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Check program execution status

Switch to Program Run (Full Sequence or Single Block) mode and observe the status bar. Look for 'INTERRUPTED', 'STOPPED', or 'WAITING' indicators. Press the STOP button to ensure program execution is fully halted.

The status bar at the bottom of the screen shows exact program state - 'Program aborted' indicates clean stop, while 'Program interrupted' will block shutdown.

Terminate program properly

If program is interrupted or waiting, either continue execution to reach M02/M30, or press the PGM MGT key and select 'Cancel program' to force termination. Ensure the program counter resets to beginning or shows 'Program ended'.

Forcing program cancellation may lose current workpiece coordinate offsets if not saved in preset table.

Reset NC kernel

If program state remains unclear, select Manual mode, then press the END key or perform an emergency stop reset. This forces the NC kernel to idle state and clears any pending program execution.

After manual reset, check the position display to verify REF status is maintained on all axes before attempting shutdown again.

Verify axis enable status

Check the position display screen - enabled axes show green highlighting or specific enable indicators. In Manual mode, observe whether axis position values are shown in bold or with enable symbols adjacent to axis names.

On iTNC 530 and TNC 620/640, the axis enable state is shown with a small green LED symbol next to each axis in the position display.

Disable axis controllers

Press the STOP button twice or use the axis enable toggle (typically CE + axis direction key combination) to deactivate all servo loops. Verify all axes show disabled state in position display.

Disabling axes on vertical (Z) axis machines may cause axis drop if brake delays are incorrectly configured in MP1511.

Check MP7430 automatic disable settings

Access MOD > Machine Parameters, navigate to MP7430.x series. Verify MP7430.0 (automatic axis disable) is set correctly for your shutdown sequence. Value should typically be 1 for automatic disable on program end.

MP7430.1 controls delay time before automatic disable - if set too short, it may create conflicts with PLC shutdown sequences.

Access PLC diagnostic markers

Press MOD key, select 'PLC' > 'Status PLC' > 'Marker display'. Look for markers in the M4xxx or M6xxx range that typically control shutdown enable. Common markers include M4096-M4127 for machine conditions.

Machine builders often use M4100-M4110 range for shutdown prerequisites. Document which markers control automatic shutdown during commissioning.

Review active PLC program logic

In PLC Status screen, check 'Active symbols' or use the search function to find shutdown-related logic. Look for comments containing 'AUTO OFF', 'SHUTDOWN', or 'POWER DOWN' in the PLC source code if accessible.

Do not force PLC markers unless you fully understand the safety implications - shutdown interlocks exist for machine protection.

Check machine condition prerequisites

Verify all machine doors are closed, coolant is off, spindle is stopped, and tool changer is in home position. These are typical prerequisites that PLC logic checks before authorizing automatic shutdown.

Use the PLC live display (MOD > PLC > Inputs/Outputs) to monitor real-time I/O states and identify which physical condition is blocking shutdown.

Review M02/M30 PLC handling

Access the PLC program section that handles M02/M30 auxiliary functions. These program end M-codes should trigger shutdown authorization. Verify the PLC logic properly processes these M-functions and sets the appropriate authorization markers.

On TNC 640 and later, use MOD > PLC > Trace function to monitor marker state changes in real-time when executing M02/M30.