Siemens SINUMERIK 840D sl Programming Manual page 44

Fundamentals
2.2 Fundamental Principles of NC Programming
The address character (generally a letter) defines the meaning of the command.
Examples:
Address character
G
X
S
Digit sequence
The digit sequence is the value assigned to the address character. The sequence of digits can
contain a sign and decimal point. The sign always appears between the address letter and the
sequence of digits. Positive signs (+) and leading zeros (0) do not have to be specified.
Elements of the NC high-level language
As the command set according to DIN 66025 is no longer adequate for programming complex
machining sequences in modern machine tools, it has been extended by the elements of the
NC high-level language.
44
Meaning
G command (preparatory function)
Position data for the X axis
Spindle speed
Programming Manual, 12/2019, 6FC5398-2EP40-0BA0
NC programming