Design, Building Automation Systems Based On Lonworks Fieldbus

With the development of computer technology, communication technology and micro-electronics technology, A new industry bus called Fieldbus comes into being. Fieldbus is a fully digital and duplex data transmission system that connects intelligent field devices and automation systems to an industrial plane's network. The technology embeds appropriative microprocessors into traditional measure and control instruments and made them capable of digital calculate and communication. Fieldbus connects many devices into network system by using twisted-pair as buses and realizes data transmission and information exchange following the public and canonical communication protocols in order to make up of all kinds of automation control system to adapt practical require. Filedbus means the third milestone of automatic technology, that is from Distributed Control System(DCS) to Fieldbus Control System(FCS). FCS adapts the demand of complex and intelligent industry. FCS is the inevitable trend of the 21 cn automatic technology.LON(Local Operating Networks) is the one of the excellent Fieldbus, which is presented by Echelon company of USA in 1991. It provides a very strong way for the monitoring system. Under its support, new intelligent and low cost monitoring products were born. This paper discusses the technology and analyzes the significance of applying it into building automation and uses it into building automation system (BAS) of one intelligent building in LanZhou.The aim is, the first, to primarily research in the rising technology fields. The second is, comparing with other traditional project, to adequately realize the merit of LonWorks and to ground for pushing the technology into the control system in the future. Research proves that this method has rapid dynamic response and it is practical reference value for the central management and control of distribute object.The structure of this paper is as follows, in chapter one, the present status of BAS, fieldbus and the FCS are introduced. Compared with the DCS, the significance of the FCS applies in building automation is explained. Chapter two shows the base knowledge of LonWorks Fieldbus Control System. Chapter three gives the design scheme of the BAS of one intelligent building in LanZhou. Hardware structure of system is introduced in chapter four and the software's realization of system's LON is introduced in chapter five. Chapter six describes the development of the system's monitoring system of the upper computer in brief.