HEIDENHAIN TNC 407 (280 580) ISO Programming - Manual (Page 183)

6-5 TNC 426/TNC 425/TNC 415 B/TNC 407
6 Subprograms and Program Section Repeats
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6.2 Program Section Repeats
Like subprograms, program section repeats are
identified with labels.
Operating sequence
The program is executed up to the end of the
labelled program section (
1 and 2 ), i.e. up to the
block with Ln,m.
Then the program section between the called label
and the label call is repeated the number of times
entered after under m (
3 , 4 ).
The program is then resumed after the last
repetition (
5 ).
Programming notes
• A program section can be repeated up to 65 534
times in succession.
• The total number of times the program section is
executed is always one more than the pro-
grammed number of repeats.
Fig. 6.2: Flow diagram for a program section repeat;
R = return jump
1
3
5
4 2
R R
% ... *
G98 L1 *
L1,2 *
N99999 % ... *
Programming and executing a program section repeat
Mark the beginning:
Select the label setting function.
LABEL NUMBER ?
Program section repeated starting at LABEL 7, for example.
Resulting NC block: G98 L7 *
Specify the number of repeats:
Enter the number of repeats in the block that calls the label. This is also
the block that ends the program section.
The program section from LABEL 7 up to this block will be repeated
ten times. This means it will be run a total of
eleven times.
Resulting NC block: L7,10 *
8
END 7
9 G
ENT
7 1 0 END L