Mitsubishi Electric R16MTCPU, User Manual

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6 TROUBLESHOOTING
6.3 Checking LED Display
6.3
Checking LED Display
Checking LEDs is a means for confirming the status of a module and should be performed as the primary diagnosis.
Checking LED display of the Motion CPU module
The following describes the items to check when checking the LED display of the Motion CPU module.
By checking the READY LED, ERROR LED, and dot matrix LED, confirming if an error has occurred is possible by visual
inspection.
READY LED, ERROR LED
Dot matrix LED
Refer to dot matrix LED display for the dot matrix LED displays. (  Page 34 Dot matrix LED display)
LED display status Error status Program
execution status Details Correction
READY ERROR
ON OFF No error Continued Operating normally

ON Minor error occurrence Due to an incorrect program or
parameter setting, or the status of
external signals, axis operation cannot
be started/continued. The program has
detected a minor error or warning and
can continue. Use MT Developer2 to specify the
cause and correct the error.
Flickering Moderate error
occurrence Stopped Due to an incorrect program or
parameter setting, or momentary
noise, the program and axis operation
cannot continue.
OFF ON/
flickering Major error occurrence Due to a hardware error etc., operation
is stopped. If the problem cannot be resolved after
troubleshooting, exchange the module
where the error is occurring.
OFF Hardware error Check the input of power supply. If the
power supply is correctly input, there
may be a hardware error.
If the problem cannot be resolved after
troubleshooting, exchange the module
where the error is occurring.
No error No power supply input, power failure

Flickering OFF No error Initializing 