LabView. Some pictures and slides from LabVIEW Introduction Course. 10 października 2014 Wojciech Kucewicz 1

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1 LabView Some pictures and slides from LabVIEW Introduction Course 10 października 2014 Wojciech Kucewicz 1

2 Pakiet graficznego programowania przyrządów techniczno-programowych Pakiet LabVIEW Johnson Gary W. -LabVIEW Graphical Programming : Practical Applications in Instrumentation and Control (1995) Wells Lisa K. -LabVIEW for Everyone: Graphic Programming Made Even Easier LabView for Windows -Tutorial 10 października 2014 Wojciech Kucewicz 2

3 /*Program do znajdowania maksymalnego elementu macierzy*/ Programowanie graficzne #include<math.h> main() { double num[10],max; int; for (i=0; i<10; i==){ num[i]=(double rand(10)/pow(2.0,15.0); printf( %f/n,num[i]); } max=num[0] for (i=0; i<10; i==){ if (num[i]>max)max=num[i]; } printf( nmax:%f/n,max); } Program w ANSI C Program w LabView wyszukujący wartość maksymalną i minimalną 10 października 2014 Wojciech Kucewicz 3

4 /*Program do znajdowania maksymalnego elementu macierzy*/ Programowanie graficzne #include<math.h> main() { double num[10],max; int; for (i=0; i<10; i==){ num[i]=(double rand(10)/pow(2.0,15.0); printf( %f/n,num[i]); } max=num[0] for (i=0; i<10; i==){ if (num[i]>max)max=num[i]; } printf( nmax:%f/n,max); } Program w ANSI C Program w LabView wyszukujący wartość maksymalną i minimalną 10 października 2014 Wojciech Kucewicz 4

5 Programowanie graficzne Program w LabView wyszukujący wartość maksymalną i minimalną oraz indeksyy tych wartości w matrycy 10 października 2014 Wojciech Kucewicz 5

6 Charakterystyka programu: Służy do kontroli akwizycji danych i urządzeń w zautomatyzowanych systemach kontrolno-pomiarowych. Jest to język programowania graficznego do tworzenia programu w postaci diagramu blokowego Może być stosowany na różnych platformach systemowych (Windows, Macintosh, UNIX) Zawiera biblioteki dla akwizycji danych, sterowania urządzeń przez złącze szeregowe i GPIB, analizy danych, prezentacji danych i gromadzenia danych Pozwala na łatwą kontrolę tworzonego programu (set breakpoint, animation, single step) Programy nazywane są Virtual Instruments (VIs) ponieważ obrazują wygląd rzeczywistych urządzeń Jest programowaniem modulowym 10 października 2014 Wojciech Kucewicz 6

7 LabVIEW Awards Readers of Electronic Design name invention of LabVIEW as one of the Top 50 Milestones for the Electronics Industry LabVIEW 6.1 receives IAN Automation Excellence Award of 2002 Design News awards LabVIEW 6i Best Computer Productivity Tool of 2000 LabVIEW 6i chosen the Best of the Best in the software category by readers of Evaluation Engineering 10 października 2014 Wojciech Kucewicz 7

8 NI LabVIEW: A History of Innovation 2011 May 2003 January 2002 August 2000 NI developed the LV virtualinstrument concept intuitive front panel user interfaces combined with an innovative block diagram programing methodology March 1998 February 1996 August 1993 September 1992 January 1990 October 1986 April 1983 LabVIEW project begins 10 października 2014 Wojciech Kucewicz 8

9 NI LabVIEW: A History of Innovation 2011 May 2003 January 2002 NI chose Macintosh because that operating system s grphical naure best accommodated the LabView technology August 2000 March 1998 February 1996 August 1993 September 1992 January 1990 October 1986 LabVIEW 1.0 for Macintosh April 1983 LabVIEW project begins 10 października 2014 Wojciech Kucewicz 9

