描述
5SHY3545L0009 3BHE009681R0101
減少信息往返是網(wǎng)絡(luò)設(shè)計(jì)和系統(tǒng)組態(tài)的一條重要原則。減少信息往返常??蓭砀纳葡到y(tǒng)響應(yīng)時(shí)間的好處。因此,網(wǎng)絡(luò)設(shè)計(jì)時(shí)應(yīng)優(yōu)先將相互間信息交換量大的節(jié)點(diǎn),放在同一條支路里。
減少信息往返與減少系統(tǒng)的線纜有時(shí)會相互矛盾。這時(shí)仍應(yīng)以節(jié)省投資為原則來做選擇。如果所選擇系統(tǒng)的響應(yīng)時(shí)間允許的話,應(yīng)選節(jié)省線纜的方案。如所選系統(tǒng)的響應(yīng)時(shí)間比較緊張,稍微減少一點(diǎn)信息的傳輸就夠用了,那就應(yīng)選減少信息傳輸?shù)姆桨浮?br />
現(xiàn)在一些帶現(xiàn)場總線的現(xiàn)場儀表本身裝了許多功能塊,雖然不同產(chǎn)品同種功能塊在性能上會稍有差別,但一個(gè)網(wǎng)絡(luò)支路上有許多功能雷同功能塊的情況是客觀存在的。選用哪一個(gè)現(xiàn)場儀表上的功能塊,是系統(tǒng)組態(tài)要解決的問題。
典型系統(tǒng)比較
通過使用現(xiàn)場總線,用戶可以大量減少現(xiàn)場接線,用單個(gè)現(xiàn)場儀表可實(shí)現(xiàn)多變量通信,不同制造廠生產(chǎn)的裝置間可以完全互操作,增加現(xiàn)場一級的控制功能,系統(tǒng)集成大大簡化,并且維護(hù)十分簡便。
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