Version 8.10 introduced specific enhancements aimed at modular SLCs and expanding OS support at the time: What Is RSLogix? - RealPars
: Allows you to test and run your ladder logic programs without physical hardware. Key Version 8.1 Enhancements New Hardware Support : Added compatibility for MicroLogix 1400 MicroLogix 1100 Series B Expanded Messaging : Support for DNP3 Slave Modbus RTU Master communication protocols. Software Activation : Versions 8.1 and later require a valid serial number Rslogix 500 Version 8.1 Download
: You can choose between a Managed Download (using Rockwell’s download manager tool) or a Direct Download for individual files. Key Features and Compatibility Version 8