6. TROUBLESHOOTING
MELSEC-A
6-2
(4) When AJ65BT-68TD's "L RUN" LED is off
Cause Corrective
action
Cables are broken or shorted.
Look for the broken or shorted transmission cables and repair
them.
The master station has the stopped data link.
Confirm that no error has occurred in the master station.
Duplicate station number.
Correct the station number setting of the duplicate module, then
restart the power *1.
The setting switch is set outside the range
(station number 0, or 62 or greater, transmission
speed 5 to 9).
Correct the setting switch setting, then restart the power *1.
(5) When AJ65BT-68TD's "L ERR" LED flikers
Cause Corrective
action
The setting of station number switch or
transmission speed switch is changed during
normal operation.
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.
The station number switch or transmission
speed switch is 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.
(6) When AJ65BT-68TD's "L ERR" LED is on
Cause Corrective
action
The setting switch is set outside the range
(station number 0, or 62 or greater, transmission
speed 5 to 9).
Correct the setting switch setting, then restart the power. *1
Forgot to install the terminal resistor.
Confirm whether the terminal resistor is installed. If the terminal
resistor is not connected, connect it, then restart the power. *1
AJ65BT-68TD or transmission cable is affected
by noise.
•
Ground (class 3 grounding) the both ends of shield of the
twisted cable via SLD and FG of each module.
•
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.
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