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I/O Memory Appendix B
I/O Memory Structure
Coordinator Module
The following table shows the basic structure of the I/O Memory for the Coordinator Module.
Note When data is written from the CX-Programmer or a host controller, these DM Area words are backed up
in flash memory. The contents of flash memory is read out each time the power is turned ON.
Area Size Range Task
usage
External
I/O allo-
cation
Bit
access
Word
access
Access Change
from
CX-Pro-
gram-
mer
Status
at
power
ON
Status
at
mode
change
Forc-
ing
bit
sta-
tus
Read Write
CIO
Area
I/O Area 24 bits
(2
words)
CIO 0000
to
CIO 0001
Shared
by all
tasks
OK
Coordi-
nator
Module
OK OK OK OK OK Cleared Cleared OK
Serial PLC
Link Area
320 bits
(20
words)
CIO 0080
to
CIO 0099
--- OK OK OK OK OK OK
Cyclic
Refresh Bit
Area
600 bits
(40
words)
CIO 0100
to
CIO 0139
--- OK OK OK OK OK OK
Synchro-
nous Data
Link Bit
Area
320 bits
(20
words)
CIO 0200
to
CIO 0219
--- OK OK OK OK OK OK
Internal I/O
Areas
2,784
bits
(174
words)
CIO 0002
to
CIO 0079
CIO 0140
to
CIO 0199
CIO 0220
to
CIO 0255
--- OK OK OK OK OK OK
Work Area 4,096
bits (256
words)
W000 to
W255
--- OK OK OK OK OK Cleared Cleared OK
Auxiliary Area 10,400
bits (650
words)
A000 to
A649
--- OK OK OK OK OK Cleared Main-
tained
No
TR Area 16 bits TR0 to
TR15
--- OK --- OK OK No Cleared Cleared No
DM Area 30,000
words
D00000
to
D29999
--- No OK OK OK OK Cleared Main-
tained
No
2,768
words
D30000
to
D32767
--- No OK OK OK OK Main-
tained
(See
note.)
Main-
tained
No
Timer Area 256
words
T0000 to
T0255
--- OK --- OK OK OK Cleared Cleared OK
Counter Area 256
words
C0000 to
C0255
--- OK --- OK OK OK Cleared Main-
tained
OK