103004

Check the NC display to verify current program status - look for ACTIVE, INTERRUPTED, or STOP indicators in the channel state bar.

If program is running or paused, press NC STOP to halt execution completely. Wait for channel status to show RESET or IDLE.

Press RESET button on the machine control panel to clear the channel and reset the NC kernel to idle state.

Ensure all axes are in a safe position before issuing NC RESET as it will cancel all active movements.

Verify channel status shows RESET, then re-attempt the block search operation from the desired program line.

Monitor all axis displays and ensure no ACTUAL POSITION values are changing, indicating movement completion.

Check for active M-functions or auxiliary commands (spindle, coolant, tool change) that may not have completed their execution cycle.

Execute a controlled NC RESET to clear the interpolation buffer and terminate all pending axis and auxiliary commands.

Verify that any active auxiliary functions (spindle rotation, coolant) are safely terminated before proceeding.

Allow 2-3 seconds after RESET for all servo drives and channel logic to fully settle before initiating block search.

Access Service/Diagnostic screen and check for active ASUB (asynchronous subroutines) or interrupt routines in the channel display.

Review PLC status and verify no FC18/FB1 interlocks are holding the channel in a locked state via DB21.DBX1.0 or similar enable signals.

Issue a full NC RESET followed by power cycle of the NC kernel (Mode selector to POWER OFF, wait 10 seconds, return to AUTO) if persistent.

Coordinate with production supervisor before cycling NC power. Document machine position if critical for job setup.

After restart, verify channel shows clean RESET state in diagnostics before attempting block search. Contact Siemens support if alarm persists after power cycle.