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First, DCS's skeleton - the system network, which is the foundation and core of DCS.

網(wǎng)絡對于DCS整個系統(tǒng)的實時性、可靠性和擴充性，起著決定性的作用，

各廠家都在這

進行了精心的設計。 As the network of the system for real-time DCS, reliability and scalability, play a decisive role, so the manufacturers have been careful in this area of design. 對于DCS的系統(tǒng)網(wǎng)絡

，它

滿足實時性的要求，即在確定的時間限度內(nèi)完成信息的傳送。 DCS system for the network, it must meet the requirements of real-time, that is completed within defined time limits of information transmission. 這里所說的“確定”的時間限度，是指在無論何種

下，信息傳送都能在

時間限度內(nèi)完成，而

時間限度則是根據(jù)被控制過程的實時性要求確定的。 Here called "OK" time limit refers to whether the circumstances, the information transfer can be completed within this time limit, but this time limit will be under the control of the process to be determined in real-time requirements.

，衡量系統(tǒng)網(wǎng)絡性能的指標并不是網(wǎng)絡的速率，即通常所說的每秒比特數(shù)（bps），而是系統(tǒng)網(wǎng)絡的實時性，即能在多長的時間內(nèi)確保所需信息的傳輸完成。 Therefore, network performance measurement system is not the network speed indicators, known as bits per second (bps), but the network's real-time system that can ensure long time to complete the required information transmission . 系統(tǒng)網(wǎng)絡還

非常可靠，無論在

下，網(wǎng)絡通信都不能中斷，

多數(shù)廠家的DCS均采用雙總線、環(huán)形或雙重星形的網(wǎng)絡拓撲結構。 Network also have to be very reliable in any case, network communications are not interrupted, so most manufacturers of DCS were double bus, ring or dual star network topology.

滿足系統(tǒng)擴充性的要求，系統(tǒng)網(wǎng)絡上可接入的最大節(jié)點數(shù)量應比

使用的節(jié)點數(shù)量大若干倍。 Scalability to meet the requirements of the system, the system can access the network should be the maximum number of nodes than the actual number of nodes used in a large number of times. 這樣，一

可以隨時

新的節(jié)點，另一

也可以使系統(tǒng)網(wǎng)絡運行于較輕的通信負荷

，以確保系統(tǒng)的實時性和可靠性。 In this way, one can always add new nodes, it can also make the system run on less communication network load conditions to ensure the system's real-time and reliability. 在系統(tǒng)

運行過程中，各個節(jié)點的上網(wǎng)和下網(wǎng)是隨時

發(fā)生的，特別是操作員站，這樣，網(wǎng)絡重構會經(jīng)常進行，而這種操作絕對不能影響系統(tǒng)的正常運行，

，系統(tǒng)網(wǎng)絡應該具有很強在線網(wǎng)絡重構功能。 Actual operation in the system process, each node of the Internet and into the net may occur at any time, especially operator station so that network reconfiguration will be conducted frequently, and this operation definitely not influence the systems up and running, so the system network should have a strong online network reconfiguration functions.

其次，這是一種

對現(xiàn)場I/O

并實現(xiàn)直接數(shù)字控制（DOS）功能的網(wǎng)絡節(jié)點。 Secondly, it is a completely on-site I / O processing and realization of direct digital control (DOS) function in network nodes.

一套DCS中要設置現(xiàn)場I/O控制站，用以分擔整個系統(tǒng)的I/O和控制功能。 To set the general scene in a DCS I / O controllers, to share the whole system I / O and control functions. 這樣既可以避免

一個站點失效造成整個系統(tǒng)的失效，提高系統(tǒng)可靠性，也可以使各站點分擔數(shù)據(jù)采集和控制功能，有利于提高整個系統(tǒng)的性能。 This will not only avoid failure due to a site caused by the failure of the system, improve system reliability, but also allows the site to share data acquisition and control functions, will help improve overall system performance. DCS的操作員站是

一切與運行操作有關的人機界面（HMI-Human Machine Interface或operator interface）功能的網(wǎng)絡節(jié)點。 DCS operator station is run operation to deal with all the human-machine interface (HMI-Human Machine Interface, or operator interface) function of network nodes.

系統(tǒng)網(wǎng)絡是DCS的工程師站，它是對DCS進行離線的配置、組態(tài)工作和在線的系統(tǒng)監(jiān)督、控制、維護的網(wǎng)絡節(jié)點，其主要功能是提供對DCS進行組態(tài)，配置工作的工具軟件（即組態(tài)軟件），并在DCS在線運行時實時地監(jiān)視DCS網(wǎng)絡上各個節(jié)點的運行

，使系統(tǒng)工程師可以通過工程師站及時

系統(tǒng)配置及

系統(tǒng)參數(shù)的設定，使DCS隨時處在最佳的工作

之下。 Network is a DCS engineer station, it is a DCS configuration offline, online system configuration work and supervision, control, maintenance of network nodes, its main function is to provide DCS configuration, configuration of tools for software (ie configuration software ) and running online in real time DCS DCS network to monitor the operation of each node so that system engineers can adjust the system configuration engineer station in a timely manner and some system parameter setting, so that at any time in most DCS under good working condition. 與集中式控制系統(tǒng)不同，

的DCS都要求有系統(tǒng)組態(tài)功能，可以說，沒有系統(tǒng)組態(tài)功能的系統(tǒng)就不能稱其為DCS。 And centralized control systems, all of the DCS are required to have system configuration functions, can be said that no system configuration capabilities of the system would not be called DCS.容－源－電－子－網(wǎng)－為你提供技術支持

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