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英文文獻原文及翻譯---工業(yè)以太網(wǎng)與智能建筑-建筑結(jié)構(gòu)-文庫吧資料

2025-05-21 18:30本頁面
  

【正文】 s, industrial control for the existence of the following questions: (1) using Ether CSMA / CD Access Protocol, which is a nondeterministic work The high demand for realtime control systems, this uncertainty will result in the requested information can not convey. The socalled work segment is even shared the same bus work, you can listen to the message sent by the other side, at the same collision regional conflict (a conflict that will impact the region) of workstations and servers to connect the work area. For example, in a collision conflict in the region have a working group (from a server and workstation ponents multiple), when more than one visit a server workstation, due to the CSMA / CD bound by the same time allowing only a workstation and server Communications, can only wait for the other workstations. Competition for the workstation munication channel so that the munication workstations have delayed, and this extension When the time is uncertain, workstations more petition for munications for the longer this situation known as the load was more severe the longer the waiting time. If in a collision domain, assume that two working groups, in a collision domain, the first work group servers, workstations access to petitive broadband works (such as 100 M), another working group of all workstations and servers Are in a wait state and can not run. The two working groups to split the original broadband work (100 M), a working group work, must wait for another group, this has not only delayed, and this delay is uncertain. As CSMA / CD have unforeseen delay, particularly in the heavy load, the more realtime data transmission can not be guaranteed. Therefore Ether control system must be solved for realtime and uncertainty. (2) Ether in reliability than Bus at the scene 16 Field Bus is designed for industrial control, able to adapt flammable, explosive (such as chemicals, pharmaceuticals), strong interference and other occasions poor environment occasions. Field bus have shielding, grounding and explosionproof measures, such as Ether and the need to address these issues. (3) Field bus specifications on the work segment with a power supply For all nonselfpowered equipment to power and Ether does not provide power, the need for additional electricity supply lines. 17 5 feasibility of the application of Industrial Ether Industrial Ether for industrial control, the abovementioned problems, with the Ether technology development and the implementation of corresponding measures, in fact, and the uncertainty can be made great improvements: (1) Continuously improve Ether rate: The rate in recent years Ether from 10 Mbps, 100Mbps to 1 000Mbps and has been widely applied. At present 10 Gaps Ether has been mercialized, greatly shortening the data transmission time, improve response time, the system39。s first LAN standard. 1983 IEEEE802 Committee DIX EtherV2 based introduced IEEE803, using the CSMA / CD MAC technology. refer to a CSMA / CD works, and Ether DIX EtherV2 from the standard definition, not strictly in the circumstances, can be called LAN, which is Ether. To the modern manufacturing industry as an example, its modern manufacturi ng automation model in Figure Industrial Ether is the mercial application of Ether to industrial control systems, the two works is not essentially different from, the two are patible. (2) CSMA / CD (Carrier Sense Multiple Access with Collision Detection Multicarrier monitoring visit / conflict detection) CSMA / CD are the first improvement es from CSMA. ① CSMA (Carrier monitor multiple access): stop trying to send a signal, first of all to monitor bus, to determine whether there is other media, to stop the signal. ? If the media is free, you can send。 ② Intelligent Building of the urban information system integration, the development of digital, intelligent building (including intelligent residential district), has bee a digital city39。 ? Control of the data obtained from the scene equipment, plete the various control, monitoring operating parameters, alarm and historical trend analysis。s Mitsubishi, France Schneider, the current number of bus standards at the same time the situation still exists, they say the openness and interoperability only At the same can be achieved under a bus standard, different standards between the bus is still limited. The interconnection between different bus and can not be guaranteed, so people in their efforts to seek a unified standard field bus, some people have proposed the use of TCP / IP protocol Ether. (2) The demand for system integration ① industrial automation control integrated enterprise information is China39。以工業(yè)以太網(wǎng)為核心的測控技術(shù)是測控領(lǐng)域中的一個重要發(fā)展方向,但其實時性、可靠性、安全性、互操作性等尚需進一步研究完善。建筑中有了眾多設備提供的優(yōu)秀服務,智能建筑就成了一套智能服務系統(tǒng)集合,這正是人們所期待的。 ④ 將控制系統(tǒng)升級為服務系統(tǒng) 該系統(tǒng)始終貫穿一種服務的理念,將設備的控制升級為設備對外提供的信息服務。 ② 采用網(wǎng)絡控制服務管理方式 中央控制中心是一套主服務器,控制各參量集成模塊,可集中或分布處理各種數(shù)據(jù),通過參量集成模塊完成各種類型控制要求。 (3) ENC 系統(tǒng)特點 ① 實現(xiàn)信息網(wǎng)絡與控制網(wǎng)絡統(tǒng)一 取消控制網(wǎng)與信息網(wǎng)的界限,控制信息化。 ② 硬件結(jié)構(gòu):由中央處理器 MCU、以太網(wǎng)網(wǎng)卡、傳感器、執(zhí) 行器、 I/O 接口以及存儲器(電子硬盤),電源組成 。 遠程工作站:實際上是遠程監(jiān)控瀏覽器( Broswer)在網(wǎng)上通過瀏覽器對系統(tǒng)進行監(jiān)視 (2) ENC 參量集成模塊 ENC 參量集成模塊由北京樓宇自控中心開發(fā)。 WEB 服務:完成對整個系統(tǒng)的操作控制。除此之外還提供 CDMA/GRPS 無線網(wǎng)關(guān)接口,例如系統(tǒng)報警信息即可通過
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