大量的工程實踐表明,PLC外部輸入、輸出設備的故障率遠遠高于PLC本身的故障率,而這些設備出現故障后,PLC一般不能覺察出來,可能使故障擴大,直至強電保護裝置動作后才停機,有時甚至會造成設備和人身事故。停機后,查找故障也要花費很多時間。為了及時發現故障,在沒有釀成事故之前使PLC自動停機和報警,也為了方便查找故障,提高維修效率,可用PLC程序實現故障的自診斷和自處理。
現代的PLC擁有大量的軟件資源,如FX2N系列PLC有幾千點輔助繼電器、幾百點定時器和計數器,有相當大的裕量,可以把這些資源利用起來,用于故障檢測。
聯系人:黃曉飛(銷售工程師) 
移動電話:18030263579 
固話:0592-6895320 
QQ:2472574325
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