26uuu人妻一区_distributed control system Details

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

網(wǎng)絡(luò )對于DCS整個(gè)系統的實(shí)時(shí)性、可靠性和擴充性，起著(zhù)決定性的作用，

各廠(chǎng)家都在這

進(jìn)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(wǎng)絡(luò )

，它

滿(mǎn)足實(shí)時(shí)性的要求，即在確定的時(shí)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(shuō)的“確定”的時(shí)間限度，是指在無(wú)論何種

下，信息傳送都能在

時(shí)間限度內完成，而

時(shí)間限度則是根據被控制過(guò)程的實(shí)時(shí)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(wǎng)絡(luò )性能的指標并不是網(wǎng)絡(luò )的速率，即通常所說(shuō)的每秒比特數（bps），而是系統網(wǎng)絡(luò )的實(shí)時(shí)性，即能在多長(cháng)的時(shí)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(wǎng)絡(luò )還

非�？煽�，無(wú)論在

下，網(wǎng)絡(luò )通信都不能中斷，

多數廠(chǎng)家的DCS均采用雙總線(xiàn)、環(huán)形或雙重星形的網(wǎng)絡(luò )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(mǎn)足系統擴充性的要求，系統網(wǎng)絡(luò )上可接入的最大節點(diǎn)數量應比

使用的節點(diǎn)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(shí)

新的節點(diǎn)，另一

也可以使系統網(wǎng)絡(luò )運行于較輕的通信負荷

，以確保系統的實(shí)時(shí)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(guò)程中，各個(gè)節點(diǎn)的上網(wǎng)和下網(wǎng)是隨時(shí)

發(fā)生的，特別是操作員站，這樣，網(wǎng)絡(luò )重構會(huì )經(jīng)常進(jìn)行，而這種操作絕對不能影響系統的正常運行，

，系統網(wǎng)絡(luò )應該具有很強在線(xiàn)網(wǎng)絡(luò )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(chǎng)I/O

并實(shí)現直接數字控制（DOS）功能的網(wǎng)絡(luò )節點(diǎn)。 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(chǎng)I/O控制站，用以分擔整個(gè)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(gè)站點(diǎn)失效造成整個(gè)系統的失效，提高系統可靠性，也可以使各站點(diǎn)分擔數據采集和控制功能，有利于提高整個(gè)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(guān)的人機界面（HMI-Human Machine Interface或operator interface）功能的網(wǎng)絡(luò )節點(diǎn)。 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(wǎng)絡(luò )是DCS的工程師站，它是對DCS進(jìn)行離線(xiàn)的配置、組態(tài)工作和在線(xiàn)的系統監督、控制、維護的網(wǎng)絡(luò )節點(diǎn)，其主要功能是提供對DCS進(jìn)行組態(tài)，配置工作的工具軟件（即組態(tài)軟件），并在DCS在線(xiàn)運行時(shí)實(shí)時(shí)地監視DCS網(wǎng)絡(luò )上各個(gè)節點(diǎn)的運行

，使系統工程師可以通過(guò)工程師站及時(shí)

系統配置及

系統參數的設定，使DCS隨時(shí)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(tài)功能，可以說(shuō)，沒(méi)有系統組態(tài)功能的系統就不能稱(chēng)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(shù)支持

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distributed control system Details