https://forge.codesys.com/forge/talk/Deutsch/thread/8d95159605/2020-02-28T12:38:06.807000ZRecent posts to Umrechnung Dezimal in Fliesskomma2020-02-28T12:38:06.807000Z2020-02-28T12:38:06.807000ZMichael.Klankhttps://forge.codesys.com/u/michael-klank/https://forge.codesys.com298774cceb141cbf045ac738ce9785b2cc206411

<div class="markdown_content"><p>Aus dem <a class="" href="http://www.oscat.de/community/index.php?action=profile;u=123;sa=showPosts" rel="nofollow">Oscat</a> Forum:</p> <div class="codehilite"><pre><span></span><span class="nt">IEEE32</span> <span class="nt">in</span> <span class="nt">REAL</span> <span class="nt">FUNCTION</span> <span class="nt">IEEE32_TO_REAL</span> <span class="o">:</span> <span class="nt">REAL</span> <span class="nt">VAR_INPUT</span> <span class="err"> </span> <span class="err"> </span><span class="nt">IN</span><span class="p">:</span><span class="nd">DWORD</span><span class="o">;</span> <span class="nt">END_VAR</span> <span class="nt">VAR</span> <span class="err"> </span> <span class="err"> </span><span class="nt">PTREAL</span><span class="p">:</span><span class="nd">POINTER</span> <span class="nt">TO</span> <span class="nt">REAL</span><span class="o">;</span> <span class="nt">END_VAR</span> <span class="nt">PTREAL</span><span class="o">:=</span><span class="nt">ADR</span><span class="o">(</span><span class="nt">IN</span><span class="o">);</span> <span class="nt">IEEE32_TO_REAL</span><span class="o">:=</span><span class="nt">PTREAL</span><span class="o">^;</span> <span class="nt">END_FUNCTION</span> <span class="nt">REAL</span> <span class="nt">in</span> <span class="nt">IEEE32</span> <span class="nt">FUNCTION</span> <span class="nt">REAL_TO_IEEE32</span> <span class="o">:</span> <span class="nt">DWORD</span> <span class="nt">VAR_INPUT</span> <span class="err"> </span> <span class="err"> </span><span class="nt">IN</span><span class="p">:</span><span class="nd">REAL</span><span class="o">;</span> <span class="nt">END_VAR</span> <span class="nt">VAR</span> <span class="err"> </span> <span class="err"> </span><span class="nt">PTDWORD</span><span class="p">:</span><span class="nd">POINTER</span> <span class="nt">TO</span> <span class="nt">DWORD</span><span class="o">;</span> <span class="nt">END_VAR</span> <span class="nt">PTDWORD</span><span class="o">:=</span><span class="nt">ADR</span><span class="o">(</span><span class="nt">IN</span><span class="o">);</span> <span class="nt">REAL_TO_IEEE32</span><span class="o">:=</span><span class="nt">PTDWORD</span><span class="o">^;</span> <span class="nt">END_FUNCTION</span> </pre></div> <p>Michael</p></div>

2020-02-28T12:37:59.440000Z2020-02-28T12:37:59.440000ZMichael.Klankhttps://forge.codesys.com/u/michael-klank/https://forge.codesys.com71b70a4395b84671ee491f505cb94e59ef2392b2

<div class="markdown_content"><p>Also <a class="" href="http://de.wikipedia.org/wiki/IEEE_754" rel="nofollow">damit</a></p> <p>Michael</p></div>

2020-02-28T12:37:56.387000Z2020-02-28T12:37:56.387000Zscorpionhttps://forge.codesys.com/u/scorpion/https://forge.codesys.com6aea7338895bab52367807ae9523a0451f2352d1

<div class="markdown_content"><p>Hallo zusammen</p> <p>Die Wandlung von Real (z.B. 1.02) in das <strong>IEEE 754-Format </strong>scheint ja auf diese Weise zu funtkionieren.</p> <p>Ich brauche aber <strong>die umgekehrte Funktion</strong>. </p> <p>Mein Profibus Slave liefert mir den Istwert aufgeteilt auf die 4 Bytes.</p> <p>Diese Bytes möchte ich nun in eine "normale" REAL-Zahl wandeln.</p> <p>Kann mir jemand helfen?</p></div>

2020-02-28T12:37:48.999000Z2020-02-28T12:37:48.999000ZWolfgang Dollhttps://forge.codesys.com/u/wolfgang-doll/https://forge.codesys.com5f00b8c4ed1411547995fdb6cd2147f459bdc159

<div class="markdown_content"><p>Für den Fall, dass es um die Darstellung des binären Musters im Speicher geht würde ich folgendes vorschlagen:</p> <div class="codehilite"><pre><span></span><span class="err"> </span><span class="n">VAR</span> <span class="err"> </span> <span class="err"> </span> <span class="n">sValue</span> <span class="p">:</span> <span class="n">STRING</span><span class="p">;</span> <span class="err"> </span> <span class="err"> </span> <span class="n">rValue</span> <span class="p">:</span> <span class="nb">REAL</span><span class="p">;</span> <span class="err"> </span> <span class="err"> </span> <span class="n">pValue</span> <span class="p">:</span> <span class="n">POINTER</span> <span class="k">TO</span> <span class="n">DWORD</span><span class="p">;</span> <span class="err"> </span> <span class="err"> </span> <span class="n">dwValue</span> <span class="p">:</span> <span class="n">DWORD</span><span class="p">;</span> <span class="err"> </span><span class="n">END_VAR</span> <span class="n">sValue</span> <span class="p">:</span><span class="o">=</span> <span class="ss">"1.02"</span><span class="p">;</span> <span class="n">rValue</span> <span class="p">:</span><span class="o">=</span> <span class="n">STRING_TO_REAL</span><span class="p">(</span><span class="n">sValue</span><span class="p">);</span> <span class="n">pValue</span> <span class="p">:</span><span class="o">=</span> <span class="n">ADR</span><span class="p">(</span><span class="n">rValue</span><span class="p">);</span> <span class="n">dwValue</span> <span class="p">:</span><span class="o">=</span> <span class="n">pValue</span><span class="o">^</span><span class="p">;</span> </pre></div> <p>In dwValue steht die Zahl "1.02" als Bitmuster im IEEE Format.</p> <p>In diesem Fall also : 16#3F828F5C</p> <p>Gruß</p> <p>Wolfgang Doll</p></div>

2020-02-28T12:37:46.286000Z2020-02-28T12:37:46.286000ZAnonymoushttps://forge.codesys.com/u/*anonymous/https://forge.codesys.comdb2a12331b4e623ce85335d04e9a5e4c93eb0bf5

<div class="markdown_content"><p><em>Originally created by:</em> Gast</p> <p>Die Konverierungsfunktionen STRING_TO_REAL bzw. STRING_TO_LREAL leisten das gewünschte. Das Zielformat ist das Gleitkommaformat der jeweiligen CPU. Das ist bis auf wenige Ausnahmen (8051, manche c16x Plattformen) IEE-konform.</p> <p>Gruß</p> <p>Dieter Hess</p></div>

2020-02-28T12:37:38.804000Z2020-02-28T12:37:38.804000ZMatzehttps://forge.codesys.com/u/matze/https://forge.codesys.com111effa972e0beda68748806e7f60c28505fc970

<div class="markdown_content"><p>Hi</p> <p>Ich hab da mal eine Frage. Gibt es bei Codesys einen Baustein , der mir eine Dezimaldarstellung von Zahlen (z.B. "1.02") in eine von modernen CPUs verwendeten IEEE 754-Fließkommazahldarstellung umwandelt ?</p> <p>Danke für die Hilfe.</p></div>