Controller Link Units Operation Manual

148
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.
(Data link start word – 1) + Total number of send/receive
words in area
≤ 2555 (CIO Area)
199 (LR Area)
8191 (DM Area for CV500/CVM1-CPU01)
24575 (DM Area for other CPU Units)
32765 (EM Area)
c) When using area 1 only, set the data link start word, type, and
the number of send words of area 2 to 0.
d) When using area 2 only, set the data link start word, type, and
the number of send words of area 1 to 0.
e) The startup node must be registered as a participating node of
the data links. If not, the data links will not start.
Note 1. When data links are automatically created for networks containing
C200HX/HG/HE, CS/CJ-series, CVM1, CV-series, and CQM1H-series
PLCs, the linkable area is restricted to the area of the C200HX/HG/HE or
CQM1H-series PLC because it is smaller than that of CVM1, CV-series or
CS/CJ-series PLCs.
Send size (number of
words) for node of area 2
Set the number of words in BCD between 0 and 1,000.
The total number of send words of area 1 and area 2
must not exceed 1,000.
When area 2 is not used, set to 0.
First data link status word Set in BCD the first word used for storing data link status.
An area of 16 words is used for storing status.
0 (*) or CIO 0001 to CIO 2540
Status is stored in the CIO area only.
*: When 0 is set, the status is saved in CIO 1500 + unit
number x 25 (+ 7 to + 22).
Nodes participating 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 participating node.
The data link will not start if the node is set to a parameter
exceeding the “maximum node address” of the network
parameter.
Item Setting range