Mitsubishi Electric Melsec-Q172DCPU User Manual page 216

6 INSPECTION AND MAINTENANCE
(i) Flowchart for when " . . ." displays on 7-segment LED
" . . ." displays at the WDT error occurrence.
The following shows the flowchart for when " . . ." displays on 7-segment
LED during operation.
" . . ." displays on 7-segment LED
Confirm details of error by Motion
CPU error batch monitor of
MT Developer2.
Is the error
code of Motion CPU WDT
cause "1"?
Correct the main cycle not to exceed
1.0[s] by the following methods, and
write it to Motion CPU.
1) Change the operation cycle to
large value in the system setting.
2) Reduce the number of execution to
the event task program and NMI
task program in the Motion SFC
program. (SV13/SV22)
3) Reduce the number of execution to
the normal task program executed
simultaneously in the Motion SFC
program. (SV13/SV22)
4) Reduce the number of automatic
refresh points of CPU shared
memory.
Reset the Multiple CPU system.
Does " . . ." disappear
on 7-segment LED.
END
NO
YES
Correct the Motion operating time to
shorten by the following methods,
and write it to Motion CPU.
1) Change the operation cycle to
2) Reduce the number of execution to
NO
YES
Explain the error symptom and get
advice from our sales representative.
6 - 27
Is the error
code of Motion CPU WDT
cause "2"?
YES
large value in the system setting.
the event task program and NMI
task program in the Motion SFC
program. (SV13/SV22)
NO