Question / Problem
Why am i having trouble with OPC Server for Allen Bradley PLC's communicating with ControlLogix PLC family with Firmware 20.019 or 20.057?
Answer / Solution
Firmware V20 is known to have issues. We recommend not using it. You can:
- Upgrade the Device Firmware - This is best path forward if the application requires use of Logical Protocol Mode for performance optimization. In this case, update the controller to firmware V21 or higher. Device firmware compatibility and update instructions can be found on the Rockwell Automation Technical Support site.
- Downgrade the Device Firmware - This is best path forward if the application requires use of Logical Protocol Mode for performance optimization, but the device does not support a firmware revision beyond V20. In this case, update the controller to firmware V20.018 (20.055 for redundant CPU) or lower. Device firmware compatibility and update instructions can be found on the Rockwell Automation Technical Support site.
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