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(wù)。
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