Siemens SICLOCK TC 400 Manuel de service télécharger pdf (Page 12)

Fundamentals

2.3 Time displayed in PCS 7

Time synchronization (V7.1)

12 Function Manual, 03/2009, A5E01216578-01

2.3 Time displayed in PCS 7

Coordinated Universal Time (UTC)

Coordinated Universal Time (UTC) is an international time basis that takes as its precedent

the precision of atomic clocks. UTC refers to the Greenwich prime meridian in London.

UTC does not take daylight saving time into account.

Local time

East of the prime meridian, one or more hours is added to the universal time measured in

Greenwich, depending on the distance in question. West of the prime meridian, the hours

are subtracted.

The following table shows some examples of time zones and their time differences in relation

to UTC:

Location Time zone Zone time Time

Greenwich 0. Longitude UTC = Coordinated Universal Time UTC 12:00

Berlin 15. Eastern longitude CET = Central European Time UTC + 1h: 13:00

Moscow 45. Eastern longitude MSK = Moscow Time UTC + 3h: 15:00

Tokyo 120. Eastern longitude JST = Japan/Korea Standard Time UTC + 9h: 21:00

Buenos Aires 45. Western longitude No designation UTC – 3h: 9:00

Daylight saving time/standard time

A number of countries have introduced conversion of standard time (local time) to daylight

saving time for the summer months.

Example:

In central Europe, standard time differs by plus one hour, while daylight saving time differs

by plus two hours in relation to standardized universal time (UTC).

UTC CET standard time CEST daylight saving time

12:00 UTC + 1h = 13:00 UTC + 2h = 14:00

Time display in process mode

In PCS 7, the operator can toggle the time displayed on the operator station between UTC

and local time while the plant is in process mode. The operator station can display the local

time, including daylight saving time and standard time.

Note

If time-dependent data of different time zones is displayed or processed on a PCS 7

component, then use UTC for display on the operator station as well.

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Siemens SICLOCK TC 400 Manuel de service Page 12