廈門(mén)市泰尼電器有限公司
主營(yíng)產(chǎn)品: AB模塊PLC |
廈門(mén)市泰尼電器有限公司
主營(yíng)產(chǎn)品: AB模塊PLC |
參考價(jià) | 面議 |
聯(lián)系方式:張工查看聯(lián)系方式
更新時(shí)間:2018-05-25 11:47:50瀏覽次數(shù):194
聯(lián)系我們時(shí)請(qǐng)說(shuō)明是環(huán)保在線上看到的信息,謝謝!
PLC控制和DCS控制系統(tǒng)不是一個(gè)邏輯層次上的概念,從名稱(chēng)上就能看出:PLC是以功能命名,DCS是以體系結(jié)構(gòu)命名。從原理上看 PLC就可以組成DCS。當(dāng)然兩者性能差異還是存在的,要具體看產(chǎn)品和需要。從應(yīng)用角度來(lái)說(shuō),簡(jiǎn)單地以 PLC,DCS來(lái)區(qū)分,往往會(huì)走人誤區(qū)。
DCS控制系統(tǒng)與PLC控制區(qū)別: DCS是一種“分散式控制系統(tǒng)",而 PLC(可編程控制器)只是一種控制“裝置",兩者是“系統(tǒng)"與“裝置"的區(qū)別。系統(tǒng)可以實(shí)現(xiàn)任何裝置的功能與協(xié)調(diào),PLC裝置只實(shí)現(xiàn)本單元所具備的功能。
DCS網(wǎng)絡(luò)是整個(gè)系統(tǒng)的中樞神經(jīng),DCS系統(tǒng)通常采用的標(biāo)準(zhǔn)協(xié)議 TCP/IP。它是安全可靠雙冗余的高速通訊網(wǎng)絡(luò),系統(tǒng)的拓展性與開(kāi)放性更好.而 PLC因?yàn)榛旧隙紴閱蝹€(gè)小系統(tǒng)工作,在與別的PLC或上位機(jī)進(jìn)行通訊時(shí),所采用的網(wǎng)絡(luò)形式基本都是單網(wǎng)結(jié)構(gòu),網(wǎng)絡(luò)協(xié)議也經(jīng)常與標(biāo)準(zhǔn)不符。在網(wǎng)絡(luò)安全_匕 PLC沒(méi)有很好的保護(hù)措施。
1746-NI8--1746-NI8
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