《基于PLC的分布式控制系统毕业设计论文》.docVIP

PAGE PAGE ３４ 摘 要 介绍了某棒材热连轧主轧线PLC控制系统的基本结构, 可编程控制器（PLC）的发展历程、应用领域、发展前景及各种PLC的特点以及PLC的工作原理。设计中利用PLC控制系统，分布式I/O系统及系统通讯实现了现代工业的自动化。PLC控制系统将采用德国SIEMENS公司S7系列的PLC实现棒材生产线的各种规格产品的轧制速度设定、速度级联调节、微张力控制、活套高度控制、飞剪的切头／切尾控制、精轧后水冷输出辊道控制、冷床入辊道控制、上钢装置及步进冷床控制等。 同时设计中详细地设计了系统的PLC 的系统配置、应用软件的控制。另外是PLC控制系统采用的是分布式结构，将部分控制功能分散到控制器T400中，即把PLC部分功能分解下放，这样减轻了PLC的负担，提高了系统的速度，增强了系统的稳定性。 系统的投人大大提高了生产和管理的自动化水平，减少了故障发生率，提高了劳动生产率，创造了较大的经挤效益。 关键字:PLC ，分布式控制系统，棒材热连轧 Abstract The text has recommended the basic structure of some excellent hot roll line, the development course of PLC, application area, development prospect, operation principles and different characteristic to PLC. The design uses the control system of PLC, distributed I/O system and communication system to realize the automation of modern industry. The control system of PLC adopts S7 of series of SIEMENS of Germany to realize the rolling speed establishment of excellent material of different specification products, regulation of one grade of antithetical couplets of speed, tension control, kink height control, fly cut not to cut hair / cut tail control, water-cooling output roller dish control, cold bed enter roller dish control, have steel device and so on. At the same time, the design has designed the control of system disposing , application software of systematic PLC in detail. It is distributed structure that what PLC control system is adopted in addition, and will control the function and disperse in controller T400 partly, namely resolve PLC some functions to transfer, lighten the burden of PLC like this, it has improved the systematic speed and have strengthened systematic stability. The large devotion has improved systematic automatic level of production and management greatly, has reduced the trouble incidence, has raised labour productivity, and has created the greater one through crowding benefits. Keywords: PLC, Distributed control system, excellent hot roll line basic structure 目 录 TOC \o 1-3 \h \z HYPERLINK \