Tune parameter value with dial
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.
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.
To facilitate understanding and debugging your model, you can modify Dashboard block connections in your model during normal and accelerator mode simulations.
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.
You can hide the message shown on unconnected blocks using the
set_param
function with the ShowInitialText
block parameter.
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.
When you simulate a model hierarchy, Dashboard blocks inside referenced models do not update.
Dashboard blocks do not support rapid accelerator simulation.
Some signals are not available during accelerator mode simulations. To view such signals on a Dashboard block, mark the signal for logging.
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.
When you connect a Dashboard block to a variable or parameter during simulation, the data for that variable or parameter does not get logged to the Simulation Data Inspector. To log variable and parameter data to the Simulation Data Inspector, connect the Dashboard block to the variable or parameter prior to simulation.
When you simulate a model in external mode with the Default parameter behavior set to Inlined, Dashboard blocks can appear to change parameter and variable values. However, the change does not propagate to the simulation. For example, the Gain block displays changes made to its Gain parameter using the Dashboard blocks, but the Gain value used in the simulation does not change.
Data Types |
|
Direct Feedthrough |
|
Multidimensional Signals |
|
Variable-Size Signals |
|
Zero-Crossing Detection |
|