1786-RPFRL
1786-RPFRL
電力用戶曾使用PLC,用以實時記錄用戶用電情況,以實現不同用電時間、不同計價的收費辦法,鼓勵用戶在用電低谷時多用電,達到合理用電與節約用電的目的。
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,*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。
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