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Troubleshooting Using Indicators Section 9-1
• Setting hardware switches.
Indicators Probable cause Probable remedy
RUN ERC ERH INS
Lit Not lit Not lit Lit Unit operating normally;
Network participation nor-
mal.
---
Not lit Lit --- --- Controller Link Unit faulty. If the ERC indicators still
lights when the Unit is
mounted on another PLC,
replace the Controller Link
Unit.
Not lit Not lit Not lit Not lit Power is not being sup-
plied correctly to the PLC.
Check the power supply
voltage and supply at the
recommended voltage.
The Controller Link Unit
has become loose.
Secure the Controller Link
Unit firmly.
The Controller Link Unit is
mounted in the wrong slot.
Refer to CVM1 and CV-
series PLCs and mount the
Unit correctly.
The Controller Link Unit is
faulty.
If the indicators do not light
when the Unit is mounted
in another PLC, replace
the Controller Link Unit.
Lit Lit --- Not lit The node address is out-
side the setting range.
Reset the node address to
within the 1 to 32 range.
The same node address is
being used by two different
Units.
Reset so that each node
address is used only once
within the same Network.
Lit --- Lit --- Routing table setting error
or a Routing Table Enable/
Disable Bit setting error.
Remake and set the rout-
ing table correctly, referring
to 7-4 Setting Routing
Tables . When no routing
table is being used, set the
Routing Table Enable/Dis-
able Bit to OFF.
The Unit is mounted to a
non-compatible PLC.
Refer to 1-2-4 Controller
Link Unit Models and PLCs
and reinstall the Unit on
the appropriate PLC.
An error has occurred in
the PLC.
Refer to the PLC’s opera-
tion manual and correct
the error. If the error occurs
again, replace the PLC.
EEPROM error Refer to 9-2 Status Area
and Troubleshooting, cor-
rect the data where the
error has occurred, and
reset the Unit. If the error
occurs again, replace the
Controller Link Unit.
The unit number is not set
in the range from 0 to 15.
Reset the Unit number to
within a range of 0 to 15.
The same unit number is
set more than once for the
same PLC.
Reset so that each unit
number is set only once
within the same PLC
(including the Expansion
CPU Backplane.)
I/O tables have not been
created for the PLC or they
are faulty.
Create I/O tables for the
PLC correctly.