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What Are Data Links?
Note
Using Offsets
Offset from the beginning
Number of words to be received
1. Automatic data link creation with 1:N allocations can only be used with the
following Controller Link Units and Support Boards:
Wired Networks
Optical Ring Networks
using H-PCF Cable
Optical Ring Networks
using GI Cable
2. Lot numbers 030601 or later.
3. Controller Link Units and Support Boards other than those listed above
cannot participate in 1:N allocation data links. They can, however, join the
network if a parameter in the DM Parameter Area is set so that they do not
participate in the data links.
4. The Controller Link Support Board can be used in automatic data link cre-
ation with 1:N allocations, but it cannot be the startup node. Use a Control-
ler Link Unit on the same network as the startup node.
5. For automatic data link creation with 1:N allocations, use the CX-Net in
CX-Programmer version 3.2 or later.
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.
# 1
Automatically set
data links
# 1
# 2
# 3
# 1
Manually set
data links
# 1
# 2
# 3
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
received.
Offsetting enables specification of a more specific range of receive data by
indicating both the number of words and the starting word position from the
beginning of the area. The offset refers to the starting word position counted
from the beginning of the area.
# 1
# 1
# 2
# 3
CS1W-CLK23, CJ1W-CLK23, 3G8F7-CLK23-E,
CS1W-CLK21-V1, CJ1W-CLK21-V1, and 3G8F7-
CLK21-EV1
CS1W-CLK13, 3G8F7-CLK13-E,
CS1W-CLK12-V1 (See note 2.), and 3G8F7-CLK12-EV1
CS1W-CLK53, 3G8F7-CLK53-E,
CS1W-CLK52-V1 (See note 2.), and 3G8F7-CLK52-EV1
# 2
# 1
# 2
# 3
# 2
# 1
# 2
# 3
A node can specify the number of
words to receive from the beginning
send word.
# 2
# 1
# 2
# 3
Restricted reception
Restricted reception
from node 1 by
from node 2 by
specifying an offset
specifying an offset
Section 5-1
# 3
# 1
# 2
# 3
# 3
# 1
# 2
# 3
# 3
# 3
# 2
# 1
75
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