Virtual Instrumentation Using Labview Views. Snapshot About the book Sample book. This book provides a practical and accessible understanding of the fundamental principles of virtual instrumentation.
Key Features : Builds the concept of virtual instrumentation by using clear-cut programming elements. Includes a summary that outlines important learning points and skills taught in the chapter.
Download Sample PDF. Ebook Days. The primary benefits of apply data acquisition technology to configure virtual instrumentation include costs, size, and flexibility and ease of programming.
Traditional instruments and software-based virtual instruments largely share the same architectural components, but radically different philosophies as shown in Figure 1. They also require a lot of power, and often have excessive amounts of features that are rarely, if ever used. Most conventional instruments do not have any computational power as compared to a virtual instrument. Virtual instruments are compatible with traditional instruments almost without exception.
Virtual instrumentation software typically provides libraries for interfacing with common ordinary instrument buses such as GPIB, serial or Ethernet. Except for the specialized components and circuitry found in traditional instruments, the general architecture of stand-alone instruments is very similar to that of a PC-based virtual instrument.
Both require one or more microprocessors, communication ports for example, serial and GPIB , and display capabilities, as well as data acquisition modules. What makes one different from the other is their flexibility and the fact that we can modify and adapt the instrument to our particular needs. A traditional instrument might contain an integrated circuit to perform a particular set of data processing functions; in a virtual instrument, these functions would be performed by software running on the PC processor.
We can extend the set of functions easily, limited only by the power of the software used. By employing virtual instrumentation solutions, we can lower capital costs, system development costs, and system maintenance costs, while improving time to market and the quality of our own products.
There is a wide variety of hardware devices available which we can either plug into the computer or access through a network. These devices offer a wide range of data acquisition capabilities at a significantly lower cost than that of dedicated devices. As integrated circuit technology advances, and off-the-shelf components become cheaper and more powerful, so do the boards that use them.
With these advances in technology, comes an increase in data acquisition rates, measurement accuracy, precision and better signal isolation. Depending on the particular application, the hardware we choose might include analog input or output, digital input or output, counters, timers, filters, simultaneous sampling, and waveform generation capabilities.
Keys to its success include rapid PC advancement; explosive low-cost, high-performance data converter semiconductor development; and system design software emergence. These factors make virtual instrumentation systems accessible to a very broad base of users.
These rapid advancements combined with the general trend that technical and computer literacy starts early in school, contribute to successful computer-based virtual instrumentation adoption. The virtual instrumentation driver is the proliferation of high-performance, low-cost analog-to-digital ADC and digital-to-analog DAC converters. Applications such as wireless communication and high-definition video impact these technologies relentlessly. Virtual instrumentation hardware uses widely available semiconductors to deliver high-performance measurement front ends.
Finally, system design software that provides an intuitive interface for designing custom instrumentation systems furthers virtual instrumentation. Various interface standards are used to connect external devices to the computer. PC is the dominant computer system in the world today. Virtual instrumentation delivers this capability in the form of modularity within scalable hardware platforms.
Virtual instrumentation is software-based; if we can digitize it, we can measure it. With the right software tool, engineers and scientists can efficiently create their own applications by designing and integrating the routines that a particular process requires. You can also create an appropriate user interface that best suits the purpose of the application and those who will interact with it. You can define how and when the application acquires data from the device, how it processes, manipulates and stores the data, and how the results are presented to the user.
With powerful software, we can build intelligence and decision-making capabilities into the instrument so that it adapts when measured signals change inadvertently or when more or less processing power is required. An important advantage that software provides is modularity. When dealing with a large project, engineers and scientists generally approach the task by breaking it down into functional solvable units.
We can design a virtual instrument to solve each of these subtasks, and then join them into a complete system to solve the larger task. The ease with which we can accomplish this division of tasks depends greatly on the underlying architecture of the software. A virtual instrument is not limited or confined to a stand-alone PC.
In fact, with recent developments in networking technologies and the Internet, it is more common for instruments to use the power of connectivity for the purpose of task sharing. Typical examples include supercomputers, distributed monitoring and control devices, as well as data or result visualization from multiple locations. Every virtual instrument is built upon flexible, powerful software by an innovative engineer or scientist applying domain expertise to customize the measurement and control application.
The result is a user-defined instrument specific to the application needs. Virtual instrumentation software can be divided into several different layers like the application software, test and data management software, measurement and control services software as shown in Figure 1.
