YT212001-AN输入模块
YT212001-AN输入模块
YT212001-AN输入模块
CPU是可编程控制器的控制中枢,相当于人的大脑。CPU一般由控制电路、运算器和寄存器组成。这些电路通常都被封装在一个集成的芯片上。CPU通过地址总线、数据总线、控制总线与存储单元、输入输出接口电路连接。CPU的功能有:它在系统监控程序的控制下工作,通过扫描方式,将外部输入信号的状态写入输入映象寄存区域,PLC进入运行状态后,从存储器逐条读取用户指令,按指令规定的任务进行数据的传送、逻辑运算、算术运算等,然后将结果送到输出映像寄存区域。 CPU常用的微处理器有通用型微处理器、单片机和位片式计算机等。通用型微处理器常见的如Intel公司的8086、80186、到Pentium系列芯片,单片机型的微处理器如Intel公司的MCS-96系列单片机,位片式微处理器如AMD 2900系列的微处理器。小型PLC 的CPU多采用单片机或专用CPU,中型PLC的CPU大多采用16位微处理器或单片机,大型PLC的CPU多用高速位片式处理器,具有高速处理能力。
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