https://forge.codesys.com/forge/talk/Deutsch/thread/8b9c1b1ded/2020-02-28T21:25:49.495000ZRecent posts to Variablen über den Modbus mit OPC ansprechen2020-02-28T21:25:49.495000Z2020-02-28T21:25:49.495000ZRolf-Geislerhttps://forge.codesys.com/u/rolf-geisler/https://forge.codesys.comcee510f34af64211d66d14c349103e7d8e4868e5

<div class="markdown_content"><p>OPC funktionert etwas anders. Es ist eine spezielle Anwendung der Microsoft-OLE-Technologie. Man braucht einen OPC-Server (gibt's beim SPS-Hersteller) und einen OPC-Client, z.B. als Teil der Visualisierung.</p> <p>Die Variablen, welche per OPC von der SPS gelesen oder dorthin geschrieben werden sollen, müssen dem Server bekannt gegeben werden. Im SPS-Projekt geschieht dies über Projekt ==&gt; Optionen in der Kategorie Symbolkonfiguration. Dort legt man fest, was alles in die "Symboldatei" eingetragen werden soll.</p> <p>Die absolute Adresse dieser Variablen spielt absolut keine Rolle; der OPC-Server findet sie auch dann, wenn sie nach Softwareänderungen an einer völlig anderen Stelle liegen.</p> <p>Über welche Physik der OPC-Server mit der SPS kommuniziert, ist bei diesem Modell völlig egal. Man gibt den Zugriffsweg auf die SPS nur einmalig bei der Konfiguration des OPC-Servers an.</p></div>

2020-02-28T21:25:46.326000Z2020-02-28T21:25:46.326000ZOberchefehttps://forge.codesys.com/u/oberchefe/https://forge.codesys.comb2e5069cbb1d9a0979ba20dc226255553f9aadb2

