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Setting Data Links Section 5-2
Note 1. Node 1 becomes the master node. Node 1 must be registered as a partic-
ipating node.
2. Only one area can be specified when using the chain type of 1:N alloca-
tion.
3. The startup node (the node that sets the above DM parameter and starts
the data link) must be set as a participating node of the data link. If not, the
data links will not start.
4. 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. Since the number of master
node words is greatest when 1:N allocation is used, the value can be esti-
mated from the number of master node words.
Area start word Set the word address in BCD.
IR or CIO Area: 0 to 6143
LR Area: LR 000 to LR 199 (1000 to 1199) (*)
DM Area: DM 0 to 32767
EM Area: Banks 0 to 12 EM 0 to 32767
*: When a word between LR 000 and LR 199 is speci-
fied, the data link area will be allocated between
words 1000 and 1199 in the IR or CIO Area.
Area Set the area type of area 1 as a hexadecimal number.
IR Area: 80 Hex
LR Area: 86 Hex
DM Area: 82 Hex
EM Area Banks 0 to 7: 90 to 97 Hex
Banks 8 to 12: A8 to AC Hex
Number of master com-
mon send words
Set the number of words in BCD between 0 and 1,000.
The number of common send words per master node
added to the number of delivery send words per node
must not exceed 1,000.
Set to 0 if common data is not to be sent from a master
node to a slave node.
No. of receive and send
words per node
Set the number of words in BCD between 0 and 1,000.
The number of common send words per master node
added to the number of delivery send words per node
must not exceed 1,000.
Set to 0 if delivery data is not to be sent.
First word to store data
link status
Set in BCD the first word used for storing data link status.
When automatic setup is used, status can be stored in
the IR or CIO Area only. The number of words used to
store status depends on the data link status storage for-
mat specification as below.
0 (*)
1 to 6128 (32 nodes max., 8-bit format: 16 words used)
*: When 0 is set, the status is saved in IR 1500 + unit
number x 25 (+ 7 to + 22).
Nodes to participate in
the data links
Set to ON (1) the bits corresponding to the nodes partici-
pating in the data links.
The data link will not start unless the startup node itself is
set as a participating node.
Item Setting range