【文章內(nèi)容簡介】 bee one of the important transportation equipment. The design mainly PLC (PLC) and puter application to the elevator control system, and to fivestory elevator as an example to plete a single lift PLC program control system design, position and modular program design . Mitsubishi FX2N through puter munications and to achieve operation of the elevator control system PLC (programmable controller) takes one industrial control microputer, it is convenient by its programming, simplicity of operator its merits and so on high controllability, obtained the widespread application particularly in the industrial production process. It applies the large scale integrated circuit, the miniature machine technology and the mechanics of munication development achievement, formed gradually had many kinds of merits and miniature, medium, largescale, the ultralarge type and so on each kind of specification39。s serial products, applied to monitors between puter39。s many control domain from the blackwhite control system. Along with society39。s unceasing development, the building is getting higher and higher, but the elevator became the highlevel building to the equipment. The elevator from the handle switch operation elevator, the pushbutton control elevator develops to present39。s group control elevator, has made the indelible contribution for the highlevel transportation. PLC mainly manifests in the elevator cuing control39。s application in its logical switch control function. Because PLC has the logic operation, counting and fixed time as well as data feeds output function. In the elevator rises and falls in the process, each logical switch control and the PLC very good union, very good have realized to the fluctuation the control. This article main discussion studies uses Simens in the S7200 PLC to carry on the control to elevator39。s fluctuation, forms the lift control system. PLC Introduction Programmable controller is the first in the late 1960s in the United States, then called Plc programmable logic controller (ProgrammableLogicController) is used to replace relays. For the implementation of the logical judgement, timing, sequence number, and other control functions. The concept is presented Plc General Motors Corporation. Plc and the basic design is the puter functional improvements, flexible, generic and other advantages and relay control system simple and easy to operate, such as the advantages of cheap prices bined controller hardware is standard and overall. According to the practical application of target software in order to control the content of the user procedures memory controller, the controller and connecting the accused convenient target. In the mid1970s, the Plc has been widely used as a central processing unit microprocessor, import export module and the external circuits are used, largescale integrated circuits even when the Plc is no longer the only logical (IC) judgement functions also have data processing, PID conditioning and data munications functions. International Electrotechnical Commission (IEC) standards promulgated programmable controller for programmable controller draft made the following definition : programmable controller is a digital electronic puters operating system, specifically for applications in the industrial design environment. It used programmable memory, used to implement logic in their internal storage operations, sequence control, timing, counting and arithmetic operations, such as operating instructions, and through digital and analog input and output, the control of various types of machinery or production processes. Programmable controller and related peripherals, and industrial control systems easily linked to form a whole, to expand its functional design. Programmable controller for the user, is a noncontact equipment, the procedures can be changed to change production processes. The programmable controller has bee a powerful tool for factory automation, widely popular replication. Programmable controller is useroriented industries dedicated control puter, with many distinctive features. First, high reliability, antiinterference capability。 Second programming visual, simple。 Third, adaptability good。 ④ functional improvements, strong functional interface PLC language is not we imagine of edit collected materials the language or language of Cs to cany on weaving the distance, but The PLC biggest characteristics lie in: The electrical engineering teacher already no longer electric hardware up too many calculationses of cost, as long as order the importation that the button switch or the importation of the sensors order to link the PLC up can solve problem, pass to output to order the conjunction contact machine or control the start equipments of the big power after the electric appliances,butthe exportation equipments direct conjuuctiou of the small power can. PLC internal containment have the