von Xenara » Do 4. Nov 2010, 11:20
			
			
			Dein Beispiel funktioniert bei mir einwandfrei, es erscheint einfach "," zwischen den Zahlen.
In deinem Code habe ich trotzdem ein paar Sachen angemerkt:
%BRAUCHTS NICHT %\NeedsTeXFormat{LaTeX2e}[1995/06/01] 
\documentclass[ 
    BCOR12mm, 
    DIV18, 
    headsepline, 
    oneside, 
    idxtotoc, 
    bibtotoc, 
    liststotoc, 
    openany, 
    pointlessnumbers, 
    12pt 
    ] 
    {scrbook} 
\usepackage[ngerman]{babel} 
\usepackage[T1]{fontenc} 
\usepackage[latin1]{inputenc} 
\usepackage[babel,german=quotes]{csquotes} 
\usepackage{lmodern} 
\usepackage{float} 
\restylefloat{figure}                %für \begin{figure}[H] 
\usepackage{setspace} 
\usepackage{mathcomp} 
%WEGLASSEN! %\usepackage{ae}                          % Für PDF-Erstellung 
\usepackage[hang]{caption}              % mehrzeilige Captions ausrichten 
\usepackage[final]{graphicx}             % Bilder einbinden 
\usepackage{verbatim}                    % Für Quelltexte u.ä. 
\usepackage{cite}                        % Zitate [1,3,5,7,6] zu [1,2,5-7] zusammengefassen 
\usepackage{marvosym}                    % zur Darstellung des Eurosymbols \EUR 
\usepackage{makeidx}                     % für Erstellung der Indexdatei 
\usepackage{ifthen} 
\usepackage{miller}                      % zum Schreiben von Millerschen Indizees 
\usepackage{numprint}                    % zum Formatieren von Zahlen und Zahl und Einheit 
\usepackage{hhline}                      % erweiterte Möglichkeiten der Liniendarstellung 
\addto\extrasgerman{\sisetup{locale = DE}} 
\usepackage{siunitx}%für SI-Einheiten 
\sisetup{ 
per=frac 
,repeatunits = false 
,trapambigrange=false 
, tophrase = - 
,loctolang=DE:ngerman 
%,output-decimal-marker=comma 
,decimalsymbol=comma 
} 
\usepackage{amsmath} 
\usepackage{subfig} %Bilder nebeneinander 
\usepackage{hyperref}% MUSS IN 90% DER FÄLLE ALS ALLERLETZES PAKET GELADEN WERDEN       % URL verlinken, bzw. für Formatierung URL Adresse im Literaturverzeichnis 
\renewcommand{\sectionmark}[1]{\markright{\thesection\enskip #1}} 
\begin{document} 
\SI{0,57}{N \per\mm\squared} 
\end{document} 
Vielleicht liegt es an veralteten Paketen? Stell ein \listfiles noch vor \documentclass{...}, dann werden im .log-file die verwendeten Pakete und Versionen aufgelistet.
Bei mir sieht das mit dem Code oben so aus:
 *File List*
 scrbook.cls    2009/07/24 v3.04a KOMA-Script document class (book)
scrkbase.sty    2009/07/24 v3.04a KOMA-Script package (KOMA-Script-dependent ba
sics and keyval usage)
 scrbase.sty    2009/07/24 v3.04a KOMA-Script package (KOMA-Script-independent 
basics and keyval usage)
  keyval.sty    1999/03/16 v1.13 key=value parser (DPC)
scrlfile.sty    2009/03/25 v3.03 KOMA-Script package (loading files)
tocbasic.sty    2009/06/08 v3.03b KOMA-Script package (handling toc-files)
scrsize12pt.clo    2009/07/24 v3.04a KOMA-Script font size class option (12pt)
typearea.sty    2009/07/24 v3.04a KOMA-Script package (type area)
   babel.sty    2008/07/06 v3.8l The Babel package
ngermanb.ldf    2008/07/06 v2.6n new German support from the babel system
 fontenc.sty
   t1enc.def    2005/09/27 v1.99g Standard LaTeX file
inputenc.sty    2008/03/30 v1.1d Input encoding file
  latin1.def    2008/03/30 v1.1d Input encoding file
csquotes.sty    2009/09/23 v4.4c context-sensitive quotations
etoolbox.sty    2009/08/06 v1.8 e-TeX tools for LaTeX
