Omron CQM1H - 08-2005 - Page 72

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Unit Specifications Section 2-1
Note 1. IR and LR bits that are not used for their allocated functions can be used
as work bits.
2. A minimum of 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 to-
tal number of available work bits depends on the configuration of the PC.
3. When accessing a PV, TIM/CNT numbers are used as word address; when
accessing Completion Flags, they are used as bit addresses.
4. DM 6144 to DM 6655 cannot be written from the program.
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 numbers)
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 values are retained when the 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 written from the program (only from a
Programming Device).
DM 6400 to DM 6409 (10 words):
Controller Link parameters
DM 6450 to DM 6499 (50 words):
Routing tables
DM 6550 to DM 6559 (10 words):
Serial Communications Board settings
Error
history
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 the power
is turned off.
Available in the CQM1H-CPU61 CPU Unit only.
Data area Size Words Bits Function