Most people think immediately of the application software layer. This is the primary development environment for building an application. Above the application software layer is the test executive and data management software layer. This layer of software incorporates all of the functionality developed by the application layer and provides system-wide data management. It is one of the most crucial elements of rapid application development. This software connects the virtual instrumentation software and the hardware for measurement and control.
This software offers optimized integration with both hardware and application development environments. It has gradually increased addressable applications through continuous innovation and hundreds of measurement hardware devices. The benefits that have accelerated test development are beginning to accelerate control and design.
As the pace of innovation has increased, so too has the pressure to get new, differentiated products to market quickly. Consumer expectations continue to increase; in electronics markets, for example, disparate function integration is required in a small space and at a low cost.
All of these conditions drive new validation, verification and manufacturing test needs. A test platform that can keep pace with this innovation is not optional; it is essential. The platform must include rapid test development tools adaptable enough to be used throughout the product development flow.
The need to get products to market quickly and manufacture them efficiently requires high-throughput test. To test the complex multifunctional products that consumers demand requires precise, synchronized measurement capabilities. And as companies incorporate innovations to differentiate their products, test systems must quickly adapt to test the new features.
Virtual instrumentation is an innovative solution to these challenges. It combines rapid development software and modular, flexible hardware to create user-defined test systems. Virtual instrumentation delivers as shown in Figure 1. This degree of user-configurability and transparency will change the way engineers build test systems. PCs bring greater software flexibility and capability, while PLCs deliver outstanding ruggedness and reliability.
But as control needs become more complex, there is a recognized need to accelerate the capabilities while retaining the ruggedness and reliabilities. Independent industry experts have recognized the need for tools that can meet the increasing need for more complex, dynamic, adaptive and algorithm-based control.
Logic, motion and other function integrations are a requirement for increasingly complex control approaches. Issues discovered in the testing phase require a design-phase reiteration as shown in Figure 1.
In reality, the development process has two very distinct and separate stages—design and test—which are two individual entities. On the design side, Electronic Design Automation EDA tool vendors undergo tremendous pressure to interoperate from the increasing semiconductor design and manufacturing group complexity requirements.
Engineers and scientists are demanding the capability to reuse designs from one tool in other tools as products go from schematic design to simulation to physical layout. Similarly, test system development is evolving towards a modular approach. Traditionally, this is the stage where the product designer uses benchtop instruments to sanity-check the physical prototypes against their design for correctness. The designer makes these measurements manually, probing circuits and looking at the signals on instruments for problems or performance limitations.
As designs iterate through this build-measure- tweak-rebuild process, the designer needs the same measurements again. In addition, these measurements can be complex—requiring frequency, amplitude and temperature sweeps with data collected and analyzed throughout.
Because these engineers focus on design tools, they are reluctant to invest in learning to automate their testing. Systems with intrinsic-integration properties are easily extensible and adapt to increasing product functionality. When new tests are required, engineers simply add new modules to the platform to make the measurements. Virtual instrumentation software flexibility and virtual instrumentation hardware modularity make virtual instruments a necessity to accelerate the development cycle.
With virtual instruments, we can quickly develop a program, take measurements from an instrument to test a prototype and analyze results—all in a fraction of the time required to build tests with traditional instruments. When we need flexibility, a scalable open platform is essential, from the desktop to embedded systems to distributed networks.
Whether we need to interface stand-alone instruments using GPIB or directly acquire signals into the computer with a data acquisition board and signal conditioning hardware, virtual instrumentation software makes integration simple. With virtual instruments, we also can automate a testing procedure, eliminating the possibility of human error and ensuring the consistency of the results by not introducing unknown or unexpected variables.
For automated design verification testing, one can create test routines in virtual instrumentation software and integrate software such as National Instruments Test Stand, which offers powerful test management capabilities. One of the many advantages these tools offer across the organization is code reuse.
We develop code in the design process and then plug these same programs into functional tools for validation, test or manufacturing. These tools meet rigorous throughput requirements with a high-speed, multithreaded engine for running multiple test sequences in parallel. TestStand easily manages test sequencing, execution and reporting based on routines written in virtual instrumentation software. TestStand integrates the creation of test code in virtual instrumentation software.
TestStand also can reuse code created in research and development or design and validation. If we have manufacturing test applications, we can take full advantage of the work already done in the product life cycle. Manufacturing applications require software to be reliable, high in performance and interoperable.
