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Troubleshooting Using Indicators
Section 9-1
Troubleshooting with LNK and M/A Indicators
Data Link Cannot be
Started
The following table describes the LNK and M/A indicators at the startup node
and their use in troubleshooting when a data link cannot be started.
Starting a data link depends on the Controller Link Unit operating normally
and participating in the Network. Refer to Troubleshooting with RUN, ERC,
ERH and INS Indicators earlier in this section and check Unit operation before
using the following table.
Lit
---
---
Not lit Terminating resistance is
not set correctly. (Wired
Unit)
Turn ON the terminating
resistance at the nodes at
both ends of the Network
and turn it OFF at all other
nodes.
Cables are not connected
correctly.
Check the cable connec-
tions are reconnect cor-
rectly.
The node address is larger
than the maximum node
address set for the network
parameters.
Either reset the maximum
node address using the
Controller Link Support
Software or reset the node
address to below the maxi-
mum.
No other nodes exist.
Make sure that 2 or more
nodes exist within the Net-
work.
No nodes have been set as
polling nodes.
Refer to 8-1-2 Setting the
Polling and Polled Nodes
and set at least one polling
node. (Controller Link
Units should normally be
set as polling nodes.)
The set baud rate is differ-
ent to other nodes (Wired
Unit).
Refer to Section SEC-
TION 4 Preparations for
Communications and reset
the baud rate.
Indicators
Probable cause
Probable remedy
RUN
ERC
ERH
INS
Indicators
Probable cause
Probable remedy
LNK
M/A
Lit
---
Data link operating normally.
---
Flashing
---
There is an error in the data
link tables.
When the ERH indicator is
flashing, remake and set 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.
Refer to 5-2-2 Manual Setting
and set data link tables for the
startup node.
When automatic setting is
used, either the data link
parameters for the startup
node have not been set or
there is an error in the data link
tables.
Refer to 5-2-4 Automatic Set-
ting: “Select All” and set the
automatic parameters for start-
ing the data links.
Not lit
Lit
Manually set data links are
already operating on the same
Network.
Stop the manually set data
links that are operating and
restart the data links.
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