    etex.sty    1998/03/26 v2.0 eTeX basic definition package (PEB)
csquotes.def    2009/09/23 v4.4c csquotes generic definitions
csquotes.cfg    2009/05/30 v4.4 csquotes configuration
 lmodern.sty    2009/10/30 v1.6 Latin Modern Fonts
   float.sty    2001/11/08 v1.3d Float enhancements (AL)
setspace.sty    2000/12/01 6.7 Contributed and Supported LaTeX2e package
mathcomp.sty    2001/01/07 v0.1f (TBo)
textcomp.sty    2005/09/27 v1.99g Standard LaTeX package
  ts1enc.def    2001/06/05 v3.0e (jk/car/fm) Standard LaTeX file
 caption.sty    2009/10/09 v3.1k Customizing captions (AR)
caption3.sty    2009/10/09 v3.1k caption3 kernel (AR)
graphicx.sty    1999/02/16 v1.0f Enhanced LaTeX Graphics (DPC,SPQR)
graphics.sty    2009/02/05 v1.0o Standard LaTeX Graphics (DPC,SPQR)
    trig.sty    1999/03/16 v1.09 sin cos tan (DPC)
graphics.cfg    2009/08/28 v1.8 graphics configuration of TeX Live
  pdftex.def    2009/08/25 v0.04m Graphics/color for pdfTeX
verbatim.sty    2003/08/22 v1.5q LaTeX2e package for verbatim enhancements
    cite.sty    2009/08/29  v 5.2
marvosym.sty    2006/05/11 v2.1 Martin Vogel's Symbols font definitions
 makeidx.sty    2000/03/29 v1.0m Standard LaTeX package
  ifthen.sty    2001/05/26 v1.1c Standard LaTeX ifthen package (DPC)
  miller.sty    2004/09/20 v1.2 print miller indices
numprint.sty    2008/02/17 v1.38 Print numbers (HH)
   array.sty    2008/09/09 v2.4c Tabular extension package (FMi)
  hhline.sty    1994/05/23 v2.03 Table rule package (DPC)
 siunitx.sty    2009/09/21 v1.3a A comprehensive (SI) units package
 xkeyval.sty    2008/08/13 v2.6a package option processing (HA)
 xkeyval.tex    2008/08/13 v2.6a key=value parser (HA)
 amstext.sty    2000/06/29 v2.01
  amsgen.sty    1999/11/30 v2.0
  xspace.sty    2006/05/08 v1.12 Space after command names (DPC,MH)
si-prefix.cfg    2009/09/21 v1.3a siunitx: SI Multiple prefixes
si-named.cfg    2009/09/21 v1.3a siunitx: SI Named units
 si-addn.cfg    2009/09/21 v1.3a siunitx: SI Additional units
si-prefixed.cfg    2009/09/21 v1.3a siunitx: SI Prefixed units
si-accepted.cfg    2009/09/21 v1.3a siunitx: SI Accepted units
si-physical.cfg    2009/09/21 v1.3a siunitx: SI Physically-measured units
 si-abbr.cfg    2009/09/21 v1.3a siunitx: Abbreviated units
   si-DE.cfg    2009/09/21 v1.3a siunitx: Germany locale
 amsmath.sty    2000/07/18 v2.13 AMS math features
  amsbsy.sty    1999/11/29 v1.2d
  amsopn.sty    1999/12/14 v2.01 operator names
  subfig.sty    2005/06/28 ver: 1.3 subfig package
hyperref.sty    2009/10/09 v6.79a Hypertext links for LaTeX
   ifpdf.sty    2009/04/10 v2.0 Provides the ifpdf switch (HO)
  ifvtex.sty    2008/11/04 v1.4 Switches for detecting VTeX and its modes (HO)
 ifxetex.sty    2009/01/23 v0.5 Provides ifxetex conditional
 hycolor.sty    2009/10/02 v1.5 Code for color options of hyperref/bookmark (HO
)
xcolor-patch.sty    2009/10/02 xcolor patch
  pd1enc.def    2009/10/09 v6.79a Hyperref: PDFDocEncoding definition (HO)
etexcmds.sty    2007/12/12 v1.2 Prefix for e-TeX command names (HO)
infwarerr.sty    2007/09/09 v1.2 Providing info/warning/message (HO)
hyperref.cfg    2002/06/06 v1.2 hyperref configuration of TeXLive
kvoptions.sty    2009/08/13 v3.4 Keyval support for LaTeX options (HO)
kvsetkeys.sty    2009/07/30 v1.5 Key value parser with default handler support 
(HO)
     url.sty    2006/04/12  ver 3.3  Verb mode for urls, etc.
