Mitsubishi Electric MELSEC iQ-R Series User Manual page 199

The control CPU of the local station cannot be synchronized time
When the time synchronization does not operate for the control CPU of a local station, check the following items.
Check item
Is the daylight savings time set to CPU modules different between the
master station and local stations?
Has the clock data been changed by the clock function of the CPU
module?
Action
Set the same daylight savings time to the CPU modules of the master station and
local stations.
Check whether the clock data has been changed by the clock function of the CPU
module.
4 TROUBLESHOOTING
4.4 Troubleshooting by Symptom
4
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