Table 13: Synch accuracy values and corresponding accuracies
Bits Accuracy
21 0.5 µs
20 1 µs
19 2 µs
18 4 µs
17 8 µs
11 0.5 ms
10 1 ms
9 2 ms
8 4 ms
7 8 ms
1 0.5 s
0 1 s
The time synchronization accuracy is rounded to the next worse
accuracy, for example, if the accuracy is 2..3 ms, it is shown as 8 bits
(4 ms).
IEEE 1588 v2 monitoring values
The IEEE 1588 v2 monitoring values are found via menu path Monitoring/IED
status/Time synchronization/IEEE 1588.
Table 14: IEEE 1588 v2 monitoring values
Description
Value
Grandmaster Identity
Grandmaster time src Atomic clock
GPS
Terrestrial radio
PTP
NTP
Hand set
Other
Internal oscil.
Grandmaster accuracy
Within a domain, grandmaster is the clock that is the ultimate source of time for clock
synchronization using the PTP protocol.
Grandmaster identity indicates the identity of the master clock.
Section 6 1MRS757809 C
Process bus and IEEE 1588 time synchronization
76 REC615 and RER615
Engineering Guide
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