PLC四层电梯教学系统外文资料

外文资料翻译 A Application of PLC in the Elevator Control System of Intelligence Building In 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 meanings 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 discusses one subsystem of intelligence building system the elevator control system In intelligence residential districts the enterprise s information managing system mainly takes charge of the things which related to the daily life for example supervising the district equipments managing vehicles disposing 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 elevator 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 order 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 system s working principles the system s 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 control 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 installed in the tail of tow motors So this is a feedback control system which can improve the system s control precision It is not necessary to do interface circuit in the elevator s PLC control system What we should do is to send the signals to PLC digital input terminals The signals include inside 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 purpose of electrical motor s 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 system s major control device The control cabinet is the control center from which we can send out various control 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 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 cabinet 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 complex 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 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 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 combination of these working steps The system program has been debugged 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 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 control system Lift 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 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 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 computer 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 system As abbreviation of programmable logic controller PLC is an electronic system featuring digital computation It adopts 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 car 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 com 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 completely 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 user friendliness convenient maintenance 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 译 文 PLC 在智能建筑电梯控制系统中的应用 在 20 世纪 80 年代 第一座智能大厦在美国竣工 之后智能建筑引起了全世界的关注 随着社会 的发展 智能建筑有着不同的含义 早期智能建筑被认为是等同于智能大厦 但是现在智能建筑不仅 涉及智能大厦 而且还涉及智能住宅小区 本文主要讨论了智能建筑系统的一个子系统 电梯控制系 统 智能住宅区内企业的信息管理系统主要是负责涉及到日常生活的事物 例如监管住宅区内的设备 车辆 处理紧急情况等等 电梯的监管可控制系统对智能住宅区来说也是必须的 如何使人们感到安 全 稳定和舒适 以及如何节约能源资源和保护环境等是电梯控制系统的基本要求 Plc 可编程控制器是一种常见的工业控制设备 是一种特殊的工业控制计算机 具有完善的功能 和简单的框架 PLC 具有强抗干扰能力等优点 使得电梯工业一次又一次将 PLC 应用与电梯控制系统 以取代传统的使用继电器控制电梯系统 PLC 在电梯控制系统应用 减低了故障率 并有效地提高了 电梯运行的可靠性与安全性 本文主要论述了电梯控制系统的工作原理 系统的软件和硬件实现方法 等 电梯控制系统工作原理说明如下 首先将使用者现场的输入信息发送到 plc 中 然后 plc 控制装 置通过系统要求发出信号以驱动外围设备 然后电梯根据控制要求执行相应的动作 系统中的速度反 馈装置 采用的是测速装置测出电梯运行速度反馈控制装置 通常安装在曳引电动机的后面 所以该 系统是一个反馈控制系统 可提高系统的控制精度 电梯的 PLC 控制系统的接口电路不需要设计 我们要做的是将信号 包括梯内外召唤信号 平层 监测信号 开门和关门信号等发送个 plc 的数字输入端口 Plc 中的直流电源 提供给指示灯 Plc 的 输出点直接控制传感器 以达到电动机正传和反转 停机的目的 此为 电梯控制系统中除了 plc 和主要控制装置外还包括其它的输入和输出装置 控制柜是整个控制系统的核心部分 可以发送各种控制命令 通常安装在电梯室内 电气设备和 信号装置 例如 接触器 继电器 电容 电阻 整流器和变压器等 也都安装在控制柜内 控制柜 中的电源是由电梯室内的主电源提供 电梯室内的主电源还通过由软电缆做成的导线连接到各个控制 按钮 电动机也是由它供电 控制线和信号线分别接至各个楼层 设计包括两个部分 硬件和软件 硬件设计是软件设计的基础 考虑到控制的要求相对复杂 我 们按照控制功能将程序分块 此外电梯还必须遵循以下调度原则 当电梯上行时 任何反方向即下降 的按钮呼梯均无效 当电梯下行途中 任何上升的按钮呼梯均无效 顺序功能图 SFC 在设计过程中被 采用 它广泛应用于工业顺序控制 顺序功能图 SFC 能够详细 直观的描述系统的工作过程 当所有的顺序功能图都设计完 I O 地址分配好 我们可以将顺序功能图 SFC 转化成符号梯形图 LD 考虑到严格的定时时间和互锁 我们采用步来代表工作步骤 我们应当写出各步的控制程序 通过限制条件来控制下一步的运行 结束上一步 这样就可以将各个步连接在一起 因此 实际输出 是这些步的逻辑组合