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 94 / 240
Phone +49 721 4846-0, Fax +49 721 4846-1019, Email
Using the Analog Output
How to Work with the Analog Output - Overview
With models E-727.xxxA and .xxxAx, one analog output is available on pin 8 of the
Analog I/O
socket (p. 228). This analog output is accessible in the firmware of the E-727 as output signal
channel 4. Note that the analog output shares output signal channel 4 with the Piezo Ch 4 lines on
the socket for piezo stages (p. 225 or p. 226).
Output signal channel 4 can therefore be configured via parameters
Select Output Type
(ID
0x0a000003) and
Select Output Index
(ID 0x0a000004).
Via the value of the
Select Output Type
parameter (ID 0x0A000003), you can select the purpose for
which the analog output is to be used:
1: Output voltage for a piezo actuator in the stage, output as Piezo Ch 4 on the
socket for piezo stages. The internal control voltage for channel 4 is scaled to be in
the range of -30 to 130 V.
2: Position monitor of an axis, output on pin 8 of the
Analog I/O
socket. The value of
the
Select Output Index
parameter (ID 0x0A000004) determines the axis whose
position is to be output. Note that the output has to be scaled, i.e. the axis position
values have to be associated with suitable output levels (= scaled position values). To
do this, set the
Position Report Scaling
parameter, ID 0x07001005, and the
Position
Report Offset
parameter, ID 0x07001006 to suitable values for the appropriate axis.
For an example, see p. 95.
5: Control signal for an external amplifier, output on pin 8 of the
Analog I/O
socket.
The value of the
Select Output Index
parameter (ID 0x0A000004) determines the
output signal channel whose control value is to be output. The internal control
voltage for channel 4 is already scaled to be in the range of -10 to 10 V. For an
example, see p. 96.
Via the value of the
Select Output Index
parameter, you can connect the analog output with the
axis or channel whose signal is to be output:
If
Select Output Type
has the value 1 or 5, the value of
Select Output Index
gives the
identifier of the output signal channel whose control value is to be used.
If
Select
Output Type
has the value 2, the value of
Select Output Index
gives the identifier of
the axis whose position is to be output.
INFORMATION
If the piezo stage(s) delivered with the E-727 do(es) not use the 4
th
amplifier, parameters
Select
Output Type
and
Select Output Index
are preset so that the position of axis 1 is output on pin 8 of
the
Analog I/O
socket.
If a total of four piezo actuators are present in the stage(s), output signal channel 4 is configured
for use as output voltage (
Select Output Type
has value 1,
Select Output Index
has value 4).
Note that PI will supply E-727 and the piezo stage(s) as a system with appropriate settings.
If you are not sure whether your system can be configured for output of position monitor or
control signal, contact our customer service department (p. 234).