Mitsubishi Electric MELSEC-Q Series User Manual page 272

(2) Troubleshooting common to modules
Perform the hardware test.
If a master/local module-related error
was not detected, troubleshoot the
CPU module with reference to the
following.
(hardware design, maintenance and
inspection)
270
Start
Page 324, Section 11.5
Was the hardware
test performed?
Yes
Is the hardware test
completed normally?
Yes
Manual for the CPU module used
End
No
No
Replace the target module.