PLC四層電梯教學(xué)系統(tǒng)外文資料

1、外文資料翻譯Application of PLC in the Elevator Control System ofIntelligence BuildingIn 1980s the first intelligence mansion had been completed in America, then intelligence building has been a broadly taken attentions by the whole world. The concept of intelligence building has been put different meaning

2、s along with the development of society. The early stage intelligence building had been thought that it is equal to the intelligence mansion, but now the intelligence building not only includes the intelligence mansions but also involves intelligence residential districts. This paper mainly discusse

3、s one subsystem of intelligence building system: the elevator control system.In intelligence residential districts the enterprises information managing system mainly takes charge of the things which related to the daily life, for example supervising the district equipments, managing vehicles, dispos

4、ing critical situations and so on.The elevator supervising and control system is also necessary to the intelligence residential districts. How to make people feel safe, stable and comfortable and how to save energy resources and protect environments and so on are the basic requirements to the elevat

5、or control system.PLC is a common industry control device. It is a special industry control computer which has the perfect function and simple frame. The PLC strong ability in interference and so on makes the elevator industry one after another to apply the PLC to the elevator control system, in ord

6、er to replace the relay being used in traditional elevator control system. The Application of PLC in the elevator control system reduces the breakdown rate and efficiently improves the operating reliability of the elevator with safety. This paper mainly discusses the elevator control systems working

7、 principles, the systems software and hardware realization methods and so on.The Working Principles of Elevator Control System are stated as follows: The spot control information is send into the PLC from the customer input devices firstly, then the PLC control cabinet is required to send out the co

8、ntrol signal to drive the equipments according to the system demands. The elevator can then perform the homologous action according to the control request. There are velocity feedback devices in system, which adopt measure velocity generators to provide the elevator velocities and generally are inst

9、alled in the tail of tow motors. So this is a feedback control system, which can improve the systems control precision. It is not necessary to do interface circuit in the elevators PLC control system. What we should do is to send the signals to PLC digital input terminals. The signals include inside

10、 and outside calling signals, floor location inspecting signals, limiting location signals, opening and shutdown the elevator door signals etc. The DC power which is provided to PLC can be used as indicator light power. The PLC output points can be directly used to control transducers for the purpos

11、e of electrical motors positive turn and reverse, stop and control each segment velocity and so on.Moreover, input and output devices are needed in elevator control system, besides the PLC, systems major control device.The control cabinet is the control center, from which we can send out various con

12、trol commands. The control cabinet often was installed in the elevator room. The electric devices and signal systems, for example the contactors, relays, capacitances, resistors, rectifiers and transformers etc, are centralized in the control cabinet. The Power of the control cabinet was imported fr

13、om the chief power of the elevator room. This power was also introduced into control panel by soft cables and was linked with each control buttons. The power lines which was derived from control cabinet was delivered to tow electric motors. Others control lines and signal lines were separately sent

14、to each floor junction.The design includes two parts: hardware and software. The hardware design is the base of software. Considering that the control demands are relatively complex, we design the programs separately according to the control function. Furthermore, we follow the principle as follows:

15、 When the elevator is ascending, the ascending demands are prior to other demands.When the elevator is descending, the descending demands are prior to other demands. The Sequential Function Chart(SFC) is adopted during the boxes to form elevators executive circuitry design. It is a method specially

16、used in industrial sequential control. The SFC method can describe the systems working procedure in great detail.When all SFC are drawn and I/O address lists are presented, we can convert the SFC to Ladder Diagram(LD). Considering the strict demands for time and for locked each other, we introduce w

17、orking bits to remember working steps. We should write out the working bits control program, which can link together each step and make the pervious step as the next step restriction condition. Thus the actual outputs are the logic combination of these working steps. The system program has been debu

18、gged completely at present. Simulated experiment enunciates that the design method is viable. Application of PLC in the elevator control system is an effective method. It can make the personnel of the industry management center to long-distance monitor and control the elevator in control center, to

19、connect the elevator system with intelligence building industry management system by Ethernet or special-purpose network such as Lon Works. The elevator, but also can lower the elevator maintenance costs etc. It is one of the developing direction of intelligence building elevator control system.Lift

20、 control systemLift control system is used to manipulate each control process by managing such commands as running direction, car call, landing call, load signal, landing indication, safety protection.Lifts in different applications have different load, speed and drive / control modes. Lifts in same

21、 application may also have different control mode. Whatever control mode is adopted, the objective is the same, to be specific, according to car call and landing call, lift control system will execute automatic logic judgment to determine which lift will receive signal, which direction lift will run

22、 towards and complete programmed control objective through electrical automatic system based on command. Types of lift control system Control system development chronicle indicates that there has appeared many control modes, such as such as relay control, PLC, single computer control, multiple-compu

23、ter control. Prevailing in different era, these control modes are still employed in lifts now due to massive integrated circuit and computer technology development. PLC control systemAs abbreviation of programmable logic controller, PLC is an electronic system featuring digital computation. It adopt

24、s programmable EPROM to execute logic computation, order control, timing, number counting, arithmetic computation, besides, it can input and output through digital or analogy modes.The mechanism of PLC control is as follows: input of PLC includes such command signals, as power key to home landing, c

25、ar call, landing call, various safety switches, position signal, while output of PLC includes contactor, relay, indicators of car / landings and communication unit.ay, indicators inside car and switch, position signal, are input to PC, while other executing comProgramming principle is determined by

