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pyhoff
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<li class="toctree-l1 current"><a class="current reference internal" href="#">Pyhoff</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="#description">Description</a><ul>
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<li class="toctree-l3"><a class="reference internal" href="#key-features">Key Features</a></li>
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<li class="toctree-l3"><a class="reference internal" href="#usage-scenarios">Usage Scenarios</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#installation">Installation</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#usage">Usage</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#contributing">Contributing</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#developer-guide">Developer Guide</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#license">License</a></li>
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<a href="_sources/readme.md.txt" rel="nofollow"> View page source</a>
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<div itemprop="articleBody">
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<section id="pyhoff">
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<h1>Pyhoff<a class="headerlink" href="#pyhoff" title="Link to this heading"></a></h1>
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<section id="description">
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<h2>Description<a class="headerlink" href="#description" title="Link to this heading"></a></h2>
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<p>The pyhoff package allows you to read and write the most common
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Beckhoff and WAGO bus terminals (“Busklemmen”) using the Ethernet bus
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coupler (“Busskoppler”) BK9000, BK9050, BK9100, or WAGO 750_352
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over Ethernet TCP/IP based on ModBus TCP.</p>
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<section id="key-features">
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<h3>Key Features<a class="headerlink" href="#key-features" title="Link to this heading"></a></h3>
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<ul class="simple">
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<li><p>Supports a wide range of Beckhoff and WAGO analog and digital bus
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terminals.</p></li>
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<li><p>Very lightweight: no dependencies; compact code base</p></li>
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<li><p>Easy to extend</p></li>
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<li><p>Using standardized ModBus TCP.</p></li>
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<li><p>Provides high-level abstractions for reading and writing data
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from/to IO-terminals with minimal code</p></li>
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</ul>
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</section>
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<section id="usage-scenarios">
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<h3>Usage Scenarios<a class="headerlink" href="#usage-scenarios" title="Link to this heading"></a></h3>
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<ul class="simple">
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<li><p>Industrial test setups.</p></li>
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<li><p>Research automation setups.</p></li>
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<li><p>Data acquisition and monitoring.</p></li>
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</ul>
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</section>
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</section>
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<section id="installation">
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<h2>Installation<a class="headerlink" href="#installation" title="Link to this heading"></a></h2>
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<p>The package has no additional decencies. It can be installed with pip:</p>
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<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>pip<span class="w"> </span>install<span class="w"> </span>pyhoff
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</pre></div>
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</div>
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</section>
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<section id="usage">
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<h2>Usage<a class="headerlink" href="#usage" title="Link to this heading"></a></h2>
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<p>It is easy to use as the following example code shows:</p>
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<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span><span class="w"> </span><span class="nn">pyhoff.devices</span><span class="w"> </span><span class="kn">import</span> <span class="o">*</span>
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<span class="c1"># connect to the BK9050 by tcp/ip on default port 502</span>
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<span class="n">bk</span> <span class="o">=</span> <span class="n">BK9050</span><span class="p">(</span><span class="s2">"172.16.17.1"</span><span class="p">)</span>
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<span class="c1"># add all bus terminals connected to the bus coupler</span>
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<span class="c1"># in the order of the physical arrangement</span>
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<span class="n">bk</span><span class="o">.</span><span class="n">add_bus_terminals</span><span class="p">(</span><span class="n">KL2404</span><span class="p">,</span> <span class="n">KL2424</span><span class="p">,</span> <span class="n">KL9100</span><span class="p">,</span> <span class="n">KL1104</span><span class="p">,</span> <span class="n">KL3202</span><span class="p">,</span>
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<span class="n">KL3202</span><span class="p">,</span> <span class="n">KL4002</span><span class="p">,</span> <span class="n">KL9188</span><span class="p">,</span> <span class="n">KL3054</span><span class="p">,</span> <span class="n">KL3214</span><span class="p">,</span>
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<span class="n">KL4004</span><span class="p">,</span> <span class="n">KL9010</span><span class="p">)</span>
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<span class="c1"># Set 1. output of the first KL2404-type bus terminal to hi</span>