By sharing code across the enterprise, manufacturing can use the same applications developed in research and development or validation, and integrate seamlessly with manufacturing test processes. Virtual instrumentation relies on commercial technologies for cost and performance advantages; it has also expanded to encompass more embedded and real-time capabilities. The option of using virtual instrumentation as a scalable framework that extends from the desktop to embedded devices should be considered a tool in the complete toolbox of an embedded systems developer.
Ethernet now dominates as the standard network infrastructure for companies worldwide. In addition, the popularity of the Web interface in the PC world has overflowed into the development of cell phones, PDAs, and now industrial data acquisition and control systems. Embedded systems at one time meant stand-alone operation, or at most interfacing at a low level with a real-time bus to peripheral components.
The increased demand for information at all levels of the enterprise and in consumer products requires you to network embedded systems while continuing to guarantee reliable and often real-time operation. Virtual instrumentation software can combine one development environment for both desktop and real-time systems using cross-platform compiled technology; you can capitalize on the built-in Web servers and easy-to-use networking functionality of desktop software and target it to real-time and embedded systems.
This procedure happens with no additional programming required on the embedded system. You then can deploy that embedded system, power it, connect to the application from a remote secure machine via Ethernet, and interface to it using a standard Web browser. The evolution of these commercial technologies will propel virtual instrumentation into being more applicable to a growing number of applications. Leading companies that provide virtual instrumentation software and hardware tools need to invest in expertise and product development to serve this growing set of applications.
Virtual instrumentation software platform, LabVIEW, includes the ability to scale from development for desktop operating systems, to embedded real- time systems to handheld personal digital assistant targets, to FPGA-based hardware, and even to enabling smart sensors.
Next-generation virtual instrumentation tools need to include networking technology for quick and easy integration of Bluetooth, wireless Ethernet and other standards.
In addition to using these technologies, virtual instrumentation software needs a better way to describe and design timing and synchronization relationships between distributed systems in an intuitive way to help faster development and control of these often embedded systems.
The virtual instrumentation concepts of integrated software and hardware, flexible modular tools, and the use of commercial technologies combine to create a framework upon which we can rapidly complete our systems development and also maintain them for the long term.
Because virtual instrumentation offers so many options and capabilities in embedded development, it makes sense for embedded developers to understand and review these tools. While the original application of replacing the controls with a computer link used a command line interface, the use of sophisticated GUI became an essential component in the later versions of VI software. The major developments that helped VI become successful were development of low cost computer systems of adequate computing power, evolution of good GUI, development of standards for buses, and increasingly stable networking platforms.
The computing power of the processors improved by leaps and bounds permitting the development of all these resource intensive techniques. Standardization and progress in computing hardware increased. Developments of various interfacing standards lead to a massive reduction in development effort. All these developments have occurred in parallel and have taken us to the situation where VI is the dominant tool for the development and implementation of instrumentation applications and systems.
In , National Instruments began to search for a way to minimize the time needed to program instrumentation systems. LabVIEW 2 was released in , and was a compiled package as against an interpreted package. The first reasonably stable graphical environment Windows 3.
LabVIEW 3 programs written on one platform could run on another. LabVIEW 4, released in , featured a more customizable development environment so that users could create their own workspace to match their industry, experience level and development habits. In addition, LabVIEW 4 added high- powered editing and debugging tools for advanced instrumentation systems, as well as OLE-based connectivity and distributed execution tools.
Networking support on smaller systems was first introduced in Version 5. LabVIEW 5 and 5. Version 7 has expanded the horizon to make it simpler for the inexperienced user by providing various Express utilities and Assistants. LabVIEW RT is a hardware and software combination that allows you to take portions of your LabVIEW code and download them to be executed on a separate controller board with its own real-time operating system.
LabVIEW 8. With the enhanced releases of LabVIEW graphical programming software, system-level engineers as well as domain experts with little to no embedded expertise can accurately work with systems of increased complexity and scale, thereby, drastically reducing the time from concept to prototype.
Graphical programming is easier and more intuitive to use than traditional textual programming. Textual programming requires the programmers to be reasonably proficient in the programming language.
Non-programmers can easily learn the graphical approach faster at less amount of time. The main advantage of textual languages like C is that they tend to have faster graphical approach execution time and better performance than graphical programs.
Textual programming environments are typically used in determining high throughput virtual instrumentation systems, such as manufacturing test systems.
Graphical environments are better for nonprogrammers and useful for developing virtual instruments quickly and need to be reconfigured rapidly. Virtual instrumentation is not limited to graphical programming but can be implemented using a conventional programming language.
