西門子6ES7407-0DA00-0AA0 Siemens SIMATIC PLC Power
西門子6ES7407-0DA00-0AA0 Siemens SIMATIC PLC Power
西門子6ES7407-0DA00-0AA0 Siemens SIMATIC PLC Power
PROFINET是用于實(shí)現(xiàn)自動(dòng)化的工業(yè)以太網(wǎng)標(biāo)準(zhǔn),它以標(biāo)準(zhǔn)以太網(wǎng)(IEEE 802.3)為基礎(chǔ),
可連接從現(xiàn)場(chǎng)級(jí)一直到管理層的各種設(shè)備。
可實(shí)現(xiàn)范圍廣泛的開(kāi)放式網(wǎng)絡(luò)解決方案
傳輸性能高,速度高達(dá)10 Gbit/s
將常規(guī)IT功能(如網(wǎng)絡(luò)服務(wù)器和電子郵件)集成到自動(dòng)化系統(tǒng)中
采用SIMATIC NET安全產(chǎn)品(帶有Security Integrated的SIMATIC NET CP、
SCAL ANCE S和SCALANCE M )的工業(yè)安全解決方案,尤其適用于I業(yè)自動(dòng)化
工業(yè)以太網(wǎng)
工業(yè)標(biāo)準(zhǔn)型以太網(wǎng)。
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6ES7407-0DA00-0AA0進(jìn)行隔離是防止電流在兩個(gè)通訊點(diǎn)之間流動(dòng)的一-種方法。-般在兩種情況下采用隔離:第
-種情況是，在有可能存在損壞設(shè)備或危害人員的潛在的電流浪涌時(shí)。第二種情況是必須避免
存在不同地電位和分裂的接地回路的互連。兩種情形都是采用隔離來(lái)避免電流流過(guò)，而允許兩
點(diǎn)之間有數(shù)據(jù)或功率傳送。隔離應(yīng)用涉及高電壓、高速/高精度通信、或者長(zhǎng)距離通信。普通
的例子如工業(yè)IO系統(tǒng)、傳感器接口、電源/調(diào)節(jié)桿，發(fā)動(dòng)機(jī)控制/驅(qū)動(dòng)系統(tǒng)以及儀器儀表。
早期的設(shè)計(jì)除使用變壓器之外，還使用各種模擬隔離放大器，將工廠地面的傳感器電路與
控制室內(nèi)的信號(hào)處理系統(tǒng)進(jìn)行隔離。在通道數(shù)量有限及信號(hào)帶寬小的應(yīng)用中，目前仍在采用這
些放大器。隔離放大器雖然具有高可靠性和高精度，但受限于信號(hào)帶寬50kHz。 其老舊的技
術(shù)要求最小+4V的電源，不支持目前的3V及以下的低電壓應(yīng)用。此外，其制造過(guò)程涉及輸入
和輸出部分單獨(dú)制作，異常電路匹配的激光微調(diào)，以及在兩部分間安裝隔離電容，使這些器件
相當(dāng)昂貴。
