Siemens SINUMERIK 828D Programming Manual page 40

Fundamental Principles of NC Programming
2.2 Structure and contents of an NC program
Block length
A block can contain a maximum of 512 characters (including the comment and end-of-block
character "L
Note
Three blocks of up to 66 characters each are normally displayed in the current block display
on the screen. Comments are also displayed. Messages are displayed in a separate
message window.
Order of the statements
In order to keep the block structure as clear as possible, the statements in a block should be
arranged in the following order:
N... G... X... Y... Z... F... S... T... D... M... H...
Address
N
G
X,Y,Z
F
S
T
D
M
H
Note
Certain addresses can be used repeatedly within a block, e.g.
,
G...
40
").
F
Meaning
Address of block number
Preparatory function
Positional data
Feed
Spindle speed
Tool
Tool offset number
Additional function
Auxiliary function
,
M... H...
Programming Manual, 07/2010, 6FC5398-1BP40-0BA0
Fundamentals