Remote I/O - Omron SYSMAC C200H Installation Manual

Remote I/O

4-2 Remote I/O
34
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The following figure shows the word allocation for a fully expanded C200H with
three 8-slot Backplanes.
word word word
000 001 002
word word word
010 011 012
word word word
020 021 022
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
A High-speed Counter, Position Control
(NC111/NC112), ASCII, Analog I/O, ID Sensor,
Fuzzy Logic Unit
B High-density and Mixed I/O, Cam Positioner,
Temperature Control, PID Control, Heat/Cool
Temperature Control
C Temperature Sensor, Voice
D Position Control (NC221)
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
A + B + C + D 8
word word word word
003 004 005 006
word
word word word
015
013 014 016
word
word word word
025
023 024 026
Units
12
Section 4-2
word CPU
007
word Power
017 Supply
word
Power
027
Supply
Total number
4 Units
8 Units
6 Units
2 Units