HEIDENHAIN TNC 306 Technical Manual - Manual (Page 198)

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TNC 406/TNC 306 7 M-functions 2/97
7.2 Program-halt on M-functions
Normally, when an M-function is produced, the program run in the operating modes "Program
run/full sequence" and "Program run/single block" is interrupted until the PLC acknowledges that the
M-function has been performed.
In some applications the program should be executed continuously and not wait for the
acknowledgment of the M-function. This function can be selected by machine parameter MP7440,
Bit 2.
If this function is selected then PLC-positioning, datum-correction, or limit switch range-change are
all not permitted during the output of the M-function.