The most important task is to understand how to use standard analysis packages that can directly input data from the instruments and can be used to analyze, store and present the information in a useful format. Irrespective of whether it is classical or graphical environment any system with a graphical system design can be looked at as being composed of two parts—the user interface and the underlying code.
The code in a conventional language like C comprises a number of routines while in the graphical language G it is a collection of icons interconnected by multi-colored lines. Table 1. TABLE 1. EXE or. What is graphical system design? With a neat block diagram explain its functionalities. Draw and explain the virtual instrumentation model and graphical system design model.
Draw a block diagram of a typical embedded system software and hardware design flow and compare with stream-lined development flow with graphical system design. Explain with a block diagram the general basic components of high level instruments. What is virtual instrumentation? Draw and explain the basic difference between the traditional instruments and software-based virtual instruments.
Draw and explain the layers of virtual instrumentation software and the software role. Explain with a block diagram how simulation test plays a critical role in the design and manufacture of a product. Compare text-based programming and graphical programming. It is a powerful and versatile analysis and instrumentation software system for measurement and automation.
Its graphical programming language called G programming is performed using a graphical block diagram that compiles into machine code and eliminates a lot of the syntactical details. LabVIEW offers more flexibility than standard laboratory instruments because it is software based.
Using LabVIEW, the user can originate exactly the type of virtual instrument needed and programmers can easily view and modify data or control inputs. LabVIEW programs are called virtual instruments VIs , because their appearance and operation imitate physical instruments like oscilloscopes. LabVIEW is designed to facilitate data collection and analysis, as well as offers numerous display options. With data collection, analysis and display combined in a flexible programming environment, the desktop computer functions as a dedicated measurement device.
LabVIEW contains a comprehensive set of VIs and functions for acquiring, analyzing, displaying, and storing data, as well as tools to help you troubleshoot your code. Express VIs are specifically designed for measurement analysis, including filtering and spectral analysis. Using LabVIEW, you can create test and measurement, data acquisitions, instrument control, datalogging, measurement analysis, and report generation applications.
With Express technology, thousands of nonprogrammers have taken advantage of the LabVIEW platform to build automated systems quickly and easily. In fact, the full-featured LabVIEW programming language has the same constructs that traditional languages have such as variables, data types, objects, looping and sequencing structures, as well as error handling. LabVIEW applications are portable across platforms. Complete instrumentation libraries can be created for less than the cost of a single traditional, commercial instrument.
They also need to have maintainable, extensible solutions that can be used for a long time. By creating virtual instruments based on powerful development software such as LabVIEW, you inherently design an open framework that seamlessly integrates software and hardware. This ensures that your applications not only work well today but that you can easily integrate new technologies in the future. This open language takes advantage of existing code; can easily intergrate with legacy systems and incorporate third party software with.
With powerful server technology you can offload processor- intensive routines to other machines for faster execution, or create remote monitoring and control applications.
Reconfiguring attributes of the data presentation, such as colours, font size, graph types, and more can be easily performed. In order to use a VI as a subVI in the block diagram of another VI, it is essential that it contains an icon and a connector. The two LabVIEW windows are the front panel containing controls and indicators and block diagram containing terminals, connections and graphical code.
The front panel is the user interface of the virtual instrument. The code is built using graphical representations of functions to control the front panel objects. The block diagram contains this graphical source code. Controls are knobs, push buttons, dials and other input devices. Indicators are graphs, LEDs and other displays. After you build the user interface, you can add code using VIs and structures to control the front panel objects.
The block diagram contains this code. In some ways, the block diagram resembles a flowchart. The front panel is the interactive user interface for the VI. It is named a front panel because it stimulates the front panel of a physical instrument. Build the front panel with controls and indicators as shown in Figure 2. The front panel can include knobs, push buttons, graphs and various other controls which are user inputs and indicators which are program outputs. Controls are inputs used to simulate instrument input devices and supply data to the block diagram of the VI, and indicators are outputs displays used to simulate instrument output devices and display data the block diagram acquires or generates.
The front panel is customized to emulate control panels of traditional instruments, create custom test panels, or visually represent the control and operation of processes. Front panel objects appear as terminals on the block diagram and the components wired together. After the front panel is built, codes are added using graphical representations of functions in the block diagram to control the front panel objects.
The block diagram contains the graphical source code composed of nodes, terminals, and wires. The block diagram is the actual executable program as shown in Figure 2. The components of a block diagram are lower-level VIs, built-in functions, constants and program execution control structures. Wires have to be drawn to connect the corresponding objects together to indicate the flow of data between each of them.