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<span class="n">bk</span><span class="o">.</span><span class="n">select</span><span class="p">(</span><span class="n">KL2404</span><span class="p">,</span> <span class="mi">0</span><span class="p">)</span><span class="o">.</span><span class="n">write_coil</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="kc">True</span><span class="p">)</span>
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<span class="c1"># read temperature from the 2. channel of the 2. KL3202-type</span>
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<span class="c1"># bus terminal</span>
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<span class="n">t</span> <span class="o">=</span> <span class="n">bk</span><span class="o">.</span><span class="n">select</span><span class="p">(</span><span class="n">KL3202</span><span class="p">,</span> <span class="mi">1</span><span class="p">)</span><span class="o">.</span><span class="n">read_temperature</span><span class="p">(</span><span class="mi">2</span><span class="p">)</span>
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<span class="nb">print</span><span class="p">(</span><span class="sa">f</span><span class="s2">"t = </span><span class="si">{</span><span class="n">t</span><span class="si">:</span><span class="s2">.1f</span><span class="si">}</span><span class="s2"> °C"</span><span class="p">)</span>
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<span class="c1"># Set 1. output of the 1. KL4002-type bus terminal to 4.2 V</span>
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<span class="n">bk</span><span class="o">.</span><span class="n">select</span><span class="p">(</span><span class="n">KL4002</span><span class="p">,</span> <span class="mi">0</span><span class="p">)</span><span class="o">.</span><span class="n">set_voltage</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="mf">4.2</span><span class="p">)</span>
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</pre></div>
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</div>
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</section>
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<section id="contributing">
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<h2>Contributing<a class="headerlink" href="#contributing" title="Link to this heading"></a></h2>
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<p>Other analog and digital IO terminals are easy to complement. Contributions are welcome!
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Please open an issue or submit a pull request on GitHub.</p>
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</section>
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<section id="developer-guide">
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<h2>Developer Guide<a class="headerlink" href="#developer-guide" title="Link to this heading"></a></h2>
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<p>To get started with developing the <code class="docutils literal notranslate"><span class="pre">pyhoff</span></code> package, follow these steps:</p>
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<ol class="arabic">
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<li><p><strong>Clone the Repository</strong>
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First, clone the repository to your local machine using Git:</p>
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<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>git<span class="w"> </span>clone<span class="w"> </span>https://github.com/Nonannet/pyhoff.git
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<span class="nb">cd</span><span class="w"> </span>pyhoff
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</pre></div>
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</div>
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</li>
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<li><p><strong>Set Up a Virtual Environment</strong>
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It is recommended to use a virtual environment to manage dependencies. You can create one using <code class="docutils literal notranslate"><span class="pre">venv</span></code>:</p>
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<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>python<span class="w"> </span>-m<span class="w"> </span>venv<span class="w"> </span>venv
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<span class="nb">source</span><span class="w"> </span>venv/bin/activate<span class="w"> </span><span class="c1"># On Windows use `venv\Scripts\activate`</span>
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</pre></div>
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</div>
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</li>
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<li><p><strong>Install Dev Dependencies</strong>
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Install pyhoff from source plus the dependencies required for development using <code class="docutils literal notranslate"><span class="pre">pip</span></code>:</p>
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<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>pip<span class="w"> </span>install<span class="w"> </span>-e<span class="w"> </span>.<span class="o">[</span>dev<span class="o">]</span>
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</pre></div>
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</div>
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</li>
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<li><p><strong>Run Tests</strong>
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Ensure that everything is set up correctly by running the tests:</p>
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<div class="highlight-bash notranslate"><div class="highlight"><pre><span></span>pytest
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</pre></div>
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</div>
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</li>
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</ol>
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</section>
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<section id="license">
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<h2>License<a class="headerlink" href="#license" title="Link to this heading"></a></h2>
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<p>This project is licensed under the MIT License - see the <a class="reference internal" href="#LICENSE"><span class="xref myst">LICENSE</span></a> file for details.</p>
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</section>
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<p>© Copyright 2025, Nicolas Kruse.</p>
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