https://forge.codesys.com/forge/talk/Runtime/thread/a39b7e5773/2020-02-27T15:17:02.874000ZRecent posts to Speed communication of shared memory solution between CodeSYS and C++2020-02-27T15:17:02.874000Z2020-02-27T15:17:02.874000Zjohnleehttps://forge.codesys.com/u/johnlee/https://forge.codesys.comf5541507b7373cf86038cffbfc4984d7adb813ba

<div class="markdown_content"><p>Hi vmphuc,</p> <p>I have done the similar project for share memory with VB. net, as my cycle time is about 10ms. And data will not lost.</p> <p>to have this kind of share memory or udp data exchange is also depend how you structure the data you want to exchange.</p> <p>You can always have a practice that also have a fix length data to transfer, then you can have a fast cycle time to exchange data.</p></div>

2020-02-27T15:17:01.050000Z2020-02-27T15:17:01.050000Zvmphuchttps://forge.codesys.com/u/vmphuc/https://forge.codesys.com30b0e9936c8a9b55328fbd02d107b128b714c1c7

<div class="markdown_content"><blockquote> <p><strong>Edwin Schwellinger hat geschrieben:</strong><br/> Hi,<br/> yes ok should be way faster.... <br/> Are you using this example here?<br/> <a class="" href="https://store.codesys.com/shared-memory-communication.html#System" rel="nofollow">https://store.codesys.com/shared-memory ... tml#System</a> Requirements<br/> BR<br/> Edwin</p> </blockquote> <p>Hi Mr. Edwin,</p> <p>I made my code based on this example, but speed communication is very slow. <br/> Can I use UDP to exchange data between C++ and PLC? What library should I use? I see that there are many library such as CAA net base, SysSocket,...</p> <p>Best regards,<br/> PHUC</p></div>

2020-02-27T15:17:00.404000Z2020-02-27T15:17:00.404000Zeschwellingerhttps://forge.codesys.com/u/eschwellinger/https://forge.codesys.com5993c4e156ea7d16122d9ff05fa75f782119415d

<div class="markdown_content"><p>Hi,<br/> yes ok should be way faster.... </p> <p>Are you using this example here?</p> <p><a class="" href="https://store.codesys.com/shared-memory-communication.html#System" rel="nofollow">https://store.codesys.com/shared-memory ... tml#System</a> Requirements</p> <p>BR<br/> Edwin</p></div>

2020-02-27T15:16:59.776000Z2020-02-27T15:16:59.776000Zvmphuchttps://forge.codesys.com/u/vmphuc/https://forge.codesys.comc35e47904c927cf39f66d9559dba962bdc34dbee

<div class="markdown_content"><p>Hi Mr. Edwin Schwellinger,</p> <p>I use Codesys Control RTE SL which is in following link:<br/> <a class="" href="https://store.codesys.com/codesys-control-rte-sl.html?___store=en" rel="nofollow">https://store.codesys.com/codesys-contr ... __store=en</a></p> <p>Anyway, could you please let me know which is fastest way to exchange data between PLC and C++ applicaiton?</p> <p>Best regards,<br/> Mr. PHUC</p></div>

2020-02-27T15:16:57.965000Z2020-02-27T15:16:57.965000Zeschwellingerhttps://forge.codesys.com/u/eschwellinger/https://forge.codesys.com3359f48581af9a5266b198cf13b0d691308bbaea

<div class="markdown_content"><p>Hi,<br/> we need more Information:<br/> On which plc are you doing this?<br/> This should work way faster.<br/> BR<br/> Edwin</p></div>

2020-02-27T15:16:57.334000Z2020-02-27T15:16:57.334000Zvmphuchttps://forge.codesys.com/u/vmphuc/https://forge.codesys.combe48a0cafabc959e844c953bd358ef7209ed1926

<div class="markdown_content"><p>Dear all,</p> <p>I would like to use Shared memory to exchange data between CodeSys and C++ app. However, I realized the speed of communication is very slow.<br/> Every 50ms, I write data from C++ to memory and Codesys read it, but Codesys missed data in some period cycle.<br/> Does anyone know how speed of this kind of exchange data using shared memory? Please help me, I would very appreciate and welcome your helps.</p> <p>Thank you,</p></div>