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Press the ALARM soft key and note the exact channel number referenced in the %1 parameter to identify which channel triggered the alarm.

Review the NC program block where execution stopped. Check for syntax errors, missing parameters, or invalid G-code combinations in that specific channel's program.

Verify the program against SINUMERIK 840D SW 3.x programming guidelines, paying attention to deprecated commands or version-specific limitations.

Correct the program error, reset the alarm using the CANCEL ALARM key, and restart program execution from a safe position.

Always verify machine position and workpiece setup before restarting after alarm correction.

Access the HMI and navigate to Commissioning > Machine Data to review channel-specific settings for the affected channel number shown in the alarm.

Only qualified personnel should modify machine data. Document original settings before any changes.

Check machine data MD20110 (Channel axis assignments) and MD20070 (Number of channels) to verify correct channel configuration for your machine setup.

Review the NC program for commands that attempt to use axes or functions not assigned to the specific channel, particularly in multi-channel applications.

Correct channel assignments or modify the program to use only resources available to that channel, then perform a power cycle (NCK reset) to activate changes.

A complete NCK reset will clear all active programs and offsets. Save critical data before proceeding.

Check the current software version by navigating to HMI > Diagnostics > Version. Document the exact NCK software version installed.

Verify that the NC program was created for compatibility with SW 3.x or earlier. Check program header comments or creation date against software upgrade history.

If a software update was recently performed, review the Siemens upgrade documentation for alarm code changes and migration notes specific to version 3.x transitions.

Contact Siemens support with the exact software version and alarm details, as this legacy alarm may require version-specific remediation or program adaptation for current software.

Consider planning a software upgrade to current versions, as SW 3.x is obsolete and unsupported for modern applications.