Technical data
Fundamentals
2.8 Network environment of a PCS 7 plant
Time synchronization (V7.1)
28 Function Manual, 03/2009, A5E01216578-01
2.8.4 Network environment within a work group
Central plant clock
The SICLOCK TC 400 is suitable for operation as a central plant clock.
Structure
The following figure illustrates the recommended configuration for a PCS 7 plant in a work
group with a central time clock:
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Time synchronization in a work group
The time is synchronized within a work group as follows:
● Time synchronization via plant bus
The plant bus is synchronized using the SICLOCK.
The OS servers and the automation systems receive the time from the central plant clock.
These are time slaves.
● Time synchronization via terminal bus
The OS clients receive their time from an OS server. OS clients only receive the time
from those OS servers from which they also loaded the server data.