After flashing from V19 to V20.12, you get a "Low Memory" warning even though the program didn't change. Cause: Version 20 stores some tag structures and add-on instruction (AOI) signatures differently. V20.12 is slightly more memory-efficient than early V20 builds, but stricter than V19. Fix: Analyze your memory usage via Controller Properties > Memory . Optimize array sizes and remove unused tags.
The "20" denotes the major version, while the ".12" indicates the minor revision or patch level. This version is the final build in the v20 series, which holds a unique place in Rockwell history. V20 was the last firmware version to be programmed exclusively with the legacy software interface. Starting with version 21, Rockwell transitioned to the Studio 5000 environment, which unified controller programming with view design (FactoryTalk View ME) and other engineering tools. rslogix 5000 firmware 20.12
You must have the RSLogix 5000 Professional or Standard edition installed that supports revision 20. Hardware Compatibility After flashing from V19 to V20
The discussion surrounding RSLogix 5000 firmware version 20.12 Fix: Analyze your memory usage via Controller Properties
Select the exact model number of your Logix controller.
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