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:KEB 07.F4.S1D-34201.2
●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(guò)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。KEB 07.F4.S1D-34201.2
●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(lái)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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KEB 07.F4.S1D-34201.2
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KEB 07.F4.S1D-34201.2
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KEB 07.F4.S1D-34201.2