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 1、從PLC的外圍設(shè)備來考慮提高PLC的可靠性

    PLC是專門為工業(yè)生產(chǎn)環(huán)境而設(shè)計(jì)的控制設(shè)備。當(dāng)工作環(huán)境較為惡劣，如電磁干擾較強(qiáng)、濕度高、電源、輸入和輸出電路等易受到干擾時(shí)，會(huì)使控制系統(tǒng)的可靠性受到影響。

    1.1 工作環(huán)境的要求

    除了為特殊工作環(huán)境而設(shè)計(jì)的PLC外，一般PLC工作的環(huán)境溫度應(yīng)在0~55℃的范圍，并要避免太陽(yáng)光直接照射；安裝時(shí)要遠(yuǎn)離大的熱源，保證足夠大的散熱空間和通風(fēng)條件；空氣的相對(duì)濕度應(yīng)小于85%，不結(jié)露，以保證PLC的絕緣良好。PLC應(yīng)避免安裝在有振動(dòng)的場(chǎng)所；對(duì)振動(dòng)源允許的條件則應(yīng)按照產(chǎn)品說明書的要求，安裝減振橡膠墊或采取其他防振措施?？諝庵杏蟹蹓m和有害氣體時(shí)，應(yīng)將PLC封閉安裝。

    1.2 電源的要求

    不同的PLC產(chǎn)品，對(duì)電源的要求也不同，這里包括電源的電壓等級(jí)、頻率、交流紋波系數(shù)和輸入輸出的供電方式等。

    對(duì)電磁干擾較強(qiáng)、而對(duì)PLC可靠性要求又較高的場(chǎng)合，PLC的供電應(yīng)與動(dòng)力供電和控制電路供電分開；必要時(shí)，可采用帶屏蔽的隔離變壓器供電、串聯(lián)LC濾波電路等。在設(shè)計(jì)時(shí)，外接的直流電源應(yīng)采用穩(wěn)壓電源，供電功率應(yīng)留有20%~30%的余量。對(duì)由控制器本身提供的直流電源，應(yīng)了解它所能提供的大電流，防止過電流造成設(shè)備的損壞。

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