M
ULTI
-S
OURCE
S
YSTEM
- G
ENERAL
Multi-Source Function System 7001RC - V02.01
7 / 31
hopf
Elektronik GmbH
Nottebohmstr. 41 • D-58511 Lüdenscheid • Tel.: +49 (0)2351 9386-86 • Fax: +49 (0)2351 9386-93 • Internet: http://www.hopf.com • E-Mail: [email protected]
1
Multi-Source System - General
A multi-source system makes it possible to create a clock system that can select between
various synchronisation sources (sync. sources), independent of their respective status. For
this purpose, all available sync. sources are evaluated and monitored.
Different priorities are assigned by the user to the various sync. sources (primary, secondary
etc.). These priorities define the synchronisation source that will be preferred when sources
have the same status.
The system will be synchronised and controlled by the primary source for as long as this
source has the status "Sync". In the event that the primary source reverts to "Quartz" or
"Invalid" status, the system automatically switches for synchronisation to the secondary
source – provided that this source has the synchronisation status "Sync".
The systems that are connected to the clock system are not able to recognise which source
is being used for synchronisation. These systems are only able to recognise, from the type of
signal emitted by the clock system, whether the clock system is synchronised or is running in
internal quartz mode.
The internal quartz mode of the clock system is only used as the time base when there is no
synchronisation source (sync. source) with "Sync" status available. In this case the clock
system status is output as "Quartz".
Switching between the various sync. sources generally takes place automatically but can
also be done manually.
1.1 Functional Schematic of a Multi-Source System
Different priorities are assigned to the sources Q1 ... Qx (primary, secondary etc.). The
system time and date are defined from the time and status information of the primary source.
In addition, the time and status information of the other sources is evaluated and monitored;
however this data is not used to synchronise the system. The synchronisation status of the
respective source is reported via the system such that, in the event of the failure of the
primary source, the user or the system can switch over to the next synchronous source.
Diagram: Schematic of a multi-source system
Q1
Qx
Q2
Evaluation: Time
Status
Source switchover
Error message
Current
source
Clock time
Control of internal
quartz base
Additional information
Source type
Source time base
•
Local time, UTC, ...
•
ST/WT changeover
•
Switch second
Output
Source priority
