GROUPERR_FIFO_INVALIDDIMENSION

What does 42ED mean?

The FIFO dimension (number of axes) configured for the group is invalid, falling outside the supported range of [1 ... 8] or [1 ... 16] (depending on the TwinCAT version, with newer builds supporting up to 16 axes). This mismatch prevents the FIFO buffer from correctly managing motion commands for the intended number of axes in the group.

• Attempting to configure an NC group with zero axes or more axes than the maximum supported FIFO dimension (8 or 16 depending on TwinCAT version).
• Manual configuration error where the number of axes assigned to the FIFO group in the System Manager is incorrect.
• Automated generation of group configuration via a template that exceeds the FIFO dimension limits for the current TwinCAT version.
• Software update changing the supported FIFO dimension range without a corresponding adjustment in the existing configuration.
• Memory allocation failure during group initialization, preventing the system from correctly recognizing the FIFO dimension.

Click steps to track your progress.

1. 1

   1. Access the NC configuration in the development software (e.g., TwinCAT XAE).

2. 2

   2. Verify the number of axes currently assigned to the FIFO group under the group's properties.

3. 3

   3. Adjust the number of axes within the FIFO group to be between 1 and 8 (or 16 for newer TwinCAT 3.x builds) as supported.

4. 4

   4. Save the modified configuration and activate it on the controller.

5. 5

   5. Perform an NC reset or controller reboot to ensure the new FIFO dimension is recognized by the runtime.