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Troubleshooting; Error Processing And Recovery Method; Preliminary Check By Led Status - Mitsubishi Electric MELSEC L-Series User Manual

Programmable logic controllers.
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Error Processing and Recovery Method

8

Troubleshooting

8.1
Error Processing and Recovery Method
8.1.1

Preliminary check by LED status

LED
RUN
CAN ERR
ERR.
Tab. 8-1:
* The LEDs CAN RUN and CAN ERR have four kinds of flicker states (according to CiA€-303-3 V1.4): single flash, double flash,
blinking, and flickering. These LEDs flicker as follows.
SINGLE FLASH
DOUBLE FLASH
BLINKING
FLICKERING
MELSEC-L Series – CANopen€ Module ME3CAN1-L
Status
Cause
The watchdog monitoring time
OFF
has been exceeded.
The CAN controller is bus
OFF.
ON
The CAN controller has too
many transmission errors.
FLICKERING*
LSS services in progress
BLINKING*
General error
Error control event.
A NMT guarding failure (NMT-
DOUBLE FLASH*
Slave or NMT-Master) or a heart-
beat failure (heartbeat con-
sumer) has occurred.
SINGLE FLASH*
Warning limit reached
An unexpected error other than
ON
the errors described above has
occurred.
Indication of errors
0.2 s
0.2 s
0.2 s
0.2 s
0.2 s
0.1 s
Action
Please consult your local Mitsubishi representative,
explaining a detailed description of the problem.
Check the error status in Un\G29.
Check the ERROR LED of the PLC.
Check the sequence program for FROM/TO
watchdog.
Check the error status in Un\G29.
Check the error status in Un\G29.
Check that the terminating resistors at both ends
of the network are connected.
Check that all nodes have the same baud rate
setting.
Check that all nodes have a unique node-ID
setting.
Check that the CAN_H, CAN_L and CAN_GND
wires are not broken.
Check that the CAN_SHLD is grounded.
Check that the CAN_SHLD is connected at all
nodes.
Check that the CAN cable wires do not short cir-
cuit other CAN cable wires.
Please consult your local Mitsubishi representative,
explaining a detailed description of the problem.
1 s
0.2 s
Troubleshooting
1 s
8 – 1

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