Woodhead?DN4-104-2
咨詢熱線---17750626260
現(xiàn)場(chǎng)總線集成在DCS的I/O總線上
這種方式通過接口卡直接將現(xiàn)場(chǎng)總線集成到DCS系統(tǒng)中。與I/O功能塊相關(guān)的測(cè)量值和設(shè)定值可以通過接口卡映射成I/O總線上等價(jià)的值。通過這種映射關(guān)系,DCS就能透明地獲取現(xiàn)場(chǎng)總線智能儀表傳送的信息,其效果和傳統(tǒng)的變送器相同。
這種集成方式的優(yōu)點(diǎn):
l 只需安裝現(xiàn)場(chǎng)總線接口卡 ,無需改變或升級(jí)DCS系統(tǒng)。
l 對(duì)于一些初級(jí)的現(xiàn)場(chǎng)總線設(shè)備,廠家提供的功能塊有限,這種方式保留了DCS的控制功能。
l 采用低成本的PC作為現(xiàn)場(chǎng)總線組態(tài)、診斷的接口單元。
但這種方式也限制了DCS所能獲取的信息,無法利用現(xiàn)場(chǎng)設(shè)備中大量的狀態(tài)信息。
GE ML350 ML 350
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