Siemens SINUMERIK 840D sl Programming Manual page 383

Further information about the predefined M commands
Programmed stop: M0
The machining is stopped in the NC block with M0. You can now remove chips, remeasure,
etc.
Programmed stop 1 - optional stop: M1
M1 can be set via:
• HMI / dialog box "Program Control"
or
• NC/PLC interface
The program execution of the NC is stopped by the programmed blocks.
Programmed stop 2 - an auxiliary function associated with M1 with stop in the program
execution
Programmed stop 2 can be set via the HMI / dialog box "Program Control" and allows the
technological sequences to be interrupted at any time at the end of the part to be machined.
In this way, the operator can interrupt the production, e.g. to remove chip flows.
End of program: M2, M17, M30
A program is terminated with M2, M17 or M30 and reset to the start of the program. If the main
program is called from another program (as subroutine), M2/M30 has the same effect as M17
and vice versa, i.e. M17 has the same effect in the main program as M2/M30.
Spindle functions: M3, M4, M5, M19, M70
The extended address notation with specification of the spindle number applies for all
spindles.
Example:
Program code
M2=3
If an address extension has not been programmed, the function applies for the master
spindle.
Fundamentals
Programming Manual, 09/2011, 6FC5398-1BP40-2BA0
Comment
; Clockwise spindle rotation for the second spindle
Auxiliary function outputs
13.1 M functions
383