https://forge.codesys.com/forge/talk/CODESYS-V2/thread/dc523b12a0/2020-02-27T21:52:25.021000ZRecent posts to MODBUS RTU2020-02-27T21:52:25.021000Z2020-02-27T21:52:25.021000Zsamuelhttps://forge.codesys.com/u/samuel/https://forge.codesys.com1a5f3509a3884f88ec8d6637b6b3bb3162fad46e

<div class="markdown_content"><p>Hi!</p> <p>First of all you must specify some things:</p> <p>1) Which PLC are you using?</p> <p>2) Are you using your PLC as a master or slave?</p> <p>3) Which devices are you planning to communicate?</p> <p>Please have a look at these documents:</p> <p><a class="" href="http://www.modbus.org/specs.php" rel="nofollow">http://www.modbus.org/specs.php</a></p> <p><a class="" href="http://library.abb.com/global/scot/scot209.nsf/veritydisplay/3e4a3ea45d86788fc125739f0028b2b4/$File/2CDC125022M0102.PDF" rel="nofollow">http://library.abb.com/global/scot/scot ... 2M0102.PDF</a></p> <p>For instance, ABB AC500 series include MODBUS RTU as a default. You need to set up your serial ports (in Hardware Browser) and your Modbus master needs to use COM_MOD_MAST Function Block. If you need it, I can try to get ABB's application note.</p> <p>You can also test your Modbus RTU Master with this open source tool:</p> <p><a class="" href="http://qmodbus.sourceforge.net/" rel="nofollow">http://qmodbus.sourceforge.net/</a></p> <p>Good Luck!</p></div>

2020-02-27T21:52:23.527000Z2020-02-27T21:52:23.527000Zmvkchowdaryhttps://forge.codesys.com/u/mvkchowdary/https://forge.codesys.com49f9ed1525fa26af4c5ac6f703c1f4cf327555d6

<div class="markdown_content"><p>Dear All</p> <p>Can any one help me in getting the MODBUS RTU library available to communcate on RS485 please.</p></div>