Here is the part that trips up even experienced engineers: You cannot always flash straight to v20.12.
Rockwell identified a security vulnerability and a need for a more robust bootloader. Consequently, if you have a controller running older firmware (like v20.01 or earlier), you often cannot flash it directly to v20.12 using ControlFLASH.
Instead, you typically had to follow a two-step process:
This process caused headaches for many engineers trying to update controllers in the field. Missing this step often resulted in flashing errors, leaving engineers scratching their heads wondering why the "latest" firmware wouldn't take.
Firmware: 20.12
Software: RSLogix 5000 v20.01 – 20.06
Flash Utility: ControlFLASH 14+
Max Controller: 1756-L75 (ControlLogix) / 1769-L36ERM (CompactLogix)
Safety: GuardLogix 5570 (L6S, L7S)
Motion: Kinetix 5500, 5700, Ultra 3000 (SERCOS)
Language: Ladder, FBD, ST, SFC
File Extension: .ACD (RSLogix 5000 format, not Studio 5000)
RSLogix 5000 firmware 20.12 (listed as 20.012 in the PCDC) is a maintenance release for ControlLogix and CompactLogix controllers that resolves specific hardware anomalies and ensures compatibility with version 20 software. The firmware supports various legacy hardware, including CompactLogix L3x/L2x and 1756-L6x controllers, and requires a two-step upgrade process for older revisions. For detailed release notes on specific hardware, visit Rockwell Automation Literature.
RSLogix 5000 version 20 is a unique and critical major release in the Rockwell Automation lifecycle, as it is the final major version to carry the RSLogix 5000 name before the platform evolved into Studio 5000 Logix Designer at version 21.
While the user query specifically mentions "20.12," it is important to distinguish between software minor revisions (e.g., v20.04, v20.05) and firmware revisions (e.g., 20.012). Firmware version 20.012 was a specific release for controllers like the CompactLogix L35E to provide security enhancements. Core Version Analysis: The v20 "Resiliency" Split
Version 20 is known for a major compatibility break that occurred between minor revisions, which significantly impacts how you manage firmware and software.
v20.01 (Original): The initial release. It is incompatible with v20.03.
v20.03 (Enhanced Resilience): A rapid-response security patch for the communication stack. It introduced "binary-incompatibility," meaning v20.03 software could only talk to v20.03 firmware. Opening a project in v20.03 permanently converts it, preventing older v20 versions from opening it.
v20.04 and Higher (Restored Compatibility): Revisions 20.04, 20.05, and 20.06 were released to fix this split. These versions can open and go online with projects from both 20.01 and 20.03. Technical Specifications & Requirements
For effective use of v20 software on modern systems, the following requirements apply: rslogix 5000 firmware 20.12
If you must keep 20.12:
For engineers who prefer the classic look and feel of RSLogix 5000 (without the extra bloat of Studio 5000’s integrated tools), 20.12 is the final destination. It provides all the power of ControlLogix without forcing the user into the newer, more resource-intensive IDE.
Use firmware 20.12 only if you have existing v20 projects and need the bug fixes or hardware support (e.g., newer EN2T series D).
Otherwise stay on 20.011 (if stable) or upgrade to Studio 5000 v32+ for new development.
Always match RSLogix 5000 v20.01.00 (CPR 9 SR 5) or higher with controller 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
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 Here is the part that trips up even
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.
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.
You can use this for a knowledge base article, a safety alert, a training memo, or a blog post.
RSLogix 5000 Firmware 20.12 is more than just a software update—it is a strategic tool. For plants running mixed fleets of old and new hardware, for engineers who despise the ribbon interface of Studio 5000, and for integrators who need rock-solid Windows 10 compatibility, 20.12 is the answer.
However, treat it with respect. Always maintain recovery media. Always verify redundancy compatibility. And most importantly, have a documented roadmap for the eventual migration to Studio 5000.
Today, 20.12 is the bridge. Tomorrow, it will be the legacy. But for now, it remains the gold standard for stable, mid-life Logix controllers.
Need to check your current firmware? Open RSLinx Classic, right-click your controller, select "Device Properties," and look for the "Revision" field. If it doesn't say 20.12—and you're experiencing stability issues—it's time to update.
RSLogix 5000 Firmware Revision 20.012 (released in June 2012) is a specific firmware update for the Logix5000 family of controllers, notably supporting the CompactLogix L3x Rockwell Automation A critical distinction for this version is that while the is revision 20.012, there is no matching This process caused headaches for many engineers trying
version 20.12. Users typically use RSLogix 5000 software version 20.01 or 20.03 to communicate with controllers running this firmware. The Automation Blog Core Technical Specifications Release Date: June 2012. Primary Purpose:
Ongoing security enhancements and maintenance of established Logix5000 hardware. Controller Compatibility: Supported hardware includes: CompactLogix: 1769-L23x, 1769-L31, 1769-L32x, 1769-L35x. ControlLogix: 1768-L43, 1768-L43S, 1768-L45, 1768-L45S. Rockwell Automation Key Improvements and Fixed Issues
This revision includes specific security enhancements to protect industrial control systems against vulnerabilities. Safe State Correction:
Earlier issues where "Safe State Values" did not function correctly for specific modules (like 1794-IE4XOE2 and 1794-OE12) were addressed, though full correction often required a corresponding software update to version 20.01. Redundancy Support:
Version 20 generally supports redundancy, but requires a separate, specific firmware revision for hardware in a redundant chassis. Rockwell Automation Operational Constraints & Known Anomalies Software Version Mismatch:
You cannot find "RSLogix 5000 v20.12" software. Version 20.01 or 20.03 are the compatible programming environments. Transition Failures:
noted that controllers running v20.012 might fail to transition to when used with certain PowerFlex 520 or 750 series drives. Upgrade Path:
If upgrading from v11 or earlier, you must first upgrade to revision 12 or 13 before jumping to revision 20.xx. Rockwell Automation System Requirements (Software Version 20)
To effectively use the software required to manage v20.012 firmware, the following PC requirements typically apply: Operating System:
Windows 7, Windows Vista, or Windows XP. Note that later minor versions (like 20.06) added Windows 10 support. Processor: Pentium 4 (2.4 GHz minimum). 1 GB minimum (8 GB recommended for performance). 16 GB to 20 GB of free hard disk space. Rockwell Automation For detailed documentation, refer to the
Rockwell Automation Product Compatibility & Download Center (PCDC)
to find specific release notes for your hardware catalog number. Rockwell Automation ( 9324-RLDx ) RSLogix 5000 programming ... - Release Note