1746-OV8 1746-OV8
1746-OV81746-OV8profibus dp網(wǎng)絡(luò)有et200m和hmi，兩者的通信協(xié)議不一樣。為什么可以在一塊運(yùn)行，這樣做是不是對(duì)于et200m和cpu的通信速度有影響呢，感覺hmi和plc通信的速度要慢一些相對(duì)于et200m
westcowboy: ET200M與PLC通信，其中的IO數(shù)據(jù)更新方式為循環(huán)數(shù)據(jù)交換；而HMI與PLC通信，IO數(shù)據(jù)更新為非循環(huán)數(shù)據(jù)交換。這是2者數(shù)據(jù)更新速度不一樣的根本原因。
另外，PLC與ET200M通過DP通信，走的協(xié)議是Profibus-DP；而PLC與HMI通信，通常走的是S7通信。
HITIAR: 還要從網(wǎng)絡(luò)模型上說起，總線是物理層和鏈路層上的東西，是傳輸介質(zhì)和電氣規(guī)程約定。協(xié)議是傳輸層上的東西，實(shí)際就是通信約定，是需要通信設(shè)備之間能聽懂的交流語言。就像我們大家說話一樣，可以通過電話傳播語音，也可以通過空氣或其它方式傳播，至于我們說的是漢語還是哪種語言，只要通話的人能聽懂就行了。所以同一條總線跑不同的協(xié)議是正常的。
【公 司】： 廈門泰尼電氣有限公司
【主 營(yíng)】： AB、GE、施耐德等各類PLC產(chǎn)品
【價(jià) 格】： 電議
【發(fā)布人】： 張亮
【電 話】： 18030028083
【所在地】： 福建 - 廈門
【座 機(jī)】： 0592-6809819
【來 源】： 供應(yīng)信息 > 電工、電氣 > PLC
【Q Q】： 2314094943
再舉個(gè)例子：以太網(wǎng)大家都很熟悉，通過網(wǎng)線和交換機(jī)構(gòu)成了一個(gè)網(wǎng)絡(luò)，設(shè)備可以收發(fā)電子郵件，可以下載，可以瀏覽等，這就同時(shí)使用了HTTP、FTP、SMTP等協(xié)議。
所以同一條總線跑不同的協(xié)議是正常的?？偩€和協(xié)議本身就是兩回事，不用太糾結(jié)。這就是建立網(wǎng)絡(luò)模型的好處。
小釉：這樣做是不是對(duì)于et200m和cpu的通信速度有影響呢？
HITIAR:舉個(gè)例子說，高速公路限速160公里，可以跑轎車也可以跑貨車。影響車速的原因有哪些呢？發(fā)動(dòng)機(jī)和公路擁堵哪個(gè)是主因呢？所以，通信速率是由控制器的運(yùn)算能力和通信設(shè)備端口設(shè)計(jì)以及對(duì)端設(shè)備的通信速率來決定的，網(wǎng)絡(luò)只是規(guī)定了一個(gè)最高通信速率而已。
西門子的設(shè)備的通信也是遵循這些原理的，至于每一種通信協(xié)議具體是如何約定的我就不能說明白了。
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