Development And Application Of The Node Based On Lonworks Network

The fieldbus technology is one of the focuses of development of currentcontrolled field, The local operation network LonWorks that was developed byAmerican Echelon company, because of its outstanding opening,interoperability, has gradually become one of the most competitive field busesat present. The key of realizing LonWorks technology is the development ofthe control network node.At first, the thesis has carried on the overall and detailed introduction ofthe developed LonWorks node. This node belongs to the nodal type based onhost processor, and it is organized by TP/FT-10F flash control moduleincluding the neuron chip and MSP430F149 single chip. TP/FT-10F flashcontrol module, as one LonWorks protocol processor, is used to solve theconnection problem of microcomputer and LonWorks network, MSP430F149,as the main processor, is responsible for gathering and dealing with the data ofthe field apparatus. We adopt parallel I/O mode of target of the Neuron Chip torealize the communication between the two, thus guaranteed reliable,high-speed data transmission quality.Then, we applied the already developed LonWorks network node to the airconditioning control system in the intelligent building, form the control systemof air conditioning based on LonWorks bus. According to the structure of thissystem and control request, correspond to the principle that a nodal accordingto a unit, we designed the controller of air conditioning taking MSP430F149single chip computer as the core. Here we adopt module design philosophy,employ enthalpy value, PID control strategy to realize the high-efficient,energy-conserving control system of the air conditioner.At last, to facilitate the control of the field data and forming thecompletely network observe and control system, we adopt the Kingviewmonitoring software to design the control interface of the upper-computer. Here,we use LNS DDE Server and the DDE(Dynamic Data Exchange) characteristicof the Kingview to set up the dynamic data chaining between Kingview andLonWorks network, realized the monitoring, manage and maintain of thelocation plane at control system to air conditioning.