6ES72970AX300XA0
6ES72970AX300XA0
6ES72970AX300XA0
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6ES72970AX300XA0
10、100 Mb/s的快速以太網(wǎng)已開始廣泛應(yīng)用，1Gb/s以太網(wǎng)技術(shù)也逐漸成熟，而傳統(tǒng)的現(xiàn)場總線最高速率只有12Mb/s。顯然，以太網(wǎng)的速率要比傳統(tǒng)現(xiàn)場總線要快的多，完全可以滿足工業(yè)控制網(wǎng)絡(luò)不斷增長的帶寬要求。
（三）成本低廉
以太網(wǎng)網(wǎng)卡的價(jià)格較之現(xiàn)場總線網(wǎng)卡要便宜得多（約為1/10）；另外，以太網(wǎng)已經(jīng)應(yīng)用多年，人們對以太網(wǎng)的設(shè)計(jì)、應(yīng)用等方面有很多經(jīng)驗(yàn)，具有相當(dāng)成熟的技術(shù)。大量的軟件資源和設(shè)計(jì)經(jīng)驗(yàn)可以顯著降低系統(tǒng)的開發(fā)和培訓(xùn)費(fèi)用，降低系統(tǒng)的整體成本，并大大加快系統(tǒng)的開發(fā)和推廣速度。
（四）資源共享能力強(qiáng)
隨著Internet/ Intranet的發(fā)展，以太網(wǎng)已滲透到各個(gè)角落，網(wǎng)絡(luò)上的用戶已解除了資源地理位置上的束縛，在聯(lián)人互聯(lián)網(wǎng)的任何一臺計(jì)算機(jī)上就能瀏覽工業(yè)控制現(xiàn)場的數(shù)據(jù)，實(shí)現(xiàn)“控管一體化”，這是其他任何一種現(xiàn)場總線都無法比擬的。
（五）可持續(xù)發(fā)展?jié)摿Υ?/span>
以太網(wǎng)的引人將為控制系統(tǒng)的后續(xù)發(fā)展提供可能性，用戶在技術(shù)升級方面無需獨(dú)自的研究投入，對于這一點(diǎn)，任何現(xiàn)有的現(xiàn)場總線技術(shù)都是無法比擬的。同時(shí)，機(jī)器人技術(shù)、智能技術(shù)的發(fā)展都要求通信網(wǎng)絡(luò)具有更高的帶寬和性能，通信協(xié)議有更高的靈活性，這些要求以太網(wǎng)都能很好地滿足。
3、工業(yè)以太網(wǎng)在控制領(lǐng)域應(yīng)用現(xiàn)狀
工業(yè)以太網(wǎng)與現(xiàn)場總線相比，它能提供一個(gè)開放的標(biāo)準(zhǔn)，是企業(yè)從現(xiàn)場控制到管理層實(shí)現(xiàn)全面的無縫的信息集成，解決了由于協(xié)議上的不同導(dǎo)致的“自動(dòng)化孤島”問題，但從目前的發(fā)展看，工業(yè)以太網(wǎng)在控制領(lǐng)域的應(yīng)用主要體現(xiàn)在以下幾種形式。
（一）混合EtherNet/Fieldbus的網(wǎng)絡(luò)結(jié)構(gòu)
這種結(jié)構(gòu)實(shí)際上就是信息網(wǎng)絡(luò)和控制網(wǎng)絡(luò)的一種典型的集成形式。以太網(wǎng)正在逐步向現(xiàn)場設(shè)備級深入發(fā)展，并盡可能的和其他網(wǎng)絡(luò)形式走向融合，但以太網(wǎng)和TCP/IP原本不是面向控制領(lǐng)域的，在體系結(jié)構(gòu)、協(xié)議規(guī)則、物理介質(zhì)、數(shù)據(jù)、軟件、實(shí)驗(yàn)環(huán)境等諸多方面并不成熟，而現(xiàn)場總線能完全滿足現(xiàn)代企業(yè)對底層控制網(wǎng)絡(luò)的基本要求，實(shí)現(xiàn)真正的全分布式系統(tǒng)。因此，在企業(yè)信息層采用以太網(wǎng)，而在底層設(shè)備級采用現(xiàn)場總線，通過通信控制器實(shí)現(xiàn)兩者的信息交換。
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