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What Are Data Links? Section 5-1
5-1-2 Differences between Manual and Automatic Setting
Note a) The following are true for computer nodes (i.e., computers with a
Controller Link Support Board mounted).
• The data link starting position is fixed.
• Because areas such as bit-access areas and the DM Area are not sup-
ported, areas must be made available on the computer for linking.
• Automatically set data links cannot be started from the Controller Link
Support Board.
• The Controller Link Support Board can participate in automatically set
data links.
b) If data links are manually set, send/receive area can be selected
in each node, allowing send/receive groups to be created within
the network in area 1 and area 2, as shown below.
Item Manual setting Automatic setting
Determination of
nodes to be in a
data link
Determined by setting data link
tables.
Determined by the data link
parameters set in the data link
startup node (the node used to
start the data links).
Data link settings Set in data link tables that are
set in the nodes to participate in
data links.
Determined by the data link
parameters set in the data link
startup node (the node used to
start the data links).
Data link areas 1
and 2
In each node, area 1 and area
2 are selected from bit-access
areas (IR, CIO, and LR Areas)
and DM Area (DM and EM
Areas).
However, areas 1 and 2 cannot
be set in the same memory
area.
Area 1 is selected from bit-
access areas (IR, CIO, and LR
Areas) and area 2 is selected
from DM Area (DM and EM
Areas).
Refresh starting
word
Can be set freely in each node.
(See note a))
Can be set freely. (See note a))
Data link status
area
Selected from bit-access areas
(IR, CIO, and LR Areas) and
DM Area (DM and EM Areas) in
each node.
Selected from bit-access areas
(IR or CIO Areas).
Refresh sequence Can be set in each node freely. Node addresses are in ascend-
ing order.
Data reception It is possible to set in each
node whether the entire data or
a part of the data sent from
another node is received. It is
also possible to not receive the
data sent from a specific node.
(See note b))
The entire data sent from each
node that is participating in the
data link is received.
Data transmission The send sizes can be set
freely in each node. It is also
possible for certain node not to
send data. (See note b))
In area 1 and area 2, data send
sizes are the same in each
node.
#1 #1 #3
#1 #2
#3
#2
#2
#4
#4
#3
#4Area 1
Group
Group