Rslogix 5000 Firmware 20.12 2021 Page

The discussion surrounding RSLogix 5000 firmware version 20.12

6. Installation Steps (Firmware Flashing)

Prerequisites

• ControlFLASH (v12.00 or later, included with RSLogix 5000 v20 installation)
• RSLogix 5000 v20.01.00 installed
• PC with Ethernet or serial connection to controller
• Controller in Program mode (optional but recommended)
• Backup controller program (.ACD file)

• Targets several CompactLogix/ControlLogix catalog numbers (examples: 1769-L31/L32/L35E series, some 1768/1756 family models); compatibility varies by specific module and series — always confirm against Rockwell’s compatibility/download pages for exact catalog numbers.

C. Known Anomaly (Anomaly ID: 64852)

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). rslogix 5000 firmware 20.12

Download the Kit: Visit the Rockwell Automation Product Compatibility and Download Center (PCDC). You will need a valid serial number and a TechConnect contract. The discussion surrounding RSLogix 5000 firmware version 20

5. Recommendation for 2026

Do not deploy new projects on RSLogix 5000 v20.12 today. ControlFLASH (v12