  bitset.sty    2007/09/28 v1.0 Data type bit set (HO)
 intcalc.sty    2007/09/27 v1.1 Expandable integer calculations (HO)
bigintcalc.sty    2007/11/11 v1.1 Expandable big integer calculations (HO)
pdftexcmds.sty    2009/09/23 v0.6 LuaTeX support for pdfTeX utility functions (
HO)
ifluatex.sty    2009/04/17 v1.2 Provides the ifluatex switch (HO)
 ltxcmds.sty    2009/08/05 v1.0 Some LaTeX kernel commands for general use (HO)
atbegshi.sty    2008/07/31 v1.9 At begin shipout hook (HO)
 hpdftex.def    2009/10/09 v6.79a Hyperref driver for pdfTeX
  ts1cmr.fd    1999/05/25 v2.5h Standard LaTeX font definitions
   t1lmr.fd    2009/10/30 v1.6 Font defs for Latin Modern
supp-pdf.mkii
 nameref.sty    2007/05/29 v2.31 Cross-referencing by name of section
refcount.sty    2008/08/11 v3.1 Data extraction from references (HO)
  Test-3.out
  Test-3.out
  ot1lmr.fd    2009/10/30 v1.6 Font defs for Latin Modern
  omllmm.fd    2009/10/30 v1.6 Font defs for Latin Modern
 omslmsy.fd    2009/10/30 v1.6 Font defs for Latin Modern
 omxlmex.fd    2009/10/30 v1.6 Font defs for Latin Modern
 ot1lmss.fd    2009/10/30 v1.6 Font defs for Latin Modern
 ot1lmtt.fd    2009/10/30 v1.6 Font defs for Latin Modern
 ***********
Mach das mal bei dir und vergleiche die Versionen. Es sind übrigens so viele Pakete, weil du kein wirklich minimales Beispiel gemacht hast.
Dein Beispiel funktioniert bei mir einwandfrei, es erscheint einfach "," zwischen den Zahlen.
In deinem Code habe ich trotzdem ein paar Sachen angemerkt:
[code]
%BRAUCHTS NICHT %\NeedsTeXFormat{LaTeX2e}[1995/06/01] 
\documentclass[ 
    BCOR12mm, 
    DIV18, 
    headsepline, 
    oneside, 
    idxtotoc, 
    bibtotoc, 
    liststotoc, 
    openany, 
    pointlessnumbers, 
    12pt 
    ] 
    {scrbook} 
\usepackage[ngerman]{babel} 
\usepackage[T1]{fontenc} 
\usepackage[latin1]{inputenc} 
\usepackage[babel,german=quotes]{csquotes} 
\usepackage{lmodern} 
\usepackage{float} 
\restylefloat{figure}                %für \begin{figure}[H] 
\usepackage{setspace} 
\usepackage{mathcomp} 
%WEGLASSEN! %\usepackage{ae}                          % Für PDF-Erstellung 
\usepackage[hang]{caption}              % mehrzeilige Captions ausrichten 
\usepackage[final]{graphicx}             % Bilder einbinden 
\usepackage{verbatim}                    % Für Quelltexte u.ä. 
\usepackage{cite}                        % Zitate [1,3,5,7,6] zu [1,2,5-7] zusammengefassen 
\usepackage{marvosym}                    % zur Darstellung des Eurosymbols \EUR 
\usepackage{makeidx}                     % für Erstellung der Indexdatei 
\usepackage{ifthen} 
\usepackage{miller}                      % zum Schreiben von Millerschen Indizees 
\usepackage{numprint}                    % zum Formatieren von Zahlen und Zahl und Einheit 
\usepackage{hhline}                      % erweiterte Möglichkeiten der Liniendarstellung 
\addto\extrasgerman{\sisetup{locale = DE}} 
\usepackage{siunitx}%für SI-Einheiten 
\sisetup{ 
per=frac 
,repeatunits = false 
,trapambigrange=false 
, tophrase = - 
,loctolang=DE:ngerman 
%,output-decimal-marker=comma 
,decimalsymbol=comma 
} 
\usepackage{amsmath} 
\usepackage{subfig} %Bilder nebeneinander 
\usepackage{hyperref}% MUSS IN 90% DER FÄLLE ALS ALLERLETZES PAKET GELADEN WERDEN       % URL verlinken, bzw. für Formatierung URL Adresse im Literaturverzeichnis 
\renewcommand{\sectionmark}[1]{\markright{\thesection\enskip #1}} 
\begin{document} 
\SI{0,57}{N \per\mm\squared} 
\end{document} 
[/code]
Vielleicht liegt es an veralteten Paketen? Stell ein \listfiles noch vor \documentclass{...}, dann werden im .log-file die verwendeten Pakete und Versionen aufgelistet.
