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對(duì)市場(chǎng)而言，西門子系列plc一直在中國(guó)占主導(dǎo)地位，占有率更是遠(yuǎn)遠(yuǎn)超過(guò)了三菱和歐姆龍，雖然羅克韋爾的plc在近幾年市場(chǎng)占有率上升得很快，但是暫時(shí)還是不能撼動(dòng)西門子在國(guó)內(nèi)市場(chǎng)的霸主地位?！?】據(jù)市場(chǎng)反映，西門子plc具有抗干擾能力強(qiáng)，穩(wěn)定性高，通訊能力好，軟件編程方便，組態(tài)軟件連接容易等優(yōu)點(diǎn)，但普遍缺點(diǎn)是價(jià)格比較貴，所以按照全plc的發(fā)展趨勢(shì)來(lái)看，西門子plc的發(fā)展趨勢(shì)應(yīng)該是體積進(jìn)一步減少，成本進(jìn)一步降低來(lái)適應(yīng)工廠空間和市場(chǎng)需求?！?】【13】
對(duì)大多數(shù)控制器來(lái)說(shuō)，系統(tǒng)內(nèi)部有自帶的算法，如常見(jiàn)的PID算法，只要設(shè)置好參數(shù)就能實(shí)現(xiàn)一般的PID控制器功能。這樣大大提高了生產(chǎn)效率和設(shè)備成本。
二．
人機(jī)界面（Human Machine Interaction，簡(jiǎn)稱HMI），又稱用戶界面或使用者界面，是人與計(jì)算機(jī)之間傳遞、交換信息的媒介和對(duì)話接口，是計(jì)算機(jī)系統(tǒng)的重要組成部分。是系統(tǒng)和用戶之間進(jìn)行交互和信息交換的媒介，它實(shí)現(xiàn)信息的內(nèi)部形式與人類可以接受形式之間的轉(zhuǎn)換。凡參與人機(jī)信息交流的領(lǐng)域都存在著人機(jī)界面。【5】
傳統(tǒng)的工廠監(jiān)控用的是人力來(lái)監(jiān)測(cè)系統(tǒng)哪一部分出現(xiàn)問(wèn)題然后著手解決，這樣的話控制系統(tǒng)每一部分都要安排一部分人每天不停監(jiān)控，測(cè)量設(shè)備內(nèi)部是否出現(xiàn)問(wèn)題，這樣大大浪費(fèi)了人力資源和時(shí)間而且必須是系統(tǒng)出了問(wèn)題才能檢測(cè)得到，這樣對(duì)工廠的生產(chǎn)有巨大的影響。
為了解決這樣的問(wèn)題人機(jī)界面軟件應(yīng)運(yùn)而生，人機(jī)界面能通過(guò)變量連接在線檢測(cè)變量的變化趨勢(shì)而描繪出變量變化趨勢(shì)圖，人們只需要在監(jiān)控室里面監(jiān)控系統(tǒng)變量的變化趨勢(shì)是否觸及報(bào)警線而提前對(duì)系統(tǒng)故障進(jìn)行應(yīng)對(duì)。而且人機(jī)界面具有在線監(jiān)控，故障報(bào)警，數(shù)據(jù)歸檔等功能對(duì)過(guò)程變量的數(shù)據(jù)進(jìn)行存儲(chǔ)，對(duì)往后控
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