Mitsubishi Electric CC-Link User Manual page 36

6 TROUBLESHOOTING
LED status
Master CC-Link embedded I/O adapter
module
A
PW PW
L RUN L RUN
L ERR L ERR
PW PW
TIME
L RUN L RUN
LINE
L ERR L ERR
or
TIME
LINE
PW PW
L RUN L RUN
L ERR L ERR
PW PW
L RUN L RUN
L ERR L ERR
TIME PW PW
LINE
L RUN L RUN
or
6 L ERR L ERR
TIME
LINE
PW PW
L RUN L RUN
L ERR L ERR
6 - 2
B C
PW The L RUN light on the CC-Link
L RUN embedded I/O adapter B is off, indicating
L ERR the transmission speed setting for CC-
Link embedded I/O adapter B is invalid
within the setting range (0 to 4).
PW The L ERR of the CC-Link embedded
L RUN I/O adapter C is flashing at fixed
L ERR intervals, indicating the setting switch for
CC-Link embedded I/O adapter C has
been changed during normal operation.
PW The L RUN of the CC-Link embedded
L RUN I/O adapter A is off and L ERR of the
L ERR same CC-Link embedded I/O adapter is
lit, indicating the setting switch for CC-
Link embedded I/O adapter A is set out
of range (transmission speed: 5 to 9,
station number: 65 or greater).
PW The L ERR of the CC-Link embedded
L RUN I/O adapter B is lit, indicating that CC-
L ERR Link embedded I/O adapter B is being
affected by noise. (L RUN may be off.)
PW The L ERR lights on the CC-Link
L RUN embedded I/O adapter B and beyond
L ERR are lit, indicating the transmission cable
is affected by noise in the area between
CC-Link embedded I/O adapters A and
B. (L RUN may be off.)
PW A terminal resistor is not attached.
L RUN (L RUN may be off.)
L ERR
Cause
Restart the power supply after the transmission
speed is set correctly.
Return the setting switch of the CC-Link
embedded I/O adapter to the original position.
Correct the setting switch of the CC-Link
embedded I/O adapter, and restart the power
supply.
Correctly perform grounding of the FGs for the
master module and all CC-Link embedded I/O
adapters.
Verify the grounding of the SLD of the
transmission cable.
Separate the wire from the power cable as
much as possible (100 mm (3.94 in.)or more).
Check if a terminal resistor is attached.
: lit, : unlit,
MELSEC-A
Corrective action
: flashing, : lit, flashing or unlit
6 - 2