At present, the production operation of industrial water supply points mainly relies on manual completion. In order to ensure the normal operation of each well in the industrial water supply point, the well dispatching station needs to be on duty 24 hours a day, and the dispatchers carry out the shifting of the work to ensure the normal operation of the industrial water supply production. Due to the manual control method, this makes it difficult for dispatchers who perform on-site tasks at night and in bad weather, and produces unpredictable accidents. In addition, at the industrial water supply point, the distance between some wells and the dispatching station is several kilometers, and the road between the well and the dispatching station is very poor, which also brings great difficulty to the operation on the spot.
With the development of computer technology, communication technology and data acquisition technology, measurement and control technology has also developed rapidly. The ARM-based embedded system is a core processor that is small and compact and can be buried as a component in a controlled device. It provides a user interface, manages the input and output of relevant information, monitors the operation of the device, and makes the device and application system highly intelligent and cost-effective. The hardware of the embedded system is buried in the device in the form of chips, templates, components, and controllers. The software generally uses a real-time multitasking operating system and corresponding application software, and is generally solidified in the flash memory. The software and hardware can be tailored, which is very suitable for a high-performance, high-reliability, low-cost, small-volume, low-power measurement and control system. The wireless water supply measurement and control system based on embedded technology is designed to save manpower resources, facilitate the safe production of industrial water supply and improve production efficiency.
1 ARM-based embedded system overall designThe whole measurement and control system consists of three major parts: industrial water supply measurement and control unit, wireless data communication system and main control computer.
The industrial water supply measurement and control unit is the core of the whole system. It is mainly composed of embedded core, data acquisition module, control output module and communication module. Among them: the data acquisition module collects various data and parameters of the industrial water supply site through various sensors; the control output module switches various operating states of the industrial water supply site through relays; the communication module is responsible for communicating with the main control computer, transmitting various data and command. The embedded core is the core part of the field control unit. It is responsible for coordinating and scheduling the running of various tasks to achieve various functions.
The master computer is the system management center and user window of the entire system. On the one hand, it is responsible for receiving various data sent by the on-site control unit, sorting and saving it in the database and displaying the latest information on the screen; on the other hand, the manager can control the on-site control unit through the control commands provided by the main control software. At any time, the production method is converted to the production site.
The overall working principle of the system is: the system collects the production data and various parameters through various sensors placed at the production site, exchanges data with the main control computer under the deployment of the operating system communication tasks; and receives the action commands issued by the main control computer. After receiving the command, the processor directs the actions of each relay to realize the control of the production equipment; after receiving the data collected by the sensor, the processor analyzes and compares itself, and when the data value exceeds the normal range, the processor implements the production equipment according to the established program. Corresponding protection operation, the error type information is reported to the main control computer wirelessly; the processor can output the working parameters in real time through UART1 to facilitate on-site maintenance; the LCD display task and the keyboard scan task in the operating system can pass in real time. The LCD display externally displays the corresponding working state parameters, and the measuring and controlling unit can also be operated by using the keyboard on the panel of the measuring and controlling unit.
2 system hardware designThe system hardware structure is divided into the water supply measurement and control unit part and the wireless communication part. The schematic diagram of the hardware structure of the water supply measurement and control unit part of the system is shown in Figure 1.
The structure diagram of the wireless communication part is shown in Figure 2.
1) Industrial water supply measurement and control unit The industrial water supply measurement and control unit can be divided into: embedded processor part, digital input and output part, analog input part, three-phase power supply voltage/current collection part, power supply part, etc. according to different functions. The microcontroller part is used as the control core of the system, which is responsible for coordinating the normal operation of all parts of the system; the switch input and output part is responsible for reading the working state of the production equipment and realizing the control of the production equipment; the analog input part is responsible for collecting various sensor outputs. The standard signal; the three-phase power voltage/current acquisition part is responsible for collecting the power supply parameters of the industrial production site; the communication part is mainly responsible for the data exchange between the field control unit and the wireless data transmission station; the power supply part is responsible for providing various types of system requirements. Voltage.
2) Wireless data communication part In order to realize remote wireless measurement and control, the wireless communication part becomes one of the important components of the system. In the existing remote measurement and control system, most of the measurement and control terminals use wireless transmission methods such as GPR S, SMS or microwave. However, since the remote wireless measurement and control system designed in this paper is mainly applied to the measurement and control of industrial water supply points, industrial water supply points are generally distributed in areas sparsely populated and far away from towns, and these areas usually do not have coverage of mobile phone networks or low network coverage. The signal quality is poor, so it is impossible to adopt the GPRS or SMS method that relies on the mobile communication network. Even in areas with network coverage, it is impossible to ensure that each measurement and control point can receive a good signal, so the reliability and real-time of the communication cannot be guaranteed. And it is not practical to build an expensive microwave communication network separately for this set of measurement and control systems. Therefore, the best method at present is to use digital wireless data transmission stations to form a data transmission channel.
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