GE Industrial Solutions Entellisys 4.0 System Administrator Manual - Manual (Page 27)

Troubleshooting 27
5
Solution: There are many different reasons that this could occur.
For single lineups: Verify that the IP address for the time server matches one of the CPUs
For multiple lineups coupled with closed circuit networks without a VPN:
• Verify that the IP addresses for each CPU and HMI are unique
• Verify that CPUs or HMIs can be pinged from either lineup
• Verify that the IP address entered matches the IP address entered on the “Master
HMI” on the “Master Lineup”
For multiple lineups coupled with closed circuit networks with a VPN:
• Follow the same checklist for closed circuit networks without a VPN (above)
• Verify that port 123 is allowed in all VPNs
Condition: The event log shows time differences between HMI and CPU events
Problem: The HMI and CPU time clocks are different
Solution:
• On all HMIs: Verify that the time zones are all correct
• On all HMIs (except the “Master HMI”): Verify that the “Enable HMI Time
Synchronization” is checked
• Restart the “Master HMI” and navigate to the Time Synchronization tab (Main Menu,
Maintenance) and click the “Update Now” button
Condition: An HMI is not synchronized with the time server
Problem: The Windows Service may not be configured with the correct time server
Solution: Go to the Time Synchronization tab (Main Menu, Maintenance) and verify the correct IP
address and click the Apply button