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 74 / 240
Phone +49 721 4846-0, Fax +49 721 4846-1019, Email
Figure 19: Position Distance" Trigger Mode, constant trigger pulse length; pulse length and/or step size not
suitable for the axis velocity
Configuration of threshold values
Optionally, start and stop values can be set with CTO (<StartThreshold> and <StopThreshold>) to
enable the trigger output for a limited position range and a certain direction of motion only
(positive or negative). Should the direction of motion be reversed when the axis position is still
between the start and stop values, the trigger output depends on the value of the
Pos. Distance
Trig. Single Direction
parameter (ID 0x18000300). Default: Trigger pulses will continue to be
generated. For further details, see “Filtering for reduction of false triggers”, p. 76.
When <StartThreshold> and <StopThreshold> are set to the same value, they will not be used.
The following parameters must then be set for the digital output line which is to be used for trigger
output (<TrigOutID>):
Axis (<CTOPam> = 2)
TriggerMode (<CTOPam> = 3)
TriggerStep (<CTOPam> = 1)
StartThreshold (<CTOPam> = 8)
StopThreshold (<CTOPam> = 9)
General notation of the CTO command for this option (in fact, the command arguments can be
divided in five "portions", each starting with the <TrigOutID> declaration):
Command
mnemonic
Axis selection
Trigger mode
selection
Step size setting
Start threshold setting
Stop threshold setting
CTO
<TrigOutID> 2 Axis
<TrigOutID> 3 0
<TrigOutID> 1
Stepsize
<TrigOutID> 8
Startpos
.
<TrigOutID> 9
Stoppos
.