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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內的存儲器主要用于存放系統程序、用戶程序和數據等。
1)系統程序存儲器
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。
系統程序屬于需長期保存的重要數據，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。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，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內部各組成單元之間通過電源總線、控制總線、地址總線和數據總線連接，外部則根據實際控制對象配置相應設備與控制裝置構成PLC控制系統。
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