myRIO Project

The myRIO Project template provides a starting point for creating NI myRIO applications. The design of this template makes it easy to access NI myRIO I/O channels and onboard devices without making major modifications to the structure of the application.

System Requirements

Development System

• LabVIEW Full or Professional Development System
• LabVIEW myRIO Toolkit
• LabVIEW Real-Time Module

Hardware

• NI myRIO

Overview

This template uses a Flat Sequence structure that executes the following three frames from left to right:

1. Initialize—Initializes the application. Use this frame to initialize user interface elements like controls and indicators, variables, and the NI myRIO hardware. Initialization is not required for every application.
2. Acquire and process data—Acquires data from the NI myRIO and processes the data for presentation. The While Loop repeats the code until you click Stop or an error occurs.
3. Close—Cleans up user interface elements and variables, and resets the hardware output values to zero before the application exits. Closing code is optional.

Running This Template

1. In the Project Explorer window, open myRIO-1900/myRIO-1950»Main.vi.
2. Click Run. This application reads the value from the user button on the NI myRIO and uses the Boolean indicator to display the value. The TRUE and FALSE states of the Boolean indicator represent the ON and OFF states of the user button.
3. Press the user button on the NI myRIO and observe the state change of the Button Value indicator.
4. Click Stop to stop the application.

Modifying This Template

Determining Your Needs

Before you customize this template for your own application, ask yourself the following questions:

• What kind of I/O channel will this application need to access? The answer to this question determines the myRIO VIs you need to use.
• What kind of data will this application need to access? The answer to this question determines what data you initialize in the Initialize frame.
• What are some errors that could occur, and how should the application respond to these errors? The answers to these questions determine the amount of error handling you need.

Controlling the Order of Execution

This template uses the Flat Sequence structure to execute frames from left to right when all data values wired to a frame are available. The data leaves each frame as the frame finishes executing. Use sequence structures sparingly when you modify this template. Rely on data dependency or flow-through parameters to control the order of execution.

Adding Initialization Code

In the Initialize frame, add code that initializes your application. For example, you may want to initialize the data to specific values, open a file for logging, and so on.

Modifying the Data Acquisition and Processing Code

By default, this template uses the Button Express VI to read the value from the onboard user button and uses a Boolean indicator to display the button value. You can add your own code to acquire data from the NI myRIO and process the data based on your application needs. The myRIO Toolkit provides Express VIs and Low Level VIs for you to access I/O channels and the onboard devices.

Adding Closing Code

In the Close frame, add code that executes after the data acquisition and processing is complete but before the application exits. Closing code commonly accomplishes the following tasks:

• Frees memory by closing any open references
• Flushes any buffers in use
• Resets the NI myRIO hardware

Note  The use of the Reset myRIO VI must be after the completion of all operations with the NI myRIO I/O channels. Otherwise, the Reset myRIO VI might return unexpected results.

Modifying Error Handling

By default, this template stops if the Button Express VI returns an error or when you click the Stop button. When you customize this template, you can use the error in and error out clusters in each VI you use to pass the error information through the VI. If you want to ignore errors, you can remove the OR Function and wire the Stop button directly to the conditional terminal of the While Loop.

Additional Resources

Refer to the LabVIEW Help, available by selecting Help»LabVIEW Help from LabVIEW, for information about LabVIEW concepts or objects used in this sample project. You also can use the Context Help window to learn basic information about LabVIEW objects as you move the cursor over each object. To display the Context Help window in LabVIEW, select Help»Show Context Help.

Refer to the myRIO sample projects, available from the Create Project dialog box, for examples of adapting this template to more complex applications.

Legal Information

Copyright

© 2014 National Instruments. All rights reserved.

Under the copyright laws, this publication may not be reproduced or transmitted in any form, electronic or mechanical, including photocopying, recording, storing in an information retrieval system, or translating, in whole or in part, without the prior written consent of National Instruments Corporation.

National Instruments respects the intellectual property of others, and we ask our users to do the same. NI software is protected by copyright and other intellectual property laws. Where NI software may be used to reproduce software or other materials belonging to others, you may use NI software only to reproduce materials that you may reproduce in accordance with the terms of any applicable license or other legal restriction.

End-User License Agreements and Third-Party Legal Notices

You can find end-user license agreements (EULAs) and third-party legal notices in the following locations after installation:

• Notices are located in the <National Instruments>\_Legal Information and <National Instruments> directories.
• EULAs are located in the <National Instruments>\Shared\MDF\Legal\license directory.
• Review <National Instruments>\_Legal Information.txt for information on including legal information in installers built with NI products.

U.S. Government Restricted Rights

If you are an agency, department, or other entity of the United States Government ("Government"), the use, duplication, reproduction, release, modification, disclosure or transfer of the technical data included in this manual is governed by the Restricted Rights provisions under Federal Acquisition Regulation 52.227-14 for civilian agencies and Defense Federal Acquisition Regulation Supplement Section 252.227-7014 and 252.227-7015 for military agencies.

IVI Foundation Copyright Notice

Content from the IVI specifications reproduced with permission from the IVI Foundation.

The IVI Foundation and its member companies make no warranty of any kind with regard to this material, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose. The IVI Foundation and its member companies shall not be liable for errors contained herein or for incidental or consequential damages in connection with the furnishing, performance, or use of this material.

Trademarks

Refer to the NI Trademarks and Logo Guidelines at ni.com/trademarks for information on National Instruments trademarks. Other product and company names mentioned herein are trademarks or trade names of their respective companies.

Patents

For patents covering the National Instruments products/technology, refer to the appropriate location: Help»Patents in your software, the patents.txt file on your media, or the National Instruments Patent Notice at ni.com/patents.