4-1SectionIR Word Allocation
33
The
CPU Rack begins with word 000 at the leftmost slot. The first Expansion
I/O
Rack
begins with
word 010, and the second Expansion I/O Rack with word 020.
The
first word of each Rack is fixed, regardless of the model of Backplane used.
As
with the I/O bits unused by individual I/O Units, the bits of the I/O words un
-
used by a Backplane can be used as work bits. The following figure
shows
the
relationship between the model of Backplane and I/O words. The shaded bits
can only be used as work bits.
000
005
001 002 003 004 006 007 008 009
00
15
00
15
00
15
00
15
00
15
00
15
00
15
00
15
00
15
00
15
000
005
001 002 003 004 006 007 008 009
00
15
00
15
00
15
00
15
00
15
00
15
00
15
00
15
00
15
00
15
000
005
001 002 003 004 006 007 008 009
00
15
00
15
00
15
00
15
00
15
00
15
00
15
00
15
00
15
00
15
C200H-BC031 Backplane
C200H-BC051-V1 Backplane
C200H-BC081-V1 Backplane
Word
bits
Word
bits
Word
bits
Note The C200H-OC225/OD212/OD21A 16-point Output Unit and C200H-B7AO1
B7A
Interface Unit can be mounted only to a C200H-BC
1-V1/V2 Backplane.
For example, if a PC consists of three 8-slot Racks with 8-point I/O Units
mounted
to all I/O Unit mounting positions, the number of I/O points for the entire
PC will be:
8 points x 8 slots x 3 Racks = 192 points
If
a PC consists of three 8-slot Racks with the I/O Unit mounting positions equally
divided
between 16-point Input Units and 12-point Output Units,
the number of
I/O points for the entire PC will be:
Input points = 16 points x 4 slots x 3 Racks = 192 points
Output points = 12 points x 4 slots x 3 Racks = 144 points
Total I/O points = 192 + 144 = 336
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