Feedback

Computes the difference between a reference input and a feedback input.

This block calculates the error signal in a feedback control system by subtracting the feedback input (u2) from the reference input (u1). The component is typically used at the beginning of a control system to determine the difference between a desired setpoint and the measured output being fed back.

This component extends from SI2SO

Usage

Feedback()

Connectors

• u1 - This connector represents a real signal as an input to a component (RealInput)

• u2 - This connector represents a real signal as an input to a component (RealInput)

• y - This connector represents a real signal as an output from a component (RealOutput)

Behavior

$$\begin{array}{rl}y\left(t\right)& =\mathtt{u}\mathtt{1}\left(t\right)-\mathtt{u}\mathtt{2}\left(t\right)\end{array}$$

Source

# Computes the difference between a reference input and a feedback input.
#
# This block calculates the error signal in a feedback control system by subtracting the feedback
# input (`u2`) from the reference input (`u1`). The component is typically used at the beginning of a
# control system to determine the difference between a desired setpoint and the measured output
# being fed back.
component Feedback
  extends SI2SO
relations
  # Calculates output as the difference between the reference input and feedback input
  y = u1-u2
metadata {"Dyad": {"icons": {"default": "dyad://BlockComponents/Feedback.svg"}}}
end

Flattened Source

# Computes the difference between a reference input and a feedback input.
#
# This block calculates the error signal in a feedback control system by subtracting the feedback
# input (`u2`) from the reference input (`u1`). The component is typically used at the beginning of a
# control system to determine the difference between a desired setpoint and the measured output
# being fed back.
component Feedback
  # First real-valued input signal
  u1 = RealInput() [{"Dyad": {"placement": {"icon": {"x1": -50, "y1": 150, "x2": 50, "y2": 250}}}}]
  # Second real-valued input signal
  u2 = RealInput() [{"Dyad": {"placement": {"icon": {"x1": -50, "y1": 750, "x2": 50, "y2": 850}}}}]
  # Real-valued output signal
  y = RealOutput() [{"Dyad": {"placement": {"icon": {"x1": 950, "y1": 450, "x2": 1050, "y2": 550}}}}]
relations
  # Calculates output as the difference between the reference input and feedback input
  y = u1-u2
metadata {"Dyad": {"icons": {"default": "dyad://BlockComponents/Feedback.svg"}}}
end

Test Cases

This is setup code, that must be run before each test case.

using BlockComponents
using ModelingToolkit, OrdinaryDiffEqDefault
using Plots
using CSV, DataFrames

snapshotsdir = joinpath(dirname(dirname(pathof(BlockComponents))), "test", "snapshots")

"/home/actions-runner-10/.julia/packages/BlockComponents/77kIK/test/snapshots"

Related

• Examples

• Experiments

• Analyses

• Tests

  • FeedbackTest