Value Assignments - Siemens SINUMERIK 840D sl Programming Manual

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 LF).
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..., M..., H...
2.2.3

Value assignments

Values can be assigned to the addresses. The following rules apply:
• An "=" sign must be inserted between the address and the value if:
-
-
The "="-sign can be omitted if the address is a single letter and the value consists of only
one constant.
• Signs are permitted.
• Separators are permitted after the address letter.
38
Significance
Address of block number
Preparatory function
Positional data
Feed
Spindle speed
Tool
Tool offset number
Additional function
Auxiliary function
The address comprises more than one letter
The value includes more than one constant.
Programming Manual, 09/2011, 6FC5398-1BP40-2BA0
Fundamentals