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Review the program line where the alarm occurs and identify the active synchronous mode (check for G96 constant surface speed, M19 spindle orientation, or G84/G74 rigid tapping).

Check if G50 (spindle speed limit or coordinate setting), G92 (coordinate system setting), or G96/G97 changes are commanded during active synchronization. Cancel synchronous mode before these commands.

Verify that spindle override or speed changes are not commanded during rigid tapping cycles. Use G80 to cancel the cycle before changing spindle parameters.

Restructure the program to cancel synchronous control (G97, G80, or M-code to release C-axis) before the prohibited command, then re-establish synchronization if needed.

Ensure tool position is safe before canceling synchronous modes, as this may affect tool path control.

Identify if synchronized spindle mode is active (check for G51.2 for polygon machining or M-codes for spindle synchronization in the active program block).

Check parameters 4600-4650 series for synchronous control settings and verify that the commanded operation is compatible with the current synchronization state.

Review if independent spindle commands (speed changes, orientation, or gear changes) are being sent to a spindle that is currently slaved or synchronized to another spindle.

Changing spindle relationships during active machining can cause crashes or workpiece damage.

Cancel spindle synchronization with the appropriate M-code (typically M23, M80, or G50.2 depending on machine configuration) before commanding independent spindle operations, then re-synchronize if required.

Check if M19 (spindle orientation) or C-axis control is active when the alarm occurs. Review the previous program blocks for C-axis positioning commands.

Verify that the program is not attempting to command M03/M04 (spindle start) or S-codes while the spindle is still in C-axis mode. Cancel C-axis mode first.

Insert the appropriate M-code to cancel C-axis mode (typically M05, M15, or machine-specific code) before commanding spindle rotation or speed changes.

Ensure the C-axis position is at a safe location before canceling positioning mode.

Review parameter 4000-4050 series for C-axis and spindle mode switching settings. Verify that proper dwell times or confirmation signals are programmed between mode changes.