Switch (Using Simulink)

Switch between two inputs.

Library

Nonlinear

Description

The Switch block propagates one of two inputs to its output depending on the value of a third input, called the control input. If the signal on the control (second) input is greater than or equal to the Threshold parameter, the block propagates the first input; otherwise, it propagates the third input. This figure shows the use of the block ports.

To drive the switch with a logic input (i.e., 0 or 1), set the threshold to 0.5.

Data Type Support

A Switch block accepts real- or complex-valued signals of any data type as switched inputs (inputs 1 and 3). Both switched inputs must be of the same type. The block output signal has the data type of the selected input. The data type of the threshhold input must be boolean or double.

Parameters and Dialog Box

Threshold: The value of the control (the second input) at which the switch flips to its other state. You can specify this parameter as either a scalar or a vector equal in width to the input vectors.

Characteristics

Direct Feedthrough
Yes

Sample Time
Inherited from driving block

Scalar Expansion
Yes

Dimensionalized
Yes

Zero Crossing
Yes, to detect when the switch condition occurs

Direct Feedthrough	Yes
Sample Time	Inherited from driving block
Scalar Expansion	Yes
Dimensionalized	Yes
Zero Crossing	Yes, to detect when the switch condition occurs

Sum Terminator