Technical data

Fundamentals
2.8 Network environment of a PCS 7 plant
Time synchronization (V7.1)
30 Function Manual, 03/2009, A5E01216578-01
Time synchronization in redundant, high-availability networks
The time is synchronized as follows:
● SICLOCK supplies the exact time.
● The domain controller, terminal bus, and plant bus are synchronized by means of the
SICLOCK.
● The domain controllers act as time masters.
● The OS servers actively fetch the time from the domain controller.