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Press RESET to clear the alarm and cancel the current program stop attempt.

Return machine to a known safe position using JOG mode, then select program start position manually.

Ensure all axes are clear of obstructions and workpiece before jogging

Avoid using block search function; instead restart program from beginning or use approach positioning with manual offsets.

If block search is required, perform a complete NC Start/Stop cycle test without axes movement to verify synchronization before machining.

Clear alarm with RESET, then check HMI diagnostics to identify which channel in the mode group reported the error.

Review the NC program for WAITM or WAITMC synchronization commands between channels; ensure proper synchronization points exist before stop commands.

Execute each channel independently in single channel mode to isolate which channel is causing the synchronization issue.

If problem persists, back up NC data and perform a power cycle (cold restart) of the NCU to reset all mode group states, then reload and re-reference axes.

Document current tool offsets and work offsets before power cycle

Document the exact NC program sequence and mode group configuration active when alarm occurred, including feed rates and active G-codes.

Check current NCK software version in HMI Commissioning area; if running SW 3.x or earlier, plan upgrade to SW 4.x or later where this alarm is obsolete.

Review machine data MD28020 (mode group assignment) and MD28030 (channel assignment) for correct configuration; verify no overlapping channel assignments.

Incorrect machine data modification can cause severe machine malfunction - document original values

Contact Siemens support with alarm log, software version, and NC program excerpt to obtain software patch or workaround specific to your configuration.