Principle of separated control and safety systems

Adapted from the figure in the book by Gruhn and Cheddie (2006).

Edit and compile if you like:

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% Principle of separated control and safety systems.
% Author: Erno Pentzin (2013)
\documentclass{article}
\usepackage{tikz} 
\usepackage[active,tightpage]{preview}
\PreviewEnvironment{tikzpicture}
\setlength\PreviewBorder{10pt}%
\usetikzlibrary{decorations.markings}
\begin{document}
\begin{tikzpicture}[
    decoration={
        markings,
        mark=at position 1cm with {\arrow[black]{stealth}},
    },
    path/.style={
        ->,
        >=stealth,
        postaction=decorate
    },
    every node/.style={font=\sffamily}
]
% Boxes
\node [
    draw,
    yshift=2cm,
    minimum width=4cm,
] (control) {Control System};
\node [
    draw,
    minimum width=5cm,
    minimum height=1cm,
] (process) {Process/Equipment};
\node [
    draw,
    yshift=-2cm,
    minimum width=4cm,
] (safety) {Safety System};
% Connecting Arrows
 
 
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