Name Type Description
FALSE if the clock has not been synchronized
by an SNTP server.
Table 52: IEEE 1588v2 Output signals
Name Type Description
ALARM BOOLEAN
Alarm status for clock synchronization.
TRUE if the current master’s accuracy is not
within 1μs or priority1 is bigger than that of
first secondary’s. Also TRUE if the external
master was lost and the protection relay it-
self acts as a master. Otherwise FALSE.
WARNING BOOLEAN
Warning status for clock synchronization.
TRUE if a previously connected and stored
primary master 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 external master.
FALSE if the clock has not been synchronized
by an external master.
Table 53: IRIG-B Output signals
Name Type Description
ALARM BOOLEAN
Alarm status for clock synchronization.
TRUE if the signal has been lost for a minute.
Otherwise FALSE.
WARNING BOOLEAN
Warning status for clock synchronization.
TRUE if the signal connection is lost.
FALSE if the relay is synchronized to an IRIG-B
master.
EXTCLKMSTR BOOLEAN
Status of the protection relay's clock syn-
chronization.
TRUE if the protection relay has been
synchronized to an IRIG-B master. Otherwise
FALSE.
Table 54: DNP3, Modbus, IEC 60870-5-101/104 and IEC 60870-5-103 Output signals
Name Type Description
ALARM BOOLEAN
Alarm status for clock synchronization.
TRUE if the clock has not been synchronized
by the master.
Table continues on the next page
Basic functions 1MRS759142 F
126 REX640
Technical Manual
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