Research Of The Control Methods Inutomotive Assembly Line

The Historical Change of Automobile like other modern advanced complex toolssuch as computer have times characteristics and have closely linked to our lives dailylife.It represents a kind of culture and grade. As the improvingof people’s livinglevel.People require more to the automobile and the corresponding Automotiveassembly develop high technology.It has become a trend to design intelligent andhighly energy saving Automotive assembly using advance-d automationtechnology.control technology and communication technology.PLC has been the one of major automatic equipments in industrial control fieldof automobile production.Because its powerful function. programmable and intell-gent.The structure of Automobile Coating Lines is very complex．In order to make ac-tions between machines and machines smoothly and orderly，what’S more，to ens-ure the Coating Lines running with safety and reliability，a great deal of PLC programcodes are needed．In order to make the maintenance and servicing of electrical hard-ware easily and enhance the reliability of the hard ware，this paper uses distributed I/0modules which based on Field Bus tech nology and the Safety I/O modules based onSafety Field Bus，to cutting down the cost and increasing the flex-ibility of the wholeline．In order to make the programming work high-efficiently and the PLC programmore logical，this paper uses the ideas of modularization to plan the PLC project forthe whole welding line and the ideas of Object Oriented method in high—level prog-ram language to build interface and control variables for every special machine，andalso for some logic units for operation，cycle，sequence controlling and etc．Based onthe interfaces and control variables，the control codes for the machines are modu lariz-ed．When writing PLC program for a Coating Lines，it’S very convenient to combinethe program modules to a software project．The frame of software project is brief andthe readability of the software is enhanced as using this method，which make it easy tobe serviced and understood by the engineers．...