feel free to be confused ...
Greetings roxtech ...
my distinguished colleague OZEE is correct - you need RSLogix5000 ...
going a bit further:
if your system was originally programmed with Version 13 (for example) then you will need a copy of Version 13 in order to work with the existing program ... specifically, Version 16 (the latest available) will NOT work ... more specifically, programs written with one version are not compatible with any other version ...
also ... the “basic” programming language is ladder logic - but there are other formats available as “add-on options” ...
these options are Structured Text, Function Block Diagrams, and Sequential Function Charts ... these cannot be accessed with the standard (ladder logic only) software package ...
survival tip: find out what you need before you start buying anything ... in other words, it’s common to order the RSLogix5000 software and then find out that you still can’t work with an existing program file until you also order any “extra cost” options that the original programmer might have used ...
if you have more questions after reading this, post again and we’ll try to help ... your Allen-Bradley distributor should also be able to help you sort all of this out ...