Product specifications

History Configuration
344 3BDS011222-510 B
There is no need to have a short Max Time value to get the "knee" at the
right place, since the added point is placed Min Time before the point
with the new value. For direct logs having hierarchical logs, the Max
Time should be set to a strictly lower value then the shortest Min Time of
the hierarchical logs.
Storage size can either be specified as number of Points stored in the log
or as the Time covered in the log. If the number of points is specified, the
time covered in the log will be calculated and displayed in the time edit
box. Max Capacity is an approximation of the Max Time multiplied with
the number of Points. Min Capacity is an approximation of the Min Time
multiplied with the number of Points.
– Exception Deviation area
Exception Deviation is the maximum input deviation that is allowed
without a new value is stored in the log. Notice that input will be stored to
the log at least as often as the time in Max Time specifies.
There are three different Exception Deviation types:
Absolute value:
For a new point to be added to the log (if not max time is reached), the
value must have changed at least as much as the configured Exception
Deviation value. For example if the old value = 67, exception deviation =
5, and the exception deviation type = Absolute value, the next value added
to the log must be greater or equal to 72 or less or equal to 62.
Percent of span:
For a new point to be added to the log (if not max time is reached), the
value must have changed at least x% of the configured min and max range.
x is the configured Exception Deviation value, and the min and max
ranges are taken from the Presentation tab of the Log Configuration
aspect. For example if the old value = 67, exception deviation value = 5,
min range = -100, max range = 100, and the exception deviation type =
Percent of span, the next value added to the log must be greater or equal to
77 or less or equal to 57.
Percent of value:
For a new point to be added to the log (if not max time is reached), the
value must have changed at least x%, where x is the configured Exception
Deviation value. For example if the old value = 67, exception deviation
value = 5, and the exception deviation type = Percent of value, the next