370
I/O Memory Areas Section 9-2
Note 1. The I/O Area can be expanded to CIO 0000 to CIO 0999 by changing the
first words allocated to Racks.
2. Bits can be manipulated using TST(350), TSTN(351), SETB(532),
RSTB(533), OUTB(534).
3. Index registers and data registers can be used either individually by task
or they can be shared by all the tasks (CJ1-H and CJ1M CPU Units only).
4. Timer PVs can be refreshed indirectly by forced setting/resetting Timer
Completion Flags.
5. Counter PVs can be refreshed indirectly by forced setting/resetting
Counter Completion Flags.
6. CJ1-H and CJ1 CPU Units only.
7. The Function Block Holding Area words are allocated from H512 to H1535.
These words can be used only for the function block instance area (inter-
nally allocated variable area).
8. If the I/O Memory Hold Flag (A50012) is turned ON, the memory values
will be maintained when the operating mode is changed. If, in addition, the
PLC Setup is set to hold the status of the I/O Memory Hold Flag at startup
(IOM Hold Bit parameter), the memory values will be maintained when the
power supply is turned ON.
Work Area 8,192
bits (512
words)
W000 to
W511
Shared
by all
tasks
--- OK OK OK OK OK Cleared OK
Holding Area
(Note 7.)
8,192
bits (512
words)
H000 to
H511
--- OK OK OK OK OK Main-
tained
OK
Auxiliary Area 15,360
bits (960
words)
A000 to
A959
--- OK OK OK A000 to
A447 No
A000 to
A447 No
Varies
from
address
to
address.
No
A448 to
A959 OK
A448 to
A959 OK
TR Area 16 bits TR0 to
TR15
--- OK --- OK OK No Cleared No
DM Area 32,768
words
D00000
to
D32767
--- No
(Note 2.)
OK OK OK OK Main-
tained
No
EM Area (Note 6.) 32,768
words
per bank
(0 to C
max.)
E0_0000
0 to
EC_3276
7
--- No
(Note 2.)
OK OK OK OK Main-
tained
No
Timer Completion
Flags
4,096
bits
T0000 to
T4095
--- OK --- OK OK OK Cleared OK
Counter Comple-
tion Flags
4,096
bits
C0000 to
C4095
--- OK --- OK OK OK Main-
tained
OK
Timer PVs 4,096
words
T0000 to
T4095
--- --- OK OK OK OK Cleared No
(Note
4.)
Counter PVs 4,096
words
C0000 to
C4095
--- --- OKOKOKOKMain-
tained
No
(Note
5.)
Task Flag Area 32 bits TK00 to
TK31
--- OK --- OK No No Cleared No
Index Registers
(Note 3.)
16 regis-
ters
IR0 to
IR15
Used
sepa-
rately in
each
task
--- OK OK Indirect
address
-ing only
Specific
instruc-
tions
only
No Cleared No
Data Registers
(Note 3.)
16 regis-
ters
DR0 to
DR15
--- No OK OK OK No Cleared No
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
To Next Page
Loading...
