3-533-0081G
A20B-2901-0480/03C
根據(jù)PLC所具有的功能不同,可將PLC分為低檔、中檔、三類。
3.功能強,適應面廣
2.按功能分類
(1)整體式PLC整體式PLC是將電源、CPU、I/O接口等部件都集中裝在一個機箱內(nèi),具有結構緊湊、體積小、價格低的特點。小型PLC一般采用這種整體式結構。整體式PLC由不同I/O點數(shù)的基本單元(又稱主機)和擴展單元組成?;締卧獌?nèi)有CPU、I/O接口、與I/O擴展單元相連的擴展口,以及與編程器或EPROM寫入器相連的接口等。擴展單元內(nèi)只有I/O和電源等,沒有CPU?;締卧蛿U展單元之間一般用扁平電纜連接。整體式PLC一般還可配備特殊功能單元,如模擬量單元、位置控制單元等,使其功能得以擴展。
系統(tǒng)管理程序主要控制PLC的運行,使PLC按正確的次序工作;用戶指令解釋程序?qū)LC的用戶指令轉(zhuǎn)換為機器語言指令,傳輸?shù)紺PU內(nèi)執(zhí)行;功能程序與系統(tǒng)程序調(diào)用則負責調(diào)用不同的功能子程序及其管理程序。
系統(tǒng)程序?qū)儆谛栝L期保存的重要數(shù)據(jù),所以其存儲器采用ROM或EPROM。ROM是只讀存儲器,該存儲器只能讀出內(nèi)容,不能寫入內(nèi)容,ROM具有非易失性,即電源斷開后仍能保存已存儲的內(nèi)容。
EPEROM為可電擦除只讀存儲器,須用紫外線照射芯片上的透鏡窗口才能擦除已寫入內(nèi)容,可電擦除可編程只讀存儲器還有E2PROM、FLASH等。
![3842453123MDEMaxx071-12](http://www.cqzhejia.com/file/upload/201808/20/16-18-15-89-558220.jpg)
用戶程序存儲器用于存放用戶載入的PLC應用程序,載入初期的用戶程序因需修改與調(diào)試,所以稱為用戶調(diào)試程序,存放在可以隨機讀寫操作的隨機存取存儲器RAM內(nèi)以方便用戶修改與調(diào)試。
按照摩爾定律的穩(wěn)定發(fā)展,使得我們擁有了海量處理能力的機器。企業(yè)能夠處理TB甚至PB級數(shù)據(jù),從而強化決策層管理,不斷發(fā)現(xiàn)新市場,優(yōu)化過程。對于制造商而言,***的挑戰(zhàn)是收集數(shù)據(jù)并根據(jù)數(shù)據(jù)采取措施。為解決這一問題,目前涌現(xiàn)出三大技術趨勢
通過修改與調(diào)試后的程序稱為用戶執(zhí)行程序,由于不需要再作修改與調(diào)試,所以用戶執(zhí)行程序就被固化到EPROM內(nèi)長期使用。
聯(lián)系人:李工銷售工程師
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