Synchronization - Siemens SICLOCK TC 400 Operating Instructions Manual

Parameterization
Daylight saving time
The daylight saving time changeover is automatically performed by the device at
the parameterized times.
/Time/Advanced/Daylight Saving Time (0.09.07) parameter
Note
The preset changeover times correspond to the present valid regulations of the
European Community.
With the setting "enable = no", the time changeover is suppressed and the plant
is operated with standard time.
The calendrical regulation for the daylight saving time changeover can be speci-
fied worldwide via a parameter.
Leap seconds
Use the /Time/Advanced/Leap Seconds[20] (0.09.05) parameter to specify the
calendar of leap seconds.
9.3.2

Synchronization

Synchronization status
You can read out different information about the current synchronization status
via the /Synchronization/Status of Synchronization (0.09.09) parameter.
Protected synchronization
If a discontinuity of more than 5 s occurs in the external synchronization, the pro-
tected synchronization is activated. The synchronization is suppressed and an
alarm issued which is present as long as there is a discontinuity in the external
synchronization.
The pending synchronization suppression can be ignored once and the "Pro-
tected synchronization" alarm cleared with the parameter entry /Synchroniza-
tion/Advanced/Protected Synchronization/ignore /clear alarm (0.09.12) = "yes".
Notice
This initiates an unconditional synchronization to the external time and an incon-
sistency in the time distribution to the plant can result.
If required, disconnect the active external synchronization first or delete the server
address for the NTP client operation from the /NTP Client/NTP Server List[4]
(0.18.02) parameter.
9-84
© Siemens AG 2007 All Rights Reserved
SICLOCK
®
TC 400