User Manual
E727T0005, valid for E-727
BRO, 2019-06-28
Physik Instrumente (PI) GmbH & Co. KG, Auf der Roemerstrasse 1, 76228 Karlsruhe, Germany
Page 78 / 240
Phone +49 721 4846-0, Fax +49 721 4846-1019, Email
Figure 23: "Position Distance" Trigger Mode with threshold settings, trigger output only for positive
direction of motion
Filter settings for start threshold range:
If the "Position Distance" trigger mode is selected and the start and stop thresholds are active
(start threshold
≠
stop threshold), a filter can reduce the influence of noise around the start
threshold. In combination with the
Pos. Distance Trig. Single Direction
parameter (ID 0x18000300)
the filter setting can be used to avoid multiple triggers at the same position in cases where the
noise is too high. Filter options:
The
Pos. Distance Trig. Filter Time
parameter (0x18000301) specifies a time filter.
The time filter is used to delay the trigger deactivation when the axis position falls
below the start threshold due to noise (Figure 25). The time value is given in
seconds. Recommended minimum value: period of the noise signal. Default value: 0
(= filter deactivated)
The
Pos. Distance Trig. Filter Level
parameter (ID 0x18000302) specifies a position
level filter. The position level filter is used to delay the trigger deactivation when the
axis position falls below the start threshold due to noise (Figure 26). The filter level
value is given in axis units. Recommended minimum value: amplitude of the noise
signal. Default value: 0 (= filter deactivated)
Note: Although the activation of multiple triggers at the same position can be avoided by the filter
setting, the precision of the position trigger is lost if the trigger step value is not at least 5 times
higher than the peak-to-peak level of the sensor position noise.