Siemens siprotec 7SD5 User Manual page 576

4 Technical Data
Resolution for fault events
Buffer battery
Commissioning Tools
Operational Measured Values
Switching device test
Clock
Time Synchronization
Operating modes of the clock management
No. Operating mode
1 Internal
2 IEC 60870-5-103
3 GPS synchronization
4 Time signal IRIG B
5 Time signal DCF 77
6 Time signal synchro-box
7 Pulse via binary input
576
1 ms
Type: 3 V/1 Ah, Type CR 1/2 AA
self-discharging time approx. 10 years
DCF 77/IRIG-B-Signal (telegram format IRIG-B000)
Binary Input
Communication
Explanations
Internal synchronization via RTC (default)
External via system interface (IEC 60870-5-103)
External synchronization using GPS interface
External synchronization via IRIG B (telegram format
IRIG-B000)
External synchronization via DCF 77
External synchronization using SIMEAS Sync. box
External synchronization with pulse via binary input
7SD5 Manual
C53000-G1176-C169-1