Siemens Sinumerik 840D sl Programming Manual page 345

M function
M17*
M19
M30*
M40
M41
M42
M43
M44
M45
M70
Note
Extended address notation cannot be used for the functions marked with *.
The functions M0, M1, M2, M17 and M30 are always triggered after the traversing movement.
M functions defined by the machine manufacturer
All free M function numbers can be used by the machine manufacturer, e.g. for switching
functions to control the clamping devices or for the activation/deactivation of further machine
functions.
Note
The functions assigned to the free M function numbers are machine-specific. A certain M
function can therefore have a different functionality on another machine.
Refer to the machine manufacturer's specifications for the M functions available on a machine
and their functions.
Examples
Example 1: Maximum number of M functions in the block
Program code
N10 S...
N20 X... M3
N180 M789 M1767 M100 M102
M376
Fundamentals
Programming Manual, 01/2015, 6FC5398-1BP40-5BA2
Meaning
End of subprogram
Spindle positioning
End of program, main program (as M2)
Automatic gear change
Gear stage 1
Gear stage 2
Gear stage 3
Gear stage 4
Gear stage 5
Spindle is switched to axis mode
Comment
; M function in the block with axis movement,
; spindle accelerates prior to X axis movement.
; Maximum of five M functions in the block.
Auxiliary function outputs
14.1 M functions
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