IRIG-B
IRIG-B time synchronization requires IRIG-B format B00x and IRIG-B time code
extensions according to IEEE Std C37.118.1TM-2011. The extensions are defined by
Annex D.
The synchronization time in IRIG-B can be either UTC time or local time. As no
reboot is necessary, the time synchronization starts immediately after the IRIG-
B synchronization source is selected and the IRIG-B signal source is connected.
GNRLLTMS signals reflect the signal status from the IRIG-B master.
IRIG-B time synchronization requires a COM module with an IRIG-B
input.
DNP3, Modbus, IEC 60870-5-101/104 and IEC 60870-5-103
For legacy protocols as synchronization source, a timeout can be set by
Time
Syn Src Tmm
(minutes). This setting defines the maximum interval required
by the protocol master sending the time synchronization commands. If a time
synchronization command has not been received from the protocol master during
this period, bad synchronization status is raised for the protection relay.
Legacy protocols as time synchronization sources do not offer the best
accuracy. For better accuracy PTP, SNTP or IRIG-B time synchronization is
recommended.
3.6.1.3 Signals
Table 50: GNRLLTMS Output signals
Name Type Description
ALARM BOOLEAN Alarm status for clock synchronization Al-
ways FALSE with
Synch source
set to "None".
WARNING BOOLEAN Warning status for clock synchronization Al-
ways FALSE with
Synch source
set to "None".
EXTCLKMSTR BOOLEAN Status of the protection relay's clock syn-
chronization Always FALSE with
Synch source
set to "None".
Table 51: SNTP Output signals
Name Type Description
ALARM BOOLEAN Alarm status for clock synchronization TRUE
if the connection to both primary and secon-
dary SNTP servers has been lost. FALSE if the
connection to the secondary SNTP server is
detected.
WARNING BOOLEAN Warning status for clock synchronization
TRUE if the connection to SNTP primary serv-
er has been lost. Otherwise FALSE.
EXTCLKMSTR BOOLEAN
Status of the protection relay's clock syn-
chronization.
TRUE if the protection relay has been
synchronized by an SNTP server.
1MRS759142 F Basic functions
REX640
Technical Manual
125
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