Mitsubishi Electric MELSEC-L SSCNETIII/H User Manual page 92

(5) When the L ERR. LED turned on
Check item
Appropriate SSCNET III cables are used?
Do other stations connected to the head module normally operate?
Does the set station number correspond with the setting configured in the
Head Module window of MT Developer2?
Is there any noise affecting the system?
If the above action does not solve the problem, perform the unit test on the head module to check for a hardware
error. ( Page 44, Section 6.4)
(6) When the REM. LED turned off
Check item
Has an error occurred in the head module?
(7) When the REM. LED is flashing
Check item
Are any forced I/O data being registered?
After execution of "Write to PLC", was the head module reset?
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• Check that Mitsubishi SSCNET III cables are used. ( User's manual for the
Motion controller used)
• Check if the station-to-station distance is 50m or less.
• Check if the SSCNET III cables are not disconnected.
Check the operating status of modules on other stations.
Check the station number setting of each module in the Head Module window of
MT Developer2.
If a station number different from the setting is set, power off the head module to
correct the station number then power on the module again.
Check the wiring condition.
From "System Monitor" in GX Works2, identify the cause of the error and take
action. ( Page 83, Section 11.2)
Cancel the registration.
Reset the head module.
Action
Action
Action