25B-E9P9N104現(xiàn)貨
專業(yè)銷售:羅克韋爾A-B系列產(chǎn)品
PLC模塊、人機(jī)界面(觸摸屏)、變頻器、軟啟動器、低壓斷路器、負(fù)荷開關(guān)、保護(hù)器、接觸器、繼電器、按鈕、指示燈:
MicroLogix 1000 PLC1761系列模塊
MicroLogix 1100 PLC1763系列模塊
MicroLogix 1200 PLC1762系列模塊
MicroLogix 1400 PLC1766系列模塊
MicroLogix 1500 PLC1764系列模塊
COMPACTLOGIX PLC 1769系列模塊
CONTROLLOGIX PLC 1756系列模塊
FLEXLOGIX PLC1794系列模塊
SLC 500 PLC1746系列模塊
PLC-5 1771系列模塊
PICO控制器1760系列模塊
SOFTLOGIX5800控制器1789系列模塊
POINT IO模塊1734系列模塊
ARMORPOINT IO模塊1738系列模塊
FLEX EX本安型IO模塊1797系列模塊
DATASITE遠(yuǎn)程終端單元1758系列模塊
Micro800產(chǎn)品:
. 2080 Micro810控制器
. 2080 Micro830控制器
. 2080 Micro800插件模塊
PanelView Plus操作員界面2711P系列
PanelView Plus 6操作員界面2711P系列
PanelView Component操作員界面2711C系列
PanelView Plus Compact操作員界面2711PC系列
PanelView操作員界面2711系列
2、從系統(tǒng)結(jié)構(gòu)來說:
PLC與DCS的基本結(jié)構(gòu)是一樣的。PLC發(fā)展到今天,已經(jīng)全面移植到計(jì)算機(jī)系統(tǒng)控制上了,傳統(tǒng)的編程器早就被淘汰。小型應(yīng)用的PLC一般使用觸摸屏,大規(guī)模應(yīng)用的PLC全面使用計(jì)算機(jī)系統(tǒng)。和DCS一樣,控制器與IO站使用現(xiàn)場總線(一般都是基于RS485或RS232異步串口通訊協(xié)議的總線方式),控制器與計(jì)算機(jī)之間如果沒有擴(kuò)展的要求,也就是說只使用一臺計(jì)算機(jī)的情況下,也會使用這個(gè)總線通訊。但如果有不止一臺的計(jì)算機(jī)使用,系統(tǒng)結(jié)構(gòu)就會和DCS一樣,上位機(jī)平臺使用以太網(wǎng)結(jié)構(gòu)。這是PLC大型化后和DCS概念模糊的原因之一。
3、PLC和DCS的發(fā)展方向:
小型化的PLC將向更專業(yè)化的使用角度發(fā)展,比如功能更加有針對性、對應(yīng)用的環(huán)境更有針對性等等。大型的PLC與DCS的界線逐步淡化,直至完全融和。
DCS將向FCS的方向繼續(xù)發(fā)展。FCS的核心除了控制系統(tǒng)更加分散化以外,特別重要的是儀表。FCS在國外的應(yīng)用已經(jīng)發(fā)展到儀表級。控制系統(tǒng)需要處理的只是信號采集和提供人機(jī)界面以及邏輯控制,整個(gè)模擬量的控制分散到現(xiàn)場儀表,儀表與控制系統(tǒng)之間無需傳統(tǒng)電纜連接,使用現(xiàn)場總線連接整個(gè)儀表系統(tǒng)。(目前國內(nèi)有橫河在中海殼牌石化項(xiàng)目中用到了FCS,儀表級采用的是智能化儀表例如:EJX等,具備先進(jìn)的控制水準(zhǔn))。
○如何正確對待PLC和DCS
我個(gè)人從不強(qiáng)調(diào)PLC和DCS之間孰優(yōu)孰劣,我把它們使用了一個(gè)新名詞“控制類產(chǎn)品”。我們提供給用戶的是適合用戶的控制系統(tǒng)。絕大多數(shù)用戶不會因?yàn)橄胧褂靡惶譊CS而去使用DCS,控制類產(chǎn)品必須定位在滿足用戶的工藝要求的基礎(chǔ)之上。其實(shí)提出使用DCS還是PLC的用戶大抵是從沒接觸過自控產(chǎn)品或有某種特殊需求的。過分強(qiáng)調(diào)這個(gè)東東只會陷入口舌之爭。
從PLC與DCS之間的區(qū)別和共同之處我們了解了控制類產(chǎn)品的大抵情況。注意,作為專業(yè)人士,我們自己不要為產(chǎn)品下PLC還是DCS的定義,自己的心理上更不能把產(chǎn)品這樣來區(qū)別對待。
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