Mitsubishi Electric Melsec-Q172DCPU User Manual page 211

6 INSPECTION AND MAINTENANCE
(d) Flowchart for when "A00" displays on 7-segment LED
"A00" displays when the operating system software is not installed.
The following shows the flowchart for when "A00" displays on 7-segment
LED at the power supply ON or operation start.
"A00" displays on 7-segment LED
Is the
operating system
software installed to Motion
CPU module?
Reset the Multiple CPU system.
Does "A00" disappear
on 7-segment LED?
END
NO
Install the operating system software.
YES
NO
YES
Explain the error symptom and get
advice from our sales representative.
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