524
Memory Areas
Appendix C
Note
1.
IR and LR bits that are not used for their allocated functions can be used as work bits.
2.
A minimum 2,528 bits are available as work bits. Other bits can be used as work bits when they are
not used for their allocated functions, so the total number of available work bits depends on the con-
figuration of the PC.
3.
When accessing a PV, TIM/CNT numbers are used as word data; when accessing Completion Flags,
they are used as bit data.
Inner Board slot 2 area
192 bits IR 232 to
IR 243
IR 23200 to
IR 24315
These bits are allocated to the Inner Board mounted in slot 2
of the CQM1H-CPU51/61. (Can be used as work bits when
the CQM1H-CPU11/21 is being used or slot 2 is empty.)
CQM1H-CTB41 High-speed Counter Board:
IR 232 to IR 243 (12 words): Used by the Board
CQM1H-PLB21 Pulse I/O Board:
IR 232 to IR 239 (8 words): Used by the Board
IR 240 to IR 243 (4 words): Not used.
CQM1H-ABB21 Absolute Encoder Interface Board:
IR 232 to IR 239 (8 words): Used by the Board
IR 240 to IR 243 (4 words): Not used.
CQM1H-MAB42 Analog I/O Board:
IR 232 to IR 239 (8 words): Used by the Board
IR 240 to IR 243 (4 words): Not used.
SR area
184 bits SR 244 to
SR 255
SR 24400
to
SR 25507
These bits serve specific functions such as flags and control
bits.
HR area
1,600
bits
HR 00 to
HR 99
HR 0000 to
HR 9915
These bits store data and retain their ON/OFF status when
power is turned OFF.
AR area
448 bits AR 00 to
AR 27
AR 0000 to
AR 2715
These bits serve specific functions such as flags and control
bits.
TR area
8 bits
---
TR 0 to TR
7
These bits are used to temporarily store ON/OFF status at
program branches.
LR area (note 1)
1,024
bits
LR 00 to
LR 63
LR 0000 to
LR 6315
Used for 1:1 Data Link through the RS-232 port or through a
Controller Link Unit.
Timer/Counter area
(note 3)
512 bits TIM/CNT 000 to
TIM/CNT 511
(timer/counter num-
bers)
The same numbers are used for both timers and counters.
When TIMH(15) is being used, timer numbers 000 to 015
can be interrupt-refreshed to ensure proper timing during
long cycles.
DM area
Read/write
3,072
words
DM 0000
to
DM 3071
---
DM area data can be accessed in word units only. Word val-
ues are retained when power is turned OFF.
3,072
words
DM 3072
to
DM 6143
---
Available in CQM1H-CPU51/61 CPU Units only.
Read-only
(note 4)
425
words
DM 6144
to
DM 6568
---
Cannot be overwritten from program (only a Programming
Device).
DM 6400 to DM 6409 (10 words):
Controller Link DM parameter area
DM 6450 to DM 6499 (50 words):
Routing table area
DM 6550 to DM 6559 (10 words):
Serial Communications Board settings
Error log
area
(note 4)
31
words
DM 6569
to
DM 6599
---
Used to store the time of occurrence and error code of errors
that occur.
PC Setup
(note 4)
56
words
DM 6600
to
DM 6655
---
Used to store various parameters that control PC operation.
EM area
6,144
words
EM 0000
to
EM 6143
---
EM area data can be accessed in word units only. Word
values are retained when power is turned OFF.
Available in the CQM1H-CPU61 CPU Unit only.
Data area
Size
Words
Bits
Function
