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Sunday, October 24, 2021

LabVIEW Multisim API Toolkit - RLC Values Example

Automate your Multisim design in LabVIEW 

Written by: Larsha Johnson
Date: October 24th, 2021

If you like designing electronic circuits in Multisim and would like to automate the simulation and analyses in LabVIEW, this example will walk you through how it can be done. The link below may help with missing NI module, Toolkit, or driver warning when opening VI errors.

Multisim Toolkit with LabView

The Multisim Automation API and the LabVIEW Multisim API Toolkit (which uses the API) recognize and can be used to control the values of all circuit parameters in the design. This lets you control most component parameters from the API.

This example uses Multisim version 14.2 and LabVIEW 2021

First open Multisim file RLC values from the blue sample folder → LabView Multisim API Toolkit.

















After the file is loaded into Multisim workspace, open LabVIEW, click the "File" tab and open the RLC Values vi as shown.









The simulation should run from here if all the necessary NI Modules, toolkits, and drivers are installed correctly. However, we will explore further by clicking the "Windows" tab and opening the associated block diagram. *The original design was modified by removing the blocks section "Multisim preparation" and replaced with a single "Select File Path" block form the Multisim Add-on tab. 

💬This may differ depending on software version.


If any errors should occur, in this diagram by block location is where they will be listed. From the LabVIEW front panel or from the block diagram, press the white arrow icon to run the simulation on the Multisim RLC Values circuit. 


This demonstrates how to sweep a resistor value to calculate a phase shift plot. (set to R2 by default)

In Multisim alternative analyses and simulations can be performed such as "Parameter Sweep", "Transfer Function", and "Pole Zero" to name a few.



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If you have errors visit this link: NI LABS TOOLKITS or comment if you find solutions to help others.

https://www.ieee.li/pdf/viewgraphs/circuit_design_simulation_and_virtual_instrumentation.pdf


Monday, September 27, 2021

Traffic Light in NI Multisim using Programmable Logic Devices (PLD)

Traffic Light in Multisim using PLC

Written by Larsha Johnson
9/27/2021

Programmable Logic Devices (PLDs) are integrated circuits that contain a relatively small number of functional elements that provide user-configurable logic functions (AND, OR, etc.)
In Multisim a PLD schematic contains specialized components that define the operation of the individual logic blocks of the PLD.

What is PLC and PLD?

The biggest difference between the two is the control logic. PLC is a fixed logic device (the function is realized by changing the software), and PLD is a variable logic device (the function is realized by changing the internal circuit structure). 

The concepts of PLC and PLD can be practiced through this two-way traffic light example. The main implementation of traffic light signals in to avoid traffic jams and serves the purpose of avoiding vehicular collisions.

The ladder diagram in this blog runs two traffic lights. The ladder diagram is contained in a separate hierarchical block called TrafficLightLogic

There are two different traffic light examples available, look in the sample circuit "blue folder icon" in the Educational version of Multisim that implements a traffic light:


  1. National Instruments\Circuit Design Suite 14.2\samples\Educational Sample Circuits\Ladder Diagrams
  2. National Instruments\Circuit Design Suite 14.2\samples\PLD Sample Circuits

The first choice uses programmable ladder logic with an actual traffic light simulation. For choice two, you can export the sample to program the NI Digital Electronics FPGA Board.

                     TrafficLightPLC.pngTrafficLightSim_snippet.png

Drag n drop these snippets directly into your Multisim workspace :slightly_smiling_face:

*I also attached a short version of the NI Multisim for Education PDF specifically for traffic light designs.


What is an SNIPPET file? Section of programming code saved in XML format; code snippets can be saved from Visual Basic, Visual C#, and Visual J projects; they can be edited using the Code Snippet Editor and managed using the Code Snippets Manager. 


Find the attached files below. Hope this helps!

This topic refers to education-specific features of Multisim.

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