https://forge.codesys.com/forge/talk/Runtime/thread/f249aa695d/2020-02-27T15:40:49.306000ZRecent posts to Modbus Master / Slave with 2 RPs2020-02-27T15:40:49.306000Z2020-02-27T15:40:49.306000Zrasputin86https://forge.codesys.com/u/rasputin86/https://forge.codesys.com734e893b2120a984b7e4266ef8e0b29039c76523

<div class="markdown_content"><blockquote> <p><strong>Edwin Schwellinger hat geschrieben:</strong><br/> Hi,<br/> use attched example.<br/> BR<br/> Edwin</p> </blockquote> <p>Thank you, very much!<br/> Now I've understand it...and the two rapsberry runs!</p></div>

2020-02-27T15:40:47.202000Z2020-02-27T15:40:47.202000Zeschwellingerhttps://forge.codesys.com/u/eschwellinger/https://forge.codesys.com1ba332aa9dc6c8151040138e6773e556a941ccfb

<div class="markdown_content"><p>Hi,</p> <p>use attched example.<br/> BR<br/> Edwin</p> <p><a class="" href="https://forum.codesys.com//download/file.php?id=2132" rel="nofollow">2RaspisModbusMasterSlaveCommunication.project <span><span>[86 KiB]</span></span></a></p></div>

2020-02-27T15:40:46.493000Z2020-02-27T15:40:46.493000Zrasputin86https://forge.codesys.com/u/rasputin86/https://forge.codesys.com88534687e08ffefd79bfc3f5de2ca6e4f09e6b4d

<div class="markdown_content"><p>Hallo,</p> <p>ich need some help to get run my two pis over modbus/tcp.<br/> I have done all steps (Master Modbus) in the description of "jvondrus", but my modbus slave dont run?<br/> What "set length" I need? </p> <p>What can I do?</p></div>

2020-02-27T15:40:45.780000Z2020-02-27T15:40:45.780000Zjvondrushttps://forge.codesys.com/u/jvondrus/https://forge.codesys.com7dc5767709b967fdeda4db9c12a92cb9f701a266

<div class="markdown_content"><p><strong>Master Modbus</strong></p> <p>1) Add device : Ethernet &gt; Ethernet adapter<br/> 2) Set ethernet adapter: Double click on it, set interface, IP ...<br/> 3) Add device : Modbus &gt; Modbus TCP Master<br/> 4) Set Modbus Master device : Mark auto-reconnect<br/> 5) Add device : Modbus &gt; Modbus TCP Slave<br/> 6) Set Modbus Slave device : <br/> General: Set Slave (2nd RPi) IP address, port, unit ID<br/> Slave Channel: Add channel (Reading -FC4 / Writing -FC16 / Both -FC23), set offset to 0x0000, set length<br/> Add I/O mapping, I'm using full address to WORD, like "Application.PLC_PRG.modbusIn", where "modbusIn" are devined at PLC_PRG as "modbusIn : ARRAY <span>[0..3]</span> OF WORD;"<br/> 7) Go to Device (CODESYS ... Raspberry Pi) &gt; PLC settings and set Bus cycle task to "MainTask"<br/> Compile<br/> 9) If you are getting some warnings declared variables at library, make a change at LibraryManager. Set version of IoDrvModbusTCP from "3.5.6.0" to "3.5.4.0".<br/> 10) Compile<br/> 11) It's done </p> <p><strong>Modbus Slave</strong><br/> 1) Add device : Ethernet &gt; Ethernet adapter<br/> 2) Set ethernet adapter: Double click on it, set interface, IP ...<br/> 3) Add device : Modbus &gt; Modbus TCP Slave<br/> 4) Set Modbus Slave device : <br/> General: Set slave port, ID, WORD length<br/> Add I/O mapping, I'm using full address to WORD, like "Application.PLC_PRG.modbusOut", where "modbusOut" are defined at PLC_PRG as "modbusOut" : ARRAY <span>[0..3]</span> OF WORD;"<br/> Set bus cycle and updating variables to "Use parent device/bus setting"<br/> 5) Go to Device (CODESYS ... Raspberry Pi) &gt; PLC settings and set Bus cycle task to "MainTask"<br/> 6) Compile<br/> 7) It's done </p> <p>Both Upload<br/> Run Both device program<br/> All done and data are flowing, I hope </p></div>

2020-02-27T15:40:43.774000Z2020-02-27T15:40:43.774000Zjvondrushttps://forge.codesys.com/u/jvondrus/https://forge.codesys.comc51b33918da9c65d970a3f7b086b714428e08d50

<div class="markdown_content"><p>Hello,<br/> I'm lookig for same connection, do you have some new info about connesc 2 RPis via Modbus?</p> <p>Thank you.</p></div>

2020-02-27T15:40:43.021000Z2020-02-27T15:40:43.021000Zlstieglerhttps://forge.codesys.com/u/lstiegler/https://forge.codesys.com00e9691f1c22930b672e6c1579148a80b5dcb105

<div class="markdown_content"><p>Hello,<br/> is there any modbus/TCP example with two Rasperry Pi ?</p> <p>Thank you in advance<br/> Best Regards<br/> Leonhard Stiegler</p></div>