300MN模锻水压机控制系统通讯网络设计与研究

【作者】 苏勇；

【导师】 谭建平；

【作者基本信息】 中南大学 ， 机械电子工程， 2006， 硕士

【摘要】 随着我国航天事业的不断发展以及国防现代化的需求，对我国高精度、大吨位的锻造液压机控制水平提出了更高的要求。300MN模锻水压机是目前亚洲最大的模锻液压机，是我国国防和基础建设的关键设备。然而，水压机现有操纵系统已经老化，不能适应目前的智能化控制方式，对水压机的改造势在必行。随着现场总线技术及控制网络技术的炙手可热，其对自动化领域的影响带来的是观念的彻底更新和控制体系的彻底变革，因此将控制网络技术引入水压机操纵系统改造，其研究意义是非常巨大的。本文深入学习和掌握了PROFIBUS现场总线技术，针对300MN模锻水压机控制信号种类繁多、复杂的特点，从系统可靠性、兼容性和扩展性考虑，选取了PROFIBUS-DP现场总线；采用模块化思想，实现分散控制，构造了基于主站S7-300、从站S7-200 PLC的水压机分布式控制网络和同步系统MPI网络。根据可靠性工程的可维护性和工业现场实际要求，设计了操纵系统PROFIBUS-DP网络和同步系统MPI网络进行通讯故障诊断系统，设计了友好的故障报警界面，以便系统故障诊断和故障查询，提高了系统的可维护性。对操纵系统PROFIBUS网络时延进行了分析研究，按照时间驱动的方式简化了所构建控制网络，求得水压机控制系统最大网络通讯延迟时间，分析了网络延时对控制系统性能的影响。仿真研究表明，网络延迟可能引起控制系统超调、振荡，从而对水压机操纵的性能造成不良影响，在设计网络控制系统时必须对其网络延迟进行补偿。更多还原

【Abstract】 With the constant development of the space cause of our country and demand of the modernization of national defense, the higher precision and larger tonnage hydraulic press machine of our country have been put forward higher demand to the control level. The 300MN hydraulic press machine is the biggest machine in Asia at present; it is national defense of our country and key equipment of capital construction. However, the control system of the hydraulic press machine at present has already worn out; it can’t meet the present intelligent control method, so the transformation to the hydraulic press is imperative. As the quick development of Field bus and net control system, it has completely changed the structure of control system, so introducing Field bus and net control system to the transformation of the hydraulic press, its research meaning is very enormous.This paper has discussed in depth to study and master the PROFIBUS fieldbus.Considering a wide variety of complex features, such as system reliability, compatibility and scalability, PROFIBUS-DP has been selected as the system fieldbus. Considering modular configuration and decentralized control, the net control system based on PROFIBUS-DP &MPI including operate system and synchronization system between PLCs has been constructed, in which S7-300 is as the master station while S7-200 is as the slave station.According to the reliability and maintainability of the actual industrial scene.The network fault diagnosis system between operate system based on PROFIBUS-DP and synchronization based on MPI has been constructed.the fault alarm interface is designed friendly for fault diagnosis and fault inquiries.and this work inmprove the maintainability of the control system.The delay of network control system based on PROFIBUS-DP has been analysized.According to the time-driven approach,the control system has been simplified.and the maximum network delay has been calculated.The influence on system performance from network delay time has been considered.Simulation results show that the network delay of control system may lead to over-regulation, oscillation; and this may lead harmful effects to the performance of operate system. So we must take the network delay into account and compensate the network delay when constructing a network control system.更多还原