IC693MDL640

IC693MDL640

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〖廈門光沃自動(dòng)化設(shè)備有限公司 竭誠(chéng)為您服務(wù)〗   
〖：歐工         〗
〖(同號(hào))       〗
〖:  2479261344     〗
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【價(jià)格】如此低價(jià),* 
【貨期】大量現(xiàn)貨,下單后即可發(fā)貨
【質(zhì)量】*,進(jìn)口***
【保障】產(chǎn)品經(jīng)過(guò)專業(yè)檢測(cè)，質(zhì)保一年,15天包退換
【品牌】Allen-Bradley羅克韋爾、ABB、本特利Bently 3500系統(tǒng)卡件、GE、艾默生西屋等模塊卡件
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1）確定系統(tǒng)是用PLC單機(jī)控制，還是PLC聯(lián)網(wǎng)控制；確定系統(tǒng)是采用遠(yuǎn)程I/O還是本地I/O。主要根據(jù)系統(tǒng)的大小及用戶要求的功能來(lái)選擇。對(duì)于一般的中小型過(guò)程控制系統(tǒng)來(lái)說(shuō)，PLC單機(jī)控制已基本能夠滿足功能要求。但也可借鑒集散控制系統(tǒng)的理念，即將危險(xiǎn)和控制分散，管理與監(jiān)控集中。這樣可以大大提高系統(tǒng)的可靠性。

　　（2）是否需要與其它部分通信。一個(gè)完整的控制系統(tǒng)，至少會(huì)包括三個(gè)部分：控制器、被控對(duì)象和監(jiān)控系統(tǒng)。所以對(duì)于控制器來(lái)說(shuō)，至少要跟監(jiān)控系統(tǒng)之間進(jìn)行通訊。至于是否跟另外的控制單元或部門通訊要根據(jù)用戶的要求來(lái)決定。一般來(lái)說(shuō)，如果用戶沒(méi)有要求，也都會(huì)留有這樣的通訊接口。

　?。?）采用何種通信方式。一般來(lái)說(shuō)，在現(xiàn)場(chǎng)控制層級(jí)用PROFIBUS DP；而從現(xiàn)場(chǎng)控制層級(jí)到監(jiān)控系統(tǒng)的通訊用PROFINET。但有時(shí)候也可互相通用，根據(jù)具體情況選擇合適的通信方式。

　?。?）是否需要冗余備份系統(tǒng)。根據(jù)系統(tǒng)的所要求的安全等級(jí)，選擇不同的辦法。在數(shù)據(jù)歸檔時(shí)，為了讓歸檔數(shù)據(jù)不丟失，可以使用OS服務(wù)器冗余；在自動(dòng)化站（Automation Station，AS），為了使系統(tǒng)不會(huì)因故障而導(dǎo)致停機(jī)或不可預(yù)知的結(jié)果，可以使用控制器冗余備份系統(tǒng)。選擇適當(dāng)?shù)娜哂鄠浞?，可以使系統(tǒng)的可靠性得到大幅提高。

　　在進(jìn)行控制系統(tǒng)選型之前，首先考慮系統(tǒng)的網(wǎng)絡(luò)結(jié)構(gòu)是怎樣搭建的。

　　確定系統(tǒng)的操作站、過(guò)程控制站的數(shù)目和位置，相互之間是怎樣連接的。是否需要工業(yè)以太網(wǎng)交換機(jī)。

　　一般情況下，現(xiàn)場(chǎng)控制室和主控制室與電氣控制柜分別安放在兩個(gè)地方，且距離較遠(yuǎn)，為保證信號(hào)的穩(wěn)定可靠，會(huì)考慮用光纜來(lái)連接各自的交換機(jī)。同時(shí)，為了通訊線路的冗余，會(huì)考慮選用帶榮譽(yù)管理功能的工業(yè)以太網(wǎng)交換機(jī)，將現(xiàn)場(chǎng)操作站和過(guò)程控制站組成一個(gè)光纖環(huán)網(wǎng)。這樣，即使有一個(gè)方向的通訊斷開(kāi)，也可通過(guò)另一個(gè)方向繼續(xù)通訊。

　　對(duì)于過(guò)程控制站和現(xiàn)場(chǎng)信號(hào)之間的連接，傳統(tǒng)的連接方式是將現(xiàn)場(chǎng)信號(hào)直接通過(guò)硬件連接到過(guò)程控制站上。這樣如果距離太遠(yuǎn)，信號(hào)傳輸會(huì)有損耗，尤其是模擬量信號(hào)。且當(dāng)信號(hào)點(diǎn)很多時(shí)，布線也較復(fù)雜，浪費(fèi)材料。所以，一般需在現(xiàn)場(chǎng)安裝分布式I/O從站（如果現(xiàn)場(chǎng)為危險(xiǎn)區(qū)，需選用本質(zhì)安全型的分布式I/O從站），將現(xiàn)場(chǎng)信號(hào)直接連接到I/O從站上，在通過(guò)現(xiàn)場(chǎng)總線的方式將信號(hào)傳送到過(guò)程控制站。

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