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plc控制系統(tǒng)可以由整體式PLC或模塊式PLC組成兩種。整體式PLC的I/O和CPU同一塊印刷電路板上，構(gòu)造緊湊、體積小、價(jià)格低廉，小型PLC控制系統(tǒng)大多選用整體式PLC。模塊式PLC控制系統(tǒng)能輕松擴(kuò)展功用、便利增減I/O點(diǎn)數(shù)，修理替換便利、判別與處理毛病敏捷。因而功用要求需求較高的控制系統(tǒng)一般選用模塊式PLC,這是目前運(yùn)用最廣泛的PLC控制系統(tǒng)。
PLC控制系統(tǒng)用戶存貯器
一般PLC控制系統(tǒng)都用CMOS RAM作用戶存貯器，它具有靜態(tài)消耗電流小(1/A)的特征。為了在停電時(shí)保護(hù)用戶程序和現(xiàn)場(chǎng)數(shù)據(jù)，PLC一般用鋰電池作后備電源。
若被控系統(tǒng)的工藝需求固定不變、PLC所編程序已完善且不需批改，為了防止技術(shù)保密或人為改動(dòng)PLC程序，可選用EPROM(選購(gòu)件)將用戶程序固化。
PLC控制系統(tǒng)通訊聯(lián)網(wǎng)功用
大部分小型PLC自動(dòng)控制系統(tǒng)為單機(jī)自動(dòng)化，滿足功用需求即可，可以不選用上位計(jì)算機(jī)通訊接口。
若用戶需求將PLC自動(dòng)控制系統(tǒng)歸入工廠自動(dòng)化控制網(wǎng)絡(luò)，應(yīng)選用帶有通訊接口的PLC自動(dòng)控制系統(tǒng)。一般大型PLC自動(dòng)控制系統(tǒng)和中型PLC自動(dòng)控制系統(tǒng)都具有通訊功用。
目前一些高性能的小型機(jī)也帶有通訊接口，PLC控制系統(tǒng)通過(guò)RS-232串行接口，與上位計(jì)算機(jī)或另一臺(tái)PLC自動(dòng)控制系統(tǒng)相連，還可以連接打印機(jī)等外部設(shè)備。
以上介紹了PLC控制系統(tǒng)PLC結(jié)構(gòu)、PLC存貯器和PLC通訊接口幾個(gè)常識(shí)，實(shí)踐運(yùn)用PLC時(shí)應(yīng)根據(jù)用戶需求，概括考慮各種因素，選擇性能價(jià)格比適合的產(chǎn)品，使被控方針的控制需求得到完全滿足，也使PLC自動(dòng)控制系統(tǒng)的功用得到充分發(fā)揮。
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