Omron CQM1H-CLK21 - Manual (Page 144)

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Setting Data Links Section 5-2
Note a) The total number of words in data link send and receive areas
must not exceed 8,000 per node.
b) The following values must be satisfied for each node for the data
link area 1 and area 2 so that the final word in the data link does
not go beyond the last word in the PLC memory area.
First data link sta-
tus word Set the first word to store data link status. An area of 16 words is
used.
IR Area: IR 001 to IR 232
LR Area: LR 00 to LR 48
DM Area: DM 0000 to DM 5984
EM Area: EM 0000 to EM 6128 (EM must be installed)
When IR 000 is specified or when the default setting ( ––––– ) is
left unchanged, the default first status word will be used. Refer
to 5-4 Checking Data Link Status for details.
Area 1 Data link
start word IR Area: IR 000 to IR 247
LR Area: LR 00 to LR 63
DM Area: DM 0000 to DM 5999
EM Area: EM 0000 to EM 6143 (EM must be installed)
The same memory area cannot be set for both area 1 and area
2. Set different memory areas.
Number of
words Remote nodes: 0 to the number of source words
Set the number of words to be received.
Local node: 0 to 1,000
Set the number of words to be transmitted.
The total number of words in area 1 and area 2 in each node
must not exceed 1,000.
The numbers of words in both area 1 and area 2 in each node
must not be set to 0.
Offset Remote nodes: 0 to one less than number of source words
Set the offset for the data to be received.
Local node: Cannot be set.
This setting is not required if an offset is not used.
Area 2 Data link
start word IR Area: IR 000 to IR 247
LR Area: LR 00 to LR 63
DM Area: DM 0000 to DM 5999
EM Area: EM 0000 to EM 6143 (EM must be installed)
The same memory area cannot be set for both area 1 and area
2. Set different memory areas.
Number of
words Remote nodes: 0 to the number of source words
Set the number of words to be received.
Local node: 0 to 1,000
Set the number of words to be transmitted.
The total number of words in area 1 and area 2 in each node
must not exceed 1,000.
The numbers of words in both area 1 and area 2 in each node
must not be set to 0.
Offset Remote nodes: 0 to one less than number of source words
Set the offset for the data to be received.
Local node: Cannot be set.
This setting is not required if an offset is not used.
Setting item Setting range