: Version 20 is the final major release under the "RSLogix 5000" name; version 21 and later were rebranded as Studio 5000 Logix Designer .
A unique architectural quirk in Rockwell’s v20 release history requires careful management by automation professionals:
: In the Rockwell Product Compatibility and Download Center (PCDC) , this version is often listed as 20.012 . However, within the Controller Properties in RSLogix 5000, it typically appears as 20.12 . rslogix 5000 firmware 20.12
Choose the 20.12 version from the list.
With RSLogix 5000 effectively end‑of‑life, planning a migration to the current Studio 5000 platform is a prudent long‑term strategy. Here is a general approach for the migration path: : Version 20 is the final major release
In this post, we are taking a deep dive into Firmware 20.12. We’ll discuss why this specific point release matters, the headache of updating it, and why it remains a critical tool in the automation engineer's arsenal today.
| Software | Compatible Version(s) | | ------------------------------- | ----------------------------------------- | | | v20.01.00 (CPR 9 SR 5) or higher | | Studio 5000 Logix Designer | ❌ Not compatible (v21+ uses different FW) | | RSLinx Classic | v3.51 or higher (CPR 9) | | FactoryTalk View Studio | v6.10 or higher | | Windows OS (tested) | Win7 Pro, Win8.1, Win10 (up to 1809) | Choose the 20
| Issue | Solution | | ---------------------------------------- | ------------------------------------------------------------------------ | | “Firmware mismatch – need major 20” | Your project is v19 or v21 – must use matching RSLogix version. | | ControlFLASH doesn’t show 20.12 | Download the .dmk and install via . | | Cannot go online with v20.01 RSLogix | Update RSLogix 5000 to v20.01.00 (CPR 9 SR 5) – earlier builds lack 20.12 support. | | Windows 10 install fails | Run installer in Win7 compatibility + disable UAC. | | Major fault 7 (recursive ladder) after flash | Clear memory, download clean program. |
Many companies are choosing to freeze a specific Windows 10 Virtual Machine (VMware or Hyper-V) that contains RSLogix 5000 V20 and support for firmware 20.12. They run their modern engineering tools (Studio 5000 V35) on the host OS and spin up the VM only to service older lines.
⚠️ Firmware 20.12 is not compatible with Studio 5000. You must use RSLogix 5000 v20.01.00 (or later CPR 9 SR 5) .
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