While v20.12 is stable, Rockwell Automation has moved to the Studio 5000 environment, making v20 a legacy platform.
If you need to add new modules (like modern Stratix switches or newer servo drives), you will likely be forced to upgrade past v20.12, as new hardware Add-On Profiles rarely support firmware this old. rslogix 5000 firmware 20.12
When using Produced/Consumed tags over a backbone with 20.12 and a 1756-EN2TR bridge, you may experience a 1-second CPU spike on connection loss. Workaround: Set RPI to non-multiples of 2 ms (e.g., 5 ms instead of 4 ms). While v20
You might wonder, "Why not just upgrade to the latest firmware (V32, V33, or V34)?" In a perfect world, you would. But industrial automation is rarely a greenfield project. Here is why 20.12 remains a workhorse in the industry. If you need to add new modules (like