Front panel objects have analogous terminals on the block diagram so that data can pass easily from the user to the program and back to the user. Block diagram objects include the terminals, subVIs, functions, constants, structures and wires. LabVIEW is the easiest, most powerful tool for acquiring, analyzing and presenting real-world data. Terminals are entry and exit ports that exchange information between the panel and the diagram.
Terminals are analogous to parameters and constants in text-based programming languages. Right-click the block diagram objects and select View As icon to change the icon view. Every VI displays an icon in the upper-right corner of the front panel and block diagram windows. An icon is a graphical representation of a VI. The icon can contain both text and images.
To use a VI as a subVI, you need to build a connector pane. The connector pane is a set of terminals that correspond to the controls and indicators of that VI. To open a new project from the Getting Started window, select the Empty Project option. A new, unnamed project opens, and you can add files to and save the project. A blank VI opens a blank front panel and blank block diagram.
You also can display the New dialog box by clicking the New link in the Getting Started window. To save a new VI, select File»Save. Click the following toolbar buttons and pull-down menu to run and edit a VI.
TABLE 2. While the VI runs, the Run button appears as shown. Click this button to display the Error list window, which lists all errors and warnings. Run Continuously button: To run the VI until you abort or pause execution.
Click the button again to disable continuous running. Pause button: To pause a running VI. Text Settings: To change the font settings including size, style, colour. Align Objects: To align objects along axes, including vertical, top edge, left. Distribute Objects: To space objects evenly, including gaps, compression. Resize Objects: To resize multiple front panel objects to the same size. Reorder: When you have objects that overlap each other and you want to define which one is in front or back of another, select one of the objects with the positioning tool and then select from Move Forward, Move Backward, Move To Front, and Move To Back.
Type: Remind you that a new value is available to replace an old value. Click the following buttons on the block diagram toolbar to debug the VI. See the flow of data through the block diagram. Click the button again to disable execution highlighting.
Retain Wire Values: To save the wire values at each point in the flow of execution so that when you place a probe on the wire, you can immediately retain the most recent value of the data that passed through the wire. You must successfully run the VI at least once before you are able to retain the wire values. Step Into: To open a node and pause. When you click the Step Into button again, it executes the first action and pauses at the next action of the subVI or structure.
Single-stepping through a VI steps through the VI node by node. Each node blinks to denote when it is ready to execute. By stepping into the node, you are ready to single-step inside the node.
Step Over: To execute a node and pause at the next node. By stepping over the node, you execute the node without single-stepping through the node. Step Out: To finish executing the current node and pause. When the VI finishes executing, the Step Out button becomes dimmed. By stepping out of a node, you can complete single-stepping through the node and navigate to the next node.
A warning indicates there is a potential problem with the block diagram, but it does not stop the VI from running. The three palettes are the Tools, Controls, and Functions palettes.
You can create, modify, and debug VIs using the tools located on the floating Tools palette. A tool is a special operating mode of the mouse cursor. The cursor corresponds to the icon of the tool selected in the Tools palette. Use the tools to operate and modify the front panel and block diagram objects. You can manually choose the tool you need by selecting it on the Tools palette. Or select View»Tools Palette to display the Tools palette. Table 2.
If automatic tool selection is enabled and you move the cursor over objects on the front panel or block diagram, LabVIEW automatically selects the corresponding tool from the Tools palette. Operating tool: To change the values of a control or select the text within a control. This tool changes to the icon shown at right when it moves over a text control, such as a numeric or string control.
Positioning tool: To select, move, or resize objects and it changes to resizing handles when it moves over the edge of a resizable object. Labeling tool: To edit text and create free labels. This tool changes to the icon on the right when you create free labels. Wiring tool: To wire objects together on the block diagram. Object Shortcut Menu tool: To access an object shortcut menu with the left mouse button. Scrolling tool: To scroll through windows without using scrollbars.
Breakpoint tool: To set breakpoints on VIs, functions, nodes, wires, and structures to pause execution at that location. Probe tool: To create probes on wires on the block diagram. Use the Probe tool to check intermediate values in a VI that produces questionable or unexpected results. Color Copy tool: To copy colors for pasting with the Coloring tool. Coloring tool: To color an object.
It also displays the current foreground and background color settings. The Controls palette contains the controls and indicators which you can use to create the front panel. The Controls palette can be accessed from the front panel by selecting View»Controls Palette or by right-clicking an open space on the front panel window to display the Controls palette.
