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Switch

Logic

The Switch block selects between two input signals based on a selector signal. If the selector is non-negative (≥ 0), it outputs the first input; otherwise, it outputs the second input. Essential for conditional signal routing and mode selection.

Mathematical Model

y = \begin{cases} u_1, & u_{\text{sel}} \ge 0 \\ u_2, & u_{\text{sel}} < 0 \end{cases}

Inputs & Outputs

Direction	ID	Label	Type	Status
→ In	`selector`	Selector	number	Required
→ In	`in1`	If ≥ 0	number	Required
→ In	`in2`	If < 0	number	Required
← Out	`out`	Output	number	Output

Parameters

Parameters	Label	Type	Default	Description
`threshold`	Threshold	number	`0`
`criteria`	Criteria	select	`u2 >= threshold`

Usage Examples

Signal Selection (1 second)

Two signals (constant 5 and ramp 0→5) selected by a step function. At t=0.5s, selector switches from negative to positive, changing output signal.

Conditional Mode Switch

Selector from comparator output (0 or 1) routes between manual (constant) and automatic (ramp) control.

Remarks & Best Practices

No Parameters: Simple threshold logic (selector ≥ 0)
Combinatorial: Zero delay, instantaneous switching
Zero Crossing: Switches exactly at selector = 0
Routing: Essential for mode selection in complex systems
Glitch-Free: No oscillation at boundary

Related Components

Comparator: Generates binary selector signal
Step: Input signal for selector
Gain: Scale selector signal
Subtraction: Compute error for switching logic