Eaton EMR-3MP0 Installation, Operation And Maintenance Manual page 127

Modbus TCP
Hardware Interface
RJ45 (Ethernet)
DNP3
Hardware Interface
RS485 or RJ45 (Ethernet)
Accuracy of Time Synchronization
The accuracy of the device's synchronized system time depends on several factors:
• Accuracy of the connected time generator;
• Synchronization protocol that is used; and
• If Modbus TCP, SNTP or DNP3 TCP/UDP is used: Network load and data package
transmission times
Please consider the accuracy of the used time generator. Deviations of the time
generator's time cause the same deviations on the device's system time.
Selection of Timezone and Synchronization Protocol
The protection relay masters both UTC and local time. This means that the device can be
synchronized with UTC time while using local time for user display.
Time Synchronization with UTC time (recommended):
Time synchronization is usually done using UTC time. This means for example that an
IRIG-B time generator is sending UTC time information to the protection relay. This is the
recommended use case, since here a continuous time synchronization can be ensured.
There are no "leaps in time" through change of Daylight Saving Time.
To achieve that the device shows the current local time, the timezone and the change to
Daylight Saving Time (i. e. the change between summer- and wintertime) can be
configured.
Please carry out the following setting steps in the menu branch [Device Para / Time /
Timezone]:
• Set the parameter »Time Zones« to your local timezone.
EMR-3MP0
Recommended Application
Limited recommendation when Modbus TCP
communication protocol is used and when no IRIG-B real
time clock or an SNTP server is available.
Recommended Application
Limited recommendation when using the DNP3
communication protocol and no IRIG‑B real time clock or
an SNTP server is available
NOTICE!
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3 Communication Protocols
3.7 Time Synchronization
127