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 111 / 240
Phone +49 721 4846-0, Fax +49 721 4846-1019, Email
Wave Generator Started by Trigger Input
Using the digital input lines of the E-727, it is possible to apply start/stop signals for the wave
generator output. See the pinout description of the digital I/O socket (p. 227) for the availability of
the lines and "Using Digital Input" (p. 68) for an overview.
INFORMATION
For reliable triggering, the pulse width of the input signal has to be at least 2 x the servo update
time of the E-727. The servo update time is given in seconds by parameter 0x0E000200.
An example for how to start / stop the wave generator by external trigger signals:
Command String to Send Action Performed
WAV 2 X SIN_P 2000 20 10
2000 0 1000
Define a sine waveform for Wave Table 2, the segment length and
hence the number of points in the wave table is 2000
WSL 1 2
Connect Wave Generator 1 (Axis 1) to Wave Table 2
WGO 1 2
Start output of Wave Generator 1 triggered by external signal. To
provide the external signal, the digital input lines IN1 or IN2 can be
used.
If IN1 is used: The wave generator output starts with the first rising
edge which is detected on this input line.
If IN2 is used: The generator output starts with the first rising edge
which is detected on this input line, and it will be stopped when a
falling edge is detected on this line. With the next rising edge, the
generator output will continue at the waveform point where it was
stopped. Starting and stopping the wave generator this way can be
repeated indefinitely.
If output cycle limitations were made with WGC: with each
generator restart the counting of the output cycles continues, and
the generator will be stopped when the given number of cycles are
completed, irrespective of any further trigger pulses.
It is possible to mix the usage of both digital input lines.
WGO 1 0
Stop output of Wave Generator 1 (any further trigger pulses will be
ignored). You can also use #24 or STP.
INFORMATION
When the wave generator is to be started by an external trigger signal (WGO bit 1 is set), the
value of the
Wave Multi Start By Trigger
parameter (ID 0x13000202) determines if the trigger is
enabled for only one generator start or for multiple starts:
0 = Trigger is enabled for only one generator start. Trigger becomes disabled after the generator
has been started. To enable the trigger again, WGO must be sent again with start mode bit 1 set.
Default setting.
1 = As long as WGO bit 1 is set, the trigger stays enabled for an unlimited number of generator
starts. To disable the trigger, the wave generator output must be stopped with WGO, STP or #24.