10 NI LabVIEW: A History of Innovation 2011 May 2003 January 2002 LabView2 featured a compiler that made execution speeds of VI comparable with the C programming August 2000 March 1998 February 1996 August 1993 September 1992 January 1990 October 1986 LabVIEW 2.0 for Macintosh LabVIEW 1.0 for Macintosh April 1983 LabVIEW project begins 10 października 2014 Wojciech Kucewicz 10

11 NI LabVIEW: A History of Innovation 2011 May 2003 January 2002 August 2000 March 1998 February 1996 August 1993 LabVIEW 2011 LabVIEW 7 Express VIs, I/O Assistants, FPGA/PDA targets LabVIEW 6.1 Enhanced networking capabilities, analysis LabVIEW 6i Internet-ready measurement intelligence LabVIEW 5.0 ActiveX, Multithreading LabVIEW 4.0 Added professional tools, improved debugging LabVIEW 3.0 Multiplatform version of LabVIEW September 1992 LabVIEW for Windows January 1990 October 1986 LabVIEW 2.0 for Macintosh LabVIEW 1.0 for Macintosh April 1983 LabVIEW project begins 10 października 2014 Wojciech Kucewicz 11

12 Leveraging Commercial Technologies Third-Party Software Wolfram Research Mathematica Microsoft Excel The MathWorks MATLAB and Simulink MathSoft MathCAD Electronic Workbench MultiSim Texas Instruments Code Composer Studio Ansoft RF circuit design software Microsoft Access Microsoft SQL Server Oracle Communication Protocols Ethernet CAN DeviceNet USB IEEE 1394 RS-232 GPIB RS-485 Users have been able to move their programs from one platform to another without loosing any work. 10 października 2014 Wojciech Kucewicz 12

13 LabVIEW Everywhere PC Boards Wireless Networked I/O Handheld Sensor Embedded (FPGA) Workstation PC, Mac, Linux, Sun Industrial Computer (PXI) Tektronix Open Windows Oscilloscopes 10 października 2014 Wojciech Kucewicz 13

14 Acquire, Analyze, and Present Nearly all test, measurement, and control applications can be divided into 3 main components: the ability to acquire, analyze, and present data. LabVIEW is the easiest, most powerful tool for acquiring, analyzing, and presenting real-world data. 10 października 2014 Wojciech Kucewicz 14

15 Acquire with LabVIEW LabVIEW is tightly integrated with all NI hardware, In addition to connecting to thousands of I/O devices from hundreds of different vendors. LabVIEW can acquire data using the following devices and more: GPIB, Serial, Ethernet VXI - VME extensions for Instrumentation Data Acquisition (DAQ) PCI extensions for Instrumentation (PXI) Image Acquisition (IMAQ) Motion Control Real-Time (RT) PXI PLC- Programmable Logic Controller (through OPC Server) PDA - Personal Digital Assistant Modular Instruments 10 października 2014 Wojciech Kucewicz 15

16 Analyze with LabVIEW Powerful measurement analysis is built in to the LabVIEW development environment. LabVIEW includes the following tools to help you analyze your data: More than 400 measurement analysis functions for Differential Equations, Optimization, Curve Fitting, Calculus, Linear Algebra, Statistics, etc. 12 new Express VIs specifically designed for measurement analysis, including filtering and spectral analysis Signal Processing VIs for Filtering, Windowing, Transforms, Peak Detection, Harmonic Analysis, Spectrum Analysis, etc. 10 października 2014 Wojciech Kucewicz 16

17 Present with LabVIEW Presentation with LabVIEW can be done on your PC or over a network, or you can take advantage of additional applications such as DIAdem. LabVIEW includes the following tools to help you present your data: On your machine Graphs, Charts, Tables, Gauges, Meters, Tanks, 3D Controls, Picture Control, 3D Graphs (Windows Only), Report Generation (Windows Only) Over the Internet Web Publishing Tools, Datasocket (Windows Only), TCP/IP, VI Server, Remote Panels, Enterprise Connectivity Toolset SQL Tools (Databases), Internet Tools (FTP, Telnet, HTML) 10 października 2014 Wojciech Kucewicz 17

