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可编程逻辑控制PLC结合计算机技术、信号处理技术、控制技术和网络技术的成果，广泛应用在运动控制、过程控制等领域，并发挥着十分重要的作用。但在化工领域全过程生产线上进行在线配方和发泡使用PLC全自动控制技术国内仍在研制和开发阶段。
本课题运用SIMATIC Step7 编程工具在工业PLC平台上实现对六组份高压连续发泡系统的控制。论文绪论部分介绍可编程控制器PLC的发展与应用，以及SIEMENS s7-300的组成和特点；第二章详细叙述了六组份高压连续发泡系统的控制原理和特点；第三章叙述六组份高压连续发泡系统的逻辑控制流程，讲解、分析信号采集的部分程序；第四章为六组份高压连续发泡系统的硬件组态与电路；第五章介绍PLCSIM仿真情况和硬件调试结果。最后对毕业设计进行了总结。
关键字：PLC 高压发泡 闭环控制
The programmable logic control PLC combines a technical result of the calculator technique,the signal processing technique,the control technique and network, extensively applied Be exercising to control,process control etc. realm, erupt to flick a very important function.But go forward to go the on-line formulation and hair to steep the usage PLC a full-automatic control the technique domestic to develop still a stage with the development in the chemical engineering realm whole process production line.
This topic usage SIMATIC Step7 plait distance tool carries out to deliver a control of steep the system continuously to six sets of high pressures on the industrial PLC platform.The thesis introduction part introduces the development and application of the programmable controller PLC, and the SIEMENS s 7-300 of constitute with the characteristics;Chapter 2 control principle and characteristics that described six sets of high pressures in detail to deliver to steep system continuously;Chapter 3 high pressures with six sets of description deliver the logic control process of steep the system continuously, explaining in detail,analyze parts of procedures that the signal collect;Chapter 4 hardware set that delivers to steep system continuously for six sets of high pressures 态 and electric circuit;Chapter 5 introduction PLCSIM imitates the genuine feeling condition and hardware to adjust to try a result.Carried on summary to the graduation design finally.
Key word:The PLC high pressure hair bubble shuts a wreath control
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