Siemens SICLOCK TC 400 - Manual (Page 18)

Description
2-16 © Siemens AG 2007 All Rights Reserved
SICLOCK ® TC 400
2.4 Time management
Various functions are available in SICLOCK TC 400 in order to generate the time
valid for the plant from the external synchronization. This includes setting options
for time zones as well as the parameterizable daylight saving time.
Time assurance through protected synchronization
If a discontinuity of more than 5 s occurs in the external synchronization, the pro-
tected synchronization is activated and, for safety reasons, the synchronization
not performed.
Time assurance through microstepping mode
A time difference between the external synchronization and the device, which can
occur through a temporary radio failure or switchover to a substitute synchroniza-
tion, is automatically cleared unnoticeably in microstepping mode for the plant
operation. There is no inconsistency in the time.
Further information and parameterization options for protected synchronization
and the microstepping mode are described in Section Synchronization
(Section 9.3.2).
2.5 Commissioning
The commissioning can be divided into the following steps:
1. Installation (Section 5)
2. Connecting (Section 6)
3. Assigning IP address on the device
Parameterization and Operation on the Device (Section 8)
4. Parameterization (Section 9)
With a few exceptions, the settings are made with the configuration tool, see
Configuration Tool (Section 7).
Note
Only parameterize the plant time at one location within the synchronization hier-
archy, ideally at the plant central clock.