For version 21, the following specs are generally recommended for stable performance: RSLogix Emulate 5000 - Rockwell Automation Support
The standard public release of RSLogix 5000 (the software used to program ControlLogix) is version 21.00.00. However, you will encounter references to (also written as 21.01.00 or “v21 L” in release notes). The “L” designates a minor revision specifically intended for use with the EMU (Emulator) hardware target. Rslogix Emulate 5000 V21l
Once V21L is flashed, you can create a project in RSLogix 5000: For version 21, the following specs are generally