Where can I find a list of discrete inputs and outputs

I am just beginning to learn about parametric programming. I have been searching for a comprehensive list of discrete inputs and outputs for the haas machines I use (sl-20, vf-1, vf-2, vf-2ss, vf-4, vf-5, ec-400).
Are the discretes software version/machine specific, or do they carry between software versions and machines?
Is there somewhere I can get a list?
I have contacted my HFO, and am waiting for a reply from them.