Mitsubishi Electric Melsec-Q172DCPU User Manual page 214

6 INSPECTION AND MAINTENANCE
"AL"
on 7-segment LED.
Confirm details of error by Motion
CPU error batch monitor of
MT Developer2.
Correct each Multiple CPU system
setting based on the error causes .
Reset the Multiple CPU system.
" " disappear on 7-segment
(g) Flowchart for when "AL"
LED.
""AL" (flashes 3 times)
diagnosis error occurrence.
The following shows the flowchart for when ""AL" (flashes 3 times)
Steady "A1" display
: 4-digits error code is displayed in two sequential flashes of 2-digits each.
"A1" " " displays
Hardware cause fault?
NO
Does "AL" "A1"
LED.
YES
END
"A1"
Steady "A1" display
" "" displays during operation.
YES
Noise cause?
YES
Take measures against noise.
NO
6 - 25
" " displays on 7-segment
" "" displays at the self-
NO
Explain the error symptom and get
advice from our sales representative.