中央處理器
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(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,。
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