Jim, Because you are a student, you might want to get a copy of the LogixPro Simulator propgram. It will let you write, run, test, and edit a program that simulates a RSLogix program (about like running on an Allen-Bradley SLC 5/02) with 7 slots, Slots 1 and 3 are 16-bit digital inputs, slots 2 and 4 are 16-bit digital outputs, slot 5 is a BCD input with 4-digit thumbwheel, slot 6 is a BCD Outut with a digital display.Downloaded all of those but cant get the emulator to work with Microsoft vista or 7. I can write the programs with RS500 but cant check them.
Download and try it free for 15 days. If you want to keep using, the fee is only $30, or $40 for a CD version. Students can get discounts if purchased through your school.
http://www.thelearningpit.com/