The Research And Realization Of Coal-Preparation Control System In Coking Plant Based On PLC

PLC, Network and field bus technique speedily development changes traditional control structure of the automation territory, and the business information system that takes the integrated automation of PLC as the base takes shape gradually.The precondition of coking process is a self-contained coal-preparation system, which transplants the mixed coal to tower as the source for coking. Then a new process control system based on PCS7 is presented as the solution to the coal-preparation process,and it has been used in practice.Some problems based on the working flows of the coking process are analyzed and the control functions are put forward. Then the whole structure of the systems including the hardware and software frame is built. Through the plc networks, make up of a two levels computer control system using the protocol of field bus. In the thesis, some new approach of reducing eliminating interfering signal is present.A new process control system pcs7 is adopted as the developing platform,real-time supervision systems are developed under windows and the industrial configuration software WinCC to get and store the data.The S7 automatic system as the control units realizes the process control,receives the local sensor signals with the distributed I/O. The real run results show that the system is designed dependably and practicably,which satisfies the industrial requirements.