Product specifications

History Configuration
3BDS011222-510 B 343
not changed. Max Time set to zero means that there is no sampling if the
input changes are less than the Exception Deviation. In all other cases
Max Time must be greater or equal to Min Time.
Setting a Max Time also enables the trace knee functionality. When a new
point is received an extrapolated point is inserted just before the new
point, having the same value and quality as the previous point and the
timestamp is set to minTime (or updateRate) before the new point. This is
only done under the following condition:
– The time span between the new and previous point must be longer than
traceKneeConstant * minTime and the values or the qualities of those
points must also differ.
The traceKneeConstant is stated in the registry (default 3) and the
minTime is taken from the Log Configuration aspect. If no log exists, the
update rate of the trend is used instead of the minTime.
The result of this functionality is represented in the figures given below:.
Set Max Time greater than 2*Min Time for minimum storage capacity time to
be guaranteed.
Figure 211. Max Time Set / No Max Time Set