3.5用于信號監控

PLC自檢信號很多，內部器件也很多，多數使用者未充分發揮其作用。

其實，完全可利用它進行PLC自身工作的監控，或對控制對象進行監控。

這里介紹一種用PLC定時器作看門狗，對控制對象工作情況進行監控的思路。

如用PLC控制某運動部件動作，看施加控制后動作進行了沒有，可用看門狗辦法實現監控。具體作法是在施加控制的同時，令看門狗定時器計時。如在規定的時間內動作完成，即定時器未超過警戒值的情況下，已收到動作完成信號，則說明控制對象工作正常，無需報警。

備貨，備貨，降降降，火火火，火火火……
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