FANUC A06B-0225-B500#0100總線的特點(diǎn)

具體來講，CAN具有如下特點(diǎn)

①結(jié)構(gòu)簡單，只需兩根信號(hào)線，介質(zhì)可以采用雙絞線、同軸電纜或光導(dǎo)纖維。

②通信方式靈活，以多主方式工作，網(wǎng)絡(luò)上的任意一個(gè)節(jié)點(diǎn)均可以在任意時(shí)刻主動(dòng)地向網(wǎng)絡(luò)上的其他節(jié)點(diǎn)發(fā)送信息。

③網(wǎng)絡(luò)上的節(jié)點(diǎn)信息可以分成不同的優(yōu)先級，從而滿足不同的實(shí)時(shí)性要求。

④采用短幀格式通信，每幀多8個(gè)字節(jié)數(shù)據(jù)，不會(huì)占用總線很長時(shí)間，從而保證了通信的實(shí)時(shí)性，同時(shí)也可以滿足通常的工業(yè)控制領(lǐng)域中的數(shù)據(jù)通訊要求。

⑤采用無破壞性的基于優(yōu)先權(quán)的總線仲裁技術(shù)，當(dāng)兩個(gè)節(jié)點(diǎn)同時(shí)向總線上發(fā)送數(shù)據(jù)時(shí)，優(yōu)先級低的節(jié)點(diǎn)主動(dòng)停止數(shù)據(jù)發(fā)送，而優(yōu)先級高的節(jié)點(diǎn)可以不受影響地繼續(xù)發(fā)送數(shù)據(jù)。 

⑥通信距離可達(dá)10 km（速率5 kb/s以下） ，通訊速率可達(dá)1 Mb/s（距離40m以下） 。

⑦采用CRC校驗(yàn)，并且提供了相應(yīng)的錯(cuò)誤處理機(jī)制，從而保證了數(shù)據(jù)通信的可靠性。

FANUC A06B-0225-B500#0100 

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