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</div> </div>    <div class="4olha7i" id="container"> <section> <article> <h1>PROFIBUS-DP 和 PROFINET 的拓?fù)湫阅?/h1> <div id="r972pcb" class="authorTimeSource"> <span>作者：</span> <span>時間：2016-12-14</span> <span>來源：網(wǎng)絡(luò)</span> <link rel="stylesheet" type="text/css"/> <span style="float:right; width:130px;margin-right:0px; text-align:right;"> <div id="ovpia77" class="nav0"> <ul> <li><a href="javascript:void(0);"><img src="http://cafeforensic.com/event/action/images/icon_add_4.png" width="20" border="0" align="absmiddle" />加入技術(shù)交流群</a> <ul> <li style="text-align:center;"><img src="http://cafeforensic.com/event/company/images/code_1.jpg" width="130"><br />掃碼加入<br />和技術(shù)大咖面對面交流<br />海量資料庫查詢</li> </ul> </li> </ul> </div> </span> <span style="float:right; width:30px;margin-right:0px; text-align:right;"><a rel="nofollow">收藏</a></span> </div> <div id="9fhv2qk" class="hAd4_Afinal20a_back">  <iframe id='a890e388' name='a890e388' src='https://ad.eepw.com.cn/www/delivery/afr.php?zoneid=88&cb=INSERT_RANDOM_NUMBER_HERE' frameborder='0' scrolling='no' width='660' height='60'><a target='_blank'><img src='https://ad.eepw.com.cn/www/delivery/avw.php?zoneid=88&cb=INSERT_RANDOM_NUMBER_HERE&n=a635e61e' border='0' alt='' /></a></iframe> </div> <div style="margin-top:28px;"></div> <div id="4azq75x" class="content" id="contentDiv" style="position:relative;"> <div id="twv4001" class="ad_300x180_Afinal13_back">  <iframe id='a225770a' name='a225770a' src='https://ad.eepw.com.cn/www/delivery/afr.php?zoneid=87&cb=INSERT_RANDOM_NUMBER_HERE' frameborder='0' scrolling='no' width='300' height='200'><a target='_blank'><img src='https://ad.eepw.com.cn/www/delivery/avw.php?zoneid=87&cb=INSERT_RANDOM_NUMBER_HERE&n=a576c0a2' border='0' alt='' /></a></iframe> </div> <span id="contentlabels" style="font-size:14px;">【線型網(wǎng)絡(luò)】<p>DP線型網(wǎng)絡(luò)中的一個或幾個節(jié)點斷電，DP線型網(wǎng)絡(luò)還是有可能是通的，后續(xù)節(jié)點的通訊有可能是不受影響的；</p>本文引用地址：<a href="http://cafeforensic.com/article/201612/330078.htm">http://cafeforensic.com/article/201612/330078.htm</a><p>PN線型網(wǎng)絡(luò)中間節(jié)點斷電，后續(xù)節(jié)點肯定都不通了，這就是PN網(wǎng)絡(luò)為什么一定要搞MRP介質(zhì)冗余環(huán)網(wǎng)的原因。PN即使有了MRP介質(zhì)冗余環(huán)網(wǎng)，有些情況下還是不如DP，比如線型網(wǎng)絡(luò)中的若干個節(jié)點中夾花兒的斷電，那么DP網(wǎng)絡(luò)中，只要沒斷電的還是有可能通訊上的，但PN即使是環(huán)網(wǎng)，夾在2個斷電節(jié)點間的站都是不能通訊的。</p><p><wbr /></p><p>【DP與PN線型網(wǎng)絡(luò)的性能比較】</p><p>DP線型網(wǎng)絡(luò)和PN介質(zhì)冗余單環(huán)網(wǎng)相比較：1、當(dāng)1個從站節(jié)點斷電，兩者性能相當(dāng)；2、當(dāng)大于2個從站節(jié)點斷電時，DP線型網(wǎng)絡(luò)性能似乎還要大于等于PN的介質(zhì)冗余單環(huán)網(wǎng)。甚至于拔下DP插頭，DP<strong>總線</strong>還是通的（只要不是打上終端電阻的）。</p><p><wbr /></p><p>【基于交換機才能做到發(fā)揮PN網(wǎng)絡(luò)的優(yōu)勢】<br />從站節(jié)點大于3個的PN網(wǎng)絡(luò)的可靠性，必須通過交換機來實現(xiàn)，星型結(jié)構(gòu)或者多重環(huán)網(wǎng)冗余結(jié)構(gòu)，換言之，PN網(wǎng)絡(luò)就是基于交換機的網(wǎng)絡(luò)。PN很快會成為<strong>現(xiàn)場總線</strong>的主流，要設(shè)計可靠的基于PN總線的控制系統(tǒng)，我們必須全面地了解PN總線的特性，任何片面的應(yīng)用都會給我們帶來不小的損失。例如不重視PN交換機。</p><p><wbr /></p><p>【FESTO的PN節(jié)點】</p><p>CPX-FB33、CPX-M-FB34、CPX-M-FB35、CTEU-PN</p></span>  <div class="ui5i9t4" id="coverDiv" class="article_reg" style="width:100%;overflow:hidden;display:none;z-index:10;position:absolute;left:0;background:#fff;"> <center> <img src="https://webstorage.eepw.com.cn/images/display/reg.jpg" border="0" usemap="#Map" /> <map name="Map" id="Map"> <area shape="rect" coords="133,235,319,253" target="_blank" /> <area shape="rect" coords="132,315,319,335" /> </map> </center> </div>  <span id="ydzvljw" class="hAd8"> <br></span>   </div> </article> <div id="ouoicsq" class="clear"></div> <br/> <div id="scw460x" class="hAd6"> <div class="gdz26k4" id="relA" style="width:auto;height:auto;"> <ul> <li>  <iframe id='af71d594' name='af71d594' src='https://ad.eepw.com.cn/www/delivery/afr.php?zoneid=114&cb=INSERT_RANDOM_NUMBER_HERE' frameborder='0' scrolling='no' width='650' height='30'><a target='_blank'><img 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