18 LabVIEW start up menu bar with standard items set of buttons for creating and opening VIs help 10 października 2014 Wojciech Kucewicz 18

19 LabVIEW start up Front Panel Interaktywny interfejs użytkownika obrazujący funkcjonowanie urządzenie pomiarowe Zawiera regulatory (control) (symulujące elementy wejściowe urządzenia i dostarczające informacji do diagramu blokowego) i wskaźniki (indicator) (symulujące elementy wyjściowe urządzenia, które prezentują zebrane lub wygenerowane przez diagram Block Diagram blokowy dane) Okno programowania graficznego, jest kodem źródłowym dla panelu frontowego. Programowanie polega na łączeniu obiektów wysyłających lub odbierających dane z elementami realizującymi zadane funkcje lub struktury (nodes). Utworzone w panelu frontowym regulatory i wskaźniki są automatycznie generowane w diagramie blokowym w postaci końcówek (terminals) 10 października 2014 Wojciech Kucewicz 19

20 LabVIEW start up 10 października 2014 Wojciech Kucewicz 20

21 LabVIEW start up 10 października 2014 Wojciech Kucewicz 21

22 LabVIEW start up 10 października 2014 Wojciech Kucewicz 22

23 LabVIEW Menu basic file operations appearance of the current windows and palettes search for and modify LabVIEW files control the operation of your VIs configuring LabVIEW 10 października 2014 Wojciech Kucewicz 23

24 Block DiagramMenu Warning indicator Enter button Execution Highlighting button Step Into button Step Over button Step Out button Broken Run button 10 października 2014 Wojciech Kucewicz 24

25 VI Front Panel Front Panel Toolbar Icon Boolean Control Graph Legend Waveform Graph Plot Legend Scale Legend 10 października 2014 Wojciech Kucewicz 26

26 Block Diagram Toolbar VI Block Diagram Divide Function SubVI Graph Terminal Wire Data While Loop Structure Numeric Constant Timing Function Boolean Control Terminal 10 października 2014 Wojciech Kucewicz 27

27 Tools Palette Floating Palette available on the front panel and the block diagram Used to operate and modify front panel and block diagram objects. A tool is a special operating mode of the mouse cursor Use the tools to operate and modify front panel and block diagram objects To show the tools palette, select Window»Show Tools Palette 10 października 2014 Wojciech Kucewicz 28

28 Tools Palette Automatic Selection Tool Operating Tool Positioning/Resizing Tool Labeling Tool Wiring Tool Shortcut Menu Tool Scrolling Tool Breakpoint Tool Probe Tool Color Copy Tool Coloring Tool 10 października 2014 Wojciech Kucewicz 29

29 Tools Pallete Operating changes the value of a control or selects the text within a control. Positioning positions, resizes, and selects objects. Labeling edits text and creates free labels. Wiring wires objects together on the block diagram. Object Shortcut Menu opens the shortcut menu of an object. Scroll scrolls the window without using the scroll bars. Breakpoint sets breakpoints on VIs, functions, nodes, and wires to pause execution at that location. Probe creates probes on wires. Use the Probe tool to check intermediate values in a VI that produces questionable or unexpected results. Color Copy copies colors for pasting with the Color tool. Color sets the foreground and background colors. 10 października 2014 Wojciech Kucewicz 30

30 Controls Palette Controls Palette Contains the most commonly used controls All Controls Palette Shows all controls 10 października 2014 Wojciech Kucewicz 31

31 Controls Palette You build a front panel by placing controls and indicators from the Controls palette. Each palette icon represents a subpalette, which contains controls you place on the front panel. A control is a front panel object that the user manipulates to interact with the VI. Simple examples of controls are buttons, slides, dials, and text boxes. An indicator is a front panel object that displays data to the user. Examples of indicators are graphs, thermometers, and gauges. When you place a control or indicator on the front panel, a corresponding terminal is placed on the block diagram. 10 października 2014 Wojciech Kucewicz 32