<div class="markdown_content"><p>aus dem Handbuch:</p> <div class="codehilite"><pre><span></span><span class="n">F</span><span class="err">ü</span><span class="n">r</span> <span class="n">das</span> <span class="n">Prozessabbild</span> <span class="n">der</span> <span class="n">physikalischen</span> <span class="n">Ein</span><span class="o">-</span> <span class="n">und</span> <span class="n">Ausgangsdaten</span> <span class="n">steht</span> <span class="k">in</span> <span class="n">dem</span> <span class="n">Controller</span> <span class="n">zun</span><span class="err">ä</span><span class="n">chst</span> <span class="n">jeweils</span> <span class="n">ein</span> <span class="n">Speicherbereich</span> <span class="n">von</span> <span class="mi">256</span> <span class="n">Worten</span> <span class="p">(</span><span class="n">Wort</span> <span class="mi">0</span> <span class="p">...</span> <span class="mi">255</span><span class="p">)</span> <span class="n">zur</span> <span class="n">Verf</span><span class="err">ü</span><span class="n">gung</span><span class="p">.</span> <span class="n">F</span><span class="err">ü</span><span class="n">r</span> <span class="n">die</span> <span class="n">Abbildung</span> <span class="n">der</span> <span class="n">MODBUS</span> <span class="n">PFC</span><span class="o">-</span><span class="n">Variablen</span> <span class="n">ist</span> <span class="n">der</span> <span class="n">Speicherbereich</span> <span class="n">von</span> <span class="n">jeweils</span> <span class="n">Wort</span> <span class="mi">256</span> <span class="p">...</span> <span class="mi">511</span> <span class="n">reserviert</span><span class="p">,</span> <span class="n">so</span> <span class="n">dass</span> <span class="n">die</span> <span class="n">MODBUS</span> <span class="n">PFC</span><span class="o">-</span><span class="n">Variablen</span> <span class="n">hinter</span> <span class="n">das</span> <span class="n">Prozessabbild</span> <span class="n">der</span> <span class="n">Busklemmendaten</span> <span class="n">gemappt</span> <span class="n">wird</span><span class="p">.</span> <span class="n">Ist</span> <span class="n">die</span> <span class="n">Anzahl</span> <span class="n">der</span> <span class="n">Klemmendaten</span> <span class="n">gr</span><span class="err">öß</span><span class="n">er</span> <span class="n">als</span> <span class="mi">256</span> <span class="n">Worte</span><span class="p">,</span> <span class="n">werden</span> <span class="n">alle</span> <span class="n">dar</span><span class="err">ü</span><span class="n">ber</span> <span class="n">hinausreichenden</span> <span class="n">physikalischen</span> <span class="n">Ein</span><span class="o">-</span> <span class="n">und</span> <span class="n">Ausgangsdaten</span> <span class="k">in</span> <span class="n">einem</span> <span class="n">Speicherbereich</span> <span class="n">an</span> <span class="n">das</span> <span class="n">Ende</span> <span class="n">des</span> <span class="n">bisherigen</span> <span class="n">Prozessabbildes</span> <span class="n">und</span> <span class="n">somit</span> <span class="n">hinter</span> <span class="n">die</span> <span class="n">MODBUS</span> <span class="n">PFC</span><span class="o">-</span><span class="n">Variablen</span> <span class="n">angeh</span><span class="err">ä</span><span class="n">ngt</span> <span class="p">(</span><span class="n">jeweils</span> <span class="n">Wort</span> <span class="mi">512</span> <span class="p">...</span> <span class="mi">1275</span><span class="p">).</span> <span class="n">Im</span> <span class="n">Anschluss</span> <span class="n">an</span> <span class="n">die</span> <span class="n">restlichen</span> <span class="n">physikalischen</span> <span class="n">Busklemmendaten</span> <span class="n">werden</span> <span class="n">die</span> <span class="n">Ethernet</span> <span class="n">IP</span> <span class="n">PFC</span><span class="o">-</span><span class="n">Variablen</span> <span class="n">abgebildet</span><span class="p">.</span> <span class="n">Dieser</span> <span class="n">Speicherbereich</span> <span class="n">umfasst</span> <span class="n">Wort</span> <span class="mi">1276</span> <span class="p">...</span> <span class="mi">1531</span><span class="p">.</span> <span class="n">F</span><span class="err">ü</span><span class="n">r</span> <span class="n">zuk</span><span class="err">ü</span><span class="n">nftige</span> <span class="n">Protokoll</span><span class="o">-</span><span class="n">Erweiterungen</span> <span class="n">ist</span> <span class="n">der</span> <span class="n">anschlie</span><span class="err">ß</span><span class="n">ende</span> <span class="n">Bereich</span> <span class="n">ab</span> <span class="n">Wort</span> <span class="mi">1532</span> <span class="n">f</span><span class="err">ü</span><span class="n">r</span> <span class="n">die</span> <span class="n">weiteren</span> <span class="n">PFC</span><span class="o">-</span><span class="n">Variablen</span> <span class="n">reserviert</span><span class="p">.</span> <span class="n">Bei</span> <span class="n">allen</span> <span class="n">WAGO</span> <span class="n">Feldbus</span><span class="o">-</span><span class="n">Controllern</span> <span class="n">ist</span> <span class="n">der</span> <span class="n">Zugriff</span> <span class="n">der</span> <span class="n">SPS</span><span class="o">-</span><span class="n">Funktionalit</span><span class="err">ä</span><span class="n">t</span> <span class="p">(</span><span class="n">CPU</span><span class="p">)</span> <span class="n">auf</span> <span class="n">die</span> <span class="n">Prozessdaten</span> <span class="n">unabh</span><span class="err">ä</span><span class="n">ngig</span> <span class="n">von</span> <span class="n">dem</span> <span class="n">Feldbus</span><span class="o">-</span><span class="k">System</span><span class="p">.</span> <span class="n">Dieser</span> <span class="n">Zugriff</span> <span class="n">erfolgt</span> <span class="n">stets</span> <span class="err">ü</span><span class="n">ber</span> <span class="n">ein</span> <span class="n">anwendungsbezogenes</span> <span class="n">IEC</span> <span class="mi">61131</span><span class="o">-</span><span class="mi">3</span> <span class="n">Programm</span><span class="p">.</span> <span class="n">Der</span> <span class="n">Zugriff</span> <span class="n">von</span> <span class="n">der</span> <span class="n">Feldbusseite</span> <span class="n">aus</span> <span class="n">ist</span> <span class="n">dagegen</span> <span class="n">feldbusspezifisch</span><span class="p">.</span> <span class="n">F</span><span class="err">ü</span><span class="n">r</span> <span class="n">den</span> <span class="n">ETHERNET</span> <span class="n">TCP</span><span class="o">/</span><span class="n">IP</span> <span class="n">Feldbus</span><span class="o">-</span><span class="n">Controller</span> <span class="n">kann</span> <span class="n">entweder</span> <span class="n">ein</span> <span class="n">MODBUS</span><span class="o">/</span><span class="n">TCP</span><span class="o">-</span><span class="n">Master</span> <span class="err">ü</span><span class="n">ber</span> <span class="n">implementierte</span> <span class="n">MODBUS</span><span class="o">-</span><span class="n">Funktionen</span> <span class="n">auf</span> <span class="n">die</span> <span class="n">Daten</span> <span class="n">zugreifen</span><span class="p">,</span> <span class="n">wobei</span> <span class="n">dezimale</span><span class="p">,</span> <span class="n">bzw</span><span class="p">.</span> <span class="n">hexadezimale</span> <span class="n">MODBUS</span><span class="o">-</span><span class="n">Adressen</span> <span class="n">verwendet</span> <span class="n">werden</span><span class="p">.</span> <span class="n">Wahlweise</span> <span class="n">kann</span> <span class="n">der</span> <span class="n">Datenzugriff</span> <span class="n">auch</span> <span class="err">ü</span><span class="n">ber</span> <span class="n">Ethernet</span><span class="o">/</span><span class="n">IP</span> <span class="n">mittels</span> <span class="n">eines</span> <span class="n">Objektmodells</span> <span class="n">erfolgen</span><span class="p">.</span> </pre></div> <p>Die 12288 (= Hex 3000) findest Du ebenfalls im Handbuch unter "6.4 MODBUS Register Mapping":</p> <p>Anfangsadresse 0x0300 -&gt; Eingangsregister der PFC-Variablen (MODBUS TCP)</p></div>

2020-02-28T21:25:37.909000Z2020-02-28T21:25:37.909000ZRein Andreashttps://forge.codesys.com/u/rein-andreas/https://forge.codesys.com8daa88d8a0e7dbd73f45dadf74a3efb00912aa9b

<div class="markdown_content"><p>Ich bin ein neuling in Sachen Codesys und hab da ein Problem.</p> <p>Ich benutze das Wago I/O System 750-841.</p> <p>Ich würde gerne auf Variablen über den Modbus m it OPC zugreifen. </p> <p>Die Variable hab ich Deklariert und auch eine Merkeradresse zugewiesen, </p> <p>sie sieht so aus:</p> <p>Gaszaehler AT %MW256: REAL; </p> <p>aus anderen Foren hab ich gelesen das ich ab dem Adressbereich 12288 auf die Merker zugreifen kann.</p> <p>Wo geschieht dieser Zugriff? </p> <p>Wo sehe auf welcher tatsächlicher Adresse dir Variable ist?</p> <p>Hat jemand zufälliger weise ein kleines Tutorial oder ähnliches wo ein ähnliches Problem beschrieben ist?</p></div>