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6. TROUBLESHOOTING
(4) When AJ65BT-64RD's "L RUN." LED is off
Cables are broken or shorted.
The master station has the stopped data link.
Duplicate station number.
The setting switch is set outside the range
(station number 0, or 62 or greater, transmission
speed 5 to 9).
(5) When AJ65BT-64RD's "L ERR." LED flikers
The setting of station number switch or
transmission speed switch is changed during
normal operation.
The station number switch or transmission
speed switch is faulty.
(6) When AJ65BT-64RD's "L ERR." LED is on
The setting switch is set outside the range
(station number 0, or 62 or greater, transmission
speed 5 to 9).
Forgot to install the terminal resistor.
AJ65BT-64RD or transmission cable is affected
by noise.
Cause
Look for the broken or shorted transmission cables and repair
them.
Confirm that no error has occurred in the master station.
Correct the station number setting of the duplicate module, then
restart the power *1.
Correct the setting switch setting, then restart the power *1.
Cause
Reinstate the station number or transmission speed setting to
the original setting before the change, then restart the power.
*1.
If "L RUN" LED does not come on after power restart, contact
the nearest representative or branch regarding the problem, as
hardware may be faulty.
If "L ERR." LED starts to flicker while in operation even though
no change has been made to the switch setting, contact the
nearest representative or branch regarding the problem, as
hardware may be faulty.
Cause
Correct the setting switch setting, then restart the power. *1
Confirm whether the terminal resistor is installed. If the terminal
resistor is not connected, connect it, then restart the power. *1
• Ground (class D grounding) the both ends of shield of the
• Securely ground the FG terminal of the module.
• When performing pipe wiring, securely ground the pipe.
*1 Restart power : Turn on the power supply again, or turn on the reset switch.
6-2
Corrective action
Corrective action
Corrective action
CC-Link dedicated cable via SLD and FG of each module.
MELSEC-A
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