Coal Monitoring And Control System Of PLC Based On Industrial Ethernet And PROFIBUS Fieldbus

Coal preparation plant Control is processing technical requirements for coal preparation system, based on the principle of advanced, practical, reliable and reasonable, controlling the main gearings for the coal preparation plant.At the same time alarming each device and auto-processing fault, monitoring run condition of the equipment, and dating main technological information of coal preparation plant, displaying the dynamic parameters. Coal preparation plant control system at the same time as the main control system, implementing data transmission and signal connection with other automatic control system of coal preparation plant. In recent years, the coal industry downturn, coal prices fell again and again. The state focus on clearing up small and medium sized mines. How to guarantee the coal price, under this big situation in coal industry is the main problem. Coal prices depend on the quality of coal, coal quality basically on ash. Coal ash index depends on coal washing technology and the control system. At present the most widely used is heavy medium coal preparation plant. Heavy medium process is complex, large workshop area, high investment. According to this condition, please, how to reduce the cost of investment effectively with Heavy medium process, improve the quality of coal is the purpose of this study.This paper, taking xuzhou mining bureau Zhang Shuanglou mine coal preparation plant as an example, starting from the real control requirements, according to a leading technology of three products heavy medium pressure, developing the process control system based on PLC, industrial Ethernet and PROFIBUS fieldbus.This article first introduces the development trend of the coal preparation plant control system, and then summarizes the main equipment of coal preparation system, analysises and researches on the coal preparation plant technological process deeply, and puts forward the requirement of control system, thus to made full preparation work for the control system based on PLC and industrial Ethernet as the main body of design. After the full preparation, has elected controlle for the coal preparation plant control system, and their structure and characteristics. According to the distribution of plant equipment and participate in the control situation, network topology structure of the coal preparation plant are given, and the structure characteristics and composition of the coal preparation plant control system, and Siemens S7 series PLC and industrial communications network system are expounded. At the same time introduced the hardware composition of the control system of Siemens S7, PLC and Ethernet communication protocols, communication and control system software development platform. Finally analyzed some main problems in the design of control system for coal preparation plant.