Block Structure - Siemens sinumerik 802d sl Operation And Programming Manual

8.1.4

Block structure

Functionality
A block should contain all data required to execute a machining step.
Generally, a block consists of several words and is always completed with the end-of-block
character "L
feed key or the Input key.
Skip block;
only if necessary; stands in the beginning
Fig. 8-2
Word order
If there are several instructions in a block, the following order is recommended:
N... G... X... Z... F... S... T... D... M... H...
Note regarding block numbers
First select the block numbers in steps of 5 or 10. Thus, you can later insert blocks and nev-
ertheless observe the ascending order of block numbers.
Block skip
Blocks of a program, which are to be executed not with each program run, can be marked
by a slash / in front of the block number. The block skip operation itself is activated either via
operation (Program control: "SKP") or via the PLC (signal). A section can be skipped by
several blocks in succession using " / ".
If a block must be skipped during program execution, all program blocks marked with " / "
are not executed. All instructions contained in the blocks concerned will not be considered.
The program is continued with the next block without marking.
SINUMERIK 802D sl Operation and Programming Nibbling (BP-N), 06/2006 Edition
6FC5 398-3CP10-0BA0
" (LineFeed). This character is automatically generated when pressing the line
F
/N... Word1 Word2
Space Space
(BLANK)
Block instructions
Block number – stands in front of the instructions;
only if necessary; instead of "N", a colon
Colon (:)
Block structure diagram
8.1 Fundamental principles of NC programming
... Wordn
Space Space
" : "
Total number of characters in a block: 512 characters
Programming
;Comment
End-of-block
character
only when required;
is written at the end,
delimited from the
remaining part of the block
by " ; "
L
F
8-123