Profibus And Its Application In The Steel Rolling Works

With the development of the fieldbus technology, its advantage has became more and more notable in the field of computer's centralized and separated control. The fieldbus features:1. fast and real-time2. open, manipulate and alternate usable3. the functional independency of the locale equipment's intelligentizing4. the highly decentralization of system structure5. the strong anti-jammingAt present, the most popular fieldbus in the world is based on OST model, including physical layer, data link layer, application layer and etc. The FF, Profitbus, HART,CAN and LonWork are the most effective ones on this field.Profitbus, proposed by SIEMENS, is based on ISO7498, which refers to OSI(open system interconnection ) model and defines the speciality of physical transmission, protocol of bus wire's storage and extraction, as well as application function. This bus wire connect the long-distance equipments in system and control equipment of other manufacturer. Especially, the adoption of control word used in communication and control reduced the quantity of control cable, also. The good treatments of grand and protection has a every strong capability of anti-jamming.In the unbender region's technology reconstruction item of the chongganzhongban factory, the PROFIBUS was applied in the basal automation control system to link the 11 SIMOVERT MASTERDRIVES Control equipments with 3 long-distance stations. The control system CPU process remote control for the equipments mentioned above through PRODIBUS-DP, receiving operation and handclap status which feed back by control equipment, using the style of control word in the data format. Although the PROFIBUS-DP has the strong capability of anti-jamming, the anti-jamming measure of this bus wire can't be neglected for a lot of big facility and electrical welding in the normal maintenance which result in strong electromagnetism interfere in rolling mill,.The treatment for the anti-jamming of PROFIBUS makes the control system operation credible by using the shield and good insulation pipe in the construction design. After using the DP, the whole system configuration becomes flexible, at the same time the quantity of control cable and the maintenance work of factory after normal operation are reduced greatly. The successful application of this project can establish basis for the application of fieldbus in the field of steel rolling control for the steel group of CHONGQING.