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RAM-based shared CAN bus multi-branch elevator
RAM-sharing network of multi-branch CAN theoretical basis, that each branch of the CAN networks based application for a circuit with a CAN bus communications board and connected to shared RAM memory. Each branch to achieve this through the application of CAN communication circuit board, authorized take the bus, the data into the shared RAM or read from the data; the various branches of non-interference and mutually independent, multi-CPU parallel work to achieve CAN communication improve the communication efficiency; add a branch to increase as long as a CAN communication board,[link widoczny dla zalogowanych], the system easy to expand for the elevator control system. According to this principle, the elevator control system of multi-branch CAN bus structure shown in Figure 4. According to the bus structure, we can find mining. Study Figure 3 ‰ bus isolation and application of hardware circuits Power Machinery silicon shoes' education was shared RAMJ a share RAMlII SHOES-E 硇 Xi Zhai education was L,, lCANllC Lo Lo = 111 ~} {ll meal l1l Rui Huan Jian groups of silkworm control of the West bus l. Module floor ll I l slurry 2rI Gou ~-n r a IrI sent Lung Fort rI lI kettle grand grand anonymous Ling Kui paintings fall I spent a branch based on shared RAM for multi-bus structure, the elevator control system structure is very flexible, which is characterized by : (1) As the car as a separate branch of the module, a flexible extension of car parts, car unlimited number of modules, and can extend other functions as required CAN nodes; (2) the number of floor modules without restriction, or dual-entry when the Floor many cases, you can re-s ~ Dil - a branch for the floor module; (3) For more than one group control, is also very easy to achieve, each elevator only add CAN communication board, through the CAN bus to connect the multi-elevator control system in Figure 4-bus multi-branch structure and the network subnet elevator group control elevators form a network. (4) can be achieved through the RAM module internal data sharing, high-speed communications; (5) can also be achieved through the RAM sharing system monitoring one or more points, only accompanied by various forms of communication (such as RS232, USB) communication board can be shared . 5 Conclusion In this paper, multi-branch of the elevator CAN bus program, an effective solution to the elevator CAN bus communication bottlenecks, with high compatibility and cost-effective. References: [1】 wide-Ming Zou CAN bus system design principles and applications [M】 Beijing: Beijing Aerospace University Press,[link widoczny dla zalogowanych], 1996 [2】 Jia Yuhui, Yu says Lin, Fei Qiao, Ruan Wei Zheng elevator floor and the car CAN bus communication design lJl _ Electric Transmission Auto, 2004, (2). AMulti. . embranchmentElevatorCANBusStructureBasedSharingRAMZHANGXing-hua, XUMing-qian (1, SchindlerElevatorCompany.Shanghai200072, China; 2.Tont ~ iUniversity,[link widoczny dla zalogowanych], Shanghai200092, China) Abstract: Withthedevelopmentofcommunicationtechnology,[link widoczny dla zalogowanych], fieldbustechnologyiroadlyappliedinelevatorcontrolsystem. Consideringthecharacteristicsoftheelevatorcontrolbus, thearticlehasintroducedamulti-embranchmentCANbusstructurebasedonthesharingRAMtheory, itensuresthehighspeedcommunicationwithintheelevatorcontrolsystem, makesthestructureflexibleandeasytoextend. Keywords: CANbus; elevatorcontrolsystem; sharingRAM; multi-embranchment Author: Zhang Xinghua (1972 a), male, Suzhou, Jiangsu. T-engineer, mainly in the elevator research and development. T-for; Xuming Qian (1944 a), male, Shanghai, Professor, Ph.D.. . 7 № 51 +28 + I10211 VOLUME lJu
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