1746-NO8V
1746-NO8V可靠的信息和數(shù)據(jù)傳輸服務(wù)不僅僅是取決于傳輸?shù)乃俣扰c準(zhǔn)確率，同時也要考慮到現(xiàn)場的各種因素，所以為了實(shí)現(xiàn)涂裝車間輸送電氣控制系統(tǒng)的可靠性，設(shè)計(jì)人員做了以下幾點(diǎn)：
1、使用工業(yè)以太網(wǎng)中EtherNet/IP作為通信技術(shù)，能同時支持10M和100M，它的一個數(shù)據(jù)包最多可達(dá)到1500字節(jié)，數(shù)據(jù)傳輸速率可達(dá)10Mb/s或100Mb/s，便于實(shí)現(xiàn)大量數(shù)據(jù)的高速傳輸，這能解決因現(xiàn)場設(shè)備多而造成數(shù)據(jù)傳輸大而復(fù)雜的難題。
2、使用光纖通信從而保證遠(yuǎn)距離高速傳輸，使用室內(nèi)用光纖作為通信介質(zhì)保證光纖在橋架中可彎曲，多備用光纖芯數(shù)防止光纖斷裂。
3、使用Allen-Bradley旗下Rockwell Automation一系列通信產(chǎn)品，包括1783-US08T的交換機(jī)、1756-ENBT的通信模塊、帶光電轉(zhuǎn)換功能的1783-ETAP2F光纖交換機(jī)、1734-AENT遠(yuǎn)程I\O通信模塊來組成一個EtherNet/IP通信網(wǎng)絡(luò)，這樣保證系統(tǒng)不會出現(xiàn)硬件兼容性問題，又為通信減少了因不同的硬件數(shù)據(jù)轉(zhuǎn)換所占用的資源和內(nèi)存開銷。使用Rockwell Automation一系列通信產(chǎn)品硬件的同時，我們在軟件中組態(tài)成環(huán)型網(wǎng)絡(luò)，使得所在網(wǎng)絡(luò)節(jié)點(diǎn)都可以有兩條通信路徑，保證在斷了一個節(jié)點(diǎn)的同時還能保持控制不中斷。
4、為了降低急停受到外界的干擾，采用Allen-Bradley旗下Rockwell Automation的Controllogix安全型PLC，利用安全模塊建立急停安全通道，使急停能夠在最少干擾下，最優(yōu)先停止PLC運(yùn)行，盡可能避免事故的發(fā)生。
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