GE Industrial Solutions Entellisys 4.0 System Administrator Manual - Manual (Page 26)

Time synchronization 26
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Figure 5-4 Time Sync w/ external SNTP time server
NOTE: GE cannot make any guarantees regarding time accuracy if the user decides to use a
3rd party SNTP time server OR uses a WAN or internet to connect two Entellisys systems.
Configuring Entellisys lineups to synchronize with external time source
In this configuration, neither a master HMI or Lineup are designated. Instead, each lineup
should configured as a “Client Lineup.”
1. All lineups must first be setup according to section 5.2 (This step must be done to ensure time zone
information is correctly written to lineup)
2. Network the lineups together (See Network considerations above)
3. At all lineups, verify that the “Synchronize Server’s Time Every 12 hours” control is unchecked on all local
HMIs
4. On all HMIs, navigate to the Time Synchronization tab (Main Menu, Maintenance) and
• Change, if necessary, the “Time Server IP Address” to match the 3rd party time server IP address (The
“Actual Time on Server” text box will NOT update)
• Verify that the “Synchronize Server’s Time Every 12 hours” control is unchecked on all local HMI’s
• Check the “Enable HMI Time Synchronization”
• Click the apply button (the apply button must be clicked to update the Windows Time Service with the
new time server)
5.5 Troubleshooting
Condition: After adding the time server IP address the actual address does not update with
the current time
Problem: The time server is either not available or not communicating