siunitx in pgfplots label description infinite loop?

Question

Answering y-axis units tikz, I firstly come upon this solution:

\documentclass[border=10pt]{standalone}
\usepackage{tikz}
\usepackage{pgfplots}\pgfplotsset{compat=1.13}
\usepackage{siunitx}
\begin{document}
\begin{tikzpicture}[
    ]
    \begin{axis}[%
    xmin=1,
    xmax=5,
    xtick={\empty},
    ymin=4,
    ymax=6,
    axis background/.style={fill=white},
    %yticklabel={$\pgfmathprintnumber{\tick}$~V}      %% this works
    yticklabel={\SI{\pgfmathprintnumber{\tick}}{V}}   %% this hangs 
    ]
    \addplot [color=blue, forget plot]
    table[row sep=crcr]{%
        1   4.1\\
        2   4.9\\
        3   5\\
        5   5.6\\
    };
\end{axis}     
\end{tikzpicture}
\end{document}

That mean, I used \SI{}{} in the yticklabel key. Unfortunately, this seems to create an infinite loop: the compilations hangs in:

[...]
 (/usr/share/texlive/texmf-dist/tex/latex/beamer/translator/dicts/translator-bas
ic-dictionary/translator-basic-dictionary-English.dict)
(/usr/share/texlive/texmf-dist/tex/latex/siunitx/siunitx-abbreviations.cfg)

...and the only way out is interrupting it.

Is it possible to fix this or it's just an operator (me) error?

Answer 1

Use \tick directly and use the siunitx tools to round the number, e.g. \SI[round-mode = places,round-precision = 1]{\tick}{V}

\documentclass[border=10pt]{standalone}
\usepackage{tikz}
\usepackage{pgfplots}\pgfplotsset{compat=1.13}
\usepackage{siunitx}
\begin{document}
\begin{tikzpicture}[
    ]
    \begin{axis}[%
    xmin=1,
    xmax=5,
    xtick={\empty},
    ymin=4,
    ymax=6,
    axis background/.style={fill=white},
    yticklabel={\SI[round-mode = places,round-precision = 1]{\tick}{V}}   
    ]
    \addplot [color=blue, forget plot]
    table[row sep=crcr]{%
        1   4.1\\
        2   4.9\\
        3   5\\
        5   5.6\\
    };
\end{axis}     
\end{tikzpicture}
\end{document}