CNC machine stops for dwell period (may be X, U, or P).
The dwell period is specified by a control parameter (may be X, U, or P) which determines the time unit (seconds, milliseconds, etc.), typically X and U set to milliseconds, P sets seconds.
G04 command is non-modal.
Example for CNC G04 command:
G04 P10 ; Ten-second pause
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