32 Palette 10 października 2014 Wojciech Kucewicz 33

33 Palette 10 października 2014 Wojciech Kucewicz 34

34 Functions Palette Functions Palette Contains the Express VIs (interactive VIs with configurable dialog page) and the most commonly used functions All Functions Palette Shows all functions 10 października 2014 Wojciech Kucewicz 35

35 Palette You build the block diagram using the terminals from the front panel controls and indicators and the VIs, functions, and structures from the Functions palette. Each palette icon represents a subpalette, which contains VIs and functions you place on the block diagram. The structures, functions, and VIs -collectively known as nodes -on the Functions palette provide the functionality of your VI. As you add nodes to the block diagram, you wire them to each other and to the terminals from the front panel objects using the Wiring tool, found on the Tools palette. A complete block diagram appears similar to a flowchart. 10 października 2014 Wojciech Kucewicz 36

36 Palettes 10 października 2014 Wojciech Kucewicz 37

37 Palettes 10 października 2014 Wojciech Kucewicz 38

38 Palettes 10 października 2014 Wojciech Kucewicz 39

39 Palettes 10 października 2014 Wojciech Kucewicz 40

40 Palettes Press the search button to perform text searches of the palettes Click and drag an item from the search window to the block diagram or double-click an item to open the owning palette 10 października 2014 Wojciech Kucewicz 41

41 Front Panel Build the front panel with controls (inputs) and indicators (outputs) Owned Labels Numeric Indicator Boolean Control Boolean Indicator Increment Buttons Numeric Control 10 października 2014 Wojciech Kucewicz 42

42 Panel frontowy (Front Panel) Panel frontowy zawiera dwa rodzaje elementów: regulatory i wskaźniki są to interaktywne końcówki wejściowe i wyjściowe wskaźnik regulator 10 października 2014 Wojciech Kucewicz 43

43 Front Panel Creating Objects Block Diagram końcówka 10 października 2014 Wojciech Kucewicz 44

44 Panel programowy (Block Diagram) Panel programowy zawiera trzy rodzaje elementów: końcówki (terminals), węzły (nodes) i ścieżki (wires) Końcówki są to porty przez które dane wymieniane są z panelem frontowym oraz między węzłami Węzły są to elementy wykonawcze programu. Ścieżki tworzą połączenia między elementami końcówka regulator końcówka wskaźnik węzeł ścieżka 10 października 2014 Wojciech Kucewicz 45

45 Express VIs, VIs and Functions 1. Express VIs: interactive VIs with configurable dialog page 2. Standard VIs: modularized VIs customized by wiring 3. Functions: fundamental operating elements of LabVIEW; no front panel or block diagram 10 października 2014 Wojciech Kucewicz 46

46 Block Diagram Nodes Icon Expandable Node Expanded Node Function Generator VI Same VI, viewed three different ways Yellow field designates a standard VI Blue field designates an Express VI 10 października 2014 Wojciech Kucewicz 47

47 Block Diagram Terminals Terminals are entry and exit ports that exchange information between the panel and diagram Terminals are analogous to parameters and constants in text-based programming languages Right-click and toggle View As Icon to change the icon view 10 października 2014 Wojciech Kucewicz 48

48 Wiring the Block Diagram Scalar 1D Array 2D Array Numeric Boolean String Dynamic 10 października 2014 Wojciech Kucewicz 49

49 Wiring Techniques Automatic Wiring Use Context Help Window when wiring Right-click wire and select Clean Up Wire Tip Strips Automatic wire routing Right-click terminals and select Visible Items»Terminals Hot Spot View the terminal connections to a function 10 października 2014 Wojciech Kucewicz 50

