产品简介
SGMGH-75AC61编码器
SGMGH-75AC61编码器
产品价格:¥1
上架日期:2017-11-27 09:54:17
产地:日本
发货地:福州
供应数量:不限
最少起订:1个
浏览量:158
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    SGMGH-75AC61编码器

    SGMGH-75AC61编码器

    SGMGH-75AC61编码器


    PLC运行时,CPU就要执行用户程序中的操作。但是CPU不可能同时执行多个操作,只能分时地一个操作一个操作地执行。PLC利用系统软件在其内部建立了输入输出映像区,当PLCCPU执行用户程序时,从输入映像区中读取输入信号的状态,进行相应的操作。当CPU执行完第一个操作后,将操作结果输出到输出映像区,然后再执行第二个操作,操作结果送到输出映像区。在程序执行过程中,PLC并不读取输入信号的真正状态,执行结果也并没有输出到PLC外部。只有当程序执行到结束指令(END)时,将输出映像区中执行结果向PLC外部输出一次,将输入信号的状态读取一次送到输入映像区。对输入输出信号的这一操作过程称为I/O刷新。I/O刷新完成后,CPU再从用户程序的第一条指令开始,进行下一次程序执行。PLC的这种工作方式被称为扫描方式。

     PLC的扫描周期包括上电后初始处理、共同处理、上位链接服务、外设服务、运算处理、I/O刷新。

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    Mitsubishi Circuit Board BN624A047B #20772

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