8、I/O單元和CPU單元是如何連接的?

　　I/O單元與CPU是通過現(xiàn)場(chǎng)總線連接的。

　　9、 什么是現(xiàn)場(chǎng)總線?

　　現(xiàn)場(chǎng)總線是應(yīng)用于控制現(xiàn)場(chǎng)的一種數(shù)字網(wǎng)絡(luò)，它不僅包含有控制信息交換，而且還包含設(shè)備信息的交流。通過現(xiàn)場(chǎng)總線，各種智能設(shè)備(智能變送器、調(diào)節(jié)法、分析儀和分布式I/O單元)可以方便地進(jìn)行數(shù)據(jù)交換，控制策略可以完全在現(xiàn)場(chǎng)設(shè)備層次上實(shí)現(xiàn)。目前，使用較多的現(xiàn)場(chǎng)總線主要是FUNDATION fieldbus會(huì)現(xiàn)場(chǎng)總線(FF總線)和PROFIBUS現(xiàn)場(chǎng)總線。應(yīng)用現(xiàn)場(chǎng)總線技術(shù)可以將各種分布在控制現(xiàn)場(chǎng)的相關(guān)智能設(shè)備和I/O單元方便的連接在一起，構(gòu)成控制，這種結(jié)構(gòu)已經(jīng)成為DCS發(fā)展的趨勢(shì)。

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