Classicladder TCP setup ?

I don't really know. Are you getting any information (errors) in the terminal?

Also if you use the default port 9502 do you see anything on wireshark at all?

edit:
Can you post your clp file?

Just to throw it in here, only in case you haven't heard of it before.
There is a component called MB2HAL, which also allows you to connect to Modbus-TCP devices.
linuxcnc.org/docs/2.9/html/drivers/mb2hal.html
If you are using Classicladder only for Modbus you can consider using this. Or to test the connection to ensure the hardware is connected properly.

Thank you, I know and use Mb2hal is a great soft.
If I find time for further tests, I will let you know what has worked.