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CAN Bus in Power Plant Coal Bunker Safety Monitoring System


Exchange, responsible for overall system monitoring and management. Intelligent scene detection point collector collecting temperature, combustible gas concentration, level and other analog signals and analog to digital conversion, communication protocol according to CAN data transfer to the CAN bus, CAN bus data networks based on network communication card into the upper machine. Smart Acquisition is controlled by node controller and field data acquisition controller. Node control use AT89C51, through the CAN bus, the host computer to receive control commands and set various operating parameters, real-time acquisition of the analog input channel temperature, gas concentration and other coal-bit height values, collecting on-site implementation of equipment (coal equipment,[link widoczny dla zalogowanych], ventilation equipment, spray equipment and explosion-proof equipment, etc.) of the switching state signal. If you find the temperature or the concentration of combustible gases and set the deviation to a bit dumb stations operating on the machine for Mine Automation 8O ・ January 2006 1O certain extent, then the audible alarm, and the amount of the corresponding control output to the Executive device. Field data acquisition controller can be divided into A / D conversion unit, D / A conversion unit conversion interface circuits and communication nodes,[link widoczny dla zalogowanych], and several different units, and its main function is to collect real-time information of each field device, and the basis of the information is sent control commands to control field devices. How it works: from the field sensor information may be sent to the analog or digital, analog conversion through the 12-bit ADC into digital information, sent to the CAN bus, the bus station the other nodes according to their own units and operations needs and pre-designed mask inspection codes and inspection to determine whether to receive the information. If the information is more complex for further processing,[link widoczny dla zalogowanych], can be through the operation station (PC) to process and manage the entire network, the information processed and then sent back to CAN bus via the D / A digital-analog conversion unit or communication conversion unit implementation of equipment control field, where important information can be connected with the operation of station records printer to print. Produced for the PHLIPS SJA1000 CAN Microcontrollers: meet CAN2.0B protocol, fully compatible with PCA82C200; support 29-bit identifier mode, there is the receive buffer 64B, through the acceptance mask register and the acceptance code register on the standard or extended frame-way / two-way receiver filter; on the CAN bus error for each error can be interrupted; can detect specific bits and other characteristics of the arbitration lost interrupt _3]. 3 software design system software including PC software and on-site monitoring and control communication processing nodes processing software. Thermal power plant coal storage silo under the safety monitoring system of distributed data acquisition and control features, the system should achieve real-time data acquisition, real-time control, real-time fault alarm, on-site situation display, data storage, historical data query, print reports and other functions. CAN Interface Adapter initialization processing software in the host computer communication to complete. Query node control unit means to receive data from field devices, using an interrupt to receive data from the CAN bus in order to improve the system efficiency. PC communication processing software to complete the CAN Interface Adapter initialization, to determine whether there is a conflict between network nodes, set node priority, data access, compared with historical data, according to the actual situation of the corresponding node and loopback processing, message printing. Software using VC programming, with data storage, historical data query,[link widoczny dla zalogowanych], reporting, printing and remote monitoring system management functions. The software flow shown in Figure 2. Initialization operation three bang -] read data Il Figure 2 PC software flow chart of on-site monitoring and control communication processing nodes processing software programs designed with structured programming, programming language used FranklinC51, with real-time data acquisition and display, real-time processing and control , field parameter settings, failure to achieve the alarm and CAN bus communication functions. The software flow shown in Figure 3. Figure 3 on-site processing software flow control node 4 Conclusion designed hardware, software has been repeated in the laboratory and field experiments and debugging, the system implements the full functionality of user requirements and can withstand the harsh conditions of the scene, running effect good, sustainable economic development in Guizhou to make some contribution. References: [1] Yang Xian Hui. Fieldbus technology and its applications I-M]. Beijing: Tsinghua University Press, 1999. I-2] W Wu, Ming. CAN bus system design principles and applications [M]. Beijing: Beijing Aerospace University Press, 1996. [3] Wang Yifeng, Li Qi. CAN bus based distributed data acquisition and control system IJ]. Industrial Control Computer, 2000,13 (5). Lai legs were taken one by one the original one by one one by one, according to Gu Island to tear the system one by one withdraw one by one differential
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