FOXBORO 2AX-ALM-AR連在DCS通訊網(wǎng)絡(luò)上的部件稱為結(jié)點。在地理位置上，結(jié)點可以分散配置，各結(jié)點之間的距離各DCS系統(tǒng)不同。有的可達幾百米。傳輸速率在幾百K至一百兆之間。10兆是常用的速率。DCS網(wǎng)絡(luò)的總長度可達幾公里，最短也有幾百米，網(wǎng)絡(luò)不夠長時要加中繼器。
三種總線的通訊協(xié)議是由各DCS生產(chǎn)廠家自行開發(fā)的，通訊協(xié)議是不公開的。
DCS網(wǎng)絡(luò)的結(jié)構(gòu)形式大致是三種，分別是總線形、環(huán)形和星形。星形結(jié)構(gòu)通常只用于小系統(tǒng)。通訊協(xié)議有令牌廣播式，問詢式和存儲轉(zhuǎn)發(fā)式。問詢式協(xié)議的網(wǎng)絡(luò)要有交通指揮器。FOXBORO 2AX-ALM-AR所有人機界面要向控制器請求數(shù)據(jù)時，必需通過交通指揮器，由交通指揮器來向控制器請求數(shù)據(jù)。控制器才能發(fā)送信息給人機界面。如HONEYWELL的TDC2000，F(xiàn)ISHER的PROVOX，都有交通指揮器。在星形網(wǎng)絡(luò)中，人機界面（操作站）可以作為交通指揮器。它只能連接一個人機界面的結(jié)點。把它作為操作站。網(wǎng)絡(luò)的覆蓋面也比較小。由一些回路控制器組成的系統(tǒng)通常都連成星形網(wǎng)絡(luò)。令牌廣播式由一個結(jié)點發(fā)出一個令牌(令牌是特別的比特組，比特組內(nèi)無源地址和目的地址)，令牌沿環(huán)繞行。拿到這個令牌的結(jié)點就改變令牌中一個特定位，將令牌變成一信息幀的幀起始定界符，加掛上構(gòu)成一幀所需要的其余字段以發(fā)送信息，網(wǎng)絡(luò)上的其它結(jié)點都在接收信息。當本站檢測到幀的目的地址與本站地址相符時，就接收該信息幀。同時轉(zhuǎn)發(fā)該幀，直到該幀回到發(fā)送站，才把該幀釋放。FOXBORO 2AX-ALM-AR再發(fā)送新令牌。這種協(xié)議的特點是持有令牌的結(jié)點才能發(fā)送信息。令牌廣播式協(xié)議的網(wǎng)絡(luò)中，可以連接多個人機界面的結(jié)點。在網(wǎng)絡(luò)上的結(jié)點都是平等的。每一個結(jié)點都有機會發(fā)送信息。如美國BAILEY的INFI9090是令牌廣播網(wǎng)。存儲轉(zhuǎn)發(fā)協(xié)議是一個結(jié)點發(fā)出信息，傳給下一個，這個結(jié)點接到信息，必需先存下來，如果自己要，就可以接收下來，如果不需要，就把它轉(zhuǎn)發(fā)出去。直至到需要這個信息的結(jié)點為止。然后信息再返回到源結(jié)點，才釋放這個信息。這種協(xié)議用于環(huán)形網(wǎng)絡(luò)中。這種環(huán)形網(wǎng)絡(luò)可以長達幾公里。如美國BAILEY的NETWORK90的廠區(qū)環(huán)路就是這樣的網(wǎng)絡(luò)。不管什么結(jié)構(gòu)形式的網(wǎng)絡(luò)，連到網(wǎng)絡(luò)上的結(jié)點的總數(shù)是有限制的，至于什么樣的結(jié)點，有幾個，它是不受限制的。
在DCS網(wǎng)絡(luò)中，數(shù)據(jù)傳輸是以信息幀的形式傳輸?shù)?。它是同步發(fā)送星息。半雙工發(fā)送。雙工發(fā)送的極少。每一幀信息都有信息頭，信息尾，F(xiàn)OXBORO 2AX-ALM-AR信息幀中緊跟首旗的是地址，其中包括信號發(fā)出的結(jié)點的源地址，如結(jié)點號、模件號、功能塊號以及接收信息的結(jié)點的目的地址，如結(jié)點號、模件號和功能塊地址。信息幀的中間是數(shù)據(jù)，再后面是校驗。校驗最多的是采用循環(huán)冗余校驗。CRC碼是一種高效能的檢錯和糾錯碼。數(shù)據(jù)在傳輸過程中，可以是一幀，也可以是兩幀，如果是兩幀，頭幀是旗，第二幀才是數(shù)據(jù)。最長的一幀信息可長達200多個字節(jié)。采用存儲轉(zhuǎn)發(fā)協(xié)議的網(wǎng)絡(luò)中，當一個結(jié)點發(fā)生故障時，把這個結(jié)點旁通，讓信息通過。
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