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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.
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 and 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.
Ensure that 2 or more
nodes exist within the Net-
work.
No nodes have been set as
polling nodes.
and set at least one polling
node. (Controller Link
Units should normally be
set as polling nodes.)
The same operating level
is set more than once for
the same PLC.
Reset so that each operat-
ing level is used only once.
The Bus Connection Unit
has become loose.
Tighten the mounting
screws on the Bus Con-
nection Unit (C200HX/HG/
HE PLCs only).
The set baud rate is differ-
ent to other nodes.
and set all nodes on
the network to the same
baud rate.
Indicators
Probable cause
Probable remedy
RUN
ERC
ERH
INS
Summary of Contents for C200HW-CLK21
Page 3: ...iv ...
Page 9: ...x ...
Page 12: ...xiii TABLE OF CONTENTS Index 367 Revision History 373 ...
Page 13: ...xiv ...
Page 19: ...xx ...
Page 57: ...32 Application Precautions Section 1 5 Example CX Programmer Response Timeout Setting ...
Page 69: ...44 Message Service Procedure Section 2 2 ...
Page 111: ...86 Constructing Networks with Repeater Units Section 3 4 ...
Page 154: ...129 Setting Data Links Section 5 2 Device Information Setting Data Link Tables ...
Page 261: ...236 Response Codes Section 6 7 ...
Page 297: ...272 Message Delay Times Section 8 4 ...
Page 353: ...328 Handling Precautions Section 9 6 ...
Page 364: ...339 Changing the Data Link Tables with Active Data Links Section 10 2 ...
Page 365: ...340 Changing the Data Link Tables with Active Data Links Section 10 2 ...
Page 369: ...344 Standard Models Appendix A ...
Page 391: ...366 Using the Relay Terminal Block Appendix C ...
Page 397: ...372 Index ...
Page 401: ...376 Revision History ...