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Troubleshooting Using Indicators Section 9-1
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 Bus Connection Unit
has become loose.
Tighten the mounting
screws on the Bus Con-
nection Unit.
The Controller Link Unit is
mounted in the wrong slot.
Refer to C200HX/HG/HE
PLCs and CJ-series PLCs
and mount the Unit cor-
rectly.
The Controller Link Unit is
faulty.
If the indicators do not light
when the Unit is mounted
on 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
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, turn
OFF the Routing Table
Enable Bit.
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.
Indicators Probable cause Probable remedy
RUN ERC ERH INS