JZNC-TB24L

详情描述：

JZNC-TB24L

JZNC-TB24L

JZNC-TB24L

可编程控制器的工作过程包括两部分：自诊断及通信响应的固定过程和用户程序执行过程，如图5-1所示。PLC在每次执行用户程序之前，都先执行故障自诊断程序、复位、监视、定时等内部固定程序，若自诊断正常，继续向下扫描，然后PLC检查是否有与编程器、计算机等的通信请求。如果有与计算机等的通信请求，则进行相应处理。当PLC处于停止（STOP）状态时，只循环进行前两个过程。而在PLC处于运行（RUN）状态时，PLC从内部处理、通信操作、输入扫描、执行用户程序、输出刷新五个工作阶段循环工作。每完成一次以上五个阶段所需要的时间称为一个扫描周期。

   


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