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 75 / 240
Phone +49 721 4846-0, Fax +49 721 4846-1019, Email
Instead of using the CTO command, you can also set the values of the corresponding parameters
with SPA or SEP, see “Configuring Trigger Output” (p. 69) for a parameter list.
INFORMATION
For reliable activation of the trigger output, the axis has to move through the “Trigger ready, not
active” position range, or the motion has to start in this range (see Figure 20 and Figure 21).
For reliable deactivation of the trigger output, the axis has to move through the “Trigger stopped”
position range, or the motion has to end in this range (see Figure 20 and Figure 21). Of course, the
trigger output is also deactivated when the axis leaves the trigger range via the StartThreshold.
The distance between the start position of the axis and the StartThreshold setting has to be at least
3 times larger than the noise of the axis position (peak-to-peak value), as well as the distance
between the end position of the axis and the StopThreshold setting. In addition, the distance
between the start position of the axis and the StartThreshold has to be at least TriggerStep/4.
See the examples 2 and 3 below for details.
Example 2: A pulse on the digital output line 1 is to be generated whenever axis 1 of the stage has
covered a distance of 0.1 µm, as long as axis 1 moves in positive direction in the range of 0.2 µm to
0.55 µm (start threshold < stop threshold). For reliable activation and deactivation of the trigger
output, the axis motion should start at 0.15 µm and end at 0.6 µm. Send:
CTO 1 2 1 1 3 0 1 1 0.1 1 8 0.2 1 9 0.55
Figure 20: "Position Distance" Trigger Mode with threshold settings for positive direction of motion;
variable pulse length (Pos. Distance Trig. High Time Definition parameter has the value 0)