Abstract
With our country’s economy developing high speed,the microelectronics technology,computer technology of exchanging frequency conversion has already entered a brand-new times,and its application is more and more broad .furthermore,as the moderm high buildings’ perpendicular transportation,the elevation has close relation with people’s life,and with people requiring high quality about it,elevation has got great development.its dragging technology has already has already developed to The frequency modulation accent presses the velocity modulation,and PLC has already insteaded of the former Relay in logic control,on the basis of General frequency changer,this essay adopts PLC to control the elevator,and improve the controlling level of the elevator through rational choice and designation.meanwhile,it improves the comfortable sense of the running elevator.and makes elevator become easy to control.this essay mainly introduces the general designing plans,designing process and constitutes of four floors elevator’s PLC controlling system.it also lists the control trapezoid diagram of elevator.
Keywords :PLC ;elevator control; procedures designed ;ladder目 录