https://forge.codesys.com/forge/talk/Engineering/thread/223b8d5f19/2020-03-11T21:17:22.670000ZRecent posts to Device Application, CANopen slave, SDO mapping (V3.5.14.0)2020-03-11T21:17:22.670000Z2020-03-11T21:17:22.670000Zsgronchihttps://forge.codesys.com/u/sgronchi/https://forge.codesys.com623edaf7abb7d72854dc8f0e603ee2023dc6643e

<div class="markdown_content"><p>So you advise against using "Device Applications"? What is their purpose, then?</p></div>

2020-03-11T19:58:03.786000Z2020-03-11T19:58:03.786000Zeschwellingerhttps://forge.codesys.com/u/eschwellinger/https://forge.codesys.comefbc3a2f765bae723f776d64a1b95a57587c27cc

<div class="markdown_content"><p>Hi,<br/> i think this is the only application struct ( for multible application) which makes really sense.</p> <p><a href="https://store.codesys.com/multiple-applications.html?___store=en&amp;___from_store=default#Product%20Description" rel="nofollow">https://store.codesys.com/multiple-applications.html?<strong><em>store=en&amp;</em></strong>from_store=default#Product%20Description</a><br/> BR<br/> Edwin</p></div>

2020-03-11T19:18:47.001000Z2020-03-11T19:18:47.001000Zsgronchihttps://forge.codesys.com/u/sgronchi/https://forge.codesys.com248c66e759a1570ea7ab17d43541c726c703b8a5

<div class="markdown_content"><p>Is there anyone who knows?</p></div>

2020-02-27T14:28:13.133000Z2020-02-27T14:28:13.133000ZDavidBohttps://forge.codesys.com/u/davidbo/https://forge.codesys.comfe8b539138bef8916307dd66c684446eed204744

<div class="markdown_content"><p>I see. Now I also want to know.</p></div>

2020-02-27T14:28:12.696000Z2020-02-27T14:28:12.696000Zsgronchihttps://forge.codesys.com/u/sgronchi/https://forge.codesys.com98501ba807f5025a1be041c2607066854eea950e

<div class="markdown_content"><p>You use SDO FBs when you act as a master (have you seen the "CANopen slave" in the title?). And yes, I know the difference between PDO and SDO communication.<br/> When you are implementing a slave, Object Dictionary objects could be mapped to specific variables. However, when using Device Applications, it seems that is not the case, but why?</p></div>

2020-02-27T14:28:12.255000Z2020-02-27T14:28:12.255000ZDavidBohttps://forge.codesys.com/u/davidbo/https://forge.codesys.com05f28b880a769b744f5076f035018190c74cf4de

<div class="markdown_content"><p>I have never heard about SDO mapping I use CIA405.SDO_READ4 to read SDO and CiA405.SDO_WRITE4 to read and write SDO's.<br/> PDO are used to automatically and regularly read or write certain values. SDO is supposed to be used only when needed in order not to saturate the CAN bus.</p></div>

2020-02-27T14:28:10.976000Z2020-02-27T14:28:10.976000Zsgronchihttps://forge.codesys.com/u/sgronchi/https://forge.codesys.comfe24036e37aa29ae46ea276b1b4ea5aea8fd1f67

<div class="markdown_content"><p>My application structure (showing only nodes relevant to the problem) is like the following:</p> <div class="codehilite"><pre><span></span><span class="n">Device</span> <span class="o">|</span> <span class="o">+</span> <span class="n">Application1</span> <span class="o">|</span> <span class="o">|</span> <span class="o">|</span> <span class="o">+</span> <span class="n">Application1_Params</span> <span class="p">(</span><span class="n">Persistent</span> <span class="n">variables</span><span class="p">)</span> <span class="o">|</span> <span class="o">+</span> <span class="n">Application2</span> <span class="o">|</span> <span class="o">+</span> <span class="n">Device</span> <span class="n">Application</span> <span class="o">|</span> <span class="o">+</span> <span class="n">CANbus</span> <span class="err"> </span> <span class="o">|</span> <span class="err"> </span> <span class="o">+</span> <span class="n">CANopen</span> <span class="n">Device</span> </pre></div> <p>I would like to map SDO objects to some variables inside Application1_Params, but when clicking on the variable mapping field in CANopen Device -&gt; Object Dictionary, only global symbols defined under Device Application are reported whereas, when mapping PDO objects, globals defined in any application are available.<br/> When not using device applications, instead, global applications objects are shown. Is there a way to make this work?</p> <p>Also, no "Persistent variable configuration" (see "Creating device application" topic in Codesys Help) is available under Device Application -&gt; Add Object.</p></div>