50 Context Help 1. To display the Context Help window, select Help»Show Context Help, press the <Ctrl-H> keys, or press the Show Context Help Window button in the toolbar 2. Move cursor over object to display help 3. Connections: Required bold Recommended normal Optional - dimmed Simple/Detailed Context Help Lock Help More Help 10 października 2014 Wojciech Kucewicz 51

51 Help Options Context Help Online help Lock help Simple/Complex Diagram help Ctrl + H Online reference All menus online Pop up on functions in diagram to access online info directly 10 października 2014 Wojciech Kucewicz 52

52 To find an example, select Help»Find Examples Web-integrated Search by keyword, example type, hardware type, etc. NI Example Finder 53

53 Finding Errors Execution Highlighting Debugging Techniques Click on broken Run button Window showing error appears Click on Execution Highlighting button; data flow is animated using bubbles. Values are displayed on wires. Probe Right-click on wire to display probe and it shows data as it flows through wire segment You can also select Probe tool from Tools palette and click on wire 10 października 2014 Wojciech Kucewicz 54

54 Debugging Techniques Probe Right-click on wire and select probe and it shows data as it flows through the wire segment Breakpoints Right-click on wire and select Set Breakpoint; pause execution at the breakpoint. Conditional Probe Combination of a breakpoint and a probe. Right-click on wire and select custom probe. 56

55 Debugging Techniques As with any programming environment some form of debugging is vital. Note the light bulb icon within the Diagram window. Off On 10 października 2014 Wojciech Kucewicz 57

56 Debugging Techniques Click on the light bulb icon and it will illuminate Run the Vi. It will run slowly showing the values as they pass along the connecting wires. 10 października 2014 Wojciech Kucewicz 58

57 LabView Debugging The three buttons to the right of the light bulb allow the Vi to be single stepped. First Button single step including entering SubVIs where possible. Second Button the same but over SubVI. Third Button end the single stepping and allow the VI to continue. The roll over help indicates the each button s function dynamically. 10 października 2014 Wojciech Kucewicz 60

58 Summary Virtual instruments (VIs) have three main parts the front panel, the block diagram, and the icon and connector pane The front panel is the user interface of a LabVIEW program and the block diagram is the executable code The block diagram contains the graphical source code composed of nodes, terminals, and wires Use Express VIs, standard VIs and functions on the block diagram to create your measurement code. For the most common requirements, use Express VIs with interactive configuration dialogs to define your application. Floating Palettes: Tools Palette, Controls Palette (only when Front Panel Window is active), and Functions Palette (only when Block Diagram Window is active) There are help utilities including the Context Help Window and LabVIEW Help 10 października 2014 Wojciech Kucewicz 61

59 Summary Place controls (inputs) and indicators (outputs) in the front panel window Use the Operating tool to manipulate panel objects. Use the Positioning tool to select, move, and resize panel objects. Use the Wiring tool to connect diagram objects Control terminals have thicker borders than indicator terminals All front panel objects have property pages and shortcut menus Wiring is the mechanism to control dataflow and produce LabVIEW programs Broken Run arrow means a nonexecutable VI Various debugging tools and options available such as setting probes and breakpoints, execution highlighting, and single stepping 10 października 2014 Wojciech Kucewicz 62

60 Common keyboard shortcuts Access Tools Palette with <shift>-right-click Increment/Decrement faster using <shift> key Tools»Options selection set preferences in LabVIEW VI Properties (File menu) Useful shortcuts Windows Sun Linux MacOS <Ctrl-R> < -R> <M-R> <z-r> Run a VI <Ctrl-F> < -F> <M-F> <z-f> Find object <Ctrl-H> < -H> <M-H> <z-h> Activate Context Help window <Ctrl-B> < -B> <M-B> <z-b> Remove all broken wires <Ctrl-W> < -W> <M-W> <z-w> Close the active window <Ctrl-E> < -E> <M-E> <z-e> Toggle btwn Diagram/Panel Window 10 października 2014 Wojciech Kucewicz 63

