Omron CJ - 08-2008 - I;O Memory Area Structure; I;O Memory Areas

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I/O Memory Areas Section 9-2
9-2 I/O Memory Areas
9-2-1 I/O Memory Area Structure
The following table shows the basic structure of the I/O Memory Area.
Area Size Range Task
usage
External
I/O alloca-
tion
Bit
access
Word
access
Access Change
from
Pro-
gram-
ming
Device
Status at
startup
or mode
change
Forc-
ing
bit
sta-
tus
Read Write
CIO
Area
I/O Area 1,280
bits (80
words)
CIO 0000
to
CIO 0079
(Note 1)
Shared
by all
tasks
Basic I/O
Units
OK OK OK OK OK Cleared
(See
note 8.)
OK
Data Link
Area
3,200
bits (200
words)
CIO 1000
to
CIO 1199
Data link OK OK OK OK OK OK
CPU Bus
Unit Area
6,400
bits (400
words)
CIO 1500
to
CIO 1899
CPU Bus
Units
OK OK OK OK OK OK
Special I/O
Unit Area
15,360
bits (960
words)
CIO 2000
to
CIO 2959
Special I/O
Units
OK OK OK OK OK OK
Built-in I/O
Area (CJ1M
CPU Units
with built-in
I/O only.)
10 bits +
6 bits (1
word + 1
word)
CIO 2960
to
CIO 2961
Built-in I/O
port
OK OK OK OK OK OK
Serial PLC
Link Area
(CJ1M CPU
Units only.)
1,440
bits (90
words)
CIO 3100
to
CIO 3189
Serial PLC
Link
OK OK OK OK OK OK
DeviceNet
Area
9,600
bits (600
words)
CIO 3200
to
CIO 3799
DeviceNet
Master
(fixed allo-
cations
OK OK OK OK OK OK
Internal I/O
Areas
37,504
bits
(2,344
words)
4,800
bits (300
words)
CIO 1200
to
CIO 1499
CIO 3800
to
CIO 6143
--- OK OK OK OK OK OK