7=Arial fieldbus application in pneumatic loading system, 0 Department of Electrical Engineering. Shanghai 2 fat Wang Hufeng. Wang Zhongwei. Xiao Yunshi 300 and its application in the opening and testing of the automotive parts of the pneumatic loading system, and stated the principle and preparation of some of the hardware functions, the fieldbus technology produced by computer technology and computer network technology in modern industry Get more and more widely used applications.
The game, the fieldbus and the intelligent controller of the farmer's control system 6 has the advantage of calling the essence, mainly the digital signal transmission of 1 signal to improve the accuracy and robustness of the system; Catch system availability reliability operation quality and management level, control degree dispersion, improve system availability reliability and scalability; 4 in the management is fully open and interoperable, thrifty equipment. material. Shi Ding and maintenance fees can reach 40 left. 7, due to the huge superiority of 阢3, making 阢3 a substitute for 0 has become a trend.
Received date 20 magic 109. Male Tongji University is studying for master's degree, 1 research direction for process control and computer control; Wang Zhongwei 1972, male. Graduated from Shanghai University of Engineering and Technology. Now, China’s limited public, Xiao Yunqing, electrical engineer of the Department of Systems Engineering. Dean of School of Electronics and Information Engineering, Tongji University. Doctoral student.
The pneumatic loading system used to develop and test automotive components is an electromechanical system. It is difficult to achieve by traditional methods; and there are many components that make up the car. It is relatively difficult to test each part so that the built system can meet the requirements of different parts. But it is much easier to implement with a fieldbus, and it is very flexible and scalable.
The corpse is an open fieldbus standard, the 50170 European Fieldbus standard. It was the fieldbus standard specification for production processes jointly developed by 13 industrial enterprises and 5 scientific research institutions under the auspices of the German government in 1987. It was approved as the German standard 0 ancestor 9245 in 1989. Subsequently in December 1989. Established, 1 user organization promoted continuous improvement, and was approved as part of the European fieldbus standard on June 30, 1996, that is, EN50 1 into 8 is an international open and independent device manufacturer. The fieldbus standard is widely used in automation of other areas such as manufacturing automation process automation and building transportation power. It consists of three compatible parts, which are specially designed for the automation system and the one-port interface between the equipment-level ones, which will be twisted, and the people will be 0, 88, 1 and come to the solution. Desperate 31 brothers, Fu Dun, therefore, ruined the inside of the work. Digital data exchange and communication between the inter-level and field-level equipment to achieve low-level to workshop-level decentralized digital control and on-site communication networking at the factory site, thus providing a feasible solution for achieving comprehensive automation of the plant and intelligentization of field devices.
And specifically, the book, the person, and the book 0 have the Beijing Changan Automation Engineering Group, the highway, the gas and petrochemical station library explosion-proof monitoring, the electricity is not, the generation is decaying, 0 Na uses the 12th floor and the household level, the first 3 7th long plus definition; 1 7 data transmission using extended application layer including fieldbus message specification, 3, 14, 58 fieldbus system application depends largely on which transmission technology is selected. When it comes to process automation, data and power must be on the same cable. It is impossible to meet all requirements by Yin Wei's transmission technology. Therefore, the following three types are provided for å’«485 transmission of 0 and 3 It is also the most commonly used species in 01. The electrical, male shielded twisted pair Copper Wire used in the Yang 485 transmission technology. For common root pair, the transmission rate can be selected between 9.6 and 8 to 12 plus 8. When the system is put into operation, all devices must use the same transmission speed. At the time of installation, all devices are connected to the bus, and each segment can connect up to 32 stations; with repeater, the top 1 of the shell 1 can connect 127 with the 582 transmission technology of the corpse 1, which can carry out continuous transmission without current. Twisted pair is used in this technology. Transmission speeds up to 31.25 illusion. 8. Installation method and å’« 485.
There are now integrated converters that make it possible to use both anti-485 and fiber optic technology in the same system.
It must be that the actuator sensor interface is out of 61 and 31.
36 oil cutting, 0 abbreviation, often also abbreviated as must or 3. It has the advantages of other powerful and expensive fieldbus, but also a less expensive but easy to use fieldbus.
The network is a network of digital peripherals and optimized hexadecimal external devices. Traditional sensors and actuators can be easily integrated into a network with considerable flexibility and power.
Must be her, the network is a tree-shaped structure through unshielded networks of up to 8 people, where the bus length can be up to 1.31, and the network is tarred by the main station. It consists of 3 generations of slave stations, of which the number of slave stations is up to 31, and each slave station can have up to 4 sensors and 4 actuators, that is, 3 people for the whole person, sensors and actuators owned by the network. The maximum number is 124; but if it is bidirectional, it is 248.
In the 3-7 network, the primary station can provide the following services to initialize the identification of the network. The identification of the network must be 1 to hit all the devices in the network, periodically set the parameters of the slave, diagnose the bus and the slave, The slave sets the address and transmits the total milk error to the upper master in the event of a failure.
