RSLogix 5000 with a controller at firmware revision 20.12 , you must ensure your programming software matches the major revision of the hardware. The Automation Blog 1. Software Compatibility Version Matching : There is no RSLogix 5000 version "20.12." You should use RSLogix 5000 Version 20.01 Minor Revision Note
Version 21 marked the introduction of the "Studio 5000" branding. Unfortunately, Version 21 was notoriously buggy for many users. Firmware 20.12 provides the stability of the classic RSLogix interface (which many senior engineers strongly prefer) with modern security patches. It allows you to stay in the familiar environment while still supporting new hardware features.
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Several issues and challenges have been associated with the v20 firmware series:
Released in the early 2010s, Version 20 represented a mature state of the Logix5000 platform. It arrived after the tumult of Version 19 (which introduced Add-On Profiles but suffered from initial stability bugs) and before the introduction of the "Studio 5000" rebranding and the compact .ACD file storage format changes in Version 21. RSLogix 5000 with a controller at firmware revision 20
Rockwell has declared that Version 20 firmware is in "Extended Service Life." While they no longer release new features, they have finalized the revision. If your system is running V20.01 or V20.03, upgrading to 20.12 is a low-risk, high-reward maintenance action.
While many users simply refer to "Version 20," the minor revision typically includes stability patches and security bug fixes over the original 20.01 release. It is generally recommended to use the latest minor revision (like 20.12 or 20.15) to ensure compatibility with newer Windows security updates. Unfortunately, Version 21 was notoriously buggy for many
: Resolves minor memory leaks associated with frequent visual representation changes in User-Defined Data Types (UDTs).
❗ You need or a valid support agreement to download. If you don’t have one, contact your local Rockwell distributor.