Time Protocols; Real-Time Clock; Ieee 1588 Precision Time Protocol (Ptp); Ptp Status - GE 869 Communications Manual

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Digital Energy
869 Motor Protection System
Chapter 3: Time Protocols

Real-time Clock

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IEEE 1588 Precision Time Protocol (PTP)

PTP Status

869 MOTOR PROTECTION SYSTEM – COMMUNICATIONS GUIDE

Time Protocols

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Setpoints > Device > Real Time Clock
The 869 is capable of receiving a time reference from several time sources in addition to its
own internal clock for the purpose of time-stamping events, transient recorders and other
occurrences within the relay. The accuracy of the time stamp is based on the time
reference that is used. The 869 supports an internal clock, SNTP, IRIG-B, and PTP IEEE 1588
as potential time references.
If two or more time sources are available, the time source with the higher priority shown in
Time Sources table is used where 1 is considered to be the highest priority. Please note
that the time source priority of PTP and IRIG-B can be swapped. If both PTP and IRIG-B are
available to the 869, by default the 869 clock syncs to PTP over IRIG-B. If PTP is not
available the 869 CPU syncs the internal clock to IRIG-B.
Table 3-1: Time Sources
Time Source
PTP (IEEE1588)
IRIG-B
SNTP
Internal Clock
* The priority of IRIG-B and PTP can be swapped.
Synchronization by IEC103, DNP, Modbus and IEC104 is not going to be issued if there is a
sync source from IRIG-B, SNTP or PTP.
The present values of the PTP protocol are displayed here.
Priority
1*
2*
3
4
3-1