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Access the SIEMENS control and navigate to Diagnostics > System Information > Software Options to verify if 'Contour Handwheel' option is listed and enabled.

If the option does not appear, contact SIEMENS support with your control serial number for license activation.

Confirm the commissioning file (*.com or *.ccf) includes the contour handwheel option activation. Review machine documentation from initial setup.

If the option was recently purchased, reboot the control to ensure all license keys are reloaded by the NCK and PLC.

In SINUMERIK 840D, navigate to Parameters > Machine Data and search for handwheel-related MD entries (typically MD20xxx series for channel-specific settings). Verify MD20110 (handwheel enable) and related contour handwheel MDs are set to value 1 or appropriate axis specification.

Check the PLC source code for the signal that triggers contour handwheel activation. Locate the FC/FB block and verify it reads machine data flags before issuing the handwheel request to the NCK.

Load the correct commissioning configuration file or re-run machine data initialization to set handwheel-related parameters to factory defaults for your SINUMERIK model variant.

Open the active NC program in the SINUMERIK editor (Program > Edit or via Automatic mode screen). Search for FD= commands related to handwheel or contour functions throughout the program.

If FD=0 (disable) or removal of the handwheel command is acceptable, edit and save the program. If the handwheel function is required, ensure the option is licensed (see Cause 1).

Test program edits in single-block mode before resuming automatic cycle.

Verify the program syntax by using the SINUMERIK program check function (Automatic > Program Check or equivalent) to confirm no further FD-related handwheel calls exist downstream in the NC code.