https://forge.codesys.com/forge/talk/Engineering/thread/b64d1757e2/2021-04-14T21:31:07.206000ZRecent posts to How do you change the 'read offset' of a Modbus channel on the fly?2021-04-14T21:31:07.206000Z2021-04-14T21:31:07.206000Zdengsberghttps://forge.codesys.com/u/dengsberg/https://forge.codesys.come2af974d00e5f151c5d5987a75607b66a1fd31c4

<div class="markdown_content"><p>Hi Blewl,<br/> Did you end up with a workable solution? I am using the Modbus_TCP_Slave by adding it to the device tree under the Modbus_TCP_Master. I need to allow the user to change the slave device Offset setting through the HMI. It seems that value is not accessible in runtime.</p> <p>I'm not really sure I understand the response from dFx in using a ModbusTCP Slave FB. I'm still a beginner, and also mostly just familiar structured text. Any more info on that would be very helpful.<br/> Thanks.</p></div>

2020-02-27T13:53:56.119000Z2020-02-27T13:53:56.119000ZdFxhttps://forge.codesys.com/u/dfx/https://forge.codesys.com0fc5ab1c724334af69293a004a08e21b3d205a79

<div class="markdown_content"><p>Hi Blewl,</p> <p>as far as I know, you can't use your scanner. Instead use a ModbusTCPSlave FB, or build it from CAA.NetBaseServices.<br/> For schneider PLC, they provide SE_Communication lib with include a TCPSlave FB.</p> <p>Best regards,<br/> dFx</p></div>

2020-02-27T13:53:55.952000Z2020-02-27T13:53:55.952000Zblewlhttps://forge.codesys.com/u/blewl/https://forge.codesys.comaf88467b9ae8514473f232e72988142eabbf9bff

<div class="markdown_content"><p>Hi</p> <p>I am setting up a test rig to test Modbus TCP. The user can enter in one of 250 parameters to either read or write. I don't want to make 500 channels for reading and writing the parameters, when I can make 2 and change the offset value. How do I do this, do I need some sort of pointer or global variable?</p> <p>Currently the offset is 0 for both, see attached.</p> <p>Thanks</p> <p><img alt="IMG: Untitled.png" rel="nofollow" src="https://forum.codesys.com//download/file.php?id=4155"/></p></div>