| PVC has been widely used in industry, agricultural, commerce and other fields as a very ideal building material by its excellent characteristic, it has a good application prospect and huge market demand. Compared with the developed countries, there are still many problems in China's enterprises of PVC production, such as high running costs, high production strength, laggard control method. Carbide shipping and storing is the important process of PVC production, therefore using the distributed control system to implement advanced technology can be very vital for the next step.Relating calcium carbide shipping and storing in Inner Mongolia Elion chemical industry limited company's million-ton-a-year PVC production, based on the MTL8000 series hardware and Workbench, Mostview configuration software, this issue gives a method to implement the mutual integration of batch sequence logic control in the calcium carbide shipping and storing process with IEC 61131-3 industrial programming language. In the control strategy, the hybrid control strategy combined by order logic control and process control is mainly adopted, optimization control in local or whole devices has been realized, not only the assembly lines can be automatic adjusted, but also the energy can be reasonable distributed, the distribute control system have characteristics of flexible and extensible.Since the distributed control system ran in May 2008, it has been achieved the function of real-time monitoring in the assembly line, Not only realize the device's stabilization control and operation optimization, but also realize fault diagnosis and interlock protection. Not only reduce the labor intensity of operators, but also greatly improve the efficiency and reliability of carbide shipping and storing process. Having the good economic and social efficiency. |
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