[2021] - Rslogix 5000 Firmware 20.12

RSLogix 5000 version 20.12 is a significant firmware release from Rockwell Automation, primarily known for being one of the final stable revisions of the RSLogix 5000 brand before it transitioned to the Studio 5000 Logix Designer name at version 21. Key Functions and Role

RSLogix 5000 v20.12 serves as the programming environment for ControlLogix and CompactLogix PACs (Programmable Automation Controllers). It is often maintained in industrial environments to support "legacy" hardware that does not support the higher resource requirements of the newer Studio 5000 versions.

Project Compatibility: It is the standard for projects using version 20 firmware on the controller.

Hardware Support: This version is widely used with 1756-L6x and early 1756-L7x ControlLogix controllers, as well as several 1769 CompactLogix models.

Transition Point: V20 is the highest version supported by many older "Standard" series controllers (like the L61) that lack the memory or architecture to run V21 or higher. Installation and Operating Systems rslogix 5000 firmware 20.12

According to Rockwell Automation compatibility notes, RSLogix 5000 version 20 is compatible with several older and modern operating systems: Windows 10 Professional (64-bit): Version 1703 and later. Windows 7 Professional (64-bit): Service Pack 1.

Virtual Environments: It is commonly deployed in VMware or Hyper-V virtual machines to isolate its specific .NET and dependency requirements from newer software versions. Maintenance & Firmware Management

Updating a controller to or from version 20.12 involves specific steps using the ControlFlash utility:

Viewing Revision: You can verify the current firmware of a connected PLC by expanding the communication path in RSLinx. RSLogix 5000 version 20

Changing Versions: To move a project to a different version, you must right-click the controller in the project tree, select "Properties," and use the "Change Controller" button to adjust the software revision.

Risks: Note that changing versions can sometimes cause issues with Add-On Instructions (AOIs) that were built on different versions. Why Version 20.12 specifically?

While many users simply refer to "Version 20," the minor revision .12 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.

The "Version 20" Necessity

To understand v20.12, you first have to understand the hardware landscape of the early-to-mid 2010s. Rockwell released the CompactLogix 5370 and ControlLogix 5570 controllers. These controllers were powerful, but many of them were "locked" to specific firmware versions. The "Version 20" Necessity To understand v20

Unlike older Logix5550 controllers that could run a wide range of firmware, many 5370 controllers required Version 20 to function. You couldn't downgrade them to v19, and upgrading them to v21 wasn't always an option depending on the specific catalog number.

This created a scenario where Version 20 wasn't just a choice; it was a hard requirement for a massive chunk of the installed base.

Security Considerations for Firmware 20.12

This is a critical point. Firmware 20.12 predates modern cybersecurity standards.

No CIP Security: v20.12 does not support encrypted CIP connections.
No User Accounts: Controller-level security is limited to simple passwords (easily bypassed).
No Audit Logs.

Mitigation: If you must use 20.12 in a connected environment:

Place controllers behind a Stratix 5700 or 5400 firewall.
Use a NAT router to hide the controller IPs.
Disable the "Web Server" and "Unconnected Messaging" in the controller properties.

Best Practices for Managing a Fleet at v20.12

If you are maintaining tens or hundreds of controllers on v20.12, follow these enterprise-level strategies:

Lock the Firmware: In your project security, enforce that the controller cannot be flashed to a different major revision without a manager’s password.
Standardize on 20.12: Do not allow mixed v20.01, v20.03, and v20.12 in the same plant. Standardize entirely on 20.12 for all v20 assets. The minor differences in instruction execution can cause side-effects.
VM Image Gold Copy: Create a Virtual Machine (VMware or Hyper-V) snapshot of Windows with RSLogix 5000 v20.12 perfectly installed. Modern Windows 10/11 updates often break older Rockwell software. A VM ensures you can always open a 20.12 file.
Avoid Windows 11: RSLogix 5000 v20.12 was never certified for Windows 11. It runs poorly on Windows 10 (with compatibility mode). Ideally, use Windows 7 SP1 or Windows 10 LTSC 2019.

9. Example Use Cases