https://forge.codesys.com/forge/talk/Engineering/thread/51e10c54cf/2020-07-08T15:31:48.084000ZRecent posts to Read/Write Modbus register from Scada/HMI2020-07-08T15:31:48.084000Z2020-07-08T15:31:48.084000Zmorberishttps://forge.codesys.com/u/morberis/https://forge.codesys.com2c3dcb00c54a291e4e89e61ab7dc15b40f752f65

<div class="markdown_content"><p>Sorry I'm a bit confused, entirely on my end. Do you mean writing a variable to a channel without using the modbus function codes?</p> <p>As in instead of writing register 100 with function code 6 you want to send 6x0100 or something like that? I'm not sure if I'm correct about it being 6x0100 so I apologize if I'm incorrect.</p> <p>I honestly don't know. Try looking at the IoDrvModbus library. </p> <p><a href="https://help.codesys.com/webapp/_mod_f_libraries;product=core_modbus_configuration_editor;version=3.5.15.0" rel="nofollow">https://help.codesys.com/webapp/_mod_f_libraries;product=core_modbus_configuration_editor;version=3.5.15.0</a></p></div>

2020-07-08T09:58:32.937000Z2020-07-08T09:58:32.937000Zjohanthttps://forge.codesys.com/u/johant/https://forge.codesys.com8be39a0f99a8d6134f32084f1d570342c520f752

<div class="markdown_content"><p>Hello,<br/> I am working on a Project that consists on controlling IAI axis via MODBUS RTU with a Raspberry pi based on codesys, and I need some support. I would like to know if there is any function to write variable´s values directly in modbus communication channels. Instead of linking them in the Reading and writing channels, I want to know if there is any function to write these variable´s values in the communication channels automatically.<br/> I will be waiting for your answer.</p> <p>Thank you.</p></div>

2020-02-27T13:50:53.139000Z2020-02-27T13:50:53.139000ZdFxhttps://forge.codesys.com/u/dfx/https://forge.codesys.com6390456cc538018eab6d6b376d93f3f511170c02

<div class="markdown_content"><p>If your scada dont cyclically writes, it's still possible. (This implies your plc supports modbus RTU slave or modbus TCP server)</p></div>

2020-02-27T13:50:52.994000Z2020-02-27T13:50:52.994000ZTiakTiakhttps://forge.codesys.com/u/tiaktiak/https://forge.codesys.comf5722155598623defb1b73b43bf7e73ec4b2437a

<div class="markdown_content"><p>Hi Everyone</p> <p>In CodeSys 2.x it was possible to just to declare a variable like this. PLCTag AT %MW0 :INT; (<em> Variable Int modbus addr 12288</em>) <br/> Then it was possible to access this variable from a Scada/HMI via Modbus. <br/> If a counter in the controller is counting on PLCTag register, it was possible to read that value in the Scada/HMI but also possible to change from the SCADA/HMI side.</p> <p>Now in CodeSys 3.x it seems that this is not possible anymore. CAN THAT really be true???<br/> Thx</p></div>