Manual Switch

R2026b

Switch between two inputs

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Manual Switch block

To add a block to a model, double-click the canvas and start typing the block name. Then, select the block from the list.

Libraries:
Simulink / Signal Routing

Description

The Manual Switch block is a toggle switch that selects one of its two inputs to pass through to the output. To toggle between inputs, double-click the block. You control the signal flow by setting the switch before you start the simulation or by changing the switch while the simulation is executing. The Manual Switch block retains its current state when you save the model.

To programmatically toggle the switch, set the set_param sw property to '0' or '1'. For example, to connect the second input to the output:

set_param(gcb,'sw','0')

To connect the first input to the output:

set_param(gcb,'sw','1')

Note

Double-clicking the Manual Switch block does not open the block dialog box. Instead, it toggles the input choice.

Examples

Simulating Automatic Climate Control Systems

Simulate an automatic climate control system in a car using Simulink® and Stateflow®. In the User Setpoint in Celsius block, set the desired cabin temperature. In the External Temperature in Celsius block, set the outside temperature. The Thermometer Display block shows the temperature reading from a sensor behind the driver's head, representing the temperature the driver feels.

• Open Model

Model Fault-Tolerant Fuel Control System

Combine Stateflow® and Simulink® capabilities to model hybrid systems. This type of modeling is useful for systems that have many possible operational modes based on discrete events. Simulink handles traditional signal flow while Stateflow implements changes in control configuration. This example describes a fuel control system for a gasoline engine. The system is robust because it detects individual sensor failures, and dynamically reconfigures the control system for uninterrupted operation.

• Open Model

Ports

Input

Port_1 — First input signal

scalar | vector

First of two inputs to the Manual Switch block. The block propagates the selected input to the output. To select the input signal, toggle the switch by double-clicking the block.

Data Types: single | double | half | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64 | Boolean | fixed point | enumerated | bus

Port_2 — Second input signal

scalar | vector

Second of two inputs to the Manual Switch block. The block propagates the selected input to the output. To select the input signal, toggle the switch by double-clicking the block.

Data Types: single | double | half | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64 | Boolean | fixed point | enumerated | bus

Output

Port_1 — Output signal

scalar | vector

Output signal propagated from either the first or second input signal.

Data Types: single | double | half | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64 | Boolean | fixed point | enumerated | bus

Parameters

To view the block parameters, right-click the block, and then click the Block Parameters button .

Allow the two inputs to differ in size (Results in variable-size output signal) — Allow inputs of different sizes

off (default) | on

Select this check box to allow inputs with different sizes and propagate the selected input signal size to the output signal. If you clear the box, the block expands scalar inputs to have the same dimensions as nonscalar inputs. See Scalar Expansion of Inputs and Parameters.

Programmatic Use

Parameter: varsize

Type: character vector

Value: 'on' | 'off'

Default: 'off'

Sample time (-1 for inherited) — Interval between samples

-1 (default) | scalar | vector

Specify the time interval between samples. To inherit the sample time, set this parameter to -1. For more information, see Specify Sample Time.

Dependencies

This parameter is visible only if you set it to a value other than -1. To learn more, see Blocks for Which Sample Time Is Not Recommended.

Programmatic Use

To set the block parameter value programmatically, use the set_param function.

Parameter:	SampleTime
Values:	"-1" (default) | scalar or vector in quotes

Block Characteristics

Data Types	Boolean | bus | double | enumerated | fixed point | half | integer | single | string
Direct Feedthrough	yes
Multidimensional Signals	yes
Variable-Size Signals	yes
Zero-Crossing Detection	no

Programmatic Use: Add Block

To add the block programmatically, use the add_block function with one of these library block paths as the source.

"simulink/Signal Routing/Manual Switch"

Example: add_block("simulink/Signal Routing/Manual Switch","myModel/myBlock",MakeNameUnique="on")

For information about programmatic access to individual block parameters, see the Programmatic Use section of parameter descriptions on this page.

Extended Capabilities

C/C++ Code Generation

Generate C and C++ code using Simulink® Coder™.

Not recommended for production code.

Fixed-Point Conversion
Design and simulate fixed-point systems using Fixed-Point Designer™.

Version History

Introduced before R2006a