Hello! I'm new to the site and I need some help.

I have a Concept Mill 55 being run from a Fanuc 21 and PC. I'm currently in a school project to integrate it with some PLC that we have. The Mill has the robotics I/O interface installed. I understand the interface, and WinNC pretty well, but I'm having issues setting up the programming to get the input and output signals into my programs, I've tried a lot of things and am running out of ideas. Does anyone have experience and can help me with this? I'm stuck on a few things specifically;

It mentions a "special program" an I/O debugger pops up, and that's all I can find, is that what I'm looking for? If so, how do I use it? What are the "addresses" I can define?

How do I reference these inputs and outputs as logic variables?

I've been kind of on my own here, thanks in advance for the help.