The Controls palettes contain subpalettes of objects which you can use to create a VI. When you click a subpalette icon, the entire palette changes to the subpalette you selected. To use an object on the palettes, click the object and place it on the front panel. Figure 2. In search mode, you can perform text-based searches. Use the Options button on the Controls or Functions palette toolbar to change to another palette view or format.
Up to Owning palette—Navigates up one level in the palette hierarchy. The Functions palette as shown in Figure 2. You can access the Functions palette from the block diagram by selecting View»Functions Palette. You can also right-click an open space on the block diagram to display the Functions palette.
The VIs and functions located on the Functions palette depend on the palette view currently selected. The VIs and functions are located on subpalettes based on the types of VIs and functions. To access the shortcut menu right-click the object and change the look or behavior of front panel and block diagram objects.
The most often- used menu is the object shortcut menu. All LabVIEW objects and empty space on the front panel and block diagram have associated shortcut menus.
Use the shortcut menu items to change the look or behavior of front panel and block diagram objects. To access the shortcut menu, right-click the object, front panel or block diagram. To access the shortcut menu, right-click the object.
Right-click the label as shown in Figure 2. Right-click the digital display to access its shortcut menu as shown in Figure 2. The shortcut menu for a meter is shown in Figure 2. You can use the shortcut menu to create constants, controls and indicators. Right-click a function terminal and select Create»Constant, Create»Control, or Create»Indicator from the shortcut menu to create. To replace nodes, right-click the node and select Replace from the shortcut menu.
Right-click the front panels object and select Properties from the shortcut menu to access the property dialog box for an object. The options available on the property dialog box for an object are similar to the options available on the shortcut menu for that object.
Controls simulate instrument input devices and supply data to the block diagram of the VI. Indicators simulate instrument output devices and display data the block diagram acquires or generates. Every control or indicator has a data type associated with it. They are numeric data type, Boolean data type and string data type as shown in Figure 2.
The numeric data type shown in Figure 2. The two most commonly used numeric objects are the numeric control and the numeric indicator. Use Boolean controls and indicators to enter and display Boolean True or False values. Boolean objects simulate switches, push buttons, and LEDs. Use string controls to receive text from the user such as a password or user name and indicators to display text to the user. Terminals are entry and exit ports that exchange information between the front panel and block diagram.
Types of terminals include control or indicator terminals and node terminals. Control and indicator terminals belong to front panel controls and indicators. Data you enter into the front panel controls A and B in the figure enter the block diagram through the control terminals.
The data then enter the Add and Subtract functions. When the Add and Subtract functions complete their calculations, they produce new data values. The data values flow to the indicator terminals, where they update the front panel indicators.
The terminals represent the data type of the control or indicator. You can configure front panel controls or indicators to appear as icon or data type terminals on the block diagram.
By default, front panel objects appear as icon terminals. For example, a numeric icon terminal, shown in Figure 2. A DBL terminal represents a double-precision, floating-point numeric control.
To display a terminal as a data type on the block diagram, right-click the terminal and select View As Icon from the shortcut menu. They are analogous to statements, operators, functions, and subroutines in text-based programming languages. Nodes can be functions, subVIs or structures. Structures are process control elements, such as Case structures, For loops, or While loops. The Add and Subtract functions in the previous figure are function nodes.
The time has come for a new approach to electronic system design. A build specification contains all the settings for the build, such as files to include, directories to create and settings for directories of VIs.
Toggle automatic wiring by pressing the spacebar while you move an object using the Positioning tool. Creating a subVI from a selection is convenient but still requires careful planning to create a logical hierarchy of VIs. There is a wide variety of hardware devices available which we can either plug into the computer or access through a network. Industries with automated processes, such as chemical or manufacturing plants use virtual instrumentation with the goal of improving system productivity, reliability, safety, optimization and stability.
LabVIEW is the easiest, most powerful tool for acquiring, analyzing and presenting real-world data. In this example 10 different pictures consists of 10 different actions of a dog at running state is taken for animation. Explain how to create setting required, recommended, and optional inputs and outputs in creating terminals of a SubVI. Nodes can be functions, subVIs or structures. A software platform which integrates multiple models of computation minimizes the time to implement specifications into a design.
The laview and connector pane correspond to the function prototype in text-based programming languages. Use the Copy from option on the right side of the Icon Editor dialog box to copy from a color icon to a black-and-white icon and vice versa. Solution To find the decimal equivalent of a binary number, first create the front panel and the block diagram as given in Figures P3. They also break the llabview programming paradigm.
Any VI has the potential to be used as a subVI.
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