AB 1746-NIO4V
·硬件措施:
主要模塊均采用大規(guī)模或超大規(guī)模集成電路,大量開關(guān)動(dòng)作由無觸點(diǎn)的電子存儲(chǔ)器完成,I/O系統(tǒng)設(shè)計(jì)有完善的通道保護(hù)和信號調(diào)理電路。
① 屏蔽——對電源變壓器、CPU、編程器等主要部件,采用導(dǎo)電、導(dǎo)磁良好的材料進(jìn)行屏蔽,以防外界干擾。
② 濾波——對供電系統(tǒng)及輸入線路采用多種形式的濾波,如LC或π型濾波網(wǎng)絡(luò),以消除或抑制高頻干擾,也削弱了各種模塊之間的相互影響。
③ 電源調(diào)整與保護(hù)——對微處理器這個(gè)核心部件所需的+5V電源,采用多級濾波,并用集成電壓調(diào)整器進(jìn)行調(diào)整,以適應(yīng)交流電網(wǎng)的波動(dòng)和過電壓、欠電壓的影響。
④ 隔離——在微處理器與I/O電路之間,采用光電隔離措施,有效地隔離I/O接口與CPU之間電的,減少故障和誤動(dòng)作;各I/O口之間亦彼此隔離。
⑤ 采用模塊式結(jié)構(gòu)——這種結(jié)構(gòu)有助于在故障情況下短時(shí)修復(fù)。一旦查出某一模塊出現(xiàn)故障,能迅速更換,使系統(tǒng)恢復(fù)正常工作;同時(shí)也有助于加快查找故障原因。
廈門莫格電氣自動(dòng)化有限公司
:張 美 霞
**
歡迎您的來電
電 話:
傳 真:
地 址: 廈門市思明區(qū)檳榔西里197號第四層B19單元
http://www.mogget。。cn/
·軟件措施:
有*的自檢及保護(hù)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(qiáng)干擾信號等。以便及時(shí)進(jìn)行處理。
②信息保護(hù)與恢復(fù)——當(dāng)偶發(fā)性故障條件出現(xiàn)時(shí),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(shí),立即把現(xiàn)狀態(tài)存入存儲(chǔ)器,軟件配合對存儲(chǔ)器進(jìn)行封閉,禁止對存儲(chǔ)器的任何操作,以防存儲(chǔ)信息被沖掉。
③設(shè)置警戒時(shí)鐘WDT(看門狗)——如果程序每循環(huán)執(zhí)行時(shí)間超過了WDT規(guī)定的時(shí)間,預(yù)示了程序進(jìn)入死循環(huán),立即報(bào)警。
④加強(qiáng)對程序的檢查和校驗(yàn)——一旦程序有錯(cuò),立即報(bào)警,并停止執(zhí)行。
⑤對程序及動(dòng)態(tài)數(shù)據(jù)進(jìn)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(huì)丟失。
PLC的出廠試驗(yàn)項(xiàng)目中,有一項(xiàng)就是抗干擾試驗(yàn)。它要求能承受幅值為1000V,上升時(shí)間1nS,脈沖寬度為1μS的干擾脈沖。一般,平均故障間隔時(shí)間可達(dá)幾十萬~上千萬小時(shí);制成系統(tǒng)亦可達(dá)4~5萬小時(shí)甚至更長時(shí)間。
廈門莫格電氣自動(dòng)化有限公司
:張 美 霞
**
歡迎您的來電
電 話:
傳 真:
地 址: 廈門市思明區(qū)檳榔西里197號第四層B19單元
http://www.mogget。。cn/
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