【導(dǎo)讀】是以計(jì)算機(jī)技術(shù)為核心的通用自動(dòng)控制裝置，在各行各業(yè)中得到了廣泛的應(yīng)用。行業(yè)中，PLC的作用得到了充分的體現(xiàn)。本文介紹了PLC控制的五層電梯模型的構(gòu)成、主要功能、PLC的I/O接口分配、PLC的編程方法及對(duì)電梯系統(tǒng)的程序設(shè)計(jì)等。?？块_門、信號(hào)排隊(duì)、順向截梯和報(bào)警等控制功能。21世紀(jì)將會(huì)發(fā)展多用途、全功能的塔式建筑，超高速電梯繼續(xù)成為研究方向。采用直線電機(jī)驅(qū)動(dòng)的電梯也有較大研究。未來超高速電梯舒適感會(huì)有明顯提高。情況和使用數(shù)量已成為一個(gè)國家現(xiàn)代化程度的標(biāo)志之一。成單臺(tái)電梯PLC控制系統(tǒng)的總體設(shè)計(jì)方案、組成及模塊化程序設(shè)計(jì)。數(shù)為35，選用三菱FX2-80MRPLC型的PLC，并進(jìn)行了外圍接線設(shè)計(jì)；最后進(jìn)行軟件編程。電梯，為高層運(yùn)輸做出了不可磨滅的貢獻(xiàn)。由于PLC具有邏輯運(yùn)算，計(jì)數(shù)和定時(shí)以及數(shù)據(jù)輸入輸出的功能。種邏輯開關(guān)控制與PLC很好的結(jié)合，很好的實(shí)現(xiàn)了對(duì)的控制。提出PLC概念的是美國通用汽車公司。

　　

【正文】 om which we can send out various control mands. The control cabi 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 cabi. The Power of the control cabi was imported from 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 cabi was delivered to tow electric motors. Others control lines and signal lines were separately sent 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 plex, we design the programs separately according to the control function. Furthermore, we follow the principle as follows: When the elevator is ascending, the ascending demands are prior to other the elevator is descending, the descending demands are prior to other demands. The Sequential Function Chart(SFC) is adopted during the boxes to form elevator’s executive circuitry design. It is a method specially used in industrial sequential control. The SFC method can describe the system’s 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 working 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 bination of these working steps. The system program has been debugged pletely 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 longdistance monitor and control the elevator in control center, to connect the elevator system with intelligence building industry management system by Ether or specialpurpose work 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 control system Lift control system is used to manipulate each control process by managing such mands 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 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 towards and plete programmed control objective through electrical automatic system based on mand. 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 puter control, multipleputer control. Prevailing in different era, these control modes are still employed in lifts now due to massive integrated circuit and puter technology development. PLC control system As abbreviation of programmable logic controller, PLC is an electronic system featuring digital putation. It adopts programmable EPROM to execute logic putation, order control, timing, number counting, arithmetic putation, besides, it can input and output through digital or analogy modes. The mechanism of PLC control is as follows: input of PLC includes such mand signals, as power key to home landing, car call, landing call, various safety switches, position signal, while output of PLC includes contactor, relay, indicators of car / landings and munication , indicators inside car and switch, position signal, are input to PC, while other executing Programming principle is determined by 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 pletely separating from relay control circuit. Based on the ready made control circuit, the former is simple and easy to master, 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, userfriendliness, convenient maintenance amp。 inspection. Nowadays, there is a wide range and series of programmable logic controllers. Input / output points range from 30 to 8000 or above, so as to meet lift control requirements with different landing number.