Design And Implementation Of Bodywork Primer Line Distributed Control System

In this paper, a bodywork primer line is introduced. Taking the assembly line as an example, the design and implementation of a small-scale Distributed Control System (DCS) is presented. To meet the demand of the process flow of the bodywork primer line, the whole architecture design about the system's two-layer functional architecture, Field control station-Operator station, is set up. The field control stations are achieved by Programmable Logical Controller (PLC), while the operator stations are composed of Industrial Personal Computer (IPC). Then the network communication connection of the system is designed to achieve timely and reliable data transmission between the field control stations and the operator stations. The communication network is a token ring and its structure is bus topology. Following these, the function of the field control stations is described in detail, which not only controls the field devices and transmits real time data to the operator stations to realize global monitoring and controlling, but also receives commands and data from the operator stations, which represents "distributed control, centralized management". After these, according to the control requirements of the operator stations, the monitoring and controlling software system is developed with RSView32, which realizes real time control, centralized management and visual dynamic display of the production process. By use of VBA (Visual Basic for Application), the function of RSView32 is extended to get historical data, and with Visual basic6.0, a simple and practical report form program is developed on the basis of RSView32's report form. At last, fault diagnosis methods of the distributed control system are addressed. With PLC's logical calculation ability and RSView32's friendly HMI, the rapid fault diagnosis is achieved, which ensure the normal work of the system. This DCS has been successfully applied in the bodywork primer line, which has greatly increased the efficiency and the product's quality.