H Functions - Siemens SINUMERIK 840DE Programming Manual

End of program, M2, M17, M30
A program is terminated with M2, M17 or M30 and reset to the beginning of the program. If
the main program is called from another program (as a subprogram), 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 spindle number is used for all spindle functions.
Example: M2=3 means CW spindle rotation for the second spindle. If no address extension
is programmed, the function applies to the master spindle.
9.1.2

H functions

Function
H functions are used to transfer information to the PLC (programmable logic controller), in
order to activate specific switching operations. H functions are REAL values.
Up to three H functions can be programmed in one NC block.
Machine manufacturer
The meaning of the functions is determined by the manufacturer.
Programming
N10 G0 X20 Y50 H3=–11.3
Fundamentals
Programming Manual, 10.2004 Edition, 6FC5 298-7AB00-0BP1
Special functions
9.1 Auxiliary function outputs
9-7