Mitsubishi Electric Q26UD(E)HCPU User Manual page 294

(4) Clock data cannot be set by SNTP
If the clock data cannot be set by SNTP, refer to the following.
The time setting function does not operate. (Check "Ethernet
Diagnostics" or the special register (SD1270).)
The time setting is failed. (Check "Ethernet Diagnostics" or
the special register (SD1270).)
For the multiple CPU system: CPU module for which the time
is set is not No. 1.
The CPU module parameter is not normal.
The time is overwritten from a program or another device.
If the clock data cannot be set by SNTP even after taking the above actions, the possible cause is a failure of the
connected device.
Check the items described in
292
Check item
Page 290, Section 15.3.4 (3).
Corrective action
Check the following on the time setting function.
• SNTP is set to be used.
• Input of the SNTP server IP address is correct.
• Input of each executing condition is correct.
• Input of a time zone is correct.
• Make sure the CPU parameter is normal.
• Make sure the specified SNTP server operates normally.
Set the time for the CPU module No. 1.
Correct the parameter.
Remove overwriting from a program or another device.