Technical data

Fundamentals
2.5 Central plant clock
Time synchronization (V7.1)
16 Function Manual, 03/2009, A5E01216578-01
2.5 Central plant clock
Using a central plant clock
You should always synchronize all Process Control Systems using either a precise time or a
standard time. In the case of PCS 7 plants, we recommend performing synchronization by
means of a central plant clock. The central plant clock manages the time centrally for the
entire plant and synchronizes all of the other plant components via their interfaces.
Recommendation:
Using the SICLOCK TC 400 as the central plant clock. The SICLOCK should be
synchronized with a standard time, e.g. using GPS or DCF 77, as this ensures that a correct
reference to the actual time is constantly available.
Standard time
The following standard times are typical for PCS 7 plants:
● GPS
The GPS signal is provided by a global satellite system.
● DCF 77
The DCF 77 signal is available in Germany and in certain parts of Europe using
corresponding radio signal receivers.