8 Communication
8.4 IEC 61850
181
SICAM I/O Unit, 7XV5673, Device Manual
E50417-H1040-C484-A3, Edition 05.2012
When is the time quality bit "Clock failure"
set?
At faulty internal clock or failure of the synchronization
source (SNTP, field bus) or RTC failure
When is the time quality bit "Clock not syn-
chronised" set?
After a waiting period, time quality is set to
ClockNotSynchronized and ClockFailure
Is the timestamp of a binary event adjusted to
the configured scan cycle?
No
Does the device support time zone and day-
light saving?
Yes
Which attibutes of the NTP response packet
are validated?
Leap indicator not equal to 3?
Yes
Mode is equal to SERVER
No
OriginateTimestamp is equal to value
sent by the SNTP client as
TransmitTimestamp
No
RX/TX timestamp fields are checked for
reasonableness
Yes
SNTP version 3 and/or 4
No
Other (describe)
No
Table 8-22
PIXIT for Time and Time Syncronization Model (cont.)
Description
Value/Clarification
MAN_SICAM_IO-Unit_7XV5673_US.book Page 181 Thursday, May 10, 2012 10:59 AM