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6SC6506-4AA02-Z
產(chǎn)品精品 價(jià)格百年一遇
S7-200的端口是不隔離的，如果想使網(wǎng)絡(luò)隔離，應(yīng)考慮使用RS-485中繼器或者EM277。
注意：
●具有不同電位的互聯(lián)設(shè)備有可能導(dǎo)致不希望的電流流過連接電纜。
●這種不希望的電流可能導(dǎo)致通訊失敗或者設(shè)備損壞。
●要確保用通訊電纜連接的所有設(shè)備有相同的參考電位，或者彼此隔離，來避免產(chǎn)生這種不希望的電流。
為網(wǎng)絡(luò)確定通訊距離、通訊速率和電纜類型
網(wǎng)段的*大長(zhǎng)度取決于兩個(gè)因素：隔離（用RS-485中繼器）和波特率。但連接具有不同電位的設(shè)備是需要隔離。當(dāng)接地點(diǎn)之間的距離很遠(yuǎn)時(shí)，有可能具有不同的地電位。即使距離較近，大型機(jī)械的負(fù)載電流也能導(dǎo)致地電位的不同
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CANDIGRA SANITARY HANDLE 3 IN STAINLESS BODY TRI-CLAMP
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