3842453123MDEMaxx071-12
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，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。基本單元內有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；用戶指令解釋程序將PLC的用戶指令轉換為機器語言指令，傳輸?shù)紺PU內執(zhí)行；功能程序與系統(tǒng)程序調用則負責調用不同的功能子程序及其管理程序。
系統(tǒng)程序屬于需長期保存的重要數(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容，不能寫入內容，ROM具有非易失性，即電源斷開后仍能保存已存儲的內容。
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容，可電擦除可編程只讀存儲器還有E2PROM、FLASH等。

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試，所以稱為用戶調試程序，存放在可以隨機讀寫操作的隨機存取存儲器RAM內以方便用戶修改與調試。
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試，所以用戶執(zhí)行程序就被固化到EPROM內長期使用。
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