China: CST-8
Japan: JST-9
Syntax for the time zone description
In order to synchronize with a different time zone, the following syntax applies:
tz offset dst,Mmwd,Mmwd
Syntax (obligatory):
tz offset Time zone and difference from UTC:
West of the zero meridian, the difference must be added; east of the zero
meridian, the difference must be subtracted.
Syntax (optional, only if there is daylight saving time):
dst,Mmwd,Mmwd Daylight saving time zone with beginning and end
m (1 ≤ m ≤ 12) m: Month
w (1 ≤ w ≤ 5) w: Week of the month, i.e. w = 5 is the last week of the month
d (0 ≤ d ≤ 6) d: Day of the week (from 0 = Sunday to 6 = Saturday)
PLCTimeType
This variable specifies the type of time that the PLC clock has been set to:
● local-nodst stands for local time without daylight saving time, even if the time zone
defines daylight saving time. In summer, all clocks are 1 hour behind the normal time, but
as a consequence there are no time steps. If the PLC clock is inadvertently set to daylight
saving time, then the Linux clock advances by 1 hour.
This behavior was used until this variable was introduced, and for compatibility reasons, it
still remains the default setting.
● local b means local time with changeover to daylight saving/standard time if in the
corresponding time zone there is daylight saving. If Linux takes its time from an external
server, then with this setting, the PLC clock is changed over twice a year.
NOTICE
Time of day alarms of the PLC missing or are duplicated
If Linux takes its time from the PLC, then this must either be manually or automatically
changed over externally between daylight saving time and standard time. If this is not
done, then in summer, the Linux clock is back 1 hour.
● utc means that the PLC clock is set to universal time. This makes it easy to align the time
as also the Linux clock is internally set to UTC. For this setting, there are no time changes
as UTC never has daylight saving time. However, neither SINUMERIK Operate nor the
engineering tools of the PLC know this mode or support converting UTC into local time, so
that in most cases, a time differing from the normal time is displayed.
Value: local-nodst, local or utc
Default: local-nodst
Configuring the system
2.3 Configuration file "basesys.ini"
NCU operating system
Commissioning Manual, 12/2017, 6FC5397-1DP40-6BA1 27
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