描述
Bently 3500/20 125760-01
???PLC控制系統(tǒng)是由繼電器控制系統(tǒng)和計算機控制系統(tǒng)發(fā)展而來的,與傳統(tǒng)的繼電器控制系統(tǒng)相比,主要不同表現(xiàn)在以下幾個方面。
(1)繼電器控制系統(tǒng)采用許多硬器件、硬觸點和“硬”接線連接,組成邏輯電路實現(xiàn)邏輯控制要求,而且易磨損、壽命短。而PLC控制系統(tǒng)內(nèi)部大多采用“軟”繼電器、? “軟”接點和“軟”接線連接,其控制邏輯由存儲在內(nèi)存中的程序?qū)崿F(xiàn),且無磨損現(xiàn)象,壽命長。
(2)繼電器控制系統(tǒng)體積大、連線多,PLC控制系統(tǒng)結(jié)構(gòu)緊湊、體積小、連線少。
(3)改變繼電器控制系統(tǒng)功能需拆線、接線乃至更換元器件,比較麻煩。而改變PLC控制功能,一般僅修改程序即可,極其方便。
(4)繼電器控制系統(tǒng)中硬繼電器的觸點數(shù)量有限,用于控制用的繼電器觸點數(shù)一般只有4~8對,而PLC每只軟繼電器供編程用的觸點數(shù)有無限對,使PLC控制系統(tǒng)有很好的靈活性和擴(kuò)展性。
(5)在繼電器控制系統(tǒng)中,為了達(dá)到某種控制目的,要求安全可靠,節(jié)約觸點用量,因此,設(shè)置了許多制約關(guān)系的連鎖環(huán)節(jié)。在PLC中,由于采用掃描工作方式,不存在幾個并列支路同時動作的因素,因此,設(shè)計過程大為簡化,可靠性增強。
(6) PLC控制系統(tǒng)具有自檢功能,能查出自身的故障,隨時顯示給操作人員,并能動態(tài)地監(jiān)視控制程序的執(zhí)行情況,為現(xiàn)場調(diào)試和維護(hù)提供了方便。
(7)定時控制,繼電器控制邏輯利用時間繼電器進(jìn)行時間控制。一般來說,時間繼電器存在定時精確度不高、定時范圍窄、易受環(huán)境濕度和溫度變化的影響、時間調(diào)整困難等問題。PLC使用半導(dǎo)體集成電路做定時器,時基脈沖由晶體振蕩器產(chǎn)生,精度相當(dāng)高,且定時時間不受環(huán)境的影響,定時范圍一般從0.001s到若干天或更長,用戶可根據(jù)需要在程序中設(shè)置定時值,然后由軟件來控制定時時間。
從以上幾個方面的比較可知,PLC在性能上優(yōu)于繼電器,控制邏輯優(yōu)異,特別是具有可靠性高,設(shè)計施工周期短,調(diào)試修改方便的特點,而且體積小、功耗低、使用維護(hù)方便。但在很小的系統(tǒng)中使用時,價格要高于繼電器控制系統(tǒng)。
產(chǎn)品承諾:
保?證?全新原裝進(jìn)口,
保?證?安全準(zhǔn)時發(fā)貨,
保?證售后服務(wù)質(zhì)量,
優(yōu)勢價格,大量現(xiàn)貨。
主營DCS系統(tǒng)配件
機器人系統(tǒng)配件
大型伺服系統(tǒng)配件
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專業(yè)銷售進(jìn)口DCS? PLC系統(tǒng)備件模塊
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