【正文】 接受設(shè)備 發(fā)送設(shè)備 間隙任意 0100 1 0 10100100 1 0 11100110 1 0 1110 2 同步通信時(shí)要建立發(fā)送方時(shí)鐘對接收方時(shí)鐘的直接控制，使雙方達(dá)到完全同步。通過這次課題設(shè)計(jì)提高了自己獨(dú)立工作的能力和創(chuàng)造力，加強(qiáng)了對基礎(chǔ)及專業(yè)的運(yùn)用能力，讓我對 PLC 又加深一步的了解。在實(shí)際應(yīng)用中， PLC主機(jī)與擴(kuò)展模塊之間要進(jìn)行信息交換，PLC主機(jī)與其他主機(jī)或其他設(shè)備之間也經(jīng)常進(jìn)行信息交換。 Abstract With the development of puter work technology and factory automation degree rise ceaselessly, Open and multi function work munication requirements of PLC bee the essential condition. In practical application, the PLC host and extension module to exchange information between PLC host and other host, or other equipment also often exchange information. So through this topic design of munication between PLC and frequency converter means to get a preliminary understanding, this topic mainly to learn S7200 and Mitsubishi Inverter between the most basic means of munication. Access to information through the research protocol, S7200 and Mitsubishi Inverter serial port munication research. Set the task started learning S7200 and Mitsubishi Inverter munication format, by the PLC to start, stop, run the frequency of such instruction, to control the inverter operation and frequency output. In under the guidance of a mentor after several modifications, debugging set program ladder chart. Through this topic design improves their ability to work independently and creativity, strengthen the basic and professional skills, let I to PLC and to deepen the understanding of one pace. PLC as the core part of industrial automatic control, single programming and maintenance of relatively simple, while the industrial work munication requirements of both stability, rapidity, flexibility and patibility with third party equipment, so the industrial munication works bee industrial automation system settings and II the difficulties of implementation. Frequency converter and PLC in free port mode of munication, it has great flexibility, convenient for engineering application. III 目 錄 摘 要 .............................................................................................................................. I Abstract .......................................................................................................................... I 目 錄 .......................................................................................................................... III 第一章 緒論 ..................................................................................................................1 串行通信基本概念及特點(diǎn) ....................................................................................... 1 串行通信的分類 ..................................................................................................... 1 通信協(xié)議 .................................................................................................... 2 通信設(shè)備 .................................................................................................... 3 第二章 PLC 的自由口串行通信 .................................................................................5 自由口指令及應(yīng)用 .................................................................................................. 5 自由口指令 ............................................................................................... 5 相關(guān)寄存器及標(biāo)志 ...................................................................................... 5 PLC的格式設(shè)定 ..................................................................................................... 7 第三章 變頻器通信 （本章由單璐所作） ..............................................................8 串行通訊功能 ......................................................................................................... 8 變頻器通信格式 ..................................................................................................... 8 第四章 程序 .........................................