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6 TROUBLESHOOTING
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(3) When the AJ65VBTCU-68DAVN "RUN" LED is off
Check item
Is an attempt made to perform operation in the
normal mode with the mode select switch set in the
test mode?
Has the watchdog timer error occurred?
(4) When the AJ65VBTCU-68DAVN "L RUN" LED is off
Communications are broken.
For details, refer to troubleshooting in the user's manual of the master module
used.
(5) When the AJ65VBTCU-68DAVN "L ERR." LED flickers at fixed intervals
Check item
Has the station number or transmission speed
setting switch position been changed during normal
operation?
Is the station number or transmission speed setting
switch faulty?
(6) When the AJ65VBTCU-68DAVN "L ERR." LED flickers at unfixed intervals
Check item
Have you forgotten fitting the terminating resistor?
Is the module or CC-Link dedicated cable affected
by noise?
(7) When the AJ65VBTCU-68DAVN "L ERR." LED is on
Check item
Are the station number and transmission speed
correct?
Corrective action
Switch power on again after setting the mode select
switch to the normal mode.
Using the link special registers (SW0084 to
SW0087) of the master module, check the
watchdog timer error and power on the
AJ65VBTCU-68DAVN again.
If the "RUN" LED is not lit after power is switched
on again, the possible cause is a hardware fault.
Contact your nearest Mitsubishi representative.
Corrective action
After correcting the setting switch setting, switch
power on again.
If the "L ERR." LED has begun flickering though
switch setting change was not made during
operation, the possible cause is a hardware fault.
Contact your nearest Mitsubishi representative.
Corrective action
Check whether the terminating resistor is fitted. If it
is not connected, connect it and switch power on
again.
Earth both ends of the shield wire of the CC-Link
dedicated cable to the protective earth conductor
via SLD and FG of the corresponding module.
Earth the FG terminal of the module without fail.
When carrying out wiring in piping, earth the pipe
without fail.
Corrective action
Set the correct station number and transmission
speed.
MELSEC-A
6 - 3
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Table of Contents
Troubleshooting
