Subtraction Block

Subtracts multiple input signals (first input minus all others)

Description

The Subtraction block performs algebraic subtraction of two input signals: output = in1 - in2. This provides an explicit and intuitive alternative to using the Sum block with a negative Gain factor. Essential for generating error signals in feedback control systems.

Mathematical Model

y(t) = u₁(t) - u₂(t)
where:
  u₁ = minuend (in1 input)
  u₂ = subtrahend (in2 input)

Parameters

(No parameters - fixed two-input subtraction)

Examples

Reference signal (5) minus measured signal (3) produces error (2).

Remarks

• Two explicit inputs: in1 (minuend) and in2 (subtrahend)
• Zero computational overhead
• Essential in feedback control: error = setpoint - measured
• More intuitive than Sum block with negative Gain
• Commonly used in PID controller error computation

See Also

• Sum: Signal addition with configurable inputs
• Gain: Signal scaling (use for negative Gain)
• Saturation: Output limiting for error bounds