Research And Development About The Control System Of 300m~2 Sintering Machine

Based on the current situation and development of controlling system of sintering machine at home and abroad,this paper analyse detailedly on the process principle and craft characteristic of the sintering production. According to the situation of the sintering controlling system in domestic, the automation controlling system of 300m~2 sintering machine based on SIEMENS S7-400 series PLC and PROFIBUS filedbus is designed, and analyse the real-time problem of controlling system.According to control system demands of 300m~2 sintering machine, the thesis selected PLC of S7-300/400 series of Siemens as main controller to autocontrol produce process, and the commercial computer which is high performance as the monitor computer, which composed plural computer control system of 300m~2 sintering machine. According to the types select of sensor and transducer and the satistic mount of I/O of the control system of sintering machine, the thesis configured and select the types of control system hardwares and configured the hardwares of control system using Step7 V5.3 software. Then chose the CPU416-2DP and CPU315-2DP as the master of Profibus-DP and several ET200Ms as the slavers, and accomplish the communication.This thesis introduced the concept, property, typical protocols of PROFIBUS technology, and the consist of protocols, properties of PROFIBUS were researched. The paper mainly introduced the property, the function and the communication of PROFIBUS. Based on deep analyses on several key technologies, such as the cyclic scanning mechanism of PLC,data transmission services and MAC protocol of PROFIBUS, message transaction cycle time formulae are given for data exchanges between master and slave in normal run state. Furthermore, the response time between master and I/O slave, is analyzed respectively.Finally, for a control system of 300m~2 sintering machine, considered I/O response lag of PLC and the time delay properties of network, real-time property of the control system is analyzed. The application in the project shows that the real-time of the control system can completely obtain guarantee and the analytical method is of great value in practice.