Configuration
4.4 Time-of-day synchronization
CP 1243-1
42
Operating Instructions, 04/2017, C79000-G8976-C365-03
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Port number of the listener port of the master
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DNS server address(es)
You require the DNS server address if you address the master using a name that can be
resolved by DNS.
Configurations with connections over the Internet: VPN connections
For connections running via the Internet, dynamic IP addresses can be used.
To allow communication in both directions and to ensure that the data is protected during
transfer, a connection with a VPN tunnel is necessary. For this the security modules of the
SCALANCE S or SCALANCE M series are available.
Remember the following points when configuring:
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You configure the master IP address as normal.
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When configuring the CP interface, configure the IP address of the router.
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You create the VPN configuration with SCALANCE S/M both for the station end and for
the control center end in STEP 7.
4.4
Time-of-day synchronization
Synchronization method of the CP
Note
Time-of-day synchronization of the CP
With applications that require time-of-day synchronization (e.g. telecontrol), you need to
synchronize the time of day of the CP regularly. If you do not synchronize the time of day of
the CP regularly, there may be deviations of several seconds per day in the time information
of the CP.
With security functions enabled, you need to enable time-of-day synchronization.
Note
Recommendation for setting the time
Synchronization with a external clock at intervals of approximately 10 seconds is
recommended. This achieves as small a deviation as possible between the internal time and
the absolute time.