Bei mir sieht das mit dem Code oben so aus:
[code]
 *File List*
 scrbook.cls    2009/07/24 v3.04a KOMA-Script document class (book)
scrkbase.sty    2009/07/24 v3.04a KOMA-Script package (KOMA-Script-dependent ba
sics and keyval usage)
 scrbase.sty    2009/07/24 v3.04a KOMA-Script package (KOMA-Script-independent 
basics and keyval usage)
  keyval.sty    1999/03/16 v1.13 key=value parser (DPC)
scrlfile.sty    2009/03/25 v3.03 KOMA-Script package (loading files)
tocbasic.sty    2009/06/08 v3.03b KOMA-Script package (handling toc-files)
scrsize12pt.clo    2009/07/24 v3.04a KOMA-Script font size class option (12pt)
typearea.sty    2009/07/24 v3.04a KOMA-Script package (type area)
   babel.sty    2008/07/06 v3.8l The Babel package
ngermanb.ldf    2008/07/06 v2.6n new German support from the babel system
 fontenc.sty
   t1enc.def    2005/09/27 v1.99g Standard LaTeX file
inputenc.sty    2008/03/30 v1.1d Input encoding file
  latin1.def    2008/03/30 v1.1d Input encoding file
csquotes.sty    2009/09/23 v4.4c context-sensitive quotations
etoolbox.sty    2009/08/06 v1.8 e-TeX tools for LaTeX
    etex.sty    1998/03/26 v2.0 eTeX basic definition package (PEB)
csquotes.def    2009/09/23 v4.4c csquotes generic definitions
csquotes.cfg    2009/05/30 v4.4 csquotes configuration
 lmodern.sty    2009/10/30 v1.6 Latin Modern Fonts
   float.sty    2001/11/08 v1.3d Float enhancements (AL)
setspace.sty    2000/12/01 6.7 Contributed and Supported LaTeX2e package
mathcomp.sty    2001/01/07 v0.1f (TBo)
textcomp.sty    2005/09/27 v1.99g Standard LaTeX package
  ts1enc.def    2001/06/05 v3.0e (jk/car/fm) Standard LaTeX file
 caption.sty    2009/10/09 v3.1k Customizing captions (AR)
caption3.sty    2009/10/09 v3.1k caption3 kernel (AR)
graphicx.sty    1999/02/16 v1.0f Enhanced LaTeX Graphics (DPC,SPQR)
graphics.sty    2009/02/05 v1.0o Standard LaTeX Graphics (DPC,SPQR)
    trig.sty    1999/03/16 v1.09 sin cos tan (DPC)
graphics.cfg    2009/08/28 v1.8 graphics configuration of TeX Live
  pdftex.def    2009/08/25 v0.04m Graphics/color for pdfTeX
verbatim.sty    2003/08/22 v1.5q LaTeX2e package for verbatim enhancements
    cite.sty    2009/08/29  v 5.2
marvosym.sty    2006/05/11 v2.1 Martin Vogel's Symbols font definitions
 makeidx.sty    2000/03/29 v1.0m Standard LaTeX package
  ifthen.sty    2001/05/26 v1.1c Standard LaTeX ifthen package (DPC)
  miller.sty    2004/09/20 v1.2 print miller indices
numprint.sty    2008/02/17 v1.38 Print numbers (HH)
   array.sty    2008/09/09 v2.4c Tabular extension package (FMi)
  hhline.sty    1994/05/23 v2.03 Table rule package (DPC)
 siunitx.sty    2009/09/21 v1.3a A comprehensive (SI) units package
 xkeyval.sty    2008/08/13 v2.6a package option processing (HA)
 xkeyval.tex    2008/08/13 v2.6a key=value parser (HA)
 amstext.sty    2000/06/29 v2.01
  amsgen.sty    1999/11/30 v2.0
  xspace.sty    2006/05/08 v1.12 Space after command names (DPC,MH)