61 SubVI 10 października 2014 Wojciech Kucewicz 64

62 SubVIs A SubVI is a VI that can be used within another VI Similar to a subroutine Advantages Modular Easier to debug Don t have to recreate code Require less memory 10 października 2014 Wojciech Kucewicz 65

63 Icon and Connector Icon Terminals Connector 1. An icon represents a VI in other block diagrams 2. A connector shows available terminals for data transfer 10 października 2014 Wojciech Kucewicz 66

64 SubVIs Sub VIs SubVI extended form SubVI icon 10 października 2014 Wojciech Kucewicz 67

65 Steps to Create a SubVI 1. Create the Icon 2. Create the Connector 3. Assign Terminals 4. Save the VI 5. Insert the VI into a Top Level VI 10 października 2014 Wojciech Kucewicz 68

66 Create the Connector Right click on the icon pane (front panel only) 10 października 2014 Wojciech Kucewicz 69

67 Tworzenie podprogramu SubVI 1) Design the VI icon 2) Define patern of terminals 10 października 2014 Wojciech Kucewicz 70

68 Assign Terminals 3) Assign terminals to proper indicators or controls 10 października 2014 Wojciech Kucewicz 71

69 Assign Terminals Terminal colors match the data types to which they are connected Click the terminal to see its associated front panel object 10 października 2014 Wojciech Kucewicz 72

70 Save The VI 1. Choose an Easy to Remember Location 2.Organize by Functionality Save Similar VIs into one directory (e.g. Math Utilities) 3.Organize by Application Save all VIs Used for a Specific Application into one directory or library file (e.g. Lab 1 Frequency Response) Library Files (.llbs) combine many VI s into a single file, ideal for transferring entire applications across computers 10 października 2014 Wojciech Kucewicz 73

71 Create SubVI - Option 2 1. Enclose area to be converted into a subvi 2. Select Create SubVI from the Edit Menu Edit/Create SubVI 10 października 2014 Wojciech Kucewicz 74

72 Classifying Terminals Classify inputs and outputs: Required Error if no connection Recommended Warning if no connection Optional No effect if no connection 10 października 2014 Wojciech Kucewicz 75

73 Using a VI as a SubVI All Functions» Select a VI Drag icon onto target diagram 10 października 2014 Wojciech Kucewicz 76

74 SubVI VIs can be used as subvis after you make the icon and connector Icon created using Icon Editor Connector defined by choosing number of terminals Load subvis using the Select a VI option in the All Functions palette or dragging the icon onto a new diagram Online help for subvis using the Show Context Help option Descriptions document functionality Use Create SubVI feature to easily modularize the block diagram 10 października 2014 Wojciech Kucewicz 77

75 C to F subvi Let define VI that covert Celsius to Farenheit degrees and make the subvi 10 października 2014 Wojciech Kucewicz 78

76 Select function Functions paletts/ comparison block 10 października 2014 Wojciech Kucewicz 79

77 Select function Data stream T Boolean Control Data stream F? T F Data stream output 10 października 2014 Wojciech Kucewicz 80

78 Select function Data Stream In True? T F Data Stream Out 10 października 2014 Wojciech Kucewicz 81

79 Select function False Data Stream In? T F Data Stream Out 10 października 2014 Wojciech Kucewicz 82

80 Temperature Front Panel Design VI with the switch between Celsius and Fahrenheit degrees 10 października 2014 Wojciech Kucewicz 83

81 Węzły specjalne (Structure) 10 października 2014 Wojciech Kucewicz 84

82 While Loop 10 października 2014 Wojciech Kucewicz 85

83 While Loops Repeat (code); Until Condition met; End; While Loop Flow Chart Pseudo Code 10 października 2014 Wojciech Kucewicz 86

84 While Loop 2. Enclose code to be repeated 3. Drop or drag additional nodes and then wire 1. Select While Loop 2. Create loop 3. Design program within the loop 10 października 2014 Wojciech Kucewicz 87

