ABB RELION REX640 Technical Manual page 125

1MRS759142 F
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.
DNP3, Modbus, IEC 60870-5-101/104 and IEC 60870-5-103
For legacy protocols as synchronization source, a timeout can be set by
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.
3.6.1.3 Signals
Table 50: GNRLLTMS Output signals
Name
ALARM
WARNING
EXTCLKMSTR
Table 51: SNTP Output signals
Name
ALARM
WARNING
EXTCLKMSTR
REX640
Technical Manual
IRIG-B time synchronization requires a COM module with an IRIG-B
input.
Legacy protocols as time synchronization sources do not offer the best
accuracy. For better accuracy PTP, SNTP or IRIG-B time synchronization is
recommended.
Type
BOOLEAN
BOOLEAN
BOOLEAN
Type
BOOLEAN
BOOLEAN
BOOLEAN
Description
Alarm status for clock synchronization Al-
Synch source set to "None".
ways FALSE with
Warning status for clock synchronization Al-
Synch source set to "None".
ways FALSE with
Status of the protection relay's clock syn-
chronization Always FALSE with
set to "None".
Description
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 status for clock synchronization
TRUE if the connection to SNTP primary serv-
er has been lost. Otherwise FALSE.
Status of the protection relay's clock syn-
chronization.
TRUE if the protection relay has been
synchronized by an SNTP server.
Basic functions
Time
Synch source
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