Using Multiport in Simulink for Signal Selection

Using Multiport in Simulink for Signal Selection

1. Setting Up the Model in Simulink

Creating a New Model

1. Open MATLAB and Simulink

• Launch MATLAB and open Simulink by clicking on the Simulink icon.

1. Create a Blank Model

• Click on "Blank Model" to start a new project.

Adding Components

1. Insert a Multiport Switch

• Go to the "Library Browser" and navigate to "Signal Routing."

• Drag and drop the "Multiport Switch" block into your model.

1. Configure the Multiport Switch

• The Multiport Switch block consists of two types of ports:

• Control Port: Determines which input is selected.

• Data Ports: The actual inputs to choose from.

• By default, there are three data ports, but you can adjust this to your needs.

2. Connecting Inputs and Outputs

Setting Up Signal Inputs

1. Add Input Signals

• For demonstration, add three different signal sources:

• Sine Wave: Set the frequency to 1 kHz and amplitude to 1.

• Triangular Wave: Set the frequency to 1 kHz and amplitude to 1.

• Square Wave: Set the frequency to 1 kHz and amplitude to 1.

• Connect these signals to the data ports of the Multiport Switch.

1. Add a Control Signal

• Use a "Repeating Sequence" block to generate the control signal.

• Configure it to output values in a sequence (e.g., 1, 2, 3, 2, 1) with a sample time of 2 seconds.

1. Connect the Control Signal

• Connect the output of the Repeating Sequence block to the control port of the Multiport Switch.

Setting Up the Scope

1. Add a Scope Block

• Drag and drop the "Scope" block into your model.

• Connect the output of the Multiport Switch to the scope to visualize the selected signal.

1. Configure the Scope

• Set up the scope with two layouts to view both the control input and the output.

• Adjust the scale and style as needed for clarity.

3. Running the Simulation

Configure Simulation Settings

1. Adjust Simulation Parameters

• Go to "Model Configuration Parameters."

• Set the maximum step size to 1e-5 for better accuracy.

1. Run the Simulation

• Click the "Run" button to start the simulation.

• Observe the results in the scope.

Results and Discussion

1. Observing Output Changes

• When the control signal is 1, the output will be the sine wave.

• When the control signal is 2, the output will be the triangular wave.

• When the control signal is 3, the output will be the square wave.

• The Multiport Switch routes the selected input based on the control signal, allowing you to see the different waveforms as specified.

1. Output Analysis

• The scope will display the selected signal based on the control input, demonstrating how the Multiport Switch routes different signals effectively.