GE C70 Instruction Manual page 189

5 SETTINGS
changed from the front panel or from communications protocols. A setting of PP/IRIG-B/PTP/SNTP, IRIG-B/PP/PTP/SNTP,
or PP/PTP/IRIG-B/SNTP causes the relay to track the first source named that is enabled and operational, or free-run if
none of these are available. Here, PP means a time source that is strictly compliant with PP, and PTP means a time source
that is not strictly compliant with PP. When a time source fails or recovers, the relay automatically transfers synchronization
as required by this setting.
When the relay does not have the IEEE 1588 software option and this setting does not display, it uses IRIG-B when
, then failing that SNTP when configured and operational,
enabled and operational
clock is changed from the front panel or from communications protocols.
Whenever a time synchronization message is received through any of the active protocols, the UR clock updates. However,
given that IEC 60870-5-103, IEC 60870-5-104, Modbus, and DNP are low accuracy time synchronization methods, avoid
their use for synchronization when better accuracy time protocols, such as IRIG-B and PTP, are active in the system. If
IRIG-B or PTP is used to update the relay clock, the other protocols (such as SNTP) are not allowed to update, even if
active.
See the 
COMMANDS SET DATE AND TIME
The
REAL TIME CLOCK EVENTS
records the RTC time before the adjustment. A Date/Time Changed event is generated when:
• The real time clock changed from SNTP/PTP/IRIG-B and the time difference is more than one second
• The real time clock changed from the front panel or via Modbus register. The relay always generates this event regard-
less of the time difference.
• The Daylight Saving Time (DST) setting gets enabled and the current relay time is already in the DST zone
• The real time clock enters or leaves DST
To enable IRIG-B synchronization, the input
synchronization can be disabled by making this setting None.
To configure and enable PTP and/or SNTP, or to set local time parameters (for example time zone, daylight savings), use
the following sections.
b) PRECISION TIME PROTOCOL (1588)

PATH: SETTINGS PRODUCT SETUP
 PRECISION TIME
 PROTOCOL (1588)
MESSAGE
MESSAGE
MESSAGE
MESSAGE

PATH: SETTINGS PRODUCT SETUP
MESSAGE
MESSAGE
MESSAGE
GE Multilin
menu section of this manual to manually set the RTC.
setting allows changes to the date and/or time to be captured in the event record. The event
IRIG-B SIGNAL TYPE
 
REAL TIME CLOCK
STRICT POWER PROFILE:
Disabled
PTP DOMAIN NUMBER
0
PTP VLAN PRIORITY
4
PTP VLAN ID
0
 PTP PORT 1

 
REAL TIME CLOCK
PORT 1 PTP FUNCTION:
Disabled
PORT 1 PATH DELAY
ADDER: 00000 ns
PORT 1 PATH DELAY
ASYMMETRY: 0000 ns
C70 Capacitor Bank Protection and Control System
and otherwise it free-runs unless the
must be set to DC Shift or Amplitude Modulated. IRIG-B
PRECISION TIME PROTOCOL (1588)
Range: Enabled, Disabled
Range: 0 to 255
Range: 0 to 7
Range: 0 to 4095
PRECISION TIME PROTOCOL (1588)
Range: Enabled, Disabled
Range: 0 to 60 000 ns in steps of 1
Range: –1 000 to +1 000 ns in steps of 1
5.2 PRODUCT SETUP

PTP PORT 1(3)
5-65
5