2．濕度
為了保證PLC的絕緣功用，空氣的

相對濕度應(yīng)小于85%（無凝露）。
3．顫抖
應(yīng)使PLC遠(yuǎn)離劇烈的顫抖源，避免

振動(dòng)頻率為10~55Hz的一再或連續(xù)振動(dòng)

。當(dāng)運(yùn)用環(huán)境不可避免顫抖時(shí)，有必要

采用減震方法，如選用減震膠等。
4．空氣
避免有腐蝕和易燃的氣體，例如氯

化氫、硫化氫等。關(guān)于空氣中有較多粉

塵或腐蝕性氣體的環(huán)境，可將PLC設(shè)備

在關(guān)閉性較好的控制室或控制柜中，并

設(shè)備空氣凈化設(shè)備。
5．電源
PLC供電電源為50Hz、220（1±10%

）V的交流電，關(guān)于電源線來的煩擾，

PLC本身具有滿足的反抗才華。

（http://www.diangon.com/）關(guān)于可

靠性懇求很高的場合或電源煩擾格外嚴(yán)

峻的環(huán)境，可以設(shè)備一臺帶屏蔽層的變

比為1：1的阻隔變壓器，以減少設(shè)備與

地之間的煩擾。還可以在電源輸入端串

接LC濾波電路。
三菱PLC有直流24V輸出接線端，該

接線端可為輸入傳感器（如光電開關(guān)或

靠近開關(guān)）供給直流24V電源。當(dāng)輸入

端運(yùn)用外接直流電源時(shí)，應(yīng)選用直流穩(wěn)

壓電源。因?yàn)橥ǔ５恼�流濾波電源，因

為紋波的影響，簡略使PLC接納到過失

信息。一、系統(tǒng)懇求：
在污水處理廠建立一個(gè)領(lǐng)先、可靠、高

效且便于進(jìn)一步拓展的集進(jìn)程控制、監(jiān)

督和計(jì)算機(jī)處理于一體而且具有出色翻

開性的監(jiān)控系統(tǒng)，結(jié)束對悉數(shù)污水處理

技術(shù)進(jìn)程及悉數(shù)出產(chǎn)設(shè)備的監(jiān)測與主動(dòng)

控制。 

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