The network must assign a unique address to each slave. This address can be set by the master station or by the corresponding application software. In person 5:7, the main station in the network uses 53 cycles to detect 31 slaves hanging on it, paying all the devices to periodically check to determine if there is data to be processed, and the ruler 81!1 The data from the network to the primary station and to the secondary station are transmitted periodically at the control of the primary station, that is, the information on the bus at the same time is always unidirectional. Must be seventeen, the station between the primary station and the secondary station in the network immediately responds. The information is transmitted in groups of 4 bits during transmission, and when transmitting information, the primary station and the secondary station can discern the error information and perform retransmission.
The necessary vertical application area is a network of escaping sensors and actuators, and such networks are often used for the field of security requirements, just like listening and other fieldbus-like, can be traditional The wire meets the security requirements for information transmission. In the network, dynamic signal transmission and security monitors are used to improve the security of information transmission. This monitor can appear in the network as an additional or general component in a person's 5 shirt 3 that must handle the security-critical information. It now recognizes the more secure slaves and activates the emergency function when transmitting an application alarm or monitor detects an application error.
3 System Requirements and Implementation Method The system is a pneumatic loading system for developing and testing automotive parts. It requires a multi-station multi-station system. It also requires the system to adapt to different experimental projects, that is, the system requires flexibility and flexibility. Scalability. All four experimental platforms in the experimental field require the system to meet the actual requirements of each experimental platform, and the experimental results can be revealed.
Based on considerations of system requirements and the end use of the actual system, the system consists of an electrical control section and a pneumatic section. The electrical control part consists of 5 plus 1. On-site, 3-wire technology and the pneumatic part are composed of pneumatic components, such as valve island cylinders.
Grab the pair of fieldbuses. The network on the network 1 uses 10 as the data collection information management layer, which can hang down 127 substations; the lower layer network uses 5 to 6 nets, and serial series of execution components can be hanged. 31 substations; the upper position uses a touch screen as information display.
Using two gates 131520 as the system master station, consisting of 0 network, 1 commits 5 substations under the network, respectively, 2 F`ESTOFBl3fffijSiUASlnteifai.eMast; i.Ui2t, melon 24, each hanging group analog input and output Module; 1 Beijing Changkuo Measurement and Control Technology Research Institute technology development exaggeration, transfer test turntable application, with the touch of 27 touch screen Ki system structure and thus 5 liver, the network is on the mountain 813 island, 5 people; heart 4 For example, 5 main station and its slave station 8. Liver composition, its slave station includes various valve islands under the valve island can be hung various cylinder connection socket input 4 stealing module in it can be connected to various sensors in the wood system 5, the network of the station 乜拈 1 Yang 5 □ 0 public as the 4 system parts of the function introduction function through the 1 mountain 1 bus and the sub-station of the sub-station 104, the network, through the regular data collection to manage the entire network Including equipment fault detection fault alarm, where the fault from the common fault is a communication fault alarm. The number of slave stations in the network can reach 127, and even if a slave in the network fails, the entire network will not be affected. In order to do this, the 052 of the 1st master station will automatically detect the slaves with the 4 faults, and Remove it from the network. Of course, it is only removed from the logic. The 13-inch island used in the wood system is suitable for the Ximen production, 0 valve island, which is essentially a plug-in communication interface module, in which ±, such as digital input and output modules, analog input and output The module, the matching module 乜拈 the digital analog sum, the switch quantity, etc. as well as the person 31 her 8, 38 pm module, the total number of these modules is up to the rank of 1 also 1. The module must be placed on the leftmost side of the 13 valve island. It directly controls actuators such as solenoid valve cylinders.
1224 is the number of two points with fewer points of transmission and fewer internal variables. In this system, their main function is to use the experimental site to achieve some basic control functions. It can be executed either according to the command of the system master or autonomously, depending on how the programmer is designed.
When it communicates with the upper layer network, the information collected in the field is transmitted to the upper control part, and at the same time, the control information from the upper layer network is transmitted to the executing mechanism hung below it.
In the system, the touch screen is used for the experimental project, the number of experiments, the number of experiments, the failure test, and the experimental test. At 1 o'clock, you can also modify the operating parameters by touching the touch screen. Such as the number of running time, etc. The safe operation of the system can be implemented in the form of a password by programming the touch screen. The touch screen can also be connected to the printer to print the results of the experiment.
5 Conclusions Overcoming the application of fieldbus technology in this system, you can see the field bus technology comparison from the realization of complex screwing system. Moreover, the structure of the system is simplified, and the superiority of the field bus control system Han 5 is reflected. With the improvement and development of fieldbus technology, it is believed that the control system based on fieldbus technology will be verified by a large number of experiments on the 28th page in China. The final result of the system is the accuracy of the pressure test, 1. The control of pressure is achieved. The application of the intelligent controller of this design in the air pressure controller has obtained satisfactory results, and the proposed control method is also applicable to similar practical value.
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4 Li Liyong. Master's degree in digital full static pressure controller research, 垌. Beijing Beihang University, 1996.
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