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Check the channel status display to identify any active auxiliary functions (M, S, T commands) or coupled axis operations that may still be executing.

Execute a controlled feedhold (feed stop) followed by a program stop before attempting the reset operation again.

If coupled axes or gantry configurations are active, verify synchronization status in the axis diagnostics and manually decouple if necessary using machine function panel.

Manually decoupling synchronized axes may cause position offsets; perform reference point approach afterward.

Perform a complete NCK reset using the control panel (NC-Start mode) to clear all channel states, then re-reference all axes before resuming operation.

Access PLC diagnostics and check for active interface signals between NC and PLC, particularly reset acknowledgment signals (DB19/DB21 interface variables).

Review PLC program (OB1 and interrupt blocks) for reset handling logic and verify that acknowledgment signals are being properly set within required cycle times.

Monitor PLC cycle time in diagnostics; if cycle time exceeds 50-100ms, optimize PLC program or identify blocking functions causing delays.

Perform a complete PLC stop and restart, followed by an NCK reset to re-establish clean communication handshake between systems.

PLC restart will deactivate all machine safety circuits; ensure machine is in safe state before proceeding.

Access NCK diagnostics (Service Display) and review the active task list and system buffer for any error entries or stuck processes related to the affected channel.

Check for any pending asynchronous subroutines (ASUP), interrupt routines, or synchronous actions that may not have completed properly using the program status display.

Perform a power-off reset: shut down the control completely, wait 30 seconds for capacitor discharge, then power up and allow full system initialization.

Power cycle will clear all temporary data and work offsets; document current settings before proceeding.

If alarm persists after power cycle, boot the system into failsafe mode and perform NCK data consistency check using commissioning functions, then reload machine data if corruption is detected.

Reloading machine data requires backup files and may necessitate complete re-commissioning; contact Siemens service if uncertain.