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subprogram return

This is action in a CNC program requests that the subprogram return to the main program. It is usally coded as an M99

N300 M98 P7001 (tells the main program to jump to propgram O7001)

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O7001 (SUBPROGRAM)
N010...
N020...
N030 M99 (tells the subprogram to go back to the main program and continue)
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