I'm a college student, and my current co-op is my first introduction to PLC's. The vast majority of the work I've been doing involves SLC500's, however, we have a ControlLogix setup in the lab for testing and learning purposes. Anyway, I was wondering where the ControlLogix gear fits into the AB line with respect to the SLC500. They're about the same size, have similar I/O modules, etc, so I was hoping someone could give me a basic explanation of how the two are different.