Hello,
I am facing an issue with PLC time synchronization with the server.
The PLC time is consistently about 24 minutes behind the server time. The server is configured in the GMT+1 time zone.
Could you please advise if any configuration setting is missing or needs to be changed?
I have attached screenshots of the SDM and PLC configuration settings for reference.
A 24-minute offset doesn’t match any standard timezone difference, so this is almost certainly a sync failure rather than a timezone misconfiguration. The PLC is likely running on its internal clock which has drifted.
Two additional things worth checking:
Network Connectivity – Make sure the PLC can reach the NTP server. If a firewall is blocking this traffic, the NTP client will silently fail to synchronize, and the PLC will continue running on its internal clock, which can drift significantly over time.
Logger – In Automation Studio, go to Online → Logger and look for entries related to time changes. If NTP is synchronizing successfully, you will see log entries confirming it. If there are no such entries, it means synchronization is not occurring — which would explain the 24-minute drift.
Hello,
Are the PLC and NTP server in the same network? If not, is the Ethernet parameters-Default gateway set? This has solved a time synchronization issue in the past for our customer.
Hi,
last but not least, the stratum of a NTP server has to have a minimum accurancy setting so that the PLC accepts time synchronisation with this server.
Please see the following post for more details, including a link to the stratum information:
Best regards!
Yes. Firewall was blocking this connection.
Also, Got logger entry now
so problem is solved now, right?
