Transcript Dr. Gergely Eugen Ioan

E-LABORATORY PRACTICAL TEACHING FOR
APPLIED ENGINEERING SCIENCES
WORKSHOP
University of Oradea, Romania
February 6, 2012
GENERAL PRESENTATION
Project HURO/0901/028
Acronym: EPRAS
Gergely Eugen Ioan, University of Oradea, Romania
The content of this presentation does not necessarily represent the official position of the
European Union.
E-LABORATORY 1
Applications of combinational logic circuits
The e-laboratory uses digital integrated circuits and software to drive the
hardware. There are studied integrated decoders from BCD to decimal and
from BCD to 7 segments. The electronic structure is designed for a
multiplexed display. Binary sequences generated will modify the display
content of the active digit. The displayed decimal numbers are obtained from
decoded binary numbers. Changes are operable through an interactive
screen, assured through a PC, to which is added an input/output digital
module.
Displays can be LCD or LED. Displays with LED’s are monolithic
structure that has LED components with a common terminal (anode or katod).
Hardware and software assembly is completed in an integrated laboratory
application. For experimental work there is a hardware module connected to
computer and a virtual instrument made in LabView let the user make the
online laboratory.
E-LABORATORY 1
Applications of combinational logic circuits
E-LABORATORY 1
Applications of combinational logic circuits
The interactive interface provides control signals to the electronic board
entries. After the software starts, the user can set the DCBA buttons to a
binary value for the electronic board. The “1” symbol is marked with a green
light. There is another module for automatic counting that is very useful to
demonstrate the multiplexed display.
The hardware structure for multiplexed display contains two integrated
circuits for deco-ding: BCD to 7 segments and BCD to decimal. The display
comprises 4 common anode LED digits. Four pnp transistors BC177 will
supply the four LED digits (Figure 1) with electrical com-mands provided in
the bases of transistors by the active outputs of the BCD to decimal decoder.
The BCD to 7 segments decoder is CDB 447. Similar circuits are in series
fabrication of various companies. It could be used SN5447A or SN54LS47,
produced by Texas Instruments. BCD numbers can be introduced by
activating the DCBA buttons through the software interface.
Later the number is sent via the National Instruments interface and via
the data acquisition hardware NI USB-6216 to the circuit board. The display is
monitored through a webcam by users making the laboratory experiment.
E-LABORATORY 2
Applications of stepper motors
A stepper motor is a special category of synchronous machines,
characterized by a construction and a supply system adequate to its discrete
operation "by steps". Machine windings are supplied with current pulses
resulting from the application of "step" voltages or combination of several
"steps".
There are the following „step modes” for a stepper motor: full step, half
step and microstepping. Full step is obtained by supplying all windings in
order, one by one or two by two. In Half step mode there is combined the one
by one with the two by two supplies of windings. Microstepping is based on
the current control in the motor windings, so it divides the number of
positions between the poles.
In order to choose from different stepping modes, the „Select stepping
mode.vi” was developped. The front panel and block diagram for full stepping
are available in Figure 1. A tab control contains on each page one of the
stepping methods. The student will coordinate the theoretical information
about stepping with a N steps table on the corresponding page of the tab
control and when the motor is running, with a similar representation of the
currents wave-forms. The block diagram is the coresponding case for the tab
page selected on the front panel.
E-LABORATORY 3
Applications of ABB robots
For programming the robot, the ABB - PC Interface IRC5 module will be
used. The PC Interface provides the communication interface between the
robot controller and a network connected PC. This allows external clients
to connect to the IRC5 Controller. The PC Interface option is required to use a
custom RAB PC-based application with a robot controller.
The PC Interface offers system parameter update, RAPID programming
and recording of the robot log file. With the PC Interface, RobotStudio Online
can connect to a controller over a LAN. Another facility is offered by Robot
Application Builder (RAB) which allows system integrators and end users to
program their own operator interfaces for the IRC5 robot controller.
The robot control application is a RAPID language program running in the
robot controller. This program executes a loop in which it waits for
coordinates input and when these coordinates are received the movement is
executed.
E-LABORATORY 3
Applications of ABB robots
In order to accomplish the e-laboratory, the students have to complete
several steps. Firstly, the students has to study the RAPID language
instructions and functions. After this, they have to select one of the trajectory
types or propose a new trajectory task, to develop the pro-gram and to
transmit the file by internet. The operator performs the safety checks , loads
the program into the IRC5 controller and starts the program execution. Then,
the students follow the program execution through a video camera.
Thank you for your attention!