描述
DCS一般都提供統(tǒng)一的數(shù)據(jù)庫(kù)。換句話說(shuō)，在DCS系統(tǒng)中一旦一個(gè)數(shù)據(jù)存在于數(shù)據(jù)庫(kù)中，就可在任何情況下引用，比如在組態(tài)軟件中，在監(jiān)控軟件中，在趨勢(shì)圖中，在報(bào)表中……而PLC系統(tǒng)的數(shù)據(jù)庫(kù)通常都不是統(tǒng)一的，組態(tài)軟件和監(jiān)控軟件甚至歸檔軟件都有自己的數(shù)據(jù)庫(kù)。為什么常說(shuō)西門子的S7 400要到了414以上才稱為DCS？因?yàn)槲鏖T子的PCS7系統(tǒng)才使用統(tǒng)一的數(shù)據(jù)庫(kù)，而PCS7要求控制器起碼到S7 414-3以上的型號(hào)。
從時(shí)間調(diào)度上來(lái)說(shuō)。
PLC的程序一般不能按事先設(shè)定的循環(huán)周期運(yùn)行。PLC程序是從頭到尾執(zhí)行一次后又從頭開(kāi)始執(zhí)行。（現(xiàn)在一些新型PLC有所改進(jìn)，不過(guò)對(duì)任務(wù)周期的數(shù)量還是有限制）而DCS可以設(shè)定任務(wù)周期。比如，快速任務(wù)等。同樣是傳感器的采樣，壓力傳感器的變化時(shí)間很短，我們可以用200ms的任務(wù)周期采樣，而溫度傳感器的滯后時(shí)間很大，我們可以用2s的任務(wù)周期采樣。這樣，DCS可以合理的調(diào)度控制器的資源。
從網(wǎng)絡(luò)結(jié)構(gòu)發(fā)面來(lái)說(shuō)。
一般來(lái)講，DCS慣常使用兩層網(wǎng)絡(luò)結(jié)構(gòu)，一層為過(guò)程級(jí)網(wǎng)絡(luò)，大部分DCS使用自己的總線協(xié)議，比如西門子和ABB的Profibus、ABB的CAN bus、施耐德的Modbus等，這些協(xié)議均建立在標(biāo)準(zhǔn)串口傳輸協(xié)議RS232或RS485協(xié)議的基礎(chǔ)上?，F(xiàn)場(chǎng)IO模塊，特別是模擬量的采樣數(shù)據(jù)（機(jī)器代碼，213/掃描周期）十分龐大，同時(shí)現(xiàn)場(chǎng)干擾因素較多，因此應(yīng)該采用數(shù)據(jù)吞吐量大、抗干擾能力強(qiáng)的網(wǎng)絡(luò)標(biāo)準(zhǔn)?；赗S485串口異步通訊方式的總線結(jié)構(gòu)，符合現(xiàn)場(chǎng)通訊的要求。
IO的采樣數(shù)據(jù)經(jīng)CPU轉(zhuǎn)換后變?yōu)檎螖?shù)據(jù)或?qū)嵭螖?shù)據(jù)，在操作級(jí)網(wǎng)絡(luò)（第二層網(wǎng)絡(luò)）上傳輸。因此操作級(jí)網(wǎng)絡(luò)可以采用數(shù)據(jù)吞吐量適中、傳輸速度快、連接方便的網(wǎng)絡(luò)標(biāo)準(zhǔn)，同時(shí)因操作級(jí)網(wǎng)絡(luò)一般布置在控制室內(nèi)，對(duì)抗干擾的要求相對(duì)較低。因此采用標(biāo)準(zhǔn)以太網(wǎng)是最佳選擇。TCP/IP協(xié)議是一種標(biāo)準(zhǔn)以太網(wǎng)協(xié)議，一般我們采用100Mbit/s的通訊速度。
PLC系統(tǒng)的工作任務(wù)相對(duì)簡(jiǎn)單，因此需要傳輸?shù)臄?shù)據(jù)量一般不會(huì)太大，所以常見(jiàn)的PLC系統(tǒng)為一層網(wǎng)絡(luò)結(jié)構(gòu)。過(guò)程級(jí)網(wǎng)絡(luò)和操作級(jí)網(wǎng)絡(luò)要么合并在一起，要不過(guò)程級(jí)網(wǎng)絡(luò)簡(jiǎn)化成模件之間的內(nèi)部連接。PLC不會(huì)或很少使用以太網(wǎng)。
產(chǎn)品承諾
保?證?全新原裝進(jìn)口,
保?證?安全準(zhǔn)時(shí)發(fā)貨，
保?證售后服務(wù)質(zhì)量，
優(yōu)勢(shì)價(jià)格，大量現(xiàn)貨。
主營(yíng)DCS系統(tǒng)配件
機(jī)器人系統(tǒng)配件
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