Mitsubishi Electric MELSEC QS Series User Manual page 137

9
TROUBLESHOOTING
Description of problem
Is there any breakage on
CC-Link dedicated
cables?
Are terminating resistors
connected to the stations
located at both ends of the
CC-Link Safety system?
A communication error
occurs during
communication with a
Are CC-Link dedicated
remote station.
cables being used?
Are different types of CC-
Link dedicated cables
used together?
Has any error occurred on
the remote station?
Is power properly supplied
to the remote station?
A remote station is not
started.
Is the number of
connected remote stations
larger than the All connect
count value that is preset
in network parameters?
Check item Check procedure
Check the CC-Link
dedicated cables (for
breakage, short-circuit,
incorrect wiring, poor
contact or
nonconformance) visually
or by the CC-Link
diagnostics line test.
Visually check the
connection of the
terminating resistors.
Check the specifications
of the cables.
Check the status of the
remote station by the
other station monitor of
the CC-Link diagnostics.
Check the power supply
to the remote station.
Check the All connect
count value preset in
network parameters and
the number of remote
stations actually
connected.
9.1 Checking the Condition by Each Problem
Check result
Remove the cause of the
A cable fault is found. fault and correct the
connection.
No cable fault is found. Check other items.
Terminating resistors are Connect terminating
not connected to the resistors suitable for the
terminal stations, or they cable type to both ends of
are connected to any the CC-Link Safety
other stations. network.
Terminating resistors are
connected to the terminal Check other items.
stations.
They are not CC-Link Use CC-Link dedicated
dedicated cables. cables.
Different types of CC-Link
Use only one type of CC-
dedicated cables are used
Link dedicated cables.
together.
Only one type of CC-Link
Check other items.
dedicated cables is used.
An error has occurred on Perform troubleshooting
the remote station. for the remote module.
Check other items. If all
the check results are
normal, a hardware fault
No error has occurred on of the safety master
the remote station. module or the remote
module may be probable.
Contact your local
Mitsubishi representative.
Power is not supplied to
the remote station, or Supply the power properly
power is supplied to the remote station.
inproperly.
Power is properly supplied
Check other items.
to the remote station.
The number of remote Correct the All connect
stations actually count value in network
connected is larger than parameters so that it is
the All connect count matched with the number
value preset in network of remote stations actually
parameters. connected.
The number of remote
stations actually
connected is not larger
Check other items.
than the All connect count
value preset in network
parameters.
9
Corrective action
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