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With the constant expansion of modern industrial production and the rapid development of the information technology automation, the traditional automated sorting system (Automatic Sorting System) in the logistics industry, the tobacco industry, airport transport system has become more mature, but with the automated production traditional automatic sorting equipment to high-speed, low-cost, compatibility strong direction, this set of computer control network, PLC and electrical control systems in one system can not meet the industrial production to low-cost, rapid, efficient development requirements. Since World War II, the United States, Japan and other developed countries are widely used in industrial production automatic sorting system, and gradually formed a technical monopoly of automatic sorting system most of the wholesale introduction of foreign equipment, the lack of independent intellectual property rights automatic sorting system. To carry out research of the material sorting its control system to achieve a high degree of mechanization of the sorting system, automation and networking, has positive significance for China to improve production efficiency, save labor costs. Most of the widely used automatic sorting system using the traditional control methods, site sensors to collect data, control system through relays and other electrical signal transmission first bit machine control system is bulky, complex wiring and data transfer rate slow component life is short, unstable performance. Developed countries widely used automatic sorting system based on DCS control system stable operation, and high precision, easy to control, cost advantages, but with the development of information technology and industrial control systems to decentralized, intelligent, network development of fieldbus technology has gradually become one of the hot spots of the global industrial automation technology, and much to replace the DCS trend. Fieldbus is installed in the production process areas of the field device and the automatic control of the control room of the apparatus between a digital, serial, bidirectional transmission, the communication network of the multi-branched structure, wherein, PROFIBUS field bus with its unique technical characteristics, rigorous certification standard, open standard, many manufacturers support and continuous development of the application line regulation, to become the common fieldbus international standard one, is currently the most widely used field bus standard. Fieldbus technology will be based on the PROFIBUS-DP protocol used in automated sorting system to replace the traditional 24V DC or 4-20mA signal to sorting site PC monitoring of distributed digital control and field communications network thus provides a viable solution for automated sorting system and intelligent field devices. The comparative analysis of the advantages of PROFIBUS-DP and other several typical fieldbus system, fully understand the automatic sorting system control action process, the scope of application and operating conditions, select the fieldbus technology based on PROFIBUS-DP protocol was designed based on the structure of the overall network of automatic sorting system, and Germany's Siemens (Programmable Logic Controller PLC SCADA software WINCC, etc.) to complete the automated sorting system from the hardware configuration, logic programming, software design configuration and system debugging. Control system is divided into PC monitoring and place under the control of two parts, the host computer structures based on WinCC configuration software platform and global script to achieve full control of the production site; under-bit machine control system Siemens S7-300 core, on-site hardware module via PROFIBUS-DP network communications, field devices to be controlled by a distributed I / O modules, greatly improve the versatility and readability of the control program, the PLC and field devices, PLC and PLC, as well as PC communication. The system is completed by the end of February 2011 the preliminary design, debug motion control laboratory in Guangdong Petrochemical College in March. The debugging process in various parts of the system running in good condition, able to achieve the design requirements of the automatic sorting system. Currently, based on the protocol PROFIBUS-DP fieldbus technology has been widely used in industrial automation in the production process. Based on the successful design of the control system of automatic sorting of the fieldbus PROFIBUS-DP protocol, our logistics, food production, tobacco and other industries to improve sorting efficiency, save manpower cost has positive significance, and also provide a reference for the design of similar projects and transformation and guidance.
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