https://forge.codesys.com/forge/talk/Runtime/thread/4592ae8eaa/2020-02-27T17:24:38.801000ZRecent posts to Need help for Modbus TCP beetwen RPI and PLC2020-02-27T17:24:38.801000Z2020-02-27T17:24:38.801000Zgroyhttps://forge.codesys.com/u/groy/https://forge.codesys.com01d86543de966363ca89c89842a6603f55528af6

<div class="markdown_content"><p>Hi Edwin,</p> <p>Thank you for your explanation, I don't know if it must process in Pou </p> <p>Roy</p></div>

2020-02-27T17:24:35.998000Z2020-02-27T17:24:35.998000Zeschwellingerhttps://forge.codesys.com/u/eschwellinger/https://forge.codesys.com9a72d01042159ea9de61ffc06b866caaf2818a9d

<div class="markdown_content"><p>Hi,<br/> You need to call the mapped variables somewhere in the Pou's if not called tge values will not updated.<br/> BR<br/> Edwin</p></div>

2020-02-27T17:24:34.882000Z2020-02-27T17:24:34.882000Zgroyhttps://forge.codesys.com/u/groy/https://forge.codesys.comdea5af55d89f31a413d4a188a1e102b3dac420e3

<div class="markdown_content"><p>Hi everyone,<br/> I try to use Modbus TCP beetwen RPI and PLC and I also make init with "Modbus Slave Init" and the value was transfered to PLC. I try read holding register at 0x0000 and all status in codesys "device" is ok but why my value is always zero even though I change the value. I used another tool as Modbus TCP master but the value is good, could anyone help me for this problem?</p> <p>Regards<br/> Roy</p> <p><img alt="IMG: MB_RPI.jpg" rel="nofollow" src="https://forum.codesys.com//download/file.php?id=3438"/></p></div>