Switch Block

Selects between two input signals based on a selector (threshold=0)

Description

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

output = { in1,  if selector ≥ 0
         { in2,  if selector < 0

Parameters

(No parameters)

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

• 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

See Also

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