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Overview of I/O Memory Area
4-1
Overview of I/O Memory Area
4-1-1
I/O Memory Area
Area
CIO
I/O Area
Input
272 bits
Area
Area
(17 words)
Output
272 bits
Area
(17 words)
Built-in ana-
Built-in
4 words
log I/O
Analog
Areas
Input
(XA CPU
Area
Units only)
Built-in
2 words
Analog
Output
Area
Data Link Area
3,200 bits
(200
words)
CPU Bus Unit Area
6,400 bits
(400
words)
Special I/O Unit Area
15,360
bits (960
words)
Serial PLC Link Area
1,440 bits
(90 words)
DeviceNet Area
9,600 bits
(600
words)
Work Area
4,800 bits
(300
words)
37,504
bits (2344
words)
Work Area
8,192 bits
(512
words)
Holding Area
8,192 bits
(512
words)
Auxiliary Area
15,360
bits (960
words)
142
This region of memory contains the data areas that can be accessed as
instruction operands. I/O memory includes the CIO Area, Work Area, Holding
Area, Auxiliary Area, DM Area, Timer Area, Counter Area, Task Flag Area,
Data Registers, Index Registers, Condition Flag Area, and Clock Pulse Area.
Size
Range
Task usage
CIO 0 to
Shared by
CIO 16
all tasks
CIO 100
to CIO
116
CIO 200
to CIO
203
CIO 210
to 211
CIO 1000
to CIO
1199
CIO 1500
to CIO
1899
CIO 2000
to CIO
2959
CIO 3100
to CIO
3189
CIO 3200
to CIO
3799
CIO 1200
to CIO
1499 CIO
3800 to
CIO 6143
W000 to
W511
H000 to
H511
(Note 1)
A000 to
A959
Instruction
Allocation
Bit
Word
access
access
CP1H CPU
OK
OK
Units and
CP-series
OK
OK
Expansion
Units or
Expansion I/O
Units
Built-in analog
OK
OK
input terminals
Built-in analog
OK
OK
output termi-
nals
Data Links
OK
OK
CPU Bus
OK
OK
Units
Special I/O
OK
OK
Units
Serial PLC
OK
OK
Links
DeviceNet
OK
OK
Masters using
fixed alloca-
tions
---
OK
OK
---
OK
OK
---
OK
OK
---
OK
---
Section 4-1
I/O Memory
Access
Change
from CX-
Read
Write
Programmer
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
Read-
Read-only:
only:
A000 to
A000 to
A447
A447
Read/
Read/write:
write:A44
A448 to
8 to A959
A959
Forcing
bit
status
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
No
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