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Troubleshooting Using Indicators Section 9-1
Data Link Cannot be
Stopped
Stopping the data link depends on the Controller Link Unit operating normally
and participating in the Network. Read the above explanations before
attempting to stop operation.
Note Stop the data link from the node at which the LNK indicator is lit (indicating
active data links). Data links cannot be stopped from nodes which do not have
active data links.
9-1-3 CVM1 and CV-series Controller Link Units
Troubleshooting with RUN, ERC, ERH and INS Indicators
The RUN, ERC, ERH and INS indicators can be used to check whether Con-
troller Link Unit startup and Network participation are operating normally.
Note Be sure to turn off the power to the PLC before performing any of the follow-
ing.
• Disconnecting the Unit or connectors.
• Securing Units or connectors.
Indicators Probable cause Probable remedy
LNK M/A
Lit --- Data link operating normally. ---
Flashing Lit When manual setting is used,
there is an error in the data link
table.
Refer to 5-2-2 Manual Setting
and remake the data link table.
Flashing Not lit When automatic setting is
used, the data link parameters
at the startup node are incor-
rect for the local node (the
data link area is out of range
for the local node.)
Refer to 5-2-4 Automatic Set-
ting, reset the parameters for
the startup node DM Area so
that the local node can partici-
pate in the data link, and then
restart the data link.
Automatic setting is used with
1:N allocations, but the device
does not support this function.
Use a Controller Link Unit that
supports automatic data link
creation with 1:N allocations.
Refer to Automatic Setting on
page 129 for details.
Not lit Lit When manual setting is used,
there are no data link tables
set for the local node.
Set data link tables for the
local node.
Not lit Not lit When automatic setting is
used, the startup 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 link.
RUN
ERC
INS
SD
ERH
LNK
RD
TER
M/A
CLK21
RUN: Operating
ERC: Communications error
INS: Network participation
LNK: Data link
M/A: Data link mode