Okuma Alarm D-4866 – No Workpiece

Okuma Alarm D-4866 indicates that the control detected a no-workpiece signal. This means the machine received an input signal showing that no workpiece is present in the expected position. The alarm is often related to the I/O input check signal and may be caused by a missing part, sensor issue, wiring problem, or incorrect signal status. The workpiece detection sensor and related input signals should be checked.