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西門子PLCS7-300系列PLC安裝及注意事項(xiàng)
西門子$7300安裝注意事項(xiàng)一)輔助電源功率較小,只能帶動(dòng)小功率的設(shè)備(光電傳感器等)
西門子$7-300安裝注意事項(xiàng)二)一般PLC均有一定數(shù)量的占有點(diǎn)數(shù)(即空地址接線端子)不要將線接上
西門子S7300安裝注意事項(xiàng)三)PLC存在O響應(yīng)延遲問題,尤其在快速響應(yīng)設(shè)備中應(yīng)加以注意
西門子S7-300安裝注意事項(xiàng)四)輸出有繼電器型,晶體管型(高速輸出時(shí)宣選用)輸出可直接帶輕負(fù)載(LED指示燈等)
西門子S7-300安裝注意事項(xiàng)五)輸入斷開的時(shí)間要大于PLC掃描時(shí)間
西門子$7300安裝注意事項(xiàng)六PLC輸出電路中沒有保護(hù),因此應(yīng)在外部電路中審聯(lián)使用烙斷器等保護(hù)裝置,防止負(fù)載短踣造成
損壞PLC
西門子S7-300安裝注意事項(xiàng)七不要將交流電源線接到輸入端子上,以免燒壞PLC
西門子S7-300安裝注意事項(xiàng)八接地端子應(yīng)獨(dú)立接地,不與其它設(shè)備接地端串聯(lián),接地線裁面不小于2mm2
西門子S7300安裝注意事項(xiàng)九輸入、輸出信號(hào)線盡量分開走線,不要與動(dòng)力線在同一管路內(nèi)或捆扎在一起,以免出現(xiàn)干擾信
號(hào),產(chǎn)生誤動(dòng)作;信號(hào)傳輸線釆用屏蔽線,并且將屏蔽線接地;為保證信號(hào)可靠,輸入、輸出線一般控制在20米以內(nèi)擴(kuò)展電纜易
受噪聲電干擾,應(yīng)遠(yuǎn)離動(dòng)力線、高壓設(shè)備等
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