Technical data

Fundamentals
2.8 Network environment of a PCS 7 plant
Time synchronization (V7.1)
Function Manual, 03/2009, A5E01216578-01
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2.8.3 Network environment within a domain
Central plant clock
The SICLOCK TC 400 is particularly suitable for operation as a central plant clock within a
domain, as the SICLOCK has four independent Ethernet interfaces.
Structure
The following figure illustrates the recommended configuration for a PCS 7 plant in a
Windows domain with a central time clock:
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Time synchronization in a domain
The time is synchronized within a domain as follows:
● Time synchronization via plant bus
The plant bus is synchronized using the SICLOCK TC 400.
The synchronization mode depends on the CPU type used (with/without integrated
Ethernet interface).
● Time synchronization via terminal bus
The domain controllers are synchronized directly by the central plant clock using NTP
mode.
The domain controllers synchronize all domain members using the NTP method.