5-1
Section
What Are Data Links?
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All nodes can be specified to either participate or not participate in the data link.
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The data link areas are exactly the same and common to all nodes participat-
ing in the data links.
Note The Controller Link Support Software contains a function called
“Easy Setting” that can be used within the manual data link mode to
register the same data links as automatic setting. This Easy Setting
can be used first, and then the send size of each node and other set-
tings can be changed as required.
Using Offsets
For automatically set data links, all of the send words transmitted by a node are
received by other nodes with no change in size. For manually set data links, the
size of a receive area can be restricted by specifying a number of words from the
beginning word of the words sent by another node.
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Manually set
data links
A node can specify the number of
words to receive from the begin-
ning send word.
Automatically set
data links
However, the above system does not guarantee that only the desired words will
be received and there is a good chance that unnecessary data will also be re-
ceived.
Offsetting enables specification of a more specific range of receive data by indi-
cating both the number of words and the starting word position from the begin-
ning of the area. The offset refers to the starting word position counted from the
beginning of the area.
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Offset from the beginning
Number of words to be received
Restricted reception
from node 1 by
specifying an offset
Restricted reception
from node 2 by
specifying an offset
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