Mitsubishi Electric MELSEC L Series User Manual page 48

When completed
When failed
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6.
Unit test starts.
The MODE LED starts flashing, and the 1 or 10 LED
starts turning on and off repeatedly in the sequence of
12481.
7.
The 1 or 10 LED stops turning on and off, and the
D LINK LED turns on when the test is completed.
• When completed successfully
The D LINK LED turns on, and the ERR. LED remains off.
• When failed
The following LEDs turn on.
 Either the 1 or 10 LED
 ERR. LED
 D LINK LED
If the test fails, replace the Ethernet cable, and perform
the test again. If the test fails again, the possible cause
is a hardware failure of the head module.
Please consult your local Mitsubishi representative.