Ni Automatic Error Handling
Contents |
Users can encounter errors in even the most reliable VIs. Without a mechanism to check for errors, you can only know that a VI does not work properly. Error checking identifies why and labview error handling examples where errors occur in your VI. For example, one common situation in which labview error handling best practices you can encounter errors occurs when you perform any kind of input and output (I/O). Almost all I/O functions return error
General Error Handler Labview
information. Include error checking in VIs, especially for I/O operations (file, serial, instrumentation, data acquisition, and communication), and provide a mechanism to handle errors effectively. Automatic Error Handling By default, LabVIEW automatically handles any
Labview Simple Error Handler
error when a VI runs by suspending execution, highlighting the subVI or function where the error occurred, and displaying an error dialog box. Note The LabVIEW Run-Time Engine does not support automatic error handling. Disabling Automatic Error Handling You also can disable automatic error handling in preference of other error handling methods. For example, if an I/O VI on the block diagram times out, you may wight want the VI labview error in no error to retry for a certain period of time instead of allowing automatic error handling to stop the application and display an error dialog box. You can implement custom error handling on the block diagram of the VI. Refer to the following table for information about how to disable automatic error handling for different types of VIs. Type of VI Disabling Automatic Error Handling Current VI Select File»VI Properties. Then select Execution from the Category pull-down menu and remove the checkmark from the Enable automatic error handling checkbox. New, blank VIs Select Tools»Options. Then select Block Diagram from the Category list and remove the checkmark from the Enable automatic error handling in new VIs checkbox. SubVI or function within a VI Create an error out indicator in the subVI or wire the error out parameter of that subVI to the error in input of another subVI or function. Other Methods of Error Handling Error handling in LabVIEW follows the dataflow model, similar to how data values flow through a VI. Wire the error information from the beginning of the VI to the end. Include an error handler VI at the end of the VI to determine if the VI ran without errors. Use the error
are in the VI you create, you cannot predict every problem a user can encounter. Without a mechanism to check for errors, you know only that the VI does not work properly. Error checking tells you why and where errors occur. When you perform any kind of input and output (I/O), consider the possibility that errors might occur. Almost all I/O functions return error information. Include error checking in VIs, especially for I/O operations (file, serial, instrumentation, data acquisition, and communication), and provide a mechanism to handle errors appropriately. By default, LabVIEW automatically handles http://zone.ni.com/reference/en-XX/help/371361L-01/lvconcepts/error_checking_and_error_handling/ any error when a VI runs by suspending execution, highlighting the subVI or function where the error occurred, and displaying an error dialog box. To disable automatic error handling for the current VI, select File»VI Properties and select Execution from the Category pull-down menu. To disable automatic error handling for any new, blank VIs you create, select Tools»Options and select Block Diagram from the Category list. http://zone.ni.com/reference/en-XX/help/371361K-01/lvconcepts/error_checking_and_error_handling/ To disable automatic error handling for a subVI or function within a VI, wire its error out parameter to the error in parameter of another subVI or function or to an error out indicator. You can choose other error handling methods. For example, if an I/O VI on the block diagram times out, you might not want the entire application to stop and display an error dialog box. You also might want the VI to retry for a certain period of time. In LabVIEW, you can make these error handling decisions on the block diagram of the VI. Use the LabVIEW error handling VIs and functions on the Dialog & User Interface palette and the error in and error out parameters of most VIs and functions to manage errors. For example, if LabVIEW encounters an error, you can display the error message in different kinds of dialog boxes. Use error handling in conjunction with the debugging tools to find and manage errors. VIs and functions return errors in one of two ways—with numeric error codes or with an error cluster. Typically, functions use numeric error codes, and VIs use an error cluster, usually with error
