MVI69-DNP
MVI69-DNP
中央處理單元(CPU)一般由控制器、運算器和寄存器組成,這些電路都集成在一個芯片上。
CPU的主要功能:
◆從存儲器中讀取指令
◆執(zhí)行指令
◆順序取指令
◆處理中斷
存儲器
·只讀存儲器ROM:存放監(jiān)控程序和用戶已調(diào)試好的程序 ·隨機存儲器RAM:存儲各種暫存數(shù)據(jù)、中間結(jié)果、用戶正調(diào)試的程序 輸入輸出(I/O)單元 采用光電隔離,實現(xiàn)了PLC的內(nèi)部電路與外部電路的電氣隔離,減小了電磁干擾令
1)輸入接口電路:將按鈕、行程開關(guān)或傳感器等產(chǎn)生的信號,轉(zhuǎn)換成數(shù)字信號送入主機。
2)輸出接口電路:將主機向外輸出的信號轉(zhuǎn)換成可以驅(qū)動外部執(zhí)行電路的信號,以便控制接觸器線圈等電器通斷電;另外輸出電路也使計算機與外部強電隔離
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