Configuring NTP Client Mode for a C Series Controller (C-Web Interface)
To configure an NTP server that the C Series Controller uses for time synchronization:
Click Configure, expand System, and then click NTP.
The NTP pane appears.
In the Create new list, select Server. Type an IPv4 or IPv6 address for the server, and click OK.
The Server pane appears.
Enter information as described in the Help text in the main pane, and click Apply.
If the remote system has authentication enabled, specify an authentication key and value. The system transmits the specified authentication key when transmitting packets.