\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{tikz}
\title{Derevyannykh.2.7}
\author{devmishok }
\date{July 2018}

\begin{document}

\maketitle

\section{Task7}

\begin{tikzpicture}[
node distance=1.5cm,
squarenode/.style={rectangle, draw=black!60, fill=green!150, thick, minimum width=5mm, minimum height=10mm},
roundnode/.style={circle, draw=black!60, fill=white!5, thick, minimum size=3mm}
]
\node[squarenode, label=above:T1] (T1);
\node[roundnode, label=below:p1] (P1) [right of=T1];
\node[squarenode, label=above:T2] (T2) [right of=P1];
\node[roundnode, label=below:p2] (P2) [right of=T2];
\node[squarenode, label=above:T3] (T3) [right of=P2];
\node[roundnode, label=below:cp2] (CP2) [below of=P2];
\node[roundnode,label=below:cp1] (CP1) [below of=P1];

\draw[->, thick] (T1.east) -- (P1.west);
\draw[->, thick] (P1.east) -- (T2.west);
\draw[->, thick] (T2.east) -- (P2.west);
\draw[->, thick] (P2.east) -- (T3.west);
\draw[->] (T3.south) -- (CP2.east);
\draw[->] (CP2.west) -- (T2.south);
\draw[->] (T2.south) -- (CP1.east);
\draw[->] (CP1.west) -- (T1.south);

\end{tikzpicture}




\end{document}