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Kepware Knowledge Base: Solution


Allen-Bradley ControlLogix Logical Protocol Modes Not Compatible with Firmware 20.19 or 20.57


Last Update: 2018/11/12
Problem

The Allen Bradley ControlLogix Ethernet driver cannot communicate with controllers running firmware 20.19 or 20.57 (redundant CPU) when the Protocol Mode in Device Properties | Logix Options is set to Logical Blocking and Logical Non-Blocking. When the server attempts to update tags the controller responds with a CIP 0x0F Permission Denied error.
Note: The event log message is a custom version of "Allen-Bradley ControlLogix Ethernet <Channel Name>.<Device Name> | Unable to read tag. | Tag address = '<Tag Name>', CIP error = 0XF, Extended error = 0000."

Solutions
  • Use Symbolic Protocol Mode - Using Symbolic Protocol Mode is the easiest resolution if applicable. Symbolic protocol is best for applications where there is not a high tag volume and/or quick updates are not required. Refer to the Performance optimization section of the Allen Bradley ControlLogix Ethernet driver help file for guidance.
  • 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 V20.18 (20.55 for redundant CPU) or lower. Device firmware compatibility and update instructions can be found on the Rockwell Automation Technical Support site.
Related Products
Allen-Bradley Suite