GPRS RTU remote monitoring system for water diversion in agricultural irrigation area

summary:

The shortage of water resources has become a global problem. With the development of economy, the contradiction between the increasing demand for water and the shortage of water resources forces all countries in the world to seek effective solutions. Therefore, using modern means to build a real-time monitoring system of water resources, dynamically grasp the changes and utilization of regional water resources, and maximize the regulation and use efficiency is an urgent need to promote the sustainable development of economy and society. The characteristics of Engineering dispersion, variation of water and rain conditions, timeliness of crop water demand, dynamics of irrigation water supply and particularity of irrigation area make the water management of irrigation area very arduous. The advanced level of irrigation management means not only reflects the development level of science and technology in China, but also the actual needs to ensure the safe operation of irrigation projects, realize the optimal allocation of water resources, improve water efficiency and ensure the sustainable development of irrigation areas. The main purpose of water diversion monitoring system in irrigation area is to solve the data acquisition and monitoring of monitoring points in each link of water diversion project.

The system is composed of monitoring center and each water source monitoring point. The data acquisition terminal (jy-rtu4100) of each water source monitoring point can monitor and collect various data such as water level, pressure, flow rate and so on, which can be used by the control center and relevant departments for analysis and decision-making, improve work efficiency, ensure water diversion quality and meet the water demand of irrigation area.

The water diversion monitoring system in the irrigation area can monitor and control the remote on-site operation equipment, so as to realize the data transmission of water diversion pipeline pressure and water flow speed and the automatic control of valve switch, reduce the failure rate and improve the response time to the system. It is convenient to timely and quickly understand and control the remote water source well, diversion pipeline and valve, reduce the failure rate and maintenance time, and reduce the number of water cuts. The data acquisition terminal of each water source monitoring point can automatically collect the real-time data of water diversion pipeline pressure, water flow speed and switch status, and transmit the information to the monitoring center of the irrigation area. The monitoring center can find the fault location through the analysis of the transmitted data, so that when a remote end fails, it can solve the problem in the shortest time, restore water supply and improve the overall service level, Thus, the informatization and modernization of water diversion in irrigation area are realized.

System composition:

The water diversion monitoring system in the irrigation area is mainly composed of central control station, mobile phone, on-site sensors (flow meter, water level gauge, etc.), jy-rtu4100 GPRS RTU integrated with data acquisition, transmission and control provided by Xiamen Ruishen automation company, and water diversion monitoring software in the irrigation area.

1. Central control station:

The server applies to configure a fixed IP address, and uses the special line provided by the mobile communication company to connect with the GPRS network. As the dedicated line can provide high bandwidth, when the number of diversion monitoring points increases, the center can meet the demand without capacity expansion. The central monitoring station server adopts dynamic IP address (the peanut shell software can be applied in the form of domain name). When the number of monitoring points increases, the center can meet the demand without capacity expansion (suitable for those with dozens of monitoring points).

After receiving the connection application from GPRS network terminal, the monitoring center server authenticates first, and then accepts and processes the transmitted data. The remote monitoring center realizes the collection and processing of the status data of each monitoring point of the whole water diversion remote monitoring system, and can perform advanced algorithm processing on all data through the powerful soft logic function integrated in the system. Send the result value back to the site or send it to the third-party system or database through embedded SQL language, OPC, ODBC and other standard interfaces, so as to realize full data sharing, cross access and high independence of application.

2. Juying electronics jy-rtu4100 GPRS RTU product introduction

1) Basic principle:

The digital sensor (or analog output sensor) and wireless intelligent measurement and control terminal are connected through RS-485 bus to form a field monitoring unit. CDMA / CPU, wireless data storage module. Multi channel analog quantity can be accessed on site

1、 Provide equipment status indicator to facilitate equipment maintenance; 2、 Wide voltage power supply range: 5v-30v; 3、 With RS232 and RS485; 4、 Built in high-capacity SPI flash (1mbit-64mbit optional) to save data locally for a long time (customized); 5、 4-way analog input, acquisition accuracy: 12bit 6. The transmission supports a variety of protocols, and our company's self-defined protocols and MODBUS protocols (ASCII, RTU, Modbus TCP) are perfectly supported; 7、 The data transmission adopts GSM module to realize the following functions: 1) GPRS disconnection and automatic reconnection; 2) Up to 6 central servers can be connected at the same time as required; 3) Support the addressing mode of fixed IP, domain name resolution and APN private network; 4) Support TCP, UDP, PPP, ICMP, DNS, FTP and other protocols; 5) The number of supported nodes is theoretically unlimited as long as the server resources allow; 6) Reduce the cost of wiring and the trouble of construction; 7) Support SMS data transmission and SMS parameter configuration; 8) Support phone and SMS wake-up function; 8、 Support special software for local and remote parameter configuration and maintenance; 9、 Support local and remote firmware upgrade; 3. Configure GPRS activation number, call number and monitoring number

[query command] * jy#02#

[configuration command] * JY #02# activation number # call number # monitoring number#

[parameter description]

Parameter name parameter type remarks

Activation number str16 11 digit mobile number

Call number str16 11 digit mobile number

Monitoring number str16 11 digit mobile phone number

If the length of the configured mobile phone number is less than 3, it is considered to be an illegal number.

