Switch Function
Owning Palette: Nonlinear Systems Functions
Installed With: Control Design and Simulation Module
Switches the value of the output between value above threshold and value below threshold based on the value of the control input.
| Dialog Box Options |
| Block Diagram Inputs |
| Block Diagram Outputs |
 Place on the block diagram |
Find on the Functions palette |
Dialog Box Options
| Parameter | Description |
|---|---|
| Polymorphic instance | Specifies whether this function is Scalar or Vector. The default value is Scalar. |
| Parameters | Lists all the parameters associated with this function. Select a parameter from this list to configure the parameter. When you select a parameter, the parameter and its associated Parameter source control appear in the Parameter Information section of the configuration dialog box. |
| Preview | Displays a graphical preview, if available, of the function output or configuration. |
| Parameter Information | Contains the parameters you can configure for this function. You must select a parameter from the Parameters list to make that parameter and its associated Parameter source control visible in the Parameter Information section of the configuration dialog box. |
| Parameter source | Specifies whether you configure this parameter using the Configuration Dialog Box or a Terminal on the simulation diagram. The default value is Configuration Dialog Box. If you select Terminal, LabVIEW displays an input for that parameter on the simulation diagram, and you can wire values to that input to configure this function programmatically. If you select Configuration Dialog Box, LabVIEW removes that input from the simulation diagram. You then must set the value for this parameter inside the configuration dialog box. |
| threshold | Specifies the point at which the output switches between value above threshold and value below threshold. The LabVIEW Control Design and Simulation Module compares the value of the control input to the value of the threshold to determine the value of the output. The default value of threshold is 1. |
Block Diagram Inputs
| Parameter | Description |
|---|---|
| threshold | Specifies the point at which the output switches between value above threshold and value below threshold. The LabVIEW Control Design and Simulation Module compares the value of the control input to the value of the threshold to determine the value of the output. The default value of threshold is 1. |
| value above threshold | Specifies the signal that this function returns when the value of the control input is greater than the threshold. |
| control input | Specifies the signal that this function compares against threshold to determine which input to select as the output. |
| value below threshold | Specifies the signal that this function returns when the value of the control input is less than or equal to the threshold. |
Block Diagram Outputs
| Parameter | Description |
|---|---|
| output | Returns the signal that results from applying the function to the input signal. |
Switch Details
The following equations define the output of this function.
where y is the output.
Feedthrough Behavior
All input/output pairs of this function have direct feedthrough behavior.
Example
Refer to the SimEx switch VI in the labview\examples\Control and Simulation\Simulation\Nonlinear directory for an example of using the Switch VI.
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