【正文】 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. For example there is a three layers intelligence building. A subprogram, the calling from the third floor as elevator in the first floor, 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 working bits to remember working steps. We should write out the working bits control program, which can link together each step and make the previous step as the next step restriction condition. Thus the actual outputs are the logic bination of these working steps. Ⅴ. Conclusion 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 control system with intelligence building industry management system by Ethernet or specialpurpose network such as Lon Works. 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 costs etc. It is one of the developing direction of intelligence building elevator control PLC still has the function that the high class counts the machine, being us while accept some datas of high speed, the high speed that here say is the data of the in all aspects tiny second class, for example the bar code scanner is scanning the data continuously, calculating highspeed signal of the data processor DSP etc., we will adopt the high class to count the machine to help we carry on count. It at the PLC carries out the procedure once discover that the high class counts the machine to should of interruption, will let go of the work on the hand immediately. The trapezoid diagram procedure that passes by to weave the distance again explains the high class for us to carry out procedure to count machine would automatic performance to should of work, thus rise the Class that the high class counts the machine to high one Class. The PLC development has already entered for network ages of correspondence from the mode of the one, and together other works control the net plank and I/ O card planks to carry on the share easily. A state software can pass all se hardwares link, more animation picture of keep the view to carries on the control, and cans pass the Internet to carry on the control in the foreign land, the blastoff that is like the absolute being boat is to adopt this kind of way to make airship go up the sky.The development of the higher layer needs our continuous effort to PLC emergence has already affected a few persons fully, we also obtained more knowledge and precepts from the top one experience of the generation, ing to the continuous development PLC。(4) PLC can be automated fault detection and alarm display to improve the operation of security and ease of maintenance. (2) layer was removed and a majority of the relay, the control system structure is simple, to simplify the external circuit. t satisfied with the current manufacturing industry foreground, also can39。 program design Ⅰ. Introduction In 1980s The first intelligence mansion had been pleted in America, then intelligence building has been abroadly taken attentions by the whole 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 intelligent 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 elevator supervising and control system is also necessary to the intelligence residential to make people feel safe ,stable and fortable and how to save energy resources and protect environments and so on are the basic requirements to the elevator control system. PLC is a mon industry control is a special industry control puter 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. Along with the development of the ages, the technique that is nowadays is also gradually perfect, the petition plays more more strong。 elevator control system。還有我的兄長們在我成長期間一如既往地給我極大的關(guān)心與鼓舞，在此真誠感謝他們！最后，再次向所有幫助過我，激勵過我，關(guān)心過我的人，致以最誠摯的謝意和最美好的祝福！外文翻譯Application of PLC in the Elevator Control System of Intelligence Building Abstract: trial automation contThe paper mainly discusses one subsystem of intelligence building system: the elevator control system. The PLC strong ability in interference and so