[example reference]

Example ①: configuration activation number: 1381111112

The configured call number is 1381111113

The configured listening number is 1381111114

Send > > * jy#02#13811111112#13811111113#13811111114#

Reply < < * JY: 2#: Call Number: 1381111112, monitor number: 13811111113, activation number: 1381111114

Example ②: view current configuration information

Send > > jy#02#

Reply < < * JY: 2#: Call Number: 1381111112, monitor number: 13811111113, activation number: 1381111114

3) GPRS transmission features:

Based on the wide distribution of irrigation areas, most of their remote acquisition still use the wired transmission mode, and the amount of line maintenance is very large. Due to the public use of telephone lines, there are often conflicts in communication, which not only affects the data transmission, but also interferes with the normal work of the Irrigation Department, and this way also has a certain impact on the normal and stable operation of the program-controlled exchange of the communication department. In order to ensure the transmission quality, if the special line mode is adopted, the investment cost is too high; The communication mode of GPRS wireless digital network is adopted to solve the bottleneck problem of water diversion information collection in remote irrigation area.

GPRS is the English abbreviation of general packet radio service. It is a bearer service developed on the existing GSM system. Its purpose is to provide GSM users with packet data service. GPRS abandons the traditional exclusive circuit switching mode and adopts packet switching technology. Each user can occupy multiple wireless channels at the same time, and the same wireless channel can be shared by multiple users. It makes effective use of channel resources, and the bandwidth can be up to 171.2kb/s. At present, the GPRS coverage of China Mobile has reached almost 100% in central cities and more than 80% in remote areas. The actual application bandwidth is about 20-40kb / s, which is especially suitable for the communication needs of the remote monitoring industry and completely replaces the traditional wired

Modem, X.25, digital radio, SMS and other communication

System functions and features:

1. Function:

Irrigation area diversion remote monitoring system is a professional monitoring system based on GRPS wireless communication network, which can realize large-scale (hundreds to thousands of monitoring sub stations) remote wireless monitoring and complete concurrent communication through multithreading

Using high-performance server and high-performance remote measurement and control terminal, it can realize the needs of remote telemetry, remote signaling, remote control, remote pulse and remote adjustment. It can obtain various data of hundreds of sub stations in a few seconds and complete the functions of remote control and remote adjustment. It has incomparable real-time response speed of many systems and high reliability close to zero fault and zero maintenance. The specific functions of the system are as follows:

◎ data timing acquisition: the remote monitoring center can send monitoring commands to all on-site measurement and control units regularly through wireless data transmission channels to realize the timing data monitoring of water source wells and diversion pipelines.

◎ on demand data acquisition: the remote monitoring center can request and call the data of one or more water source wells and diversion pipelines at any time;

◎ communication control function: start / stop the data acquisition of water source well and diversion pipeline terminal, switch the channel used by the terminal, etc;

◎ channel quality monitoring and fault diagnosis, communication flow calculation;

◎ it can support multiple communication protocols and multiple communication channels;

◎ add / delete the water source well terminal and modify the terminal communication parameters, such as address, communication protocol, data call cycle, etc;

◎ modify the terminal parameters of water source well, such as various alarm limits, and send the necessary parameters to the terminal of water source well;

◎ event alarm processing function: the system can set alarm upper and lower limits, effective upper and lower limits respectively for analog quantity. When the data exceeds the limit, alarm records can be generated and saved;

◎ the data storage cycle can be set to save in case of change, 10 minutes, 30 minutes and 60 minutes according to different data types (the storage cycle shall be greater than or equal to the collection cycle);

◎ authority management: all system operations have authorization control;

◎ calculation function: support common functions;

◎ delicate images and realistic animation display;

◎ fully functional data acquisition interface;

◎ when the alarm occurs, the alarm screen can be automatically pushed out;

◎ generate the time curve of each acquisition parameter;

◎ comprehensive query of historical data and real-time data display;

◎ report generation and printing;

◎ web publishing function;

◎ remote start / stop of well;

2. Features:

1) Practicability of the system:

The remote monitoring system of water diversion in the irrigation area applies the computer to process all the data, which can not only obtain the instantaneous curve, but also process the data and obtain various charts required, without the need for the staff to visit the monitoring site, which greatly reduces the labor intensity of the staff, and is convenient for the management department to understand the situation in time, further analyze and take response measures in time.

2) Real time performance of the system:

The remote monitoring system of water diversion in the irrigation area adopts the latest communication and software and hardware technology, and establishes a clear and reasonable system architecture, which can realize multi-threaded remote concurrent communication. In a few seconds, hundreds of deep well data can be transmitted to the monitoring center in real time for centralized monitoring and remote dispatching, so as to realize the timely alarm of fault information and the timely treatment of shutdown faults by means of communication. The huge amount of data provides a powerful real-time database as the support of the system, which has incomparable advantages over the traditional radio polling and other methods.

3) Openness of the system:

The remote monitoring system of water diversion in irrigation area is a mature and open system. The so-called openness refers to the adoption of standard protocols in terms of protocols, which can expand the system or modules, facilitate long-term upgrading and maintenance, and prolong the service life of the system. By updating components, the system can exist all the time without paralysis of the whole system and causing a lot of investment losses.

4) Maintainability of the system:

The remote monitoring system of water diversion in irrigation area has a very low failure rate, so the corresponding maintenance is very small. The framework of the system is very clear, with multiple debugging tools to identify the fault. In addition, years of experience and strong professionalism ensure the high reliability and low failure rate of the whole system.

5) Powerful functions of the system:

According to the needs of the supervision unit, the remote monitoring system of water diversion in the irrigation area can carry out advanced development, increase or reduce the number of functional modules and monitoring points, automatically send an alarm, automatically pop up the fault screen and automatically print. The field measurement and control unit can store data and automatically save it in case of power failure.

Summary:

Taking the water diversion process of irrigation area as the background, this system puts forward a design scheme of automatic water supply computer monitoring system based on PC using GPRS RTU. The field commissioning shows that the scheme is feasible, and jy-rtu4100 not only ensures the uninterrupted water supply of water channel, but also improves the management level of irrigation area. The system has the advantages of short development time, low cost and obvious energy-saving benefits. It is suitable for the technical transformation of water diversion projects in irrigation areas.