO2 application valve to adjust the indoor CO2 content according to the difference between the measured value and the set value.
3) Statistics: sunroof, spray, sunshade opening time/time AI-301ME5I5I5I5S type switch input module.
Module description: I5 module digital input. There is a PC software to count the number of times of opening, and the time history curve of the switch quantity is square wave, which can realize multiple queries.
5, mechanical control settings, remote control
The skeleton of the greenhouse is made of galvanized steel pipe arc-arch structure, covering double-layer plastic film, the inner layer is no dripping film, the outer layer is long-life film, and the layer is continuously inflated with an inflator, which has good heat preservation performance. In order to facilitate natural ventilation, the roof of the shed has a skylight and side windows with side windows, which are opened and closed by an electric window opener.
There is a sunshade net in the greenhouse, and the sunshade system of the greenhouse is driven by a motor through a transmission mechanism to control the opening and closing. When manual electric operation is required to open the electric drive, click the computer software control button to open and close the AI-301ML5L5L5L5L5S switch output shading system.
6, software design
According to the system requirements, the on-site AI display control instrument forms a greenhouse environmental data monitoring network through the upper computer. Various data is transmitted to the computer AIFCS monitoring software through the RS-485 bus for recording or printing, and remote control. The AI ​​display control instrument is connected with the computer, which can realize multi-point long-distance measurement and control with a communication distance of 1200 meters.
The system is a software product developed by Yudian Electric Control Configuration Software AIDCS For NET V8.0, which can be used directly without the system configuration. The software is used in conjunction with the temperature and humidity controllers to form the AIFCS fieldbus computer network version monitoring system.
Temperature and temperature control system is divided into: on-site greenhouse controller; control room; management consists of three parts. The on-site temperature and humidity controller is responsible for displaying the temperature and humidity and automatically controlling the opening of the sunroof and sunshade. All control information and data information are managed and distributed in the control room and management computer. On-the-spot monitoring of the on-site temperature and humidity controller, data acquisition and processing of various transactions.
Software Structure The internal structure of the software can be divided into the following three parts: data acquisition, data processing, and rights management. ◠Data collection: The system collects real-time data such as measured values ​​and equipment status values ​​from the warehouse site temperature and humidity controller, and stores them in the system. Read the database for future data query and other use.
â— Data processing: The system extracts data from the historical database according to user requirements and completes the specified processing functions, including historical data display, historical curve drawing, reports, alarms, and so on.
â— Privilege management: The user defines the system's privilege and operation password, which is suitable for each management layer to have different operation rights.
7, the conclusion
Temperature and humidity are important environmental conditions for crop growth. It not only directly affects the growth and development of crop roots and soil microbial activities, but also changes in soil temperature and humidity can induce water movement in soil. Control the temperature and humidity of the greenhouse to keep it within a certain range. The use of AI display controller to control the temperature and humidity of the soil not only has the advantages of convenient control, simplicity, and flexibility, but also can greatly improve the technical indicators of the controlled temperature and humidity, thereby greatly improving the quality of the product.
The system uses localized equipment to reduce the investment in fixed assets equipment, and the system runs stably, which is highly praised by customers.
Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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