PLC物料自动分拣系统毕业设计外文文献翻译文档格式.doc
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Jannotta说的：
“
将在硬件销售中不成比例。
当然每个
供应商将试图保护这一点。
出于这个原因，他说，PLC
的制造商将不会开始销售其他厂商的通用
。
“如果我们开始销售那种产品，那我们还有什么可生产的？
Jannotta
说道
随着更多智能
出现，Sal
Provanzano
认为在不同的制造商中间这将导致更多的分化。
“当
变得非常只能，并成为系统的一部分，到底哪个是I/O,哪个是CPU真的很难定义。
如果你愿意，CPU
也同样可以纳入
的系统”
PLC的I/O和个人电脑的连接
虽然不同的
厂商可能会继续用专有的
I/O，但一些厂商使
连接到
IBM
PC
这样的兼容设备成为可能。
Alle
-
bradeley
和辛辛那提米拉克龙公司已经拥有，并有传言说，GE计划将沿着同样的思路。
Bill
Ketelhut,
北美的产品规划经理，认为是
的普及“我觉得多个主机接口将代替
”他说。
朱迪格洛尔，Square
D
自动化产业市场经理，将
看做是工业电脑。
PLC和个人电脑
如果
7552，行动仪器
BC22，和其他计算机出现在工厂，这难道不意味着对
的新竞争。
“有一些对于更有利于电脑的控制功能。
可编程程序控制器被迫适应的这些要求。
Ryan说。
然而，在我们调查的厂商多数不认为“个人电脑入侵”将对他们产生影响。
大多数人说，PLC和PC除架构之外，他们通常会做足够的控制。
他们认为PC会做PLC的工作紧紧是因为现在PLC
I/O模块能跟PC连接。
他们相信这只是意味着，PLC
和个人电脑将能够共享相同的数据。
富瑞恩说：
“通用的计算机和可编程控制器内在结构不同，硬件结构有内置到几乎每一个制造商的可编程控制器。
如今定制的硬件来运行梯形逻辑，解决机器代码。
”他引用的一个根本的区别称呼为“机器状态”
富瑞安说：
“当你关闭机器，或中断周期，或者跳转到另一个周期，可编程控制器本身记得机器的状态：
定时器状态是什么，计数器状态是什么，锁存的状态是什么,但计算机本身不这样做。
PLC
PLCs（programmablelogicalcontroller）faceevermorecomplexchallengesthese
days
.
Where
once
they
quietly
replaced
relays
and
gave
an
occasional
report
to
a
corporate
mainframe,
are
now
grouped
into
cells,
given
new
job
languages,
forced
compete
against
growing
array
of
control
products.
For
this
year'
s
annual
technology
update
we
queried
makers
on
these
topics
more
Programming
languages
Higher
level
programming
have
been
around
for
some
time
but
lately
their
popularity
has
mushrooming.
"
As
Raymond
Leveille,
vice
president
&
general
manager,
Siemens
Energy
Automation
.inc;
Programmable
controls
being
used
sophisticated
operations,
other
than
ladder
logic
become
practical,
efficient,
powerful.
example,
it'
very
difficult
write
trigonometric
function
using
."
Languages
gaining
acceptance
include
Boolean,
system
flowcharting,
such
chart
as
Graphcet
its
variation
.And
there'
increasing
interest
in
like
C
BASIC.
PLCs
process
Thus
far,
not
extensively
continuous
.Will
continue?
The
feeling
that
I'
ve
gotten,"
says
Ken
Jannotta,
manger,
product
planning,
series
One
Series
Six
at
North
America
'
is
will
be
the
industry
but
necessarily
control."
Several
vendors
-obviously
betting
opposite
happen
-have
introduced
optimized
application
.Rich
Ryan,
commercial
marketing,
Allen-bradley
Controls
Div.,
cites
PLCs'
use
industries
food
chemicals
and
petroleum.
Ryan
feels
there
two
types
applications
which
they'
re
appropriate.
one,"
he
says,"
where
size
that'
automated
doesn'
t
justify
DCS[distributed
system].With
starting
price
tags
chose
products
relatively
high,
programmable
controller
makes
sense
small,
low
loop
count
.The
second
you
integrate
closely
with
sequential
.Batch
controllers
prime
example
where
sequence
maintaining
theprocess
variable
intertwined
so
benefits
having
do
outweighs
disadvantages
distributed
system."
Barkovitz,
Triconex,
predicts
all
future
come
out
business
embrace
lot
functionality
ever
did
before
Communications
MAP
vital
individual
automation
cell
factory
whole.
We'
heard
about
last
few
years
companies
jumped
bandwagon.Many,
however,
were
disappointed
when
fully-defined
completed
specification
didn'
appear
immediately
.Says
Komarek:
Right
now,
still
moving
target
manufacturers,
final
.Presently,
example.
people
introducing
meet
MAP2.1standard
.Yet2.1-based
obsolete
standard
MAP3.0
introduced."
Because
this,
many
holding
off
full
implementations.
Omron,
ongoing
MAP-compatibility
program;
Frank
Newburn,
Omron'
Industrial
Division
reports
because
lack
firm
definition
Omron'
don'
yet
talk
MAP.
Since
unlikely
would
broad
anyway,
concentrating
proprietary
networks.
According
Sal
Provanzano,
users
fear
if
get
board
withdraw
from
MAP,
ll
ones
left
communications
structure
supported.
Universal
While
concerns
compatible
between
different
vendors,
connection
at
end-the
I/O-is
even
fragmented
.With
rare
exceptions,
.Yet
those
who
feel
eventually
universal
.GE
hoping
Genius
smart
line.
independent
pulling
same
direction.
Many
say
high-value
item
always
want
tokeep
it
.As
says:
going
disproportionate
amount
hardware
sale.
Certainly
each
vendor
try
protect
that.
reason,
says,
won'
begin
selling
vendor.
we
start
kind
product,
jannotta,
what
manufacture?
With
intelligent
appearing,
lead
differentiation
among
makers.
becomes
extremely
part
system,
really
hard
define
CPU.
It
CPU,
will,
equally
integrated
I/O."
Connecting
PCs
probably
continue
I/O,
several
make
possible
connect5
PC-compatible
equipment.
Alle-bradeley,
Could,
Cincinnati
Milacron
already
have,
rumor
planning
something
along
lines
.Bill
manage
sees
sort
thing
alternative
I
think
trend
instead
toward
multiple
host
interface
"
.Jodie
Glore
director
marking,
Square
Products,
Views
another
indication
are,
time,
industrial
computers.
If
7552,
Action
Instruments
BC22,and
computers
appearing
floor,
mean
competition
PLCs?
Ryan:
There
functions
better
jobs
fit
applications.
Yet,
majority
surveyed
invasion"
pose
problem
them
.Most
said
enough
apart
architecture
usually
control.
They
take
just
modules
can
connected
PCs;
believe
simply
means
able
share
data.
inherent
architectural
differences
purpose
computer,"
.There
constructs
built
almost
every
manufacture'
today
customize
run
solve
machine
code.
fundamental
difference
called
state
.Ryan:
When
shut
off,
or
interrupt
cycle,
jump
spot
inherently
remember
machine:
timers
were,
counters
what
states
latches
.Computers
that."
7
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