Compensation of runtime deviations
To
compensate for deviations between the SIMOTION and SINAMICS clocks, the time of day
is automatically synchronized at regular intervals.
The following behavior must be taken into consideration when setting the SIMOTION time:
● "Time/date to be set" is after "Time/date on SINAMICS": Time and date are corrected on
the SINAMICS.
● "Time/date to be set" is before "Time/date on SINAMICS": The SINAMICS clock must be
stopped until the SINAMICS "Time/date" has caught up with "Time/date to be set".
Adopting this procedure ensures that the sequence of SINAMICS diagnostic buffer entries
remains the same, even when the runtime differences are aligned.
The SINAMICS clock operates with a resolution of 1 ms. A synchronization accuracy of 1 ms
can be achieved for all bus cycle clocks that can be divided exactly by 1 ms (e.g. 1 ms, 2 ms,
3 ms, etc.).
Due to system considerations, a slightly lower synchronization accuracy is achieved for all bus
cycle clocks that cannot be divided exactly by 1 ms (e.g. 1.25 ms).
If the drive unit does not have an isochronous connection on SIMOTION, this can result in
runtime differences of milliseconds (depending on the set cycle clock ratios).
Resetting the time
Requirement:
● SIMOTION D410‑2: As of SIMOTION V4.3
● SINAMICS S120: As of SINAMICS V4.5
● SINAMICS S110: Not available
A threshold value is defined via parameter cu.p3109 and is effective as follows:
● In the case of negative time jumps less than the threshold value (p3109), the time is halted
(for details, see "Compensation of runtime deviations")
● In the case of negative time jumps greater than the threshold value (p3109), the time is
reset.
Default setting: cu.p3109 = 100 ms
This means that in the case of negative time jumps greater than 100 ms, the time is reset.
The default value is configured so that normal runtime deviations (drift of the quartzes) are
below the threshold value.
If the SIMOTION clock is reset by more than 100 ms, this is interpreted as a "specific reset
of the time" and the time of the drives is also immediately reset.
If the real-time clock is reset by more than 60 seconds, a diagnostic buffer entry is also made
in the drive:
Time correction (reset) by <correction value> seconds
After a resynchronization (negative time jump greater than the threshold value)
● cu.r3107[0..1] the UTC time after synchronization
● cu.r3107[2..3] the UTC time before synchronization
Commissioning (software)
7.4 Additional information on configuring the SINAMICS Integrated
SIMOTION D410-2
176 Commissioning and Hardware Installation Manual, 01/2015
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