Mitsubishi Electric Melsec-Q172DCPU User Manual page 213

6 INSPECTION AND MAINTENANCE
"AL" "L01" displays on 7-segment
LED.
Confirm details of error by Motion
CPU error batch monitor of
MT Developer2.
Does a ROM ERROR
occur?
NO
Does a LAY ERROR
(SL**) occur?
NO
Set so that an error does not occur
by a relative check of system setting,
then write to the Motion CPU.
Reset the Multiple CPU system.
Does "A00" "L01"
disappear on 7-segment
LED?
YES
END
(f) Flowchart for when "AL"
""AL" (flashes 3 times)
setting error occurrence.
The following shows the flowchart for when ""AL" (flashes 3 times)
Steady "L01" display" displays during operation.
YES
Is ROM operation executed?
Set a rotary switch1 (SW1) to "0", a
rotary switch2 (SW2) to "6" of Motion
CPU module, and then execute ROM
writing.
Check that the installed modules
YES
correspond to system setting and
correct details of error.
NO
"L01" displays on 7-segment LED
Steady "L01" display" displays at the system
NO
YES
6 - 24
Set a rotary switch1 (SW1) to "0", a
rotary switch2 (SW2) to "0" of Motion
CPU module.
(Mode operated by RAM)