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

網絡對于DCS整個系統的實時性、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的系統網絡

，它

滿足實時性的要求，即在確定的時間限度內完成信息的傳送。 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

時間限度內完成，而

時間限度則是根據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.

，衡量系統網絡性能的指標并不是網絡的速率，即通常所說的每秒比特數（bps），而是系統網絡的實時性，即能在多長的時間內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 . 系統網絡還

非�？煽�，無論在

下，網絡通信都不能中斷，

多數廠家的DCS均采用雙總線、環形或雙重星形的網絡拓撲結構。 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.

滿足系統擴充性的要求，系統網絡上可接入的最大節點數量應比

使用的節點數量大若干倍。 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

新的節點，另一

也可以使系統網絡運行于較輕的通信負荷

，以確保系統的實時性和可靠性。 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

運行過程中，各個節點的上網和下網是隨時

發生的，特別是操作員站，這樣，網絡重構會經常進行，而這種操作絕對不能影響系統的正常運行，

，系統網絡應該具有很強在線網絡重構功能。 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

對現場I/O

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

一套DCS中要設置現場I/O控制站，用以分擔整個系統的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的失效，提高系統可靠性，也可以使各站點分擔數據采集和控制功能，有利于提高整個系統的性能。 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）功能的網絡節點。 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.

系統網絡是DCS的工程師站，它是對DCS進行離線的配置、組態工作和在線的系統監督、控制、維護的網絡節點，其主要功能是提供對DCS進行組態，配置工作的工具軟件（即組態軟件），并在DCS在線運行時實時地監視DCS網絡上各個節點的運行

，使系統工程師可以通過工程師站及時

系統配置及

系統參數的設定，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. 與集中式控制系統不同，

的DCS都要求有系統組態功能，可以說，沒有系統組態功能的系統就不能稱其為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－為你提供技術支持

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