Development of a distributed control system for PLC-based applications

This paper presents experiments aims to built a platform to monitor and control PLC-based processes over PROFIBUS-DP network. The platform is built using industry-standard off-the-shelf PLCs. Integrated with each PLC are communication processors that can be used for connectivity to the network and to a DP modem. The communication processor module used in this work provides an industrial compatible protocol over PROFIBUS-DP. The mode of communication of the industrial automation control system base on the PROFIBUS agreement where variable frequency drives and motor control centers can incorporate bus technologies, and developed a variable-frequency speed base on PROFIBUS-DP. The system can real-time control and collect data from diversified equipment, and the data get across the PROFIBUS is carried to industrial control computer. After data analysis, system carry on the real-time monitoring to the scene, and realize the automation control. This system is very important to study bus, distributed system, the frequency conversion velocity and PLC. It is channel to research on automation control system.