This is machine translation

Translated by Microsoft
Mouseover text to see original. Click the button below to return to the English version of the page.

Note: This page has been translated by MathWorks. Click here to see
To view all translated materials including this page, select Country from the country navigator on the bottom of this page.


Tune parameter value with dial

  • Library:
  • Simulink / Dashboard


The Knob block tunes the value of the connected block parameter to during simulation. For example, you can connect the Knob block to a Gain block in your model and adjust its value during simulation. You can modify the range of the Knob block's scale to fit your data. Use the Knob block with other Dashboard blocks to create an interactive dashboard to control your model.

Connecting Dashboard Blocks

Dashboard blocks do not use ports to make connections. To connect Dashboard blocks to variables and block parameters in your model, use connect mode. Connect mode facilitates the process of connecting Dashboard blocks in your model, especially when you want to connect multiple blocks at once. If you only want to connect a single Dashboard block, you can also use the Connection table in the block dialog box to make the connection.


Dashboard blocks cannot connect to variables until you update your model diagram. To connect Dashboard blocks to variables or modify variable values between opening your model and running a simulation, update your model diagram using Ctrl+D.

To enter connect mode, click the Connect button that appears above your unconnected Dashboard block when you pause on it.

In connect mode, when you select one or more signals or blocks, a list of parameters and signals available for connection appears. Select a signal or parameter from the list to connect the selected Dashboard block. To connect another Dashboard block, pause on the block and click the Connect button above it. Then, make a selection of signals and blocks in your model, and choose a signal or parameter to connect.

When you finish connecting the Dashboard blocks in your model, click the Exit button in the upper-right of the canvas to exit connect mode.

Parameter Logging

Tunable parameters connected to Dashboard blocks are logged to the Simulation Data Inspector, where you can view parameter values along with logged signal data. You can access logged parameter data in the MATLAB® workspace by exporting the parameter data from the Simulation Data Inspector UI or by using the Simulink.sdi.exportRun function. For more information about exporting data with the Simulation Data Inspector UI, see Export Data from the Simulation Data Inspector. The parameter data is stored in a Simulink.SimulationData.Parameter object, accessible as an element in the exported Simulink.SimulationData.Dataset.


  • Dashboard blocks can only connect to real scalar signals.

  • You cannot use the Connection table to connect a Dashboard block to a block that is commented out. When you connect a Dashboard block to a commented block using connect mode, the Dashboard block does not display the connected value until the you uncomment the block.

  • Dashboard blocks cannot connect to signals inside referenced models.

  • Parameters specified by indexing a variable array do not appear in the Connection table. For example, a block parameter defined as engine(1) using the variable engine does not appear in the table.

    To access the parameter in the Connection table, assign the indexed value to a scalar variable, such as engine_1. Then, use the scalar variable to define the block parameter.


expand all

Select the variable or block parameter to control using the Connection table. Populate the Connection table by selecting one or more blocks in your model. Select the radio button next to the variable or parameter you want to control, and click Apply.


To see workspace variables in the connection table, update the model diagram using Ctrl+D.

Type of scale displayed on the control. Linear specifies a linear scale, and Log specifies a logarithmic scale.

A finite, real, double, scalar value specifying the minimum tick mark value for the arc. The minimum must be less than the value entered for the maximum.

A finite, real, double, scalar value specifying the maximum tick mark value for the arc. The maximum must be greater than the value entered for the minimum.

A finite, real, positive, integer, scalar value specifying the interval of major tick marks on the arc. When set to auto, the block automatically adjusts the tick interval based on the minimum and maximum values.

Position of the block label. When the block is connected to a signal, the label is the name of the connected signal.

Introduced in R2015a