【作者】 文鹏；

【导师】 白瑞祥；

【作者基本信息】 天津科技大学 ， 检测技术与自动化装置， 2008， 硕士

【摘要】 本文以造纸过程中的抄纸工艺流程为对象,设计了基于IPC-PLC的抄纸过程智能监控系统,包括现场PLC程序控制系统、上位计算机监控系统、高级智能控制系统以及它们之间的通讯系统。文中分别介绍了各个系统的硬件配置及其功能的软件实现。该项目现场控制系统采用的是德国SIEMENS公司的S7-300系列PLC做下位控制器,完成数据采集和对生产工艺的控制。运用与之相配的STEP?编程软件,通过STL和LAD编程语言编制了现场PLC的控制程序,从而使纸浆流送、纸机传动、蒸汽供汽、水分定量四个子系统可以按照生产工艺的要求实现自动控制生产流程。运用性能稳定、抗干扰性能好的研华工控机作为监控系统上位机。采用同是SIEMENS公司的WinCC工控组态软件对上位机监控功能进行组态和人机界面的设计,实现现场数据实时记录、显示和监控,设计了工艺流程画面、记录查询画面、报警画面、报表打印画面、参数设定画面、实时曲线显示画面等操作显示画面。针对生产过程中被控对象——水分、定量具有非线性,大滞后、强耦合等特点,采用模糊控制策略并结合专家控制算法对其进行控制,并利用WinCC的全局脚本编程实现此控制算法。并通过MATLAB进行仿真与传统PID控制的仿真结果进行了比较,表明了此控制策略提高了控制精度,满足了生产工艺要求。系统控制室中的上位工控机通过基于TCP/IP协议的工业以太网与下位PLC进行通讯,而下位PLC之间通过MPI进行通信,此控制系统不但发挥了不同设备各自的优势,缩短了工程时间、降低了人力物力消耗,而且可方便与管理控制中心进行联系,实现了管控一体化。更多还原

【Abstract】 The paper is based on the project of paper-making process, which is belongs to ShanDong De Zhou paper-making factory, the network monitoring system which is based on IPC-PLC has been designed, the control system includes PLC program control system. computer supervision system. intelligent control system and the communication system between the upper and lower computer. Besides the hardware configuration and software achievement had been introduced.In this project, the field control system used by the German company SIEMENS S7-300 PLC to make controller, and the lower station complete data acquisition and control of the production process. With the help of the corresponding programming software STEP7 and the programming language STL and LAD, program the control system, so that, the monitoring system can make sure the flow of paper pulp, the drive of paper-making machine, the steam supply of pump, the control of moisture and weight and ammonia recovery process workshop in accordance with the demands of production process.Using high stabilization and good anti-jamming performance industrial personal computer (IPC) as upper computer, WinCC software, which is also a product from SIEMENS, is used to configure the supervisory software and design the Human Machine Interface (HMI), and realizes the real-time data-logging, supervising and controlling, as well as various HMI such as technologic flow, record checking, alarming, reporting, parameter setting, real-time curving and so on.In the view of the production process object-density of nonlinear and delay characteristics, so the fuzzy PID control strategy and expert control is applied to control this variable. And use the Global Script of WinCC software to develop the self-adjusting fuzzy PID control algorithm. And the simulation results of fuzzy PID control strategy are compared with the PID strategy, the results show that control strategy improves the accuracy of control variable and meet the technical requirements.PLC and IPC in the central control room is communicated via Industrial Ethernet based on TCP/IP, MPI is used in communication between the PLC. This control system not only to makes profit of the unique merits of PLC and IPC, but also realizes integrating management and control.更多还原