Mitsubishi Electric Melsec-Q172DCPU User Manual page 208

6 INSPECTION AND MAINTENANCE
(b) Flowchart for when " ." does not flash in the first digit of
7-segment LED
The following shows the flowchart for when " ." does not flash in the first
digit of 7-segment LED.
" ." does not flash in the first digit of
7-segment LED.
Does "POWER"
LED turn on?
YES
Is the
connecting direction
of extension cable correctly?
(Isn't IN-IN or OUT-OUT
connection?)
YES
Is the
RUN/STOP/RESETand
RUN/STOP switch of CPU
No.1 and target CPU Module
set to STOP?
"STOP"
A hardware fault
Check operation in the order starting
with the minimum system.
If the module will not work, explain
the error symptom and get advice
from our sales representative for the
modules with failure.
NO
(a)
"Flowchart for when "POWER" LED
turns off"
NO
Connect the extension cable correctly.
Does " . " flash
NO
in the first digit of 7-segment
"RESET"
Set the RUN/STOP/RESET and
RUN/STOP switch to "STOP".
Does " . " flash
NO
in the first digit of 7-segment
(Note) : Normally, " . " flashes in the first digit of
6 - 19
YES
LED?
YES
LED?
END
7-segment LED.