85 Select the Loop Condition Executes its subdiagram until a Boolean value you wire to the conditional terminal is FALSE. Click the Conditional Terminal with the Operating tool to define when the loop stops Default: Stop if True Iteration Terminal Conditional Terminal 10 października 2014 Wojciech Kucewicz 88

86 Accessing Previous Loop Data Shift Register As an option, you can add shift registers so you can pass information from one iteration to the next by popping up on the edge of the structure. Available at left or right border of loop structures Right-click the border and select Add Shift Register Right terminal stores data on completion of iteration Left terminal provides stored data at beginning of next iteration Initial Value Value 1 Value 2 Value 3 Before Loop Begins First Iteration Second Iteration Last Iteration 10 października 2014 Wojciech Kucewicz 89

87 Structure Tunnels 1. Tunnels feed data into and out of structures. 2. The tunnel is a block that appears on the border; the color of the block is related to the data type wired to the tunnel. 3. When a tunnel passes data into a loop, the loop executes only after data arrive at the tunnel. 4. Data pass out of a loop after the loop terminates. 10 października 2014 Wojciech Kucewicz 91

88 While Loop Example Measurement of the temperature continuously SubVI (C to F) Stop measurment Sensor Delay of 250ms for each loop Counting of the measurment number 10 października 2014 Wojciech Kucewicz 92

89 While Loop Example Measurement of the temperature continuously and display average value Average calculated from last 3 values Use of the shift register Display 2 values on one display 10 października 2014 Wojciech Kucewicz 93

90 While Loop Example Measurement of the temperature continuously and display average value 10 października 2014 Wojciech Kucewicz 94

91 For Loop 10 października 2014 Wojciech Kucewicz 95

92 For Loops N=100; i=0; Until i=n: Repeat (code; i=i+1); End; For Loop Flow Chart Pseudo Code 10 października 2014 Wojciech Kucewicz 96

93 For Loop Executes its subdiagram n times, where n equals the value contained in the count terminal. As an option, you can add shift registers so that you can pass information from one iteration to the next by popping up on the edge of the structure. Number of iterations Current iteration Shift register 10 października 2014 Wojciech Kucewicz 97

94 For Loops In Structures subpalette of Functions palette Enclose code to be repeated and/or resize and add nodes inside boundary Executes diagram inside of loop a predetermined number of times Count terminal (Numerical input) Wait Until Next ms Multiple function 10 października 2014 Wojciech Kucewicz 98

95 Wait functions Wait Until Next ms Multiple Pre-loop code Loop code Functions»Time & Dialog palette 10 października 2014 Wojciech Kucewicz 99

96 Wait functions Wait (ms) Pre-loop code Loop code Functions»Time & Dialog palette Time Delay Functions»Time & Dialog palette 10 października 2014 Wojciech Kucewicz 100

97 For Loop Example Temperature vs. Time. Read 100 times data and display temperature vs. Time graph Temperature vs. Time Graph Measurements 10 października 2014 Wojciech Kucewicz 101

98 For Loop Example Temperature vs. Time. Calculate Max, Min, Mean, Polynimial Fit. Write to Excel File. Max Min Mean Display Data and Fit Fit algorithm Wirte to File 10 października 2014 Wojciech Kucewicz 102

99 For Loop Example Temperature vs. Time. Calculate Max, Min, Mean, Polynomial Fit. Write to Excel File. 10 października 2014 Wojciech Kucewicz 103

100 Case Structure 10 października 2014 Wojciech Kucewicz 104

101 Simple Decision: Select Function If Temp Scale is TRUE, pass top input; if temp scale is FALSE, pass bottom input. If the decision to be made is more complex than a Select function can execute, a Case Structure may be what is required. 105

102 Case Structure Has one or more subdiagrams, or cases, exactly one of which executes when the structure executes. Whether it executes depends on the value of the Boolean, string, or numeric scalar you wire to the external side of the terminal or selector. 10 października 2014 Wojciech Kucewicz 106

