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艾默生EPROPR6426/000-121 CON031
艾默生EPROPR6426/000-121 CON031
運算器和寄存器組成并集成在一個芯片內。CPU通過數據總線總線、地址總線、控制總線和電源總線與存儲器、輸入輸出接口、編程器和電源相連接。小型PLC的CPU采用8位或16位微處理器或單片機.中型PLC的CPU采用16位或32位微處理器或單片機,如8086、96系列單片機等,這類芯片主要特點是集成度高、運算速度快且可靠性高;而大型PLC則需采用高速位片式微處理器。CPU按照PLC內系統程序賦予的功能指揮PLC控制系統完成各項工作任務。PLC系統程序決定了PLC的基本功能,該部分程序由PLC制造廠家編寫并固化在系統程序存儲器中,主要有系統管理程序、用戶指令解釋程序和功能程序與系統程序調用等部分.系統管理程序主要控制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,傳輸到CPU內執行;功能程序與系統程序調用則負責調用不同的功能子程序及其管理程序。系統程序屬于需*保存的重要數據,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
IXYS MCC 55-16io1
CAE 35181 Fluid-hydrau Pressure Transd MA136159-01
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M102 431 Motherboard A01 M102431
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KOGANEI PR100
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7SD6105-2bb29-0cj0/bb
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moving arm for Semilab RT Lifetime scanner wt-85XA
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acrosser technology AR-B1374
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philips Backplane C&V AM2 Part