RSLogix Emulate is software that emulates PLC-5 and SLC 500 processors, allowing users to test and debug ladder logic programs on a PC before commissioning. It scans ladder logic like an actual processor and handles I/O emulation through debug files. Key features include the ability to stop program scanning when specific conditions are met, different scanning modes, and emulating serial communications for hardware integration testing. The software packages require a 486 PC or greater running Windows 95 or NT with sufficient memory and graphics capabilities.