20AC022A0AYYANC0
20AC022A0AYYANC0
20AC022A0AYYANC0
20AC022A0AYYANC0
1. 拓撲結(jié)構(gòu)的選擇
常用的網(wǎng)絡(luò)拓撲結(jié)構(gòu)有總線型、環(huán)型和星型結(jié)構(gòu),為了便于網(wǎng)絡(luò)管理和網(wǎng)絡(luò)擴展,本方案采用總線型拓撲結(jié)構(gòu)。
2. 組網(wǎng)技術(shù)的選擇
目前常用的校園網(wǎng)主干網(wǎng)組網(wǎng)技術(shù)有100Mbps的快速以太網(wǎng),100Mbps的FDDI, ATM網(wǎng)絡(luò)和千兆以太網(wǎng)。本網(wǎng)絡(luò)主要采用10Mbps細纜以太交換網(wǎng)作為主干網(wǎng)的組網(wǎng)技術(shù),快速以太交換網(wǎng)是性能較高的組網(wǎng)方式。它具有以下優(yōu)點:技術(shù)成熟穩(wěn)定;對傳統(tǒng)的局域網(wǎng)及其應(yīng)用有很好的支持;有效保護用戶投資。
二.網(wǎng)絡(luò)系統(tǒng)功能分析
IFIX監(jiān)控系統(tǒng)采取客戶/服務(wù)器(Client/Server)的結(jié)構(gòu)方式,使用輸入/輸出服務(wù)器(I/O server)的專管與各過程控制站的數(shù)據(jù)通訊功能,監(jiān)測操作站和服務(wù)器之間則使用局域網(wǎng)相連。由于系統(tǒng)以擴展性架構(gòu)作為其關(guān)鍵性的結(jié)構(gòu)原則,所以具有近乎任意的擴展能力。
在鋼廠的熱軋系統(tǒng)應(yīng)用中,加熱爐和煤氣站的兩套系統(tǒng)各使用兩套COMPAQ服務(wù)器,作為各自系統(tǒng)互為冗余的主,副I/O Server,服務(wù)器使用16口高速串行數(shù)據(jù)通訊板(Digibord) PC 16i / PC 4e,與MODCELL控制站MODBUS協(xié)議(RS485方式)進行數(shù)據(jù)通訊,從而保證服務(wù)器與MODCELL過程控制級之間的所有過程數(shù)據(jù)信息交換在ms內(nèi)完成。過程控制級包括控制主站和子站,每一套子站對應(yīng)于與監(jiān)控級通訊的一個數(shù)字通道。加熱爐過程控制級包括1、2、3、4號爐和公用部分(蒸汽、重油系統(tǒng))共5套MODCELL控制站,下屬30個控制子站,煤氣站過程控制級為一個控制主站,包括4個控制子站。
加熱爐系統(tǒng)使用4臺,煤氣站使用兩臺PC機承擔操作站功能,系統(tǒng)內(nèi)的6臺計算機使用10Mpbs細纜以太網(wǎng)相連,兩系統(tǒng)之間通過一條1公里長的光纜互聯(lián),實現(xiàn)了兩個區(qū)域系統(tǒng)的一體化和過程數(shù)據(jù)的共享。
IFIX作為基于bbbbbbs NT 核心開發(fā)的應(yīng)用程序,IFIX技術(shù)充分利用了這一網(wǎng)絡(luò)操作系統(tǒng)的可靠性和穩(wěn)定性,系統(tǒng)的I/O Server實際上擔當了NT網(wǎng)絡(luò)管理和IFIX應(yīng)用程序的雙重服務(wù)器功能。
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