Mitsubishi Electric MELSEC Q Series Reference Manual page 511

(3) When cyclic data are lost or momentarily lost at the time of system switching
The following flowchart shows the procedures to be taken when cyclic data are lost or momentarily lost at the time
of system switching.
Cyclic data are lost or momentarily lost
at the time of system switching.
Are the transfer
source CPU-side devices in the
own station send range in LB/LW
set within the tracking transfer
range?
Yes
Write the parameters to the programmable
controller by Programming tool.
If the problem persists, create a new project and
execute the writing again.
Refer to the troubleshooting in the following manual.
QnPRHCPU User's Manual
(Redundant System)
End
Check the tracking transfer range.
No
QnPRHCPU User's Manual
(Redundant System)
CHAPTER 10 TROUBLESHOOTING
509
10