5-2 Connecting to the Host Using Controller Link
Troubleshooting with LNK Indicator
- Data Links Cannot Be Started
The following table describes the LNK indicator and remedies when a data link cannot be
started.
Starting a data link depends on the Controller Link Interface Unit operating normally and par-
ticipating in the network. Refer to Troubleshooting with RUN, ERC, ERH, and INS Indicators
earlier in this section and check operation before using the following table.
Indicator
LNK
Probable cause
Remedy
Lit Data link operating normally.
Flashing There is an error in the data link tables. If ERH or ERR indicator is lit, reset the
data link tables.
When manual setting is used, either data
link tables have not been created for the
startup node or there is an error in the
data link tables.
Create the data link tables for the startup
node using the CX-Server.
Not lit Manually set data links are already operat-
ing on the same Network.
Set data link tables for the local node.
Automatically set data links are already
operating on the same Network.
Stop the data links, review and set the
parameters in the startup node's DM area,
and then restart.
The PT cannot be the startup node for
automatic settings. Settings must be per-
formed at Controller Link Unit on the PLC.
- Node Cannot Participate in Data Links
The following table describes the LNK indicator and remedies when a Node cannot partici-
pate in the data links.
Data link participation in the network depends on the Controller Link Interface Unit operating
normally and participating in the network. Refer to Troubleshooting with RUN, ERC, ERH, and
INS Indicators earlier in this section and check operation before using the following table.
Indicator
LNK
Probable cause
Remedy
Lit Data Link operating normally.
Flashing When manual setting is used, there is an
error in the data link table.
Reset data link tables using the CX-
Server.
Not lit When manual setting is used, there are no
Data Link Tables set for the local node.
Set the data link tables for the local node.
When automatic setting is used, the setup
node is not set to participate in the data
links.
Stop the data links, remake and set the
parameters in the Startup node’s DM
Area, and then restart the data links.
Setting must be performed at PLC on the
Controller Unit side, because the Control-
ler Link Interface Unit cannot be the
startup node for automatic settings. For
details, refer to the Controller Link Units
Operation Manual.
5-23
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