【正文】 版社 2008.1張有東,趙金憲 PLC材料自動分揀系統(tǒng)的研究 2002.1:機械工業(yè)出版社2007.1 1998.1張永飛,姜秀玲 : 大連理工大學(xué) 2005.1:電子工業(yè)出版社 2003.致 謝本設(shè)計是在蔣麗老師的悉心指導(dǎo)下完成的，設(shè)計從選題到寫作及最后的成稿，老師都給予了精心的指導(dǎo)和極大的幫助。這次畢業(yè)設(shè)計，老師給予我們許多幫助，同時也為我們指明了方向。我們了解到了做一個系統(tǒng)的基本常識，為我們以后從事技術(shù)工作打下良好的基礎(chǔ)。另外我們在設(shè)計的過程中還得到許多同學(xué)的幫助，對于良師益友的幫助，我深表感謝。父母十幾年寒心茹苦將我撫養(yǎng)成人，并以堅定的意志負(fù)擔(dān)起我求學(xué)的重?fù)?dān)，使我能安心學(xué)業(yè)，順利完成大學(xué)學(xué)習(xí)任務(wù)，實現(xiàn)兒時的夢想。 intelligence building。 working principle。 the operation that list depends the artificial has already can39。t guarantee the request of the higher quantity and high new the image of the technique business enterprise.Ⅱ. The Working Principle of Elevator Control System Elevator control system relays the failure rate high, greatly reduces the reliability and safety of elevators, and escalators stopped often to take with the staff about the inconvenience and fear. And the event rather than taking the lift or squat at the end of the lift will not only cause damage to mechanical ponents, but also personal accident may occur. Programmable Logic Controller (PLC) is the first order logic control in accordance with the needs of developed specifically for industrial environment applications to operate the electronic digital puting device. Given its advantages, at present, the relay control the lift has been gradually replaced by PLC control. At the same time, AC variable frequency motor speed control technology, the way the lift drag speed has been a gradual transition from DC to AC frequency converter. Thus, PLC control technology increases VVVF Elevator modern technology has bee a hot industry.1. PLC elevator control advantages (1) used in elevator control PLC, with software for automatic control of lift operation, reliability greatly increased. (3) PLC can be a variety of plex control system, easy to add or change control functions. (5) for the group control the allocation and management, and improve the efficiency of elevator operation. (6) do not need to change the control scheme changes when the hardware connection.In Fig. 1 the Hardware Structure Graph of Elevator Control System is presented.Fig. 1 The Hardware Structure Graph of Elevator Control SystemThe 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. Ⅲ. The Hardware Configuration of Control System Elevator control system relays the failure rate high, greatly reduces the reliability and safety of elevators, and escalators stopped often to take with the staff about the inconvenience and fear. And the event rather than taking the lift or squat at the end of the lift will not only cause damage to mechanical ponents, but also personal accident may occur. Programmable Logic Controller (PLC) is the first order logic control in accordance with the needs of developed specifically for industrial environment applications to operate the electronic digital puting device. Given its advantages, at present, the relay control the lift has been gradually replaced by PLC control. At the same time, AC variable frequency motor speed control technology, the way the lift drag speed has been a gradual transition from DC to AC frequency converter. Thus, PLC control technology increases VVVF Elevator modern technology has bee a hot industry. It is not necessary to do interface circuit in the elevator’s PLC control we should do is to send the signals to PLC digital input 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 .ＯＭＲＯＮ pany’s Ｃ200HE series PLC has been selected as major control configuration according to the input/output points and the length of user’s program. On the other hand we also consider that the system’s function can be expanded in the future .Ｃ200HE series PLC ,whose perfect function and strong reliability, can meet these demands at present. Moreover, input and output devices are needed in elevator control system, besides the PLC, system’s major control device. Part of signal hookups of the elevator electric control system is shown in . The control cabinet is the control center, from which we can send out various control mands. 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 junctionⅣ. Program design The design includes two parts: hardware and 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 demand