490NOR00003控制系統(tǒng)可靠性降低的主要原因
    雖然工業(yè)控制機和可編程控制器本身都具有很高的可靠性，但如果輸入給PLC的開關(guān)量信號出現(xiàn)錯誤，模擬量信號出現(xiàn)較大偏差，PLC輸出口控制的執(zhí)行機構(gòu)沒有按要求動作，這些都可能使控制過程出錯，造成無法挽回的經(jīng)濟損失。影響現(xiàn)場輸入給PLC信號出錯的主要原因有：
1、造成傳輸信號線短路或斷路（由于機械拉扯，線路自身老化，連接處松脫等），當(dāng)傳輸信號線出故障時，現(xiàn)場信號無法傳送給PLC，造成控制出錯。
2、機械觸點抖動，現(xiàn)場觸點雖然只閉合一次，PLC卻認為閉合了多次，雖然硬件加了濾波電路，軟件增加微分指令，但由于PLC掃描周期太短，仍可能在計數(shù)、累加、移位等指令中出錯，出現(xiàn)錯誤控制結(jié)果。
3、現(xiàn)場變送器，機械開關(guān)自身出故障，如觸點接觸不良，變送器反映現(xiàn)場非電量偏差較大或不能正常工作等，這些故障同樣會使控制系統(tǒng)不能正常工作。影響執(zhí)行機構(gòu)出錯的主要原因有：
1、控制負載的接觸不能可靠動作，雖然PLC發(fā)出了動作指令，但執(zhí)行機構(gòu)并沒按要求動作。
2、控制變頻器起動，由于變頻器自身故障，變頻器所帶電機并沒按要求工作。

3、各種電動閥、電磁閥該開的沒能打開，該關(guān)的沒能關(guān)到位，由于執(zhí)行機構(gòu)沒能按PLC的控制要求動作，使系統(tǒng)無法正常工作，降低了系統(tǒng)可靠性。要提高整個控制系統(tǒng)的可靠性，必須提高輸入信號的可靠性和執(zhí)行機構(gòu)動作的準確性，否則PLC應(yīng)能及時發(fā)現(xiàn)問題，用聲光等報警辦法提示給操作人員，盡除故障，讓系統(tǒng)安全、可靠、正確地工作。

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慧星公司是一家性的貿(mào)易型企業(yè)，主要供應(yīng):A-B 1756 PLC \1747 PLC\1746 PLC \1771老PLC\1769小型PLC\1785\2711觸摸屏 等系列。

西門子：高壓斷路器，過載繼電器，熱繼電器，S7-200,S7-300,S7-500,6DD,6AV,6GK等系列

施耐德：PLC,昆騰140 PLC系列

GE: Genius I/OSeries 90-30Field ControlRx3i PacSystemRx7i PacSystemSeries OneSeries ThreeVersamaxSeries Six

很多常用型號都有庫存現(xiàn)貨，個別沒有現(xiàn)貨的可以訂貨，價格實惠，貨期短，提供售后質(zhì)保。

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