Time Synchronization With Multi-Point Traffic - Siemens CP-8000 User Manual

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9.1.5.1.1 Time Synchronization with Multi-Point Traffic

The time is sent from a central station (time master) to CP-8000/CP-802x. The time master
must synchronize at least each 60 s, in order that the minimum resolution of 10 ms is
achieved. With failure of the time synchronization the target device records a warning in the
diagnosis after 10 min.
9.1.5.1.2 Time Synchronization with Dial-up Traffic
The time is sent from a central station (time master) to CP-8000/CP-802x. A synchronization
can be performed only upon setup of a connection.
9.1.5.1.3 Time Synchronization with Ethernet
SNTP/NTP Client
The settings for the (S)NTP client reside in the directory tree under
SICAM A8000 CP-80xx | Master module | Network settings | NTP/SNTP time synchroni-
zation client.
With communication according to IEC 60870-5-104 or IEC 61850, the time can be synchro-
nized via NTP or SNTP. To achieve that, you can enter the IP address of up to 4 NTP servers,
as well as the cycle time of the NTP synchronization.
For the time synchronization, the current NTP server is determined by "voting". This takes
place according to the following weighting:
·
Attainability
·
Stand-alone (NTP server does not receive a time)
·
Distance (with regard to the time)
A voting is performed after each 3-fold cycle time (parameter
mum voting time is 1 hour. Upon failure of the time synchronization the target device records a
warning in the diagnosis. With time synchronization via another automation unit (without NTP
server) the warning is recorded after 10 minutes.
The description of the parameters reside in the manual SICAM RTUs Common Functions Pro-
tocol Elements, chapter "LAN Communication (104)", section "Time Synchronization", as well
as chapter "LAN Communication (61850)", section "Time Synchronization".
336
Unrestricted
NTP cycle
SICAM A8000 / CP-8000 • CP-8021 • CP-8022 Manual
DC8-037-2.02, Edition 10.2017
time). The mini-