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Verify active channel count and spindle allocation in Diagnostics > Channels > Spindle Status. Confirm which channel currently owns the master spindle resource.

Do not attempt coupling operations simultaneously across channels.

Check MD10089 SPIND_COUPLE_MASTER_SPEED and MD10090 SPIND_COUPLE_RATIO on both channels. Ensure master spindle assignment is unique or explicitly managed via channel-specific spindle numbers.

Review part program logic: confirm coupling commands (COUP, COUPLE, or spindle G-code) are not issued simultaneously across multiple channels. Serialize spindle coupling via program sequence or channel synchronization commands.

If using conditional coupling logic, verify MD10091 SPIND_COUPLE_ENABLE is properly reset between channel transitions to release the master spindle resource.

Navigate to Diagnostics > PLC > Memory > check DBX addresses for spindle control (typically DB1 or application-specific DB). Identify any outstanding WRITE locks or uncleared RETAIN bits on spindle speed/mode registers.

Do not force-clear PLC memory without understanding program intent; coordinate with PLC programmer.

Examine PLC source code (OB1, cyclic functions) for spindle access blocks that lack explicit release logic. Look for missing CLR (clear) or RESET commands after spindle parameter modifications.

Verify PLC Program CycleTime (OB35) is not blocking: in Diagnostics > PLC > Cycle Time, confirm OB1 executes normally without timeout. A stalled PLC cycle can hold spindle resources indefinitely.

If PLC intentionally manages spindle, implement explicit handoff logic: set a PLC flag (e.g., 'SpindleReadyForNCK') and confirm NCK receives acknowledgment via system variable before issuing coupling command in part program.

Cross-reference alarm parameter %3 (master spindle/axis number) against configured spindle list in Diagnostics > Configuration > Spindles. Confirm the spindle exists and its axis assignment is valid.

Check MD55200 SPINDLE_ENABLE (or equivalent enable bitmap for multi-spindle systems). Verify the target spindle bit is set to 1 (enabled). If 0, spindle is disabled and unavailable for coupling.

Enabling a spindle may require PLC safety verification; confirm with machine builder before modification.

Validate MD10088 SPIND_COUPLE_TYPE value: confirm it is set to 1 (Speed coupling) or 2 (Position coupling). If 0 or undefined, coupling is disabled. Review machine manual for correct type for this application.

If spindle is motor-driven with servo axis, verify the servo axis is initialized and ready-to-operate: check Diagnostics > Axes > [axis name] for servo ready flag. A servo axis in FAULT or STANDBY state cannot serve as a master spindle.