E0451-680-004
E0451-680-004
E0451-680-004
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現(xiàn)場總線是一種主要針對工業(yè)現(xiàn)場的智能化儀表、控制器之間的通信以及其與高級控制系統(tǒng)之間的通信問題而產(chǎn)生的工業(yè)數(shù)據(jù)總線。具體來說，
1系統(tǒng)概況
在本污水廠中，整個廠區(qū)的控制是由兩個PLC控制站完成的。這兩個控制站都是ABB公司生產(chǎn)的，型號為AC500系列。該系統(tǒng)的優(yōu)點(diǎn)較為突出，主要有信號強(qiáng)、系統(tǒng)穩(wěn)定性好、成本較低。它們在對廠區(qū)進(jìn)行實(shí)時監(jiān)控的過程中發(fā)揮著不可替代的重要作用。
2系統(tǒng)的具體結(jié)構(gòu)
該污水廠的網(wǎng)絡(luò)結(jié)構(gòu)為雙層網(wǎng)絡(luò)，上層為以太網(wǎng)，該網(wǎng)的特點(diǎn)主要是應(yīng)用范圍較大且數(shù)據(jù)傳送速度更快；底層使用的是Profibus-DP總線。PLC站使用的是netb光纖收發(fā)器，中控室則和PLC站相同。光纖連接使得數(shù)據(jù)傳輸系統(tǒng)更加穩(wěn)定，傳輸距離更遠(yuǎn)，而且其他設(shè)備無法對其造成干擾。而兩個PLC控制站都有Profibus-DP通訊模塊CM572-DP，其作用是讓主反應(yīng)區(qū)進(jìn)行水質(zhì)檢測的儀表、流量計(jì)、加氯間以及污泥脫水機(jī)房等進(jìn)行無障礙數(shù)據(jù)傳輸。
本廠的Profibus-DP使用的結(jié)構(gòu)是線形。具體來說是先使用一根總線將控制器與受控對象連接起來，并將總線電纜與現(xiàn)場各設(shè)備連接?？刂破鲗λ蠭/O站上的數(shù)據(jù)輸入進(jìn)行控制，
———冷門的備品備件聯(lián)系我們——————
———停產(chǎn)的備品備件聯(lián)系我們——————
福建光沃自動化設(shè)備有限公司
聯(lián)系人 ：歐工（銷售經(jīng)理）
手機(jī) ：18030229053
電話 ：0592-5709825
QQ ：2479261344
郵箱 ：2479261344@qq.com
傳真 ：0592-5917519
信用=財(cái)富 誠信=財(cái)富 共贏=財(cái)富
現(xiàn)場總線就是將以往的4-20mA模擬信號以及普通開關(guān)量信號的傳輸替換為數(shù)字化信息傳輸?，F(xiàn)場總線具有系統(tǒng)穩(wěn)定、成本較優(yōu)以及操作簡單等優(yōu)勢，因此發(fā)展速度較快。本文主要以Profibus-DP現(xiàn)場總線為例，對某污水廠的相關(guān)情況進(jìn)行了論述。就目前而言，越來越多的污水廠使用了智能儀表及現(xiàn)場總線。
在某些情況下還能將信息傳送至輸出通道，使得通信方式既包括主從式通信，又包括對等式通信?？刂葡到y(tǒng)的Profibus-DP總線的主站是AC500系列PLC。它與其他設(shè)備之間的連接靠總線來實(shí)現(xiàn)，中間設(shè)備DP頭的終端電阻在OFF的位置；反之，終端設(shè)備的在ON位置。
DWYER TEMPERATURE CONTROLLER SERIES 2500 M# D25013
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