Close Module 2 LabVIEW Environment Module 2 LabVIEW Environment Learning Objectives LabVIEW Environment Tour Next Creating a New Project Close Module 3 Front Panel Module 3 Front Panel Learning Objectives Front Panel http://www.learnni.com/getting-started/Home/Index/52 Overview User Interfaces Adding Controls and Indicators Choosing Controls and Indicators Next Controls http://www.assignmenthelptutors.com/handling-errors-in-ni-labview.html Palette Close Module 4 Block Diagram Module 4 Block Diagram Learning Objectives Block Diagram Tour Next Block Diagram Components Completing a VI Close Module 5 Block Diagram Data Flow Module 5 Block Diagram Data Flow Learning Objectives Block Diagram Data Flow Data Flow Practice Data Flow Dependency Next Data Flow Practice Close Module error handling 6 Acquire, Analyze and Present Module 6 Acquire, Analyze and Present Learning Objectives LabVIEW VI Tasks Acquire Data Analyze Data Present Data Applications Configuring Express VIs Systems Possibilities Next Building a VI Close Module 7 Debugging Module 7 Debugging Learning Objectives Broken VIs Debugging Errors Unexpected Data Errors Highlight Execution Button Probe Run-Time Errors and Error Handling Automatic Error Handling Next Fixing Errors Close Module 8 Intro labview error handling to Loop Structures Module 8 Intro to Loop Structures Learning Objectives Intro to Loop Structures Advanced Loops While Loop Creating a While Loop Parts of a While Loop For Loops Example For Loop Visualizing For Loop Data Next Loop Structure Practice Close Module 9 Intro to Case Structures Module 9 Intro to Case Structures Learning Objectives Intro to Case Structures Big Picture Placing Case Structures Case Structure Function More on Case Structures Next Identifying Case Structures Close Module 10 Intro to Data Structures Module 10 Intro to Data Structures Learning Objectives Intro to Data Structures Complex Data Structures Arrays Array of Numeric Values Modify Arrays Displaying Array Data Example For Loop Clusters Creating Clusters Cluster Functions Next Identifying Data Structures Close Module 11 Next Steps Module 11 Next Steps Getting Started Next Steps Glossary Glossary Accelerometer Accelerometer A type of sensor that measures acceleration or vibration. Artificial data dependency Artificial data dependency Condition in a dataflow programming language in which the arrival of data, rather than it's value, triggers execution of a node. Array Array Ordered, indexed list of data elements of the same type. Array shell Array shell Front panel object that houses an array.
HelpOnline TutoringDissertation HelpRefund PolicyBlog Home Handling Errors in NI LabVIEW Handling Errors in NI LabVIEW No matter how confident you are in the VI you create, which you cannot predict every problem a user can encounter. Mechanism to check for errors, which we know only that VI does not work properly. The Error checking tells you why and where errors occur. Automatic Error Handling Each error has a numeric code and a corresponding error message. By default, the Lab VIEW automatically handles any error when a VI runs by suspending execution, highlighting the subVI or function where the error occurred, and displaying an error dialog box. To disable automatic error handling for the current VI, to select the File»VI Properties and select Execution from the Category pull-down menu. Disable automatic error handling for any new, blank VIs you create, select Tools» Options and select Block Diagram from the Category list. Disable automatic error handling for a subVI or function within VI, then wire its error out parameter to the error in parameter of another subVI or function or to an error out indicator. Explain Error When an error occurs, right-click within the cluster border and select Explain Error from the shortcut menu to open the Explain Error dialog box. Explain Error dialog box contains information about the error. Shortcut menu includes an Explain Warning option if the VI contains warnings but no errors. Assignmenthelptutors.com can assist you with all your Handling Errors in NI LabVIEW classes and Handling Errors in NI LabVIEW home works and projects. Our service is 24/7, so we are here all day and night to ensure your success. Assignmenthelptutors.com service is based on providing quality services for Handling Errors in NI LabVIEW assignments. Assignmenthelptutors.com presents: 24x7 Availability Trained and Certified Experts Deadline Guaranteed Plagiarism Free Privacy Guaranteed Online help for all Projects Reference style, Harvard, APA, AMA, MLA, IEEE