先進(jìn)制造技術(shù)英文版第一章-資料下載頁(yè)
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【正文】 ctives from Level 2 Primary, fastacting 2 Supervisory Control Tie together processes dynamically Humanoriented, More slowly 3 Management Control Control entire system In order of days The definition of distributed control system Distributed Control Supervisory and administration functions, where realtime munication is not so critical, must not interfere with the timecritical control loop. Distributed Control Q1: What is the definition of Communication? the transmission of intelligence between points of origin and reception without alteration of sequence or structure of the information. Q2: What is data munication? the movement of puterencoded information by means of electrical transmission Plant Communication Q3: What is the heart of munication system? puters Q4: How to choose a controller? the Controller should be efficient in the performance of their assigned responsibility Plant Communication Summary A key munication issue is access to the uptotheminute data to eliminate costly errors, to improve product quality and to improve productivity. Plant Communication Network Architectures Link Controls Area Networks Hardware ? Definition the physical equipment ? Examples puter, terminals, machines, controllers, modems, 大亞 華為 新橋 調(diào)制解調(diào)器（即 Modem），是計(jì)算機(jī)與電話(huà)線(xiàn)之間進(jìn)行信號(hào)轉(zhuǎn)換的裝置，由調(diào)制器和解調(diào)器兩部分組成，調(diào)制器是把計(jì)算機(jī)的數(shù)字信號(hào)（如文件等）調(diào)制成可在電話(huà)線(xiàn)上傳輸?shù)穆曇粜盘?hào)的裝置，在接收端，解調(diào)器再把聲音信號(hào)轉(zhuǎn)換成計(jì)算機(jī)能接收的數(shù)字信號(hào)。通過(guò)調(diào)制解調(diào)器和電話(huà)線(xiàn)就可以實(shí)現(xiàn)計(jì)算機(jī)之間的數(shù)據(jù)通信。 作用是利用模擬信號(hào)傳輸線(xiàn)路傳輸數(shù)字信號(hào)。 Definition a set of programs Examples CWS,AP,OS,DBMS 軟件主要是指支持系統(tǒng)運(yùn)行并對(duì)系統(tǒng)進(jìn)行管理和控制的程序系統(tǒng)。 實(shí)時(shí)軟件 系統(tǒng)軟件 應(yīng)用軟件 開(kāi)發(fā)軟件 ? Definition A protocol is a formal set of conventions about the format and content of messages to be changed. ? Function establish munications exchange data terminate munications 網(wǎng)絡(luò)協(xié)議即網(wǎng)絡(luò)中（包括互聯(lián)網(wǎng)）傳遞、管理信息的一些規(guī)范。 常見(jiàn)的協(xié)議有： TCP/IP協(xié)議、 IPX/SPX協(xié)議、NetBEUI協(xié)議等。在局域網(wǎng)中用得的比較多的是 IPX/SPX。用戶(hù)如果訪(fǎng)問(wèn) Inter，則必須在網(wǎng)絡(luò)協(xié)議中添加 TCP/IP協(xié)議。 TCP/IP是“ transmission Control Protocol/Inter Protocol”的簡(jiǎn)寫(xiě)，中文譯名為傳輸控制協(xié)議 /互聯(lián)網(wǎng)絡(luò)協(xié)議）協(xié)議， TCP/IP（傳輸控制協(xié)議 /網(wǎng)間協(xié)議）是一種網(wǎng)絡(luò)通信協(xié)議，它規(guī)范了網(wǎng)絡(luò)上的所有通信設(shè)備，尤其是一個(gè)主機(jī)與另一個(gè)主機(jī)之間的數(shù)據(jù)往來(lái)格式以及傳送方式。TCP/IP是 INTERNET的基礎(chǔ)協(xié)議，也是一種電腦數(shù)據(jù)打包和尋址的標(biāo)準(zhǔn)方法。 Link Controls asynchronous synchronous 定義： 同步通信要求接收端時(shí)鐘頻率和發(fā)送端時(shí)鐘頻率一致。發(fā)送端發(fā)送連續(xù)的比特流。 異步通信時(shí)不要求接收端時(shí)鐘和發(fā)送端時(shí)鐘同步。發(fā)送端發(fā)送完一個(gè)字節(jié)后，可經(jīng)過(guò)任意長(zhǎng)的時(shí)間間隔再發(fā)送下一個(gè)字節(jié)。 特點(diǎn)： 異步通信的通信開(kāi)銷(xiāo)較大，但接收端可使用廉價(jià)的、具有一般精度的時(shí)鐘來(lái)進(jìn)行數(shù)據(jù)通信。 Local Area Network ? Definition A data link is an installation of equipment that are operating in a particular way to permit information to be exchanged between installations. ? Classification asynchronous synchronous Workstation ? Phrases cable television tap=CATV有線(xiàn)電視接頭 infrared diodes for infrared paths 紅外線(xiàn)二極管用于紅外線(xiàn)傳輸 coaxial TV Cables同軸電視電纜 signaltonoise ratio信噪比 low signal radiation低信號(hào)輻射 low error rate低出錯(cuò)率 ? Definition Topology describes the surface layout of the elements prising the munication workthat is, it is the shape of the system. Broadband 2. Inter Services Supported by Inter Who Uses the Inter Inter Origins 演講完畢，謝謝觀看！
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