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10 Time Synchronization
10.4 External Time Synchronization via Fieldbus
304
SICAM Q100, 7KG95xx, Device Manual
E50417-H1040-C522-A4, Edition 03.2018
In these cases, SICAM Q100 is not external synchronized anymore. The device uses the internal clock (on mil-
liseconds time basis) and the last valid drift. After the programmable time delay, the device reports "Clock Er-
ror", see chapter 14.
Switching Back from the Secondary to the Primary NTP Server
While the device is synchronized by the secondary NTP server, it continues to cyclically poll the primary NTP
server. The device will only switch back to the primary NTP server if it receives correct time information and if
none of the criteria for
are fulfilled anymore.
10.4
External Time Synchronization via Fieldbus
The external time synchronization via fieldbus is used if the device is connected to the systems control via pro-
tocol
Modbus RTU
using the RS485 interface.
The time information can also be transmitted from the systems control via
Modbus TCP
or
IEC 61850
using
Ethernet interface. When using the Ethernet connection, Siemens recommend, however, to synchronize the
device from an NTP server, see chapter 10.3.
When using the external time synchronization via fieldbus, the client should send a message containing the
time information to the device in 1-minute cycles.
The time synchronization error using the
Modbus RTU
protocol is ±20 ms max.
10.5
Internal Time Synchronization via RTC
Besides external time synchronization, the internal time synchronization is also possible using the battery-buff-
ered RTC (Real Time Clock). Due to the reduced accuracy, RTC should only be used in case of failure or un-
availability of the external time synchronization.
NOTE
Chapter 2 of the system manual SICAM Q100 7KG95xx, order number E50417-C1040-C522, provides infor-
mation on the data format.
NOTE
Chapter 2 of the system manual SICAM Q100 7KG95xx, order number E50417-C1040-C522, provides infor-
mation on the data format.
NOTE
Chapter 2 of the system manual SICAM Q100 7KG95xx, order number E50417-C1040-C522, provides infor-
mation on the data format.
Содержание SICAM Q100
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Страница 88: ...5 Energy Management 5 2 Tariffs 88 SICAM Q100 7KG95xx Device Manual E50417 H1040 C522 A4 Edition 03 2018 ...
Страница 102: ...6 Getting Started 6 7 Commissioning 102 SICAM Q100 7KG95xx Device Manual E50417 H1040 C522 A4 Edition 03 2018 ...
Страница 332: ...13 Technical Data 13 3 Dimensions 332 SICAM Q100 7KG95xx Device Manual E50417 H1040 C522 A4 Edition 03 2018 ...
Страница 370: ...15 Operating Parameters 15 6 Administrative 370 SICAM Q100 7KG95xx Device Manual E50417 H1040 C522 A4 Edition 03 2018 ...