Design And Implementation Of The Elevator Control System Based On Plc

PLC (Programmable Logical Controller) took one kind most important, the application situation industrial-controlled microcomputer, it is convenient, operation simple in particular by its programming merit and so on.Its redundant reliability, obtained the widespread application in the industrial production process. It applies the large-scale integrated circuit, the miniature machine technology and the communication technology development achievement.And gradually formed many kinds of merits.Along with society's unceasing development, the buildings are higher and higher, the elevators became the uncessary equipments for high level buildings. After humanity's more than centuries unremitting endeavors, the elevators has already developed the group control elevator instead of switch operation elevator by the handle or button.This has made the indelible contribution.The applications of PLC mainly manifested by its logical switch control function. This function enables PLC to have the logic operation, counts with fixed time as well as the data in-and-put function. During the control of elevators,all kinds of logical switch control and PLC's working together realizes the good results of controlling.The dissertation introduces the use of PLC in the elevator controlling system. A PLC control system for a four-story elevator was designed as an example to describe how to estimate the number of the I/0 points and distribute them, how to choose a PLC,plan the movement of the elevator, draw a ladder diagram in details. It was certified that the elevator with the PLC control system has all the functions expected. Such as: selecting the directions and making the door switch automatically, automatic landing, call memory etc.