A06B-6240-H106
交換式結(jié)構(gòu): 在交換式以太網(wǎng)中,交換機(jī)根據(jù)收到的數(shù)據(jù)幀中的MAC地址決定數(shù)據(jù)幀 應(yīng)發(fā)向交換機(jī)的哪個(gè)端口。因?yàn)槎丝陂g的幀傳輸彼此屏蔽,因此節(jié)點(diǎn)就 不擔(dān)心自己發(fā)送的幀在通過(guò)交換機(jī)時(shí)是否會(huì)與其他節(jié)點(diǎn)發(fā)送的幀產(chǎn)生沖 突。 為什么要用交換式網(wǎng)絡(luò)替代共享式網(wǎng)絡(luò): ·減少?zèng)_突:交換機(jī)將沖突隔絕在每一個(gè)端口(每個(gè)端口都是一個(gè)沖突 域),避免了沖突的擴(kuò)散。 ·提升帶寬:接入交換機(jī)的每個(gè)節(jié)點(diǎn)都可以使用全部的帶寬,而不是各 個(gè)節(jié)點(diǎn)共享帶寬。
A06B-6240-H106
聯(lián)系人:郭先生
聯(lián)系電話:18971415643
座機(jī):027-83238871
傳真:207-61537051
QQ:810334512
上位機(jī)用于監(jiān)控整個(gè)系統(tǒng)的運(yùn)行, 根據(jù)試驗(yàn)要求向兩臺(tái)伺服驅(qū)動(dòng)器發(fā)出控制指令,同時(shí)接收它們的運(yùn)行數(shù) 據(jù),并對(duì)數(shù)據(jù)進(jìn)行保存、分析與顯示。[2] 對(duì)于這種測(cè)試系統(tǒng),采用高性能的矢量控制方式對(duì)被測(cè)電動(dòng)機(jī)和負(fù)載設(shè) 備分別進(jìn)行速度和轉(zhuǎn)矩控制,即可模擬各種負(fù)載情況下伺服驅(qū)動(dòng)器的動(dòng) 、靜態(tài)性能,完成對(duì)伺服驅(qū)動(dòng)器的全面而準(zhǔn)確的測(cè)試。但由于使用了兩 套伺服驅(qū)動(dòng)器—電動(dòng)機(jī)系統(tǒng),所以這種測(cè)試系統(tǒng)體積龐大,不能滿足便 攜式的要求,而且系統(tǒng)的測(cè)量和控制電路也比較復(fù)雜、成本也很高。[ 2] A06B-6240-H106
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