14 SNTP
SNTP is used to synchronise the clocks of computer systems over packet-switched, variable-latency data
networks, such as IP. SNTP can be used as the time synchronisation method for models using IEC
61850
over Ethernet.
The device is synchronised by the main SNTP server. This is achieved by entering the IP address of the
SNTP server into the IED using the IEC 61850 Configurator software described in the S1 Agile chapter. A
second server is also configured with a different IP address for backup purposes.
The HMI menu does not contain any configurable settings relating to SNTP, as the only way to configure it is
using the IEC 61850 Configurator. However it is possible to view some parameters in the
COMMUNICATIONS column under the sub-heading SNTP parameters. Here you can view the SNTP server
addresses and the SNTP poll rate in the cells SNTP Server 1, SNTP Server 2 and SNTP Poll rate
respectively.
The SNTP time synchronisation status is displayed in the SNTP Status cell in the DATE AND TIME column.
MiCOM P747 Chapter 7 - SCADA Communications
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