https://forge.codesys.com/forge/talk/Runtime/thread/67dcaf42a0/2020-02-27T17:33:13.221000ZRecent posts to Scanning the Modbus TCP Slave port2020-02-27T17:33:13.221000Z2020-02-27T17:33:13.221000ZAnonymoushttps://forge.codesys.com/u/*anonymous/https://forge.codesys.com1d100928bc91cf634635063b940795874ab8d136

<div class="markdown_content"><p><em>Originally created by:</em> ph0010421</p> <p>Is that software behaving as a server or client? Codesys is exoecting to see a server/slave.</p></div>

2020-02-27T17:33:12.165000Z2020-02-27T17:33:12.165000ZAnonymoushttps://forge.codesys.com/u/*anonymous/https://forge.codesys.com4a31fbfca77903ef415f9176a74a1abaab39cc36

<div class="markdown_content"><p><em>Originally created by:</em> Edd.yarborough</p> <p>Hi ph0010421,<br/> Thank you for the reply, it's slowly making more sense what these codes are meaning.<br/> I also downloaded the simply modbus application, but it wont connect to my device. (I can connect to another PLC)</p> <p>My IP address is 10.100.10.140, but in the Slave IP address it is set to 10.100.10.101 (which is my other device) Is this correct? If i move this, the Bus fails to run.</p> <p>Kind regards</p> <p>Edd</p> <p><img alt="IMG: 5.PNG" rel="nofollow" src="https://forum.codesys.com//download/file.php?id=4450"/></p> <p><img alt="IMG: 4.PNG" rel="nofollow" src="https://forum.codesys.com//download/file.php?id=4449"/></p></div>

2020-02-27T17:33:09.126000Z2020-02-27T17:33:09.126000ZAnonymoushttps://forge.codesys.com/u/*anonymous/https://forge.codesys.com7fa0508b95c18d379073a0eb96064d6c8cc29b37

<div class="markdown_content"><p><em>Originally created by:</em> ph0010421</p> <p>In the 'Modbus Slave Channel' tab, the function code here dictates which area is read.<br/> For example, Function code 03, offset 0x0000 would be 40000</p> <p>Useful link <a class="" href="http://www.simplymodbus.ca/FC03.htm" rel="nofollow">http://www.simplymodbus.ca/FC03.htm</a></p></div>

2020-02-27T17:33:08.079000Z2020-02-27T17:33:08.079000ZAnonymoushttps://forge.codesys.com/u/*anonymous/https://forge.codesys.com8f891f8f2f1b55b5467a55e4cd470af6d8f3f70f

<div class="markdown_content"><p><em>Originally created by:</em> Edd.yarborough</p> <p>Hi All,<br/> I've been handed a PLC with CODESYS running. V 3.5 SP12, Patch 1. </p> <p>The programmer set up a Modbus Master, and Modbus TCP Slave, and created the mapping in there to write to the Bus. </p> <p>I can see it all working etc. </p> <p>What im struggling with is how do i scan this PLC / Modbus? I've tried many scanners, and must have a setting wrong somewhere. <br/> Does anyone know which register CODESYS is writing to? (Offset 16#0000)? Is it the 30,000 or 40,000.</p> <p>Any info would be much appreciated.</p> <p>Thank you</p> <p>Edd</p> <p><img alt="IMG: 3.PNG" rel="nofollow" src="https://forum.codesys.com//download/file.php?id=4448"/></p> <p><img alt="IMG: 2.PNG" rel="nofollow" src="https://forum.codesys.com//download/file.php?id=4447"/></p> <p><img alt="IMG: 1.PNG" rel="nofollow" src="https://forum.codesys.com//download/file.php?id=4446"/></p></div>