https://forge.codesys.com/forge/talk/Engineering/thread/6aa5f1d54d/2020-02-27T14:43:24.750000ZRecent posts to Interfacing to Remote Controllers over Ethernet in Windows2020-02-27T14:43:24.750000Z2020-02-27T14:43:24.750000ZRolf-Geislerhttps://forge.codesys.com/u/rolf-geisler/https://forge.codesys.com27ab91e372ba13111ea27bb1f75c3a65bdafc166

<div class="markdown_content"><p>Hello Captain,</p> <p>you're just right: OPC is the commonly used method to communicate with PLCs.</p> <p>As far as I know, DDE is older than OLE (which is the base of OPC). ActiveX? Never heard about a PLC maker, doing the communication this way.</p> <p>Regards,</p> <p>Rolf</p></div>

2020-02-27T14:43:22.818000Z2020-02-27T14:43:22.818000ZCaptain-Edamhttps://forge.codesys.com/u/captain-edam/https://forge.codesys.com89538e3a3c3640556b1d42210d3aa922dc78aa30

<div class="markdown_content"><p>Hello All,</p> <p>I am being asked the same question more and more and it would be helpful to check I am giving the right answer.</p> <p>The question is, if I have a windows-based piece of software how do I interface with to the remote Codesys controller over the Ethernet and not use a Fieldbus card / protocol.</p> <p>My general response is that the use of the Tag file database is the key and so long as there's a OPC server in their VB / VC / C# ... system they can pass the data over the ethernet to our controller. Is that the case? Or should I be mentioning DDE Server or ActiveX stuff?</p> <p>Thanks for any help!</p></div>