型號產(chǎn)品:1756-m02ae
++1904676482qq詢價
訂單18030132586報價
軟件措施:
有極強的自檢及保護功能。
、俟收蠙z測——軟件定期地檢測外界環(huán)境,如掉電、欠電壓、鋰電池電壓過低及強干擾信號等。以便及時進行處理。
、谛畔⒈Wo與恢復(fù)——當(dāng)偶發(fā)性故障條件出現(xiàn)時,不破壞plc內(nèi)部的信息。一旦故障條件消失,就可恢復(fù)正常,繼續(xù)原來的程序工作。所以,plc在檢測到故障條件時,立即把現(xiàn)狀態(tài)存入存儲器,軟件配合對存儲器進行封閉,禁止對存儲器的任何操作,以防存儲信息被沖掉。
、墼O(shè)置警戒時鐘wdt(看門狗)——如果程序每循環(huán)執(zhí)行時間超過了wdt規(guī)定的時間,預(yù)示了程序進入死循環(huán),立即報警。
、芗訌妼Τ绦虻臋z查和校驗——一旦程序有錯,立即報警,并停止執(zhí)行。
、輰Τ绦蚣皠討B(tài)數(shù)據(jù)進行電池后備——停電后,利用后備電池供電,有關(guān)狀態(tài)及信息就不會丟失。
plc的出廠試驗項目中,有一項就是抗干擾試驗。它要求能承受幅值為1000v,上升時間1ns,脈沖寬度為1μs的干擾脈沖。一般,平均故障間隔時間可達幾十萬~上千萬小時;制成系統(tǒng)亦可達4~5萬小時甚至更長時間。
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