[E11]
Yes
Fault with the internal
board (MCC-1643)
→
Replace
Yes
No
No
No
Is the
connection for the
UART communication
connector (
MCC-1643
CN521, MCC-1610
CN505
) normal?
Is connector
lead wire for the UART
communication
cut?
Red LED (LD1)
of
Optional board
not illuminated.
Red LED (LD1)
light on the
Optional
board
flashes
on and off.
Red LED (LD1)
of
Optional
blinks.
board
No
Yes
Fault with the external
input/output board
→
Replace
No
Lead wire is cut or fault
of input/output board.
Yes
Check the operating status.
Repair of connector
connection.
Yes
Replacement of the
connector’s lead wire.
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