2．濕度
為了保證PLC的絕緣功用，空氣的相對(duì)濕度應(yīng)小于85%（無凝露）。
3．轟動(dòng)
應(yīng)使PLC遠(yuǎn)離激烈的轟動(dòng)源，防止振蕩頻率為10~55Hz的頻頻或接連振蕩。當(dāng)運(yùn)用環(huán)境不可防止轟動(dòng)時(shí)，有必要采納減震辦法，如選用減震膠等。
4．空氣
防止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)備在封閉性較好的操控室或操控柜中，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)于電源線來的攪擾，PLC自身具有滿意的抵抗才干。（http://www.diangon.com/）關(guān)于牢靠性請(qǐng)求很高的場(chǎng)合或電源攪擾特別嚴(yán)重的環(huán)境，能夠設(shè)備一臺(tái)帶屏蔽層的變比為1：1的隔絕變壓器，以削減設(shè)備與地之間的攪擾。還能夠在電源輸入端串接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)或挨近開關(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恼鳛V波電源，因?yàn)榧y波的影響，簡(jiǎn)單使PLC接收到過錯(cuò)信息。一、體系請(qǐng)求：
在污水處理廠樹立一個(gè)領(lǐng)先、牢靠、高效且便于進(jìn)一步擴(kuò)大的集進(jìn)程操控、監(jiān)督和計(jì)算機(jī)辦理于一體并且具有杰出敞開性的監(jiān)控體系，完結(jié)對(duì)悉數(shù)污水處理技能進(jìn)程及悉數(shù)出產(chǎn)設(shè)備的監(jiān)測(cè)與主動(dòng)操控。
廈門興銳達(dá)自動(dòng)化設(shè)備有限公司
聯(lián)系人：劉錦玲 銷售經(jīng)理
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