3.5用于信号监控

PLC自检信号很多，内部器件也很多，多数使用者未充分发挥其作用。

其实，完全可利用它进行PLC自身工作的监控，或对控制对象进行监控。

这里介绍一种用PLC定时器作看门狗，对控制对象工作情况进行监控的思路。

如用PLC控制某运动部件动作，看施加控制后动作进行了没有，可用看门狗办法实现监控。具体作法是在施加控制的同时，令看门狗定时器计时。如在规定的时间内动作完成，即定时器未超过警戒值的情况下，已收到动作完成信号，则说明控制对象工作正常，无需报警。

备货，备货，降降降，火火火，火火火……
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