Connecting to remote Codesys PLC via OpenVPN

vladmen · May 2, 2025, 2:15pm

I’m trying to connect to Codesys running on CMT2078X.
OpenVPN creates a Virtual IP address for each device on the Network. When trying to add device with this virtual address via UDP/IP Codesys does not accept it saying there is no route to this address, when using TCP/IP it just scanning the network and does not add device.
TAP adapter is running and I can access other device on the network

AaronS · May 2, 2025, 4:19pm

Hi vladmen,

Thank you for your question. What LAN port are you using to connect your OpenVPN to Codesys.

-Aaron

vladmen · May 2, 2025, 4:31pm

Both ports on HMI are connected to the local Ethernet switch, which is connected to VPN device.

AaronS · May 2, 2025, 5:01pm

Could you try running a ping test to verify if the IP address you’re trying to reach is currently active and responding?

vladmen · May 2, 2025, 5:14pm

Yes, I can ping it via virtual IP address

AaronS · May 2, 2025, 5:26pm

That is good to hear. Next you provide me the Codesys version you are using and a picture of your Codsys IDE like the example below:

vladmen · May 2, 2025, 5:44pm

Codesys V3.5 SP15 Patch5 + (64-bit)

Getting an error when trying to attach image to the post

AaronS · May 2, 2025, 5:46pm

Could you uploading one more time.

vladmen · May 2, 2025, 5:47pm

vladmen · May 2, 2025, 5:49pm

Here are a couple more images to illustrate my setup

vladmen · May 2, 2025, 5:50pm

AaronS · May 2, 2025, 5:55pm

Can you try the following:

Please enter the virtual IP address directly into the drop-down menu to establish the connection.

image1741×759 116 KB
Could you also enable Codesys login as in this post: How to enable Codesys login

Also one more question. Is the virtual IP at 10.16.32.20 routed through LAN1 or LAN2?

vladmen · May 2, 2025, 5:58pm

That did it.

Thank you so much for your support.