Structure And Contents Of An Nc Program; Blocks And Block Components - Siemens SINUMERIK 828D Programming Manual

2.2

Structure and contents of an NC program

2.2.1

Blocks and block components

Blocks
An NC program consists of a sequence of NC blocks. Each block contains the data for the
execution of a step in the workpiece machining.
Block components
NC blocks consist of the following components:
● Commands (statements) according to DIN 66025
● Elements of the NC high-level language
Commands according to DIN 66025
The commands according to DIN 66025 consist of an address character and a digit or
sequence of digits representing an arithmetic value.
Address character (address)
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 zeroes (0) do not have to be
specified.
Fundamentals
Programming Manual, 07/2010, 6FC5398-1BP40-0BA0
Meaning
G function (preparatory function)
Position data for the X axis
Spindle speed
Fundamental Principles of NC Programming
2.2 Structure and contents of an NC program
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