I encounter many troubles to connect to the PLC, for that, I use the libnodave library.
Here are the last informlations I got : CPU 412-2 Communication : CP 443-1
So far, I manage to connect to the automaton, but, if I use the - UserTransport protocol, my programs crashes when I try to read a datum - ISOTPC or MPI protocols, I can't connect to the PLC ...
So far, my code isn't so different with this one : http://www.automation-sense.com/medias/images/source-code-and-example-visual-basic-libnodave.jpg
In my case, the port number is 25, the rack value is 0 and the slot value is 3.
What may you suggest me to do?
Thanks