3HAC022307-094
(3) 控制總線
把完成不同任務(wù)的三種控制器連在一條總線上,實(shí)現(xiàn)控制器之間的通訊,稱為控制總線。在控制總線上的不同控制器的數(shù)量不受限制,在這一條總線上除三種不同的控制器模件以外,還有DCS網(wǎng)絡(luò)的接口模件。在控制總線上,控制器之間可以調(diào)用數(shù)據(jù),使得模擬量和開關(guān)量之間的結(jié)合很好。控制總線不是DCS系統(tǒng)都具有,可以把各種控制器分別連到DCS網(wǎng)絡(luò)上,控制器之間的數(shù)據(jù)調(diào)用通過DCS網(wǎng)絡(luò)??刂瓶偩€的傳輸速率與I/O總線的傳輸速率相類似。通常是幾十K到幾兆之間。當(dāng)CPU和存儲(chǔ)器的能力比較強(qiáng)時(shí),把開關(guān)量的邏輯運(yùn)算和模擬量的采集功能都在一個(gè)控制器中完成,這樣在控制總線上就只有一種形式的控制器。其通訊協(xié)議類似以太網(wǎng),采用載波監(jiān)聽,令牌廣播發(fā)送。
(4) DCS網(wǎng)絡(luò)
它把現(xiàn)場(chǎng)控制器和人機(jī)界面連成一個(gè)系統(tǒng)。為了確保通訊可靠,DCS生產(chǎn)廠家無論是電纜,還是通訊接口,都作成冗余的,一條網(wǎng)絡(luò)發(fā)生故障,另一條備用網(wǎng)絡(luò)立即投入運(yùn)行。連在DCS通訊網(wǎng)絡(luò)上的部件稱為結(jié)點(diǎn)(節(jié)點(diǎn))。在地理位置上,結(jié)點(diǎn)可以分散配置,各結(jié)點(diǎn)的距離各DCS系統(tǒng)不同,有的可達(dá)幾百米。DCS網(wǎng)絡(luò)的傳輸速率在幾百K至一百兆之間,網(wǎng)絡(luò)的總長度可達(dá)幾公里,最短也有幾百米,網(wǎng)絡(luò)不夠長時(shí)需加中繼器。
【公 司】: 福建鴻飛達(dá)自動(dòng)化科技有限公司
【主 營】: AB(羅克韋爾)PLC全系列、ABB機(jī)器人系統(tǒng)備件、施耐德140/TSX、西門子6SN/6FC、伺服系統(tǒng)全套等
【價(jià) 格】: 電議
【發(fā)布人】: 程先生
【電 話】: 15306977024 13625073704
【所在地】: 福建 - 福州
【坐 機(jī)】: 0591-83532940
【Q Q】: 2851617309
【傳 真】: 0591-88263940
【郵 箱】: 2851617309@qq.com
產(chǎn)品價(jià)格以電話或者QQ詢價(jià)為準(zhǔn),發(fā)布價(jià)格不做參考,圖片也一樣
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