26、lift control mode. Programming can either be made according to relay logic control circuit or individually in different phases according to lift control functions after completely separating from relay control circuit. Based on the ready made control circuit, the former is simple and easy to master,

27、 while the latter involves less programs by integrating programs of small function.Used in lift control system, PLC has such advantages, as high reliability, stability, easy programming, user-friendliness, convenient maintenance & inspection. Nowadays, there is a wide range and series of program

28、mable logic controllers. Input / output points range from 30 to 8000 or above, so as to meet lift control requirements with different landing number.譯 文PLC在智能建筑電梯控制系統(tǒng)中的應(yīng)用在20世紀(jì)80年代，第一座智能大廈在美國竣工，之后智能建筑引起了全世界的關(guān)注。隨著社會的發(fā)展，智能建筑有著不同的含義。早期智能建筑被認(rèn)為是等同于智能大廈，但是現(xiàn)在智能建筑不僅涉及智能大廈，而且還涉及智能住宅小區(qū)。本文主要討論了智能建筑系統(tǒng)的一個(gè)子系統(tǒng)：電梯控制

29、系統(tǒng)。智能住宅區(qū)內(nèi)企業(yè)的信息管理系統(tǒng)主要是負(fù)責(zé)涉及到日常生活的事物，例如監(jiān)管住宅區(qū)內(nèi)的設(shè)備，車輛，處理緊急情況等等，電梯的監(jiān)管可控制系統(tǒng)對智能住宅區(qū)來說也是必須的。如何使人們感到安全，穩(wěn)定和舒適，以及如何節(jié)約能源資源和保護(hù)環(huán)境等是電梯控制系統(tǒng)的基本要求。Plc可編程控制器是一種常見的工業(yè)控制設(shè)備，是一種特殊的工業(yè)控制計(jì)算機(jī)，具有完善的功能和簡單的框架。PLC具有強(qiáng)抗干擾能力等優(yōu)點(diǎn)，使得電梯工業(yè)一次又一次將PLC應(yīng)用與電梯控制系統(tǒng)，以取代傳統(tǒng)的使用繼電器控制電梯系統(tǒng)。PLC在電梯控制系統(tǒng)應(yīng)用，減低了故障率，并有效地提高了電梯運(yùn)行的可靠性與安全性。本文主要論述了電梯控制系統(tǒng)的工作原理，系統(tǒng)的軟件和

30、硬件實(shí)現(xiàn)方法等。電梯控制系統(tǒng)工作原理說明如下：首先將使用者現(xiàn)場的輸入信息發(fā)送到plc中，然后plc控制裝置通過系統(tǒng)要求發(fā)出信號以驅(qū)動外圍設(shè)備，然后電梯根據(jù)控制要求執(zhí)行相應(yīng)的動作，系統(tǒng)中的速度反饋裝置，采用的是測速裝置測出電梯運(yùn)行速度反饋控制裝置，通常安裝在曳引電動機(jī)的后面，所以該系統(tǒng)是一個(gè)反饋控制系統(tǒng)，可提高系統(tǒng)的控制精度。電梯的PLC控制系統(tǒng)的接口電路不需要設(shè)計(jì)，我們要做的是將信號，包括梯內(nèi)外召喚信號，平層監(jiān)測信號，開門和關(guān)門信號等發(fā)送個(gè)plc的數(shù)字輸入端口。Plc中的直流電源，提供給指示燈。Plc的輸出點(diǎn)直接控制傳感器，以達(dá)到電動機(jī)正傳和反轉(zhuǎn)，停機(jī)的目的。此為，電梯控制系統(tǒng)中除了plc和主

31、要控制裝置外還包括其它的輸入和輸出裝置?？刂乒袷钦麄€(gè)控制系統(tǒng)的核心部分，可以發(fā)送各種控制命令，通常安裝在電梯室內(nèi)。電氣設(shè)備和信號裝置。例如，接觸器，繼電器，電容，電阻，整流器和變壓器等，也都安裝在控制柜內(nèi)。控制柜中的電源是由電梯室內(nèi)的主電源提供。電梯室內(nèi)的主電源還通過由軟電纜做成的導(dǎo)線連接到各個(gè)控制按鈕。電動機(jī)也是由它供電。控制線和信號線分別接至各個(gè)樓層。設(shè)計(jì)包括兩個(gè)部分：硬件和軟件。硬件設(shè)計(jì)是軟件設(shè)計(jì)的基礎(chǔ)。考慮到控制的要求相對復(fù)雜，我們按照控制功能將程序分塊。此外電梯還必須遵循以下調(diào)度原則：當(dāng)電梯上行時(shí)，任何反方向即下降的按鈕呼梯均無效；當(dāng)電梯下行途中，任何上升的按鈕呼梯均無效。順序功能圖SFC在設(shè)計(jì)過程中被采用，它廣泛應(yīng)用于工業(yè)順序控制。順序功能圖SFC能夠詳細(xì)、直觀的描述系統(tǒng)的工作過程。當(dāng)所有的順序功能圖都設(shè)計(jì)完，I/O地址分配好，我們可以將順序功能圖SFC轉(zhuǎn)化成符號梯形圖（LD），考慮到嚴(yán)格的定時(shí)時(shí)間和互鎖，我們采用步來代表工作步驟。我們應(yīng)當(dāng)寫出各步的控制程序，通過限制條件來控制下一