Siemens Simatic RTU303xC Series Operating Instructions Manual page 117

Local time zone
● Time Zone
Set the time zone in which the RTU is located either by entering it manually or selecting
an entry from the drop-down list.
● Automatic daylight saving time switch
If you sent the time zone manually, you can enable the automatic changeover of daylight
saving time and standard time and set the parameters for this.
● Enable time-of-day synchronization
By enabling the option, you enable synchronization of the RTU time of day.
The time of day is synchronized each time the RTU changes to communication mode.
As an option, at the bottom of this WBM page you can set the time of day of the RTU
manually or adopt it from the configuration PC.
Time-of-day synchronization
● Active
Enable the option if the time of day of the RTU is to be synchronized.
● Synchronization method
You can enable synchronization of the RTU time of day according to one of the following
methods:
– NTP
– GPS (RTU3031C)
– By mobile wireless network
– By telecontrol master station
RTU303xC
Operating Instructions, 06/2019, C79000-G8976-C382-06
The RTU supports the SNTP (Simple Network Time Protocol) method.
If you want to use this option, make sure that the specified NTP server can be reached
via the relevant interface.
The time-of-day synchronization method SNTP with which you access a time-of-day
server in the network can also be used with OpenVPN.
RTU3031C can receive the highly precise time via GPS satellites.
The RTU adopts the time of day from the mobile wireless network.
The RTU supports the NITZ (Network Identity and Time Zone) service on the wireless
interface. Check with your network provider to find out whether this function is
supported in your mobile wireless network.
The RTU adopts the time of day from the communications partner (telecontrol server
or master).
Configuration (WBM)
4.10 System
117