Subtraction Block
Subtracts multiple input signals (first input minus all others)
Open Subtraction in BlockWerk →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) = u_1(t) - u_2(t)Parameters
(No parameters - fixed two-input subtraction)
signs
Type: text (Default: "+-")
List of signs (+|-) parameter description placeholder.
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