ABSTRACT
In the modern society, the rapid development of the brokerag
e, high-rise buildings, increasingly, high—rise buildings, floors
high, dozens of layer is only stairs have been unable to meet the
demand of people, the emergence of the elevator solved this d
ifficult problem, therefore, the development of the elevator has
also become a kind of trend, for elevator control more
and more high, favored by people, became a high-rise building col
umns in the bus. People living well, also to the requirement of safety
and comfort of life is higher, so the elevator in later development,
also with the development of this trend。 About how to att
ain the passenger elevator, safe and comfortable this p
roblem, the elevator control requirements in the moto
r speed and control precision and speed range and so on, puts
forward the more strict control requirements in each aspect。 Als
o was born, with the development of industrial demand, PLC contro
l using PLC, provided the development direction of wider. PLC for
industry, along with its development, its volume is more and m
ore small, function also more and more perfect, the control
effect is more stable, can reduce the influence of interference
on the. With the mechanical and electrical components, the func
tion of integrated in a system. Therefore, PLC for the
development of the elevator, has become the key technology of its operation
Keywords: elevator, PLC, relay