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E-LABORATORY PRACTICAL TEACHING FOR APPLIED ENGINEERING SCIENCES W O R K S H O P

E-LABORATORY PRACTICAL TEACHING FOR APPLIED ENGINEERING SCIENCES W O R K S H O P University of Oradea, Romania February 6, 2012 G E N E R A L P R E S E N T A T I O N Project HURO/0901/028 Acronym: EPRAS Gergely Eugen Ioan, University of Oradea, Romania

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E-LABORATORY PRACTICAL TEACHING FOR APPLIED ENGINEERING SCIENCES W O R K S H O P

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  1. E-LABORATORY PRACTICAL TEACHING FOR APPLIED ENGINEERING SCIENCES W O R K S H O P University of Oradea, Romania February 6, 2012 G E N E R A L P R E S E N T A T I O N 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.

  2. 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.

  3. E-LABORATORY 1 Applications of combinational logic circuits

  4. 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.

  5. 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.

  6. 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.

  7. 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.

  8. Thank you for your attention!

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