Siemens Plant Central Clock TC100 - Manual (Page 14)

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SICLOCK ® TC100 Operating Instructions
Description
2
Modern automation systems are made up of a multitude of computers, controllers
and systems, that exchange data with one another. In order to operate such sys-
tems in real time, it is absolutely essential to synchronize the clock times of all the
components involved. This particularly applies to error tracing if event messages
are time stamped, and cause and effect have to be identified by a reliable chro-
nological order.
As a central plant clock, SICLOCK TC100 supplies the various plant components
with a precise, reliable clock time, which is usually obtained from one or more
external synchronizations with official or statutory times of day, usually GPS or
DCF77 radio clocks.
SICLOCK TC100 distributes the time solely via Ethernet.
Note
Use one single device as the central clock for the whole plant, which supplies the
clock time to all the other devices.
Exception: Redundant operation of the central plant clock