2 Fundamentals of Programming 05.91
2.2 Block format
2.2 Block format
A block contains all data required to execute a working step. The block comprises several
words and the ”
L
F
” character for “end of block”.
The block length is max. 120 characters. The block is displayed in its entirety over several
lines.
Block structure: Format of a block
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Word
Block
WordBlock number Word End of block
The block number is entered under address N or with “:”. Block numbers are freely select-
able. A defined block search and defined jump functions are possible only if a block number is
used no more than once in a program.
Programming without a block number is permissible. In this case however, no block search or
jump functions will be possible.
The block format should be made as simple as possible by arranging the words of a block in
the program key sequence.
Block example:
N9235 G . . . X . . . Y . . . Z . . . F . . . S . . . T . . . M . . . H . . .
L
F
N Address of block number
9235 Block number
G . . Preparatory function
X . . . Y . . . Z . . . Position data
F . . . Feedrate
S . . . Spindle speed
T . . . Tool number
M . . . Miscellaneous function
H . . . Auxiliary function
L
F
End of block
Each block must be terminated with the “L
F
” end-of-block character. This character appears
on the screen as the special character L
F
. When the program is printed out, this character
does not appear.
If an address character is programmed more than once, the address character programmed
last is valid.
2–2
© Siemens AG 1991 All Rights Reserved 6ZB5 410-0HD02
SINUMERIK 880, (PG)
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