DATA
ACQUISITION AND REAL TIME DIGITAL CONTROL SOFTWARE
on PC and
Compatibe
PURPOSE
Connecting a
computer to the real process is a key issue for tuning a good controller
:
at the beginning one collects input/output data for system
identification,
at the end, one tests the performances of the designed controller.
WINTRAC is a
real time software for data acquisition and digital control which can
operate on various types of plants (motors, chemical processes, thermal
processes, robots...).
The computer is connected to the plant by means of standards
input/output boards (with A/D and D/A converters).
WINTRAC allows
first to collect input/output data during the normal operation of the
process, without disturbing their operation, by issuing very low
magnitude test signals. These data can then be used for the
identification of a model of the process to be controlled (using, for
example, WinPIM software).
Once the controller has been designed (for example using WinREG
software), WinTRAC allows
to test it on the real plant. The user can define the type of reference
signal to be used and then display in real-time the evolution of the
reference signal, of the plant input and of the measured plant output.
The user may modify the reference in real-time and has the possibility
to compare the results obtained with several controllers. The range of
sampling periods that may be used starts from 2 ms (on a PC 486 at 66
Mhz), and does not have an upper limit.
SOFTWARE DESCRIPTION
After
specification of the sampling period, the software offer the following
options:
* data acquisition of analog signals coming from various transducers (up
to 8 differents signals
depending of the type of I/O boards used), simultaneously with the
eventual exitation of the
actuators, corresponding to a test protocol in order to get relevant I/O
data for plant model
identification.
* control in real-time of the plant, with the following options :
- specification of the coefficients of each element of the closed loops
(which may be read directly from a file containing a controller computed
with WinREG).
- specification of the reference signal profile : steps, square, wave,
triangle, sinusoid or another signal stored in a file.
- specification of the saturations to be imposed to the control signal.
- specification of the initial steady state and the way to reach it.
- observation of the evolution in real-time of the various signals :
reference,control signal, plant output.
* When a control experiment is completed, a graphical analysis of data
is possible (zoom, moving line, superposition of curves ...).
* WinTRAC allows to do data acquisition during operation of the
controller, in order to perform identification in closed loop.
- WinTRAC is a part of WinPIM+TR, software package including :
- WinPIM (identification of parametric models)
- WinREG (digital controllers design and analysis)
DISTRIBUTION
KIT
Floppy disk
containing software (executable and help files)
User's Manual (tutorial, reference guide, example)
MINIMAL
CONFIGURATION
PC and compatibles
memory : 1 Mo mini, 2 Mo recommended
1 disk drive 3?1/2
1 hard disk
Windows 3.1 or higher
EGA/VGA graphic screen
printer (option)
mathematical coprocessor (option)
I/O cards :
RTI 815 or RTI 205 Analog Devices
DT 2811 Data Translation
PCL 812 or PCL 812 PG Advantech
Lab PC or Lab PC+ National Instrument
DAC 6214 Amira
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