| Huge improvement has been made to industrial automatic system along with the continuous exploration of morden industry and rapid development of automatic information technology rapid, the application of the traditional automated Sorting System in logistics industry, the tobacco industry, airport transport System already increasingly mature, but along with automatic production equipment develop to high speed, low cost and strong compatibility, and other direction, this set computer, control network, PLC and electrical control System in the integration of automatically sorting System already cannot satisfy industrial production to low-cost, rapid, efficient development request. Since world warⅡ, the United States, Japan and other developed countries are widely used in industrial production automatic sorting system, and gradually formed a technology monopoly, current automatically sorting system mostly imported equipment, complete lack of independent intellectual property rights automatically sorting system. It is starts to study material sorting and control system, realizing the higher mechanize, automatic and internet in order to improve high efficiency, labor cost saving.At present domestic widely applied automatically sorting system most adopts traditional control method, the scene of sensors to collect data, through such as relays electrical control system will signal transmission PC, the control system huge volume, wiring complex and data transmission rate, while components use slow short life, instability properties. Abroad developed countries widely used based on DCS control system automatically sorting system has stable operation, and has high precision, easy control, high performance-to-price advantages, but along with the development of information technology and industrial control system to diversify, intelligent, network development, fieldbus technology is increasingly becoming a global industrial automation technology is one of the hot spots, and the trend of replacing DCS.Field bus is a serial, digital, bidirectional transmission, multi-branch structure of communication network, installed between the production process area deceives and control indoor automatic control equipment, which, the PROFIBUS field bus and with its unique technical characteristics, strict authentication standard, open standards, support of numerous manufacturers and continuous development of application guild regulations, become common international field bus standard and was one of the most widely applied field bus standards.This paper will applied profibus-dp protocol fieldbus technology to automatically grading system,replace traditional 24V DC or 4～20mA signal, it can realize the field level to the shop floor level monitoring of distributed digital control and field communication network, so as to provide a feasible solution for achieve the comprehensive factory automation and intelligent field devices.After analyzing the advantages of PROFIBUS-DP and other typical fieldbus system and abundant understanding the action flow, available range and working conditions of auto-sorting system, on the basis of fieldbus technology with PROFIBUS-DP protocol, designed a general net structure of automatic sorting system,and select the Germany Siemens products (programmable logic controller PLC, PC monitoring software WINCC etc) completed to design automatic sorting system from the hardware configuration,logic programming,software configuration and debugging systems,control system is divided into two parts:PC monitor and lower level computer, PC built based on WinCC configuration software platform and global script production site, realize the whole monitoring; Lower level computer control system to Siemens S7-300 as the core, on-site hardware module through profibus-dp network realization communication, on-site equipment through distributed I/O modules for control, greatly improving the control program commonality and readability,realized the communication comprising PLC to in-house apparatus, PLC to PLC and PLC to PC.This system will be finished the first stage of design in February,2011 and be adjusted in motion control lab in Guangdong petro-chemical collage in March. Every parts of the system run well during adjustment, achieving the design requirements to automatic sorting system. At present, fieldbus technology based on PROFIBUS-DP protocol is extensively applied to industrial automation manufacturing. It has a huge positive significance to our domestic logistics industry,food production and tobacco industry in order to improve sorting efficiency and lower the labor cost, meanwhile, it supports reference and guidance to the design of similar project. |
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