Glossary - Siemens SIMATIC PCS 7 Function Manual

Glossary

CEDST
Central European Daylight Saving Time
Central plant clock
An central plant clock receives a time signal from an external clock and transfers it to the
terminal bus or the plant bus.
CET
Central European Time
Clock, external
External clocks synchronize a plant with the aid of externally received time signals, e.g. the
radio signal DCF77 or the satellite based GPS signal.
Cooperative time master
A cooperative time master takes over the role of time master only when it no longer receives
time signals from the active time master.
DCF 77
Radio reception of the atomic clock in Braunschweig for operation in central Europe
Domain controller
A domain controller is a server that regulates and manages the authentication and
authorization of the computers and users.
GMT
Greenwich Mean Time
GPS
Global Positioning System
Local time
The local time is actual time in the respective time zone.
Time synchronization (V8.0)
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