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Navigate to Diagnostics > Machine Data > MD20050 (SpindleAssignToChannel) and verify the spindle number matches an active spindle axis in your configuration (typically spindle 1 for primary threading operations).

Check MD20051 (SpindleType) is set to 1 (main spindle) not 0 (sub-spindle). Verify MD20055 (SpindleNumberOfSpindles) reflects the correct spindle count.

Incorrect spindle type assignment will prevent F_TFS cycle execution.

Confirm the assigned spindle axis exists in the axis configuration (NCK menu: Machine Data > Axes/Spindles) and that the spindle motor encoder/feedback path (feedback module assignment MD31010-MD31020 range) is active.

Download updated machine data to the control via Commissioning > Download MachineData and cycle power to the NCK.

Review the NC program block sequence. Ensure M3 or M4 (spindle on CW/CCW) and S-word (spindle speed) are programmed at least one block before the F_TFS call.

F_TFS requires spindle rotation at speed; static spindle will not satisfy the master spindle requirement.

Verify spindle enable logic in the PLC program (typically in the motion prepare section). Check if there is a conditional gate preventing spindle start before cycle execution.

In Manual/JOG mode, manually start the spindle (Spindle ON button) and set a valid speed before attempting F_TFS function test.

Monitor spindle actual speed in Diagnostics > Actual Values > Spindle/Axis (verify non-zero RPM feedback) before invoking the cycle.

Check Diagnostics > Alarms for any preceding spindle encoder errors (alarm codes 1xxxx range spindle feedback faults). Note the specific encoder channel/module.

Verify feedback module assignment in Machine Data: MD31010 (FeedbackModule for axis/spindle) and MD31050 (EncoderType) match physical hardware. Confirm encoder wiring and connector integrity at the control terminal block.

Loose encoder connectors or misconfigured feedback module indices are common causes of spindle-not-ready conditions.

Monitor Diagnostics > Actual Values > Spindle to confirm encoder counts are incrementing when spindle is manually rotated. If counts remain zero, the feedback signal is not reaching the NCK.

If encoder fault persists, perform a hardware reset: power cycle the drive module (via Safety PLC or main contactor) and verify encoder LED status on feedback module before restarting the control.