103 Case Structures Boolean Case Structure Example: If Temp Scale is TRUE, execute True case; if temp scale is FALSE, execute False case. 107

104 Case Structures In the Structures subpalette of Functions palette Enclose nodes or drag them inside the structure Stacked like a deck of cards, only one case visible at a time 108

105 String, Enum, and Error Cases String Case Enum Case Error Case 109

106 Boolean and Numeric Cases Wire all possible outputs of the case structure 110

107 Case Structure Example Execution depends on the value of the Boolean, string, or numeric scalar wired to the external side of the selector. 10 października 2014 Wojciech Kucewicz 111

108 Indicate when temperature is over limit Case Structure Example 10 października 2014 Wojciech Kucewicz 112

109 Indicates when temperature is over limit Case Structure Example Case True Case False 10 października 2014 Wojciech Kucewicz 113

110 Summary The Select function is used to choose between two inputs dependant on a boolean input. A Case structure has two or more cases. Only one case is visible at a time, and the structure executes only one case at a time. If the case selector terminal is Boolean, the structure has a TRUE case and a FALSE case. If the selector terminal is an integer, string, or enumerated type value, the structure can have up to cases. Inputs are available to all cases, but cases do not need to use each input. If at least one output tunnel is not defined, all output tunnels on the structure appear as white squares. 114

111 Sequence Structure 10 października 2014 Wojciech Kucewicz 115

112 Sequence Structure Consists of one or more subdiagrams, or frames, that execute sequentially. As an option, you can add sequence locals that allow you to pass information from one frame to subsequent frames by popping up on the edge of the structure. 10 października 2014 Wojciech Kucewicz 116

113 Sequence Structure 1. Define sampling rate and X scale multiplier. Clear the display at start. Write time of the start. 10 października 2014 Wojciech Kucewicz 117

114 Sequence Structure 2. Define number of measurements. Acquire data. 10 października 2014 Wojciech Kucewicz 118

115 Sequence Structure 3. Write the end time 10 października 2014 Wojciech Kucewicz 119

116 Sequence Structure 10 października 2014 Wojciech Kucewicz 120

117 Feedback Node 10 października 2014 Wojciech Kucewicz 121

118 Feedback In For Loops and While Loops, transfers values from one loop iteration to the next. You can place a Feedback Node only in a For Loop or While Loop. You can replace the Feedback Node with a shift register or replace shift registers with a Feedback Node. 10 października 2014 Wojciech Kucewicz 122

119 Feedback Output = 5 Output = 5 Run Once VI stops execution Run Again Output = 5 Output = 5 10 października 2014 Wojciech Kucewicz 123

120 Feedback Output = 4 Output = 8 Run Once VI stops execution Run Again Output = 4 Output = 8 10 października 2014 Wojciech Kucewicz 124

121 Feedback Read temperature. Calculate online: Mean, maximum, minimum and polynomial fit. When STOP wite data to the excel file. Initializer terminal Feedback node Build array 10 października 2014 Wojciech Kucewicz 125

122 Feedback 10 października 2014 Wojciech Kucewicz 126

123 Formula Node 10 października 2014 Wojciech Kucewicz 127

124 Formula Node The Formula Node is a resizable box similar to the four structures (Sequence Structure, Case Structure, For Loop, and While Loop). Instead of containing a subdiagram, however, the Formula Node contains one or more formula statements delimited by a semicolon, as in the following example. Formula statements use a syntax similar to most text-based programming languages for arithmetic expressions. You can add comments by enclosing them inside a slash-asterisk pair (/*comment*/). 10 października 2014 Wojciech Kucewicz 128

125 Formula Node In the Structures subpalette Implement complicated equations Variables created at border Variable names are case sensitive Each statement must terminate with a semicolon (;) Context Help Window shows available functions Note semicolon 129

126 Decision Making with Formula Nodes Two different ways of using an if-then statement in a Formula Node Both structures produce the same result 130

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