将最小-最大添加到控制系统块

Question

是否可以在控制系统块中添加最小-最大限制例如：控制系统原理? pin edge 能做到这一点吗？

Answer 1

是的，您可以使用 s 来完成这项工作pin。

\documentclass{article}

\usepackage{tikz}
\usetikzlibrary{shapes,arrows.meta,decorations}
\pgfdeclaredecoration{strange pin}{initial}
{
\state{initial}[width=0pt,next state=final] {
    \pgfpathlineto{\pgfpointadd{\pgfpointdecoratedpathlast}{\pgfpoint{0pt}{-2pt}}}
  }
  \state{final}
  {
    \pgfpathlineto{\pgfpointadd{\pgfpointdecoratedpathlast}{\pgfpoint{0pt}{-12pt}}}
  }
}

\begin{document}


\tikzset{block/.style={draw, fill=blue!20, rectangle, 
    minimum height=3em, minimum width=6em},
sum/.style={draw, fill=blue!20, circle, node distance=1cm},
input/.style={coordinate},
output/.style={coordinate},
custom pin/.style={pin edge={solid,semithick,black,decorate,decoration={strange pin}}}}

% The block diagram code is probably more verbose than necessary
\begin{tikzpicture}[auto, node distance=2cm,>=Latex]
    % We start by placing the blocks
    \node [input, name=input] {};
    \node [sum, right of=input] (sum) {};
    \node [block, right of=sum] (controller) {Controller};
    \node [block, right of=controller, pin={[custom pin]above:Disturbances},
            node distance=3cm] (system) {System};
    % We draw an edge between the controller and system block to 
    % calculate the coordinate u. We need it to place the measurement block. 
    \draw [->] (controller) -- node[name=u] {$u$} (system);
    \node [output, right of=system] (output) {};
    \node [block, below of=u, pin={[custom pin]below:duck}] (measurements) {Measurements};

    % Once the nodes are placed, connecting them is easy. 
    \draw [draw,->] (input) -- node {$r$} (sum);
    \draw [->] (sum) -- node {$e$} (controller);
    \draw [->] (system) -- node [name=y] {$y$}(output);
    \draw [->] (y) |- (measurements);
    \draw [->] (measurements) -| node[pos=0.99] {$-$} 
        node [near end] {$y_m$} (sum);
\end{tikzpicture}

\end{document}