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1756-IB16ISOE@AB*控制器電源@IC697CHS7911756-IB16ISOE@AB*控制器電源@IC697CHS7911756-IB16ISOE@AB*控制器電源@IC697CHS7911756-IB16ISOE@AB*控制器電源@IC697CHS7911756-IB16ISOE@AB*控制器電源@IC697CHS7911756-IB16ISOE@AB*控制器電源@IC697CHS7911756-IB16ISOE@AB*控制器電源@IC697CHS7911756-IB16ISOE@AB*控制器電源@IC697CHS7911756-IB16ISOE@AB*控制器電源@IC697CHS7911756-IB16ISOE@AB*控制器電源@IC697CHS7911756-IB16ISOE@AB*控制器電源@IC697CHS7911756-IB16ISOE@AB*控制器電源@IC697CHS7911756-IB16ISOE@AB*控制器電源@IC697CHS7911756-IB16ISOE@AB*控制器電源@IC697CHS7911756-IB16ISOE@AB*控制器電源@IC697CHS7911756-IB16ISOE@AB*控制器電源@IC697CHS7911756-IB16ISOE@AB*控制器電源@IC697CHS7911756-IB16ISOE@AB*控制器電源@IC697CHS7911756-IB16ISOE@AB*控制器電源@IC697CHS7911756-IB16ISOE@AB*控制器電源@IC697CHS7911756-IB16ISOE@AB*控制器電源@IC697CHS7911756-IB16ISOE@AB*控制器電源@IC697CHS7911756-IB16ISOE@AB*控制器電源@IC697CHS7911756-IB16ISOE@AB*控制器電源@IC697CHS7911756-IB16ISOE@AB*控制器電源@IC697CHS7911756-IB16ISOE@AB*控制器電源@IC697CHS7911756-IB16ISOE@AB*控制器電源@IC697CHS7911756-IB16ISOE@AB*控制器電源@IC697CHS7911756-IB16ISOE@AB*控制器電源@IC697CHS7911756-IB16ISOE@AB*控制器電源@IC697CHS7911756-IB16ISOE@AB*控制器電源@IC697CHS7911756-IB16ISOE@AB*控制器電源@IC697CHS7911756-IB16ISOE@AB*控制器電源@IC697CHS7911756-IB16ISOE@AB*控制器電源@IC697CHS7911756-IB16ISOE@AB*控制器電源@IC697CHS7911756-IB16ISOE@AB*控制器電源@IC697CHS7911756-IB16ISOE@AB*控制器電源@IC697CHS791
PLC內(nèi)的存儲器主要用于存放系統(tǒng)程序、用戶程序和數(shù)據(jù)等。
1)系統(tǒng)程序存儲器
PLC系統(tǒng)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(tǒng)程序存儲器中，主要有系統(tǒng)管理程序、用戶指令解釋程序和功能程序與系統(tǒng)程序調(diào)用等部分。
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。
中央處理器(CPU)由控制器、運算器和寄存器組成并集成在一個芯片內(nèi)。CPU通過數(shù)據(jù)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，如8031、M68000等，這類芯片價格很低；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(nèi)系統(tǒng)程序賦予的功能指揮PLC控制系統(tǒng)完成各項工作任務。
PLC基本組成包括中央處理器(CPU)、存儲器、輸入/輸出接口(縮寫為I/O，包括輸入接口、輸出接口、外部設備接口、擴展接口等)、外部設備編程器及電源模塊組成，見圖1。PLC內(nèi)部各組成單元之間通過電源總線、控制總線、地址總線和數(shù)據(jù)總線連接，外部則根據(jù)實際控制對象配置相應設備與控制裝置構(gòu)成PLC控制系統(tǒng)。
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