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Labview2_Computer Applications in Control_ACRRL
- 1. ACRRL Applied Control & Robotics Research Laboratory of Shiraz University Computer Applications in Control Lecture 2
- 2. ACRRL Applied Control & Robotics Research Laboratory of Shiraz University Department of Power and Control Engineering, Shiraz University, Fars, Iran. Instructor: Dr. Asemani TA: Mohammad Sabouri
- 3. LabVIEW Interface 02 Block Diagram Data travels on wires from controls through functions to indicators Blocks execute by Dataflow 01 Front Panel User Interface (UI) Controls = Inputs Indicators = Outputs Each Virtual Instrument (VI) has 2 Windows.
- 4. Front Panel Disable the Use localized decimal point option. Disabling makes LabVIEW use point as the decimal separator. (If, in stead, this option is enabled, Lab VIEW uses the decimal separator as defined in the settings of the Windows operating system.)
- 11. Block Diagram • Enable Show subVI names when dropped. This causes names of subVIs to b e shown in a label on top of the subVI icon (block). A subVI is a LabVIEW sub program which can be used as a function in the parent program to perform a specific task. • Disable the Enable auto wiring option. This prevents LabVIEW from automatic ally connecting adjacent blocks. Although it seems useful to have auto wiring enables, it is my experience that the auto wiring is a little annoying since it ten ds to draw wires between blocks when you do not want any wire. • Disable Place front panel elements as icons. This causes LabVIEW to use sm all terminal icons on the block diagram. If you, in stead, activate this option, th e terminal icons are larger, with a mimic of the element as it appears at the fro nt panel. The figure below shows the difference.
- 12. Block Diagram Wire Data Graph Terminal Sub VI While Loop Structure Block Dia gram Tool bar Divide Function Numeric Constant Timing Function Boolean Control Terminal
- 13. Block Diagram Sample1 Front Panel + Block Diagram
- 14. Block Diagram Sample2 Front Panel + Block Diagram
- 15. Block Diagram Sample3 Front Panel
- 16. Front panel Control Palette contains inputs and outputs find: right click front panel
- 17. Block Diagram Functions Palette contains elements for programming Find: right click
- 18. Status Toolbar
- 19. Running the VI • The Run button is used to start the VI. This button becomes white when the VI is not running, and black when it is running. If the VI contains errors, the VI does not start, and the Run button is grey and broken. • The Run Continuously button is used only for testing purposes when you want to run the VI over and over again. It works as when you continuously click the Run button after the VI has stopped. ( Unfortunately many users erroneously clicks the Run Continuously button to run the VI in normal o perations. Actually, you need this button very seldom.) • The Abort button is used to abort the operation of the VI. It is used for abnormal or uncontrolled s top. Typically, the programmer will have put a specific button or switch on the front panel to provid e for a controlled stop. In level_meas.vi there is a red stop button at the bottom of the front panel. • The Pause button is used to pause the VI as it runs. By clicking the Pause button again the VI ru ns again.
- 20. Data Types String: text Pink wires, indicators and controls Integer: no decimal points Blue wires, indicators and controls Double Precision Floating Point: numbers with decimal point Orange wires, indicators and controls Boolean: True or false Green wires, indicators and controls
- 21. Data Types Scalar 1D array 2D array Color Floating-point number orange Integer number blue Boolean green String pink
- 27. Example2: Control Terminals Block Diagram WindowFront Panel Window Indicator Terminals
- 28. Example3: