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Setting Data Links Section 5-2
3. When using area 2 only, set the area for area 1 and the number of send
words for area 1 to 0.
4. When using area 1 only, set the area for area 2 and the number of send
words for area 2 to 0.
5. The total number of words in data link send and receive areas must not ex-
ceed 20,000 per node when using Controller Link Units with unit Ver. 1.2
or later, or 12,000 words per node if using pre-Ver. 1.2 Controller Link
Units. The total number of words in data link send and receive areas of a
master node must satisfy the following values. The number of master node
words is greatest when 1:N allocation is used, so the value can be estimat-
ed from the number of master node words.
Total number of words in data link send and receive areas of master
node = Send size for master node for area 1 + Send size for slave
nodes for area 1
× Number of slave nodes participating in data links +
Send size for master node for area 2 + Send size for slave nodes for
area 1
× Number of slave nodes participating in data links
6. The following values must be satisfied to ensure that data link areas 1 and
area 2 are fully contained within the specified area.
• For area 1:
(Area 1 start word
− 1) + (Total of send and receive sizes for master
node for area 1 (See note.))
≤ 6143 (when using the IR or CIO Area)
≤ 199 (when using the LR Area)
Note (Total of send and receive sizes for master node for area 1 =
Send size for master node for area 1 + Send size for slave nodes for
area 1
× Number of slave nodes participating in data links
• For area 2:
(Area 2 start word
− 1) + (Total of send and receive sizes for master
node for area 2 (See note.))
≤ 32767 (when using DM or EM Area)
Note (Total of send and receive sizes for master node for area 2 =
Send size for master node for area 2 + Send size for slave nodes for
area 2
× Number of slave nodes participating in data links
7. If a node that does not actually exist (e.g., a node that is scheduled to be
added in the future) is registered as a node that will participate in the data
links, a data link area for that node will be allocated in the master node, and
the send and receive areas will be refreshed with 0 data.
8. Automatic data link creation with 1:N allocations can be performed only
with CS1W-CLK21-V1, CJ1W-CLK21-V1, 3G8F7-CLK21-V1 Controller
Link Units. If any other model is used, the LNK indicator will flash and it will
not be possible to automatic create 1:N allocations.
9. If automatic data link creation with 1:N allocations is to be set up using CX-
Net operations in the CX-Programmer, use CX-Programmer version 3.2 or
higher. Setup cannot be performed using CX-Programmer version 3.1 or
lower.
10. The startup node (the node that sets the above DM Area Parameters and
starts the data links) can be set as either a master node or a slave node.