基于PLC和变频器的多电机同步控制系统的标准化设计1.docx

基于PLC和变频器的多电机同步控制系统的标准化设计摘要随着电力电子技术和自动控制技术等的飞速发展，电动机的调速已经从继电器控制时代发展到今天的由变频器控制调速的时代，且在工业各个领域中得到了极为广泛的应用。在工业控制实际生产工艺中，往往对多台电机的同步控制有了较高的要求。比如造纸工艺要求中设备传动时应保证纸在各部分传送时具有恒定的速度及恒定的张紧度，这就使多电机同步控制的研究有了必要性。本文重在阐述PLC和变频调速相关知识，并且利用该部分知识对由PC机、西门子PLC、变频器、异步电机等构成的多电机同步控制系统进行总结研究。文中通过RS485接口的USS协议实现了PLC与变频器的串行通信，S7-200型PLC可以实时读取和设置变频器的相关参数，通讯速率较高。同时还详细讨论了上位机与西门子S7-200型PLC串口通信的条件以及运用高级语言编写PLC与PC机通信的接口程序原理等。利用PLC自由端口通信方式实现与上位机的串行数据传输，将变频器的信息通过S7-200实时传送到上位机中，实现了计算机与PLC的实时通信，利用PLC自身所具备的逻辑运算和数据处理功能。关键词：变频器，PLC，造纸机，同步控制，USS协议Standardized Design of The PLC and Inverter-based Multi-motor Synchronous Control SystemABSTRACTWith the rapid development of power electronics and automatic control technology, such as motor speed from the relay control era to todays era of speed control by inverter, and a very wide range of applications in various fields of industry. The actual production process in industrial control, often have high requirements for synchronous control of multiple motors. Such as papermaking process requires equipment in transmission should ensure that the paper with a constant speed and constant degree of tension in various parts of transmission, which makes the multi-motor synchronous control of the study of necessity.This article focuses on elaborate knowledge of the PLC and frequency control, and the part of the knowledge constituted by the PC, Siemens PLC, inverter, induction motor and other multi-motor synchronous control system to summarize research. USS protocol via the RS485 interface the PLC and inverter serial communication, S7-200 PLC real-time read and set the drive parameters, the higher communication speed. Also discussed in detail the PC and Siemens S7-200 PLC serial port communication conditions as well as the use of high-level language to write the PLC and PC communication interface program principles. PLC free port communication with the host computer serial data transmission, the information of the inverter by the S7-200 real-time transmission to the host comp