Technical data

13.1 Network Topology, Clock Master/Slave Functions
Within a SINEC L2 network, all the CP 5430 TF/CP 5431 FMSs can
execute clock functions. The aim is to achieve network-wide clock
synchronization.
The synchronization can be performed by
one
selected CP 5430 TF/CP
5431 FMS.
The station that transmits the clock synchronization frames is known as the
"clock master".
In this case, all other stations are "clock slaves".
The CP 5430 TF/CP 5431 FMS can take over the functions of the clock
master if programmed accordingly.
The transmission of clock frames can be selected within a range between 1
and 60 seconds. The value used by COM 5430 TF/CP 5431 FMS as the
default value is 10 s. This means that all slaves expect a synchronization
frame from the clock master after a maximum of 10 s. Otherwise, the clock
slaves attempt to take over the clock master function (only the highest
priority clock slave station is successful, provided this is programmed as
DYNAMIC CLOCK MASTER in COM 5430 TF/CP 5431 FMS).
The order of priority in which the stations take over the clock master
function is selected when the station address is assigned.
L2
CP 5430 TF
Station I
CP 5430 TF
Station II
CP 5430 TF
Station n
CP 5431 FMS
CP 5431 FMS
CP 5431 FMS
Fig. 13.2 Network Topology
C8976060/02 Clock Services
13 - 3 Volume 1