Switch (Simulink Reference)

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Simulink Reference
Switch

Switch output between the first input and the third input based on the value of the second input

Library

Simulink Signal Routing and Fixed-Point Blockset Select

Description

The Switch block passes through the first (top) input or the third (bottom) input based on the value of the second (middle) input. The first and third inputs are called data inputs. The second input is called the control input.

You select the conditions under which the first input is passed with the Criteria for passing first input parameter. You can make the block check whether the control input is greater than or equal to the threshold value, purely greater than the threshold value, or nonzero. If the control input meets the condition set in the Criteria for passing first input parameter, then the first input is passed. Otherwise, the third input is passed.

When the Show additional parameters check box is selected, some of the parameters that become visible are common to many blocks. For a detailed description of these parameters, refer to Block Parameters in the Fixed-Point Blockset documentation.

Data Type Support

A Switch block accepts real- or complex-valued signals of any data type except int64 and uint64 for data and control inputs. The data type of the threshold is double.

Parameters and Dialog Box

Criteria for passing first input Select the conditions under which the first input is passed. You can make the block check whether the control input is greater than or equal to the threshold value, purely greater than the threshold value, or nonzero. If the control input meets the condition set in this parameter, then the first input is passed. Otherwise, the third input is passed. Threshold Assign the switch threshold that determines which input is passed to the output. Show additional parameters If selected, additional parameters specific to implementation of the block become visible as shown.

Require all data port inputs to have same data type Select to require all data inputs to have the same data type. Output data type mode Choose to inherit the output data type and scaling by backpropagation or by an internal rule. The internal rule causes the output of the block to have the same data type and scaling as the input with the larger positive range. Round integer calculations toward Select the rounding mode for fixed-point output. Saturate on integer overflow If selected, overflows saturate. Enable zero crossing detection Select to enable zero crossing detection. For more information, see Zero Crossing Detection in the Using Simulink documentation.

Characteristics

Dimensionalized Yes
Direct Feedthrough Yes
Sample Time Inherited from driving block
Scalar Expansion Yes
Zero Crossing No, unless Enable zero crossing detection is selected

See Also

Multi-Port Switch

SumSwitch Case

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