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ab 1756-cnb

有極強的自檢及保護功能。

①故障檢測——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。

②信息保護與恢復——當偶發(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。

③設(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。

④加強對程序的檢查和校驗——一旦程序有錯，立即報警，并停止執(zhí)行。

⑤對程序及動態(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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廈門莫格電氣自動化有限公司    

聯(lián)系人：楊麗君（銷售工程師）                                        

手   機：18050036945/0592-6808374

q     q：3443643092                        

郵    箱：3443643092@

傳    真：0596-6514751（請備注楊工收）                      

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