Intelligent agricultural control system of modern greenhouse automation control system

(1) Network composition of system group

According to the requirements of process operation, we do the following network system design: the network adopts RS485 bus design. Each 5 sheds are one network node. All sensors are 485 bus, and finally, data of each shed are collected to monitoring center through hub.

The data that the whole system can carry are divided into the following parts:

1: Industrial control data

2: Collect data

3: Modbus bus communication of industrial standard

4: Control system

（ 2) Networking features

The automatic control system is an open control system. Besides the good network communication ability, it also has the communication function and standard external communication interface with other control systems. In the future, the control system can be expanded arbitrarily. The whole system adopts multi-level network structure, namely production management network and production control network, which separate the process real-time data, operation monitoring data information from non real-time information and shared resource information, and use different networks respectively. The communication efficiency is improved and the communication load is reduced.

The optimal principle is field control, followed by monitoring center, and finally remote control

(3) Communication co-ordinate used

Modbus

The protocol is developed by Modicon, a famous manufacturer of automation equipment, and is a general protocol applied to automatic controller. Through this protocol, controllers can communicate with each other, controllers via a network (such as Ethernet) and other devices. It has become a general industrial standard.

2、 Modern agricultural greenhouse control system

(1) Overview of control system

With the development of social economy, facility agriculture, as an important way of agricultural sustainable development, has been paid more and more attention by all countries in the world. The construction and development of the project in facility agriculture is an important part of urban development and a high-level stage of the development of facility agriculture. It is hoped that the natural environment of plant growth will be changed, the best growth conditions for plants will be created, the adverse climate outside will be avoided, and the production period can be adjusted, the growth and development can be promoted and pest prevention and control can be achieved.        The remote canopy monitoring system is a kind of automatic remote intelligent control system for the monitoring and control of the environment temperature and humidity in the home and warehouse (workshop, flower shed and plastic film shed). It can adjust the temperature automatically by controlling heater and refrigerator (ventilation), and at the same time, it can adjust the relative humidity of environment automatically by controlling the operation of humidifier and dehumidifier, so that the temperature and humidity of the environment can reach the appropriate range.

（ 2) The characteristics and control of the greenhouse environment     Because of plastic film covering, the shed has formed a special microclimate which is relatively closed and open. In order to cultivate vegetables in greenhouse, we must master the characteristics of environment in the greenhouse, and take corresponding control measures to meet the conditions of vegetable growth and development, so as to obtain high quality and high yield.

Environmental conditions in the shed:

1. Light in the shed

2. Air temperature in the shed:

3. Air humidity in the shed

4. Carbon dioxide content in the shed

5. Temperature of soil

6. Moisture of soil

（ 3) Remote control technology of modern shed

This project uses the hardware of the high-speed 32-bit controller, high-performance temperature and humidity, carbon dioxide sensor and illuminance transmitter, and constructs a greenhouse environment monitoring system for agricultural greenhouse through the current high-speed optical fiber network. The system can automatically monitor and adjust the temperature and humidity, illumination, carbon dioxide concentration, ventilation, rolling curtain lifting, drip irrigation control, access control and other parameters of crop environment. Through the output of Rongan special software, the system can help the growers to make comprehensive and detailed data analysis, and transmit the data to the upper data storage and display area through the network and relevant communication protocol, so as to realize remote data collection. And reliable optical fiber communication network is adopted to realize remote equipment operation and alarm prompt of related data. And according to the current national standards of environmental protection and energy conservation, each shed has related energy metering devices, which facilitates the allocation of resources used by customers and maintenance of operation parameters.

（ 4) The principle of control system

The greenhouse environment includes a very wide range of contents, but generally speaking, the greenhouse environment mainly refers to the temperature and humidity, light, carbon dioxide concentration of air and soil. The computer receives various environmental factors information through various sensors, and controls the operation of corresponding greenhouse equipment through logic calculation and judgment to adjust the greenhouse environment. The output and printing equipment can help growers to make comprehensive and detailed data analysis and save historical data.

（ 5) Control system functions

1. fan control system

2. rolling curtain control system

3. drip irrigation control system

4. indoor temperature and humidity control system

5. indoor lighting control system

3、 Remote monitoring system

(1) The principle and characteristics of the system

The automation of greenhouse measurement and control focuses on saving labor, improving the efficiency and technical level of greenhouse production, realizing the measurement record of temperature and humidity, automatic control of rolling curtain, drip irrigation and other equipment, and realizing the organic combination of agricultural machinery and agronomy. Thus, the technical level of greenhouse production can be greatly improved, and the development of facility agriculture to high-quality, high-end and efficient direction is promoted.

（ 2) Functions of the system

The data server is responsible for the real-time data collection and storage. The communication server is responsible for the output of logic such as data operation and report. The operator station establishes control circuit, modifies the internal policy parameters in local controller, sets data acquisition parameters and reports for the operator to monitor the control circuit and measurement parameters of production process and realize automatic record, report printing and alarm printing; The communication with local controller of the field control layer is completed through Ethernet communication.

(3) The software of upper configuration and its development

We will use a set of configuration software as the development platform according to the requirements. The development system is an integrated development environment, which can create engineering pictures, analysis curves, report generation, define variables, compile action scripts, etc., and configure various system parameters. We say "configuration" is completed here. The running system will execute the developed system and complete the process of computer monitoring. Developers can complete the design of monitoring interface, definition of animation connection, configuration of database, etc. in the development environment. The development system can easily generate various complex and vivid pictures, and can reflect the field data realistically.

（ 4) Coordinate the operation of software module

According to the field investigation and the current operation of the industry, we will develop a set of operation modules by using Rongan special program to realize the parameters needed for remote control calculation of modern agricultural shed, and write it into the database (the database adopts Microsoft SQL Server) for the next processing, At the time of each season, we can simulate the operation of the system in advance according to the pre-designed calculation method. And on the premise of the growth of crops and the environment conditions to which they are adapted. And the software can be connected to the upper software, and can collect the relevant data. And can make corresponding calculation according to it. Complete the data model in advance. The three systems work on a database platform, forming a unified database application, namely, one platform and three applications.

Open modern remote shed operation software module

SQLSEVER   Data calculation module

Operation policy control module

Automatic control system for vegetable shed