The Study And Application Of EMPMS Embedded Multiply Port Modbus Server That Oriented The Domain Of Environmental Protection And Applies For The Electrostatic Precipitator System

In recent years, the government strengthened the atmosphere pollution treatement with the greater attention given to environment protection, the ESP (Electrostatic Precipitator) system becomes more and more important in Power plants and steel works that use coal as energy source, the SCADA (Supervisory Control And Data Acquisition) system for ESP as the kernel component of ESP system pays an important role in the reliably running of ESP system and improving the dusting efficiency.This paper firstly analyzes the exist questions of the ESP SCADA system, such as limited application range, low reliability, without standard interface and couldn't integrate with DCS (Distributed Control System) system. Then, this paper raises the solution of developing the embedded multiply Port Modbus Server, and expoundes the necessity and feasibility from three points of view which are technology originality, technology maturity and the comparison domestic and international.Subsequently, according to the system requirement of eMPMS system, elaborates the total solution for eMPMS in detail, Hardware system includes the selection of hardware platform, hardware interface design and driver design, Software system includes software system structure based on uClinux platform, multiply process model and schedule strategy, the Implement of Modbus application protocol, and so on. At the same time, summarizes the application of eMPMS in industrial field. Finally, explains briefly the following task.Embedded Multiply Port Modbus Server (eMPMS) acts as the middle tier business platform—could supervisory and control the various types of field control devices through 8 RS422/RS485 buses, provide standard Modbus protocol based on TCP/IP, accomplishes the ESP SCADA system with remote control and independent of distance. At the same time, acts as the agency of field control level and DCS system, makes the various types of field control devices integrate with DCS system through standard industrial protocol. So, eMPMS extends the application range and flexibility of the ESP SCADA system, accelerate the efficiency of the ESP system, and plays a positive role in environment protection and the decrease of power plant's dust emission.