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廈門仲鑫達(dá)自動化設(shè)備有限公司

 16303-2/00
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廈門市思明區(qū)湖濱東路湖光大廈8樓A座
接觸器是一種應(yīng)用廣泛的開關(guān)電器。接觸器主要用于頻繁接通或分?jǐn)嘟弧⒅绷髦麟娐泛痛笕萘康目刂齐娐?，可遠(yuǎn)距離操作，配合繼電器可以實(shí)現(xiàn)定時操作，聯(lián)鎖控制及各種定量控制和失壓及欠壓保護(hù)，廣泛應(yīng)用于自動控制電路，其主要控制對象是電動機(jī)，也可用于控制其它電力負(fù)載，如電熱器、照明、電焊機(jī)、電容器組等。 [全文]
系統(tǒng)相比，電氣接線及開關(guān)接點(diǎn)已減少到數(shù)百甚至數(shù)千分之一，故障也就大大降低。此外，PLC帶有硬件故障自我檢測功能，出現(xiàn)故障時可及時發(fā)出警報(bào)信息。在應(yīng)用軟件中，應(yīng)用者還可以編入外圍器件的故障自診斷程序，使系統(tǒng)中除PLC以外的電路及設(shè)備也獲得故障自診斷保護(hù)。這樣，整個系統(tǒng)的可靠性*。 出刷新階段:在所指令執(zhí)行完成后，輸出映像寄存區(qū)的所有輸出繼電器的狀態(tài)(接通/斷開)在輸出刷新階段轉(zhuǎn)存到輸出鎖存器中，通過特定方式輸出，驅(qū)動外部負(fù)載。 要強(qiáng)調(diào)一個問題，是十分簡單但卻幾乎每個項(xiàng)目都會發(fā)生的，那就是對PLC的接線。這往往是經(jīng)驗(yàn)不足的工程師常常忽略的一個問題。其實(shí)，現(xiàn)場調(diào)試大部分的問題和工作量都是在接線方面。有經(jīng)驗(yàn)的工程師首先應(yīng)當(dāng)檢查現(xiàn)場的接線。通常，如果現(xiàn)場接線是由用戶或者其它的施工人員完成的，則通過看其接線圖和接線的外觀，就可以對接線的質(zhì)量有個大致的判斷。然后要對所有的接線進(jìn)行一次完整而認(rèn)真的檢查。現(xiàn)場由于接線錯誤而導(dǎo)致PLC被燒壞的情況屢次發(fā)生，在進(jìn)行真正的調(diào)試之前，一定要認(rèn)真地檢查。即便接線不是你的工作，檢查接線也是你的義務(wù)和責(zé)任，而且，可以省去你后面大量的時間。436.1607
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