Mitsubishi Electric Melsec A Series - Flow Chart Used When RUN LED of the A2 CCPU Has Turned off

9. TROUBLESHOOTING
9.2.3 Flow chart used when "RUN" LED of the A2CCPU has turned off
MELSEC-A
I
•
•
"RUN" LEDhasturned off.
Is the ERUN key switch
NO
Move the RUN key switch to RUN.
set at RUN?
I
YES
Is an error YES Take corrective action according to the error
indicated on the peripheral?
code list.
NO
"RUN" LED
I
turns on.
(1 )
Due to failure of PC parts of bad contact.
"RESET" CPU
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(2) Due to excessive noise.
"RUN" LED remains off.
In eese of (1)
In case of (2)
After resetting with the RUN key switch of the
CPU module, move
the switch to STOP.
Consult the sales representative with details.
Write END to address 0 with the peripheral
device.
"RUN" LED does not turns
Move the RUN keyswiteh to RUN.
I
"RUN" LED turns on.
Softwear error.
Check program with programmer and correct Connect noise suppression circuit, such as
the program.
CR, to noise source.
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