Mitsubishi Electric Q172DCPU User Manual page 165

6 INSPECTION AND MAINTENANCE
" . . ." displays on 7-segment LED
Confirm details of error by Motion
CPU error batch monitor of
MT Developer.
Is the error
code of Motion CPU WDT
cause "1"?
YES
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.
3) Reduce the number of execution to
the normal task program executed
simultaneously
in the Motion SFC program.
4) Reduce the number of automatic
refresh points of CPU shared
memory.
Reset the Multiple CPU system.
Does " . . ." disappear
on 7-segment LED.
YES
END
(g) Flowchart for when " . . ." displays on 7-segment LED
" . . ." displays at the WDT error occurrence.
The following shows the flowchart when the " . . ." displays during
operation.
NO
Is the error
code of Motion CPU WDT
cause "2"?
Correct the Motion operating time to
shorten 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.
NO
Explain the error symptom and get
advice from out sales representative.
NO
YES
6 - 22
Is the error
code of Motion CPU WDT
cause "301"?
YES
Correct the servo program so that the
number of CPSTART instructions of
8 or more points should not exceed
the number of simultaneous startable
programs (14 or less), and write it to
Motion CPU.
NO