中英文智能樓宇自動化系統(tǒng)方案-文庫吧在線文庫
【正文】 0mA的直流電信號，它是通過A／D轉(zhuǎn)換器來實現(xiàn)的。直接數(shù)字控制系統(tǒng)的基本算法按照偏差的比例(P)、積分(I)和微分(D)進行控制，是連續(xù)系統(tǒng)中技術(shù)成熟、應(yīng)用最為廣泛的一種基本規(guī)律，將PID控制規(guī)律離散化并在計算機上實現(xiàn)，可以方便地利用已積累的成熟技術(shù)，而且可以在被控對象的數(shù)學(xué)模型或參數(shù)不很清楚的情況下，經(jīng)過在線整定達到滿意的效果。Systems簡稱DCS)20世紀于70年代中期出現(xiàn)并迅速發(fā)展起來，它將計算機技術(shù)、控制技術(shù)、圖形顯示技術(shù)和通信技術(shù)匯集于一體，可對分散在現(xiàn)場的設(shè)備進行控制，又可方便地集中管理、操作，與以往的控制系統(tǒng)相比，既避免了單臺計算機集中控制的不足，又克服了常規(guī)儀表人機交互困難的缺點。如：控制站采用雙CPU板，雙I／0板等。MS／TP是一種主／從令牌傳遞數(shù)據(jù)鏈路層技術(shù)，允許使用EIA485硬件。s basic functions can be summarized as follows: (1) automatic monitoring and control of various electrical and mechanical equipment, the stop, display or print the current operating state. (2) automatic detection, display, print a variety of electrical and mechanical equipment operating parameters and changes in trends or historical data. (3) According to external conditions, environmental factors, the change automatically adjust the load of equipment, so that is always running in top condition. (4) monitoring and timely processing of all accident emergencies(5) to achieve a variety of electrical and mechanical equipment on building a unified management, coordination and control. (6) Energy management: water, electricity, gas metering and charging, etc., to achieve energy management automation. (7) Equipment Management: including device files, equipment operation and equipment maintenance management reports. 3, the principle of building automation control systemBuilding control system used is based on modern control theory, distributed puter control system, also known as distributed control system (Distributedcontrol systems referred to as DCS). It is characterized by a centralized management decentralized control, that is charged with distribution of equipment in the field office of the microputer control (DDC) to plete device charged with the task of realtime detection and control, centralized control of puter to overe the risks of high lack of centralized control and conventional single instrument in the central control room of the central management puter with CRT display, print output, extensive software management and a strong digital munications capabilities to plete the centralized operation, display, alarm, tasks such as printing and optimal control, avoiding Changgui instrument control is distributed difficulties after the manmachine contact, no unified management shortings, ensure that equipment running in top form.Here are distributed control systems with several concepts. direct digital control system (DDC) direct digital control system (Direct Digital Control referred to as DDC) shown in Figure 2. Computer through the analog input channels (AI) and digital input channels (DI) realtime data collection, and then calculated according to certain rules, and finally the control signals, and through the analog output channels (AO) and the switch output channel (DO ) direct control of the production process. So DDC system is a closed loop control system, a puter in the industrial production of the most popular way of an applicationDDC system control puter to undertake tasks, which required realtime, high reliability and
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