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1、Application of PLC in the Elevator Control System of Intelligence Building Li Fenglian1 Ren Qinglian2 1 TaiYuan University of Technology,Taiyuan, China, 2 TaiYuan University of science and Technology, Taiyuan, Chin

2、a, Phone(086)351-6150064 E-mail:ghLLfL@163.com Abstract: The paper mainly discusses one subsystem of intelligence building system: the elevator control system. The PLC strong ability in interference and so on makes th

3、e 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

4、 reduces the breakdown rate and efficiently improves the operating reliability of the elevator with safety .The structure of system is also simple and tightly packed.The working principle of the elevator control system i

5、s: The spot control information is send into the P L C 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 dem

6、ands. The elevator can then proceed the homologous action according to the control request .The paper selectsOM R O N company’s C 200HE series PLC, introducing parts of signal hookup of the elevator control system and

7、explaining the function of the control cabinet. Lastly the automation programming is introduced. Simulated experiments enunciates that the design method is viable. It can make the personnel of the industry management cen

8、ter to long-distance monitor and control the elevator in control center, to connect the elevator control system with intelligence building industry management system by Ethernet or special-purpose network such as Lon Wor

9、ks.The elevator working state can also be timely watched.These not only can realize scientific centralized management of the elevator, but also can lower the elevator maintenance cost etc. It is one of the dev

10、eloping direction of intelligence building elevator control system. Keywords: PLC; intelligence building; elevator control system; working principle; program design Ⅰ. Introduction In 1980s The first intelligence mansio

11、n had been completed in America, then intelligence building has been abroadly taken attentions by the whole world.The concept of intelligence building has been put different meanings along with the development of society

12、. The early stage intelligence building had been thought that it is equal to the intelligent mansion, but now the intelligence building not only includes the intelligence mansions but also involves intelligence residenti

13、al 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

14、 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 necessar

15、y 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 contro

16、l 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 on

17、e after another to apply the PLC to the 1625 signal lines were separately sent to each floor junction boxes to form elevator’s executive circuitry. Fig.2 Part of elevator control system signal hookups Fig. 3 A subprogr

18、am SFC: the calling from the third floor as elevator in the first floor Ⅳ. Program design The design includes two parts: hardware and software.The hardware design is the base of software. Considering that the control dem

19、ands 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 o

20、ther demands; When the elevator is descending, the descending demands are prior to other demands. The Sequential Function Chart (SFC) is adopted during the design. It is a method specially used in industrial sequential c

21、ontrol. The SFC method can describe the system’s working procedure in great detail. For example there is a three layers intelligence building. A subprogram, the calling from the third floor as elevator in the first floor

22、, is shown in Fig. 3 with SFC. 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 wo

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