-
(
文档含英文原文和中文翻译
)
中英文对照外文翻译文献
Application of PLC in the
Elevator Control System of
Intelligence
Building
Abstract: The
paper mainly discusses one subsystem of
intelligence building system:
the
elevator control system. The PLC strong ability in
interference and so on makes
the
elevator industry one after another to apply the
PLC to the elevator control system
in
order
to
replace
the
relay
being
used
in
traditional
elevator
control
system.
The
Application
of
PLC
in
the
Elevator
control
system
reduces
the
breakdown
rate
and
efficiently improves the
operating reliability of the elevator with safety
.The structure
of
system
is
also
simple
and
tightly
working
principle
of
the
elevator
control
system
is:
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 proceed the
homologous action according to the control request
.The paper
selects
ＯＭＲＯＮ
company’s
Ｃ
200HE
series
PLC,
introducing
parts
of
signal
hookup
of
the
elevator
control
system
and
explaining
the
function
of
the
control
cabinet.
Lastly
the
automation
programming
is
introduced.
Simulated
experiments
enunciates that
the design method is viable. It can make the
personnel of the industry
management
center to long-distance monitor and control the
elevator in control center,
to connect
the elevator control system with intelligence
building industry management
system
by
Ethernet
or
special-purpose
network
such
as
Lon
elevator
working
state
can
also
be
timely
not
only
can
realize
scientific
centralized management of the elevator,
but also can lower the elevator maintenance
cost etc. It is one of the developing
direction of intelligence building elevator
control
system.
Keywords:
PLC;
intelligence
building;
elevator
control
system;
working
principle;
program design
Ⅰ
. Introduction
In
1980s
The
first
intelligence
mansion
had
been
completed
in
America,
then
intelligence
building
has
been
abroadly
taken
attentions
by
the
whole
concept
of
intelligence
building
has
been
put
different
meanings
along
with
the
development of society. The early stage
intelligence building had been thought that it
is equal to the intelligent mansion,
but now the intelligence building not only
includes
the
intelligence
mansions
but
also
involves
intelligence
residential
districts.
This
paper
mainly
discusses
one
subsystem
of
intelligence
building
system:
the
elevator
control system.
In
intelligence
residential
districts
the
enterprise’s
information
managing
system mainly takes charge of the
things which related to the daily life, for
example
supervising
the
district
equipments,
managing
vehicles,
disposing
critical
situations
and
so
elevator
supervising
and
control
system
is
also
necessary
to
the
intelligence residential to make
people feel safe ,stable and comfortable
and how to save energy resources and
protect environments and so on
are the
basic
requirements to the elevator
control system.
PLC
is
a
common
industry
control
is
a
special
industry
control
computer which has the perfect function
and simple frame. The PLC strong ability in
interference and so on makes the
elevator industry one after another to apply the
PLC
to the elevator control system, in
order to replace the relay being used in
traditional
elevator
control
system.
The
Application
of
PLC
in
the
elevator
control
system
reduces
the
breakdown
rate
and
efficiently
improves
the
operating
reliability
of
the
elevator
with
safety.
This
paper
mainly
discusses
the
elevator
control
system’s
working
principles,
the
system’s
software
and
hardware
realization
methods
and
so
on.
Ⅱ
. The Working
Principle of Elevator Control System
In
Fig.
1
the
Hardware
Structure
Graph
of
Elevator
Control
System
is
presented.
Fig. 1 The Hardware Structure Graph of
Elevator Control System
The
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
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
transduce
rs for the purpose of
electrical motor’s
positive turn and
reverse ,stop and control each segment velocity
and so on .
ＯＭＲＯ
Ｎ
company’s
Ｃ
200HE
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
.
Ｃ
200HE
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 Fig.2.
The
control
cabinet
is
the
control
center,
from
which
we
can
send
out
various
control commands.
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 junction
Ⅳ
. Program design
The design includes two
parts: hardware and hardware design is the
base
of
software.
Considering
that
the
control
demands
are
relatively
complex,
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 demands; When the elevator is descending,
the descending
demands are prior to
other demands. The Sequential Function Chart (SFC)
is adopted
during the
boxes
to form elevator’s executive circuitry
design. It is a method specially
used
in
industrial
sequential
control.
The
SFC
method
can
describe
the
system’s
working
procedure
in
great
detail.
For
example
there
is
a
three
layers
intelligence
building. A
subprogram, the calling from the third floor as
elevator in the first floor, is
shown
in Fig. 3 with SFC.