si-prefix.cfg    2009/09/21 v1.3a siunitx: SI Multiple prefixes
si-named.cfg    2009/09/21 v1.3a siunitx: SI Named units
 si-addn.cfg    2009/09/21 v1.3a siunitx: SI Additional units
si-prefixed.cfg    2009/09/21 v1.3a siunitx: SI Prefixed units
si-accepted.cfg    2009/09/21 v1.3a siunitx: SI Accepted units
si-physical.cfg    2009/09/21 v1.3a siunitx: SI Physically-measured units
 si-abbr.cfg    2009/09/21 v1.3a siunitx: Abbreviated units
   si-DE.cfg    2009/09/21 v1.3a siunitx: Germany locale
 amsmath.sty    2000/07/18 v2.13 AMS math features
  amsbsy.sty    1999/11/29 v1.2d
  amsopn.sty    1999/12/14 v2.01 operator names
  subfig.sty    2005/06/28 ver: 1.3 subfig package
hyperref.sty    2009/10/09 v6.79a Hypertext links for LaTeX
   ifpdf.sty    2009/04/10 v2.0 Provides the ifpdf switch (HO)
  ifvtex.sty    2008/11/04 v1.4 Switches for detecting VTeX and its modes (HO)
 ifxetex.sty    2009/01/23 v0.5 Provides ifxetex conditional
 hycolor.sty    2009/10/02 v1.5 Code for color options of hyperref/bookmark (HO
)
xcolor-patch.sty    2009/10/02 xcolor patch
  pd1enc.def    2009/10/09 v6.79a Hyperref: PDFDocEncoding definition (HO)
etexcmds.sty    2007/12/12 v1.2 Prefix for e-TeX command names (HO)
infwarerr.sty    2007/09/09 v1.2 Providing info/warning/message (HO)
hyperref.cfg    2002/06/06 v1.2 hyperref configuration of TeXLive
kvoptions.sty    2009/08/13 v3.4 Keyval support for LaTeX options (HO)
kvsetkeys.sty    2009/07/30 v1.5 Key value parser with default handler support 
(HO)
     url.sty    2006/04/12  ver 3.3  Verb mode for urls, etc.
  bitset.sty    2007/09/28 v1.0 Data type bit set (HO)
 intcalc.sty    2007/09/27 v1.1 Expandable integer calculations (HO)
bigintcalc.sty    2007/11/11 v1.1 Expandable big integer calculations (HO)
pdftexcmds.sty    2009/09/23 v0.6 LuaTeX support for pdfTeX utility functions (
HO)
ifluatex.sty    2009/04/17 v1.2 Provides the ifluatex switch (HO)
 ltxcmds.sty    2009/08/05 v1.0 Some LaTeX kernel commands for general use (HO)
atbegshi.sty    2008/07/31 v1.9 At begin shipout hook (HO)
 hpdftex.def    2009/10/09 v6.79a Hyperref driver for pdfTeX
  ts1cmr.fd    1999/05/25 v2.5h Standard LaTeX font definitions
   t1lmr.fd    2009/10/30 v1.6 Font defs for Latin Modern
supp-pdf.mkii
 nameref.sty    2007/05/29 v2.31 Cross-referencing by name of section
refcount.sty    2008/08/11 v3.1 Data extraction from references (HO)
  Test-3.out
  Test-3.out
  ot1lmr.fd    2009/10/30 v1.6 Font defs for Latin Modern
  omllmm.fd    2009/10/30 v1.6 Font defs for Latin Modern
 omslmsy.fd    2009/10/30 v1.6 Font defs for Latin Modern
 omxlmex.fd    2009/10/30 v1.6 Font defs for Latin Modern
 ot1lmss.fd    2009/10/30 v1.6 Font defs for Latin Modern
 ot1lmtt.fd    2009/10/30 v1.6 Font defs for Latin Modern
 ***********
[/code]
Mach das mal bei dir und vergleiche die Versionen. Es sind übrigens so viele Pakete, weil du kein wirklich minimales Beispiel gemacht hast.