Omron OMNUC G User Manual page 400

8-3 Troubleshooting
Error Diagnosis Using the Operating Status
Symptom
7-segment
LED is not lit.
LED (COM)
is not lit.
LED (COM)
is flashing in
green.
LED (COM)
is lit in green.
LED (COM)
8
is flashing in red.
LED (COM)
is lit in red.
An alarm has
occurred.
8-15
Probable cause
No control power supply.
MECHATROLINK-II
communications not
actuated.
Asynchronous communica-
tions on the
MECHATROLINK-II
communications actuated.
Synchronous communica-
tions on the
MECHATROLINK-II
communications actuated.
Recoverable alarm related
to MECHATROLINK-II
communications.
Irrecoverable alarm related
to MECHATROLINK-II
communications.
Read the alarm code and
the alarm history.
Items to check
Check that the control power supply
voltage is within the specified
range.
Check that the power supply input
is wired correctly.
Check that the network cable
is connected correctly.
Check that the terminator is
connected.
Can be controlled from the host
controller (Normal status).
Controllable status (Normal status). Normal status.
Reset and actuate the network
again from the host controller.
Check the network wiring.
Check that there is no overlap of
node address on the network, and
that the number of connected
Servo Drives is less than 17.
Check details of alarm by referring
to Error Diagnosis Using the Dis-
played Alarm Codes on page 8-7.
Countermeasure
Ensure that power is
supplied properly.
Wire correctly.
Check that the host
controller is running.
Check the connector and
connection.
Normal status.
Check the wiring and noise.
Correct the network
address.
Take countermeasures by
referring to Error Diagnosis
Using the Displayed Alarm
Codes on page 8-7.