Siemens SICLOCK TC 400 Operating Instructions Manual page 129

Volatile parameters
Volatile parameters are parameters containing values/states that continuously
change during operation.
Time synchronization
The time of all plant components, automation units and computers is adjusted
exactly to the reference time of the plant central clock via time synchronization.
Time synchronization of plants
The term Time synchronization of plants is always used to describe when several
components of a plant are synchronized with products of the SICLOCK range.
Zone time
The zone time is the zone time derived from UTC.
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SICLOCK TC 400
Glossary
D-127