4-2SectionRemote I/O
34
The
following figure shows the word allocation for a fully expanded C200H with
three 8-slot Backplanes.
word
000
word
005
word
001
word
002
word
003
word
004
word
006
word
007
CPU
word
010
word
015
word
011
word
012
word
013
word
014
word
016
word
017
word
020
Power
Supply
word
025
word
021
word
022
word
023
word
024
word
026
word
027
Power
Supply
4-2 Remote
I/O
There
are limits to how long the normal wiring between the PC and its Expansion
I/O Racks can be. A Remote I/O Unit can extend
this
distance greatly
, so that the
PC and its Expansion I/O Racks can even be located in separate buildings.
There are two types of Remote I/O Systems, optical and wired.
By
locating a Rack farther from the CPU Rack, a Remote
I/O System eliminates
the
time and mess in wiring (or changing wiring) to many devices that are
sepa
-
rated
from the CPU Rack. Although all I/O points must ultimately be wired indi
-
vidually,
the question is one of distance: Do you want to wire dozens of terminals
all
the way across a factory complex or do
you want to run a single cable for most
of
the distance and then wire individual terminals locally? A PC with an Expan
-
sion I/O System is called an Expanded PC.
I/O
words 100
through 199 and DM words 1000 through 1999 are allocated to
Special
I/O Units. There are limitations to the number and model of Special I/O
Units
that can be mounted to a Remote I/O Slave Rack. Provided no other mod
-
els
of Special I/O Units are mounted to
a Remote I/O Slave Rack, the maximum
number
of Special I/O Units that can be mounted is shown below for each
model.
Group Units Total number
A High-speed Counter, Position Control
(NC111/NC112), ASCII, Analog I/O, ID Sensor,
Fuzzy Logic Unit
4 Units
B High-density and Mixed I/O, Cam Positioner,
Temperature Control, PID Control, Heat/Cool
Temperature Control
8 Units
C Temperature Sensor, Voice 6 Units
D Position Control (NC221) 2 Units
When
using a combination of A, B, C, and D Units on a Remote I/O Slave Rack,
the
number of each model of Unit being used must satisfy the following two for
-
mulas.
3A + B + C + 6D 12
A + B + C + D
8
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