控制器、服務(wù)器和客戶(hù)機(jī)三者之間的連接有兩種情況：一是DCS控制器有以太網(wǎng)接口，三者用以太網(wǎng)交換機(jī)來(lái)連接。交換機(jī)有多種端口，每個(gè)端口數(shù)據(jù)傳輸速率可以不等。端口數(shù)量由連接的計(jì)算機(jī)臺(tái)數(shù)決定。交換機(jī)主要指標(biāo)是背板寬度和存儲(chǔ)器大小。如果采用以太網(wǎng)電纜如10BASE、100BASE等的速率都可傳輸，如采用5類(lèi)線只能是10BASE。在圖2以太網(wǎng)的連接是星型。使用離散的
電纜將每臺(tái)計(jì)算機(jī)連接到中央連接點(diǎn)，通常稱(chēng)為網(wǎng)絡(luò)集線器。每臺(tái)計(jì)算機(jī)使用獨(dú)立電纜，連接失敗只影響有關(guān)的單臺(tái)計(jì)算機(jī)，其他計(jì)算機(jī)可繼續(xù)運(yùn)行。如果各臺(tái)機(jī)器適配器速率相同，以太網(wǎng)星型連接通常使用10BaseT電纜。
Two kinds of hardware of c/s structure network, usually called client PC and server. The client PC is in the central control room and the server is in a safe place. The causes of DCS operation station crash are complicated. This article is limited to analyzing the causes of the crash caused by the c/s structure. There are two cases:There are two kinds of connections among controller, server and client: one is that DCs controller has Ethernet interface, and the three are connected by Ethernet switch. The switch has a variety of ports, and the data transmission rate of each port can be different. The number of ports is determined by the number of computers connected. The main indicators of the switch are the backplane width and memory size. If Ethernet cables such as 10base and 100base are used, the rate can be transmitted. If category 5 cable is used, it can only be 10base. In Figure 2, the Ethernet connection is star shaped. Use discrete
Cables connect each computer to a central connection point, commonly referred to as a network hub. Each computer uses an independent cable. The connection failure only affects the relevant single computer, and other computers can continue to run. If each machine has the same adapter rate, the Ethernet star connection usually uses a 10baset cable.
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