GE Industrial Solutions Entellisys 5.0 Administrator Manual - Manual (Page 33)

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6
6 Time synchronization
In the Entellisys System, events are generated by both the HMI and the CPU. When deciphering
the event log, it is desirable that the date/time of all Entellisys devices are set from the same
time reference. SNTP (Simple Network Time Protocol) is used to synchronize any number of
Entellisys lineups. All systems must be networked together - either through the building LAN or
through an isolated network.
Factory Default
Time Synchronization is not configured - See section 6.2 through 6.4 to configure
Synchronizing across multiple lineups
Additional lineups can be networked together and configured to reference the same time
server. (See section 6.3)
It is possible to use another time server provided that:
• The Time Server supports passive SNTP
• The Time Server is connected to the HMI - CPU router
NOTE: If Entellisys is connected to the building LAN, a VPN must be used to prevent unwanted
traffic on the Entellisys network.
Events
Time Server not Configured - logged when IP address of time source is set as 0 (initial
condition).
Time Server Started - logged when time server is started at CPU and this CPU will be the
synchronization point for all other devices.
Time Server Stopped - logged when time server is stopped at CPU.
Time Server Synchronization Successful - logged when CPU or HMI received it's first
synchronization message for the time server. It is logged only on the first successful reception of
synchronization message from the time server. As long as there were no time synchronization
issues, this event will not be logged again.