Operate Relays on NI Switch Modules by Relay Number

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Overview

The attached VIs allows you to control relays on NI switch modules using their unique relay numbers.

Description

These VIs allow relays to operate by number, rather than by the assigned software names. This could be useful to assign relay positions as part of a large array.  This is useful for all topologies, but is especially useful for SPDT relays. Both NI-DAQmx and NI-Switch compatible VIs are provided.

Requirements

Software

　　LabVIEW 2012 (or compatible)

　　NI Switch Driver 4.6 (or compatible), or DAQmx 9.6 (or compatible)

Hardware

　　NI switch module

Steps to Implement or Execute Code

1. Download the attached Zip File
2. Extract the files from the Zip File
3. Decide if you are using the NI-DAQmx or NI-Switch Driver. The following pictures and steps describe using the NI-Switch, although the steps are similar for using the NI-DAQmx
4. Open the NI-Switch folder
5. Open the Example.vi there:
   • Select your NI-Switch Module and the Relay Number and Run the VI.
   • Note you do not want to run the example each time you need to open and close a relay.  In your specific application open a switch session and then call the Opencloserelaybynumber.vi. For DAQmx simply drop the open close really whenever you need it. 
6. If you are unsure of what relay numbers correspond to what channels, please use the attached LookupRelayNumber.vi
   • To Use this VI simply select your NI-Switch module and run the VI.

Refer to the NI Switches Help for the valid channel names for your switch module.

I/O Connections Overview:

Refer to the NI Switches Getting Started Guide and NI Switches Help for information about connecting signals to your switch module.

Additional Information or References

  NI-Switch Example Block Diagram

NI-Switch Open Close Relay by Number Block Diagram

NI-Switch Look Up Relay Number Block Diagram

 

Note: This page includes switch code written with the switching palette of the NI-DAQmx driver. In the past, you were able to program NI switches with either the NI-DAQmx or NI-SWITCH driver. As of 2015, the NI-DAQmx switching palette is not recommended for new designs and NI strongly recommends using the NI-SWITCH driver for new designs. For more information, please review the following document: What Drivers Can I Use to Program My NI Switch Modules?

**This document has been updated to meet the current required format for the NI Code Exchange.**