HEIDENHAIN SW 54843x-02 DIN Programming - Manual (Page 400)

400 DIN programming
4.32 Conditional bloc
k r
u
n WHILE..ENDWHILE program repeat
A program repeat consists of the elements:
 WHILE, followed by a condition. The condition includes a variable or
mathematical expression on either side of the relational operator.
 ENDWHILE concludes the conditional program repeat.
NC blocks programmed between WHILE and ENDWHILE are
executed repeatedly for as long as the condition is fulfilled. If the
condition is not fulfilled, the control continues execution of the
program with the block programmed after ENDWHILE.
Interrogate bitset: You can also use the BITSET function as
condition. The function returns 1 if the numerical value contains the
requested bit. The function returns 0 if the numerical value does not
contain the requested bit.
Syntax: BITSET (x,y)
 x: Bit number (0 to 15)
 y: Numerical value (0 to 65535)
The relationship between bit number and numerical value is shown in
the table at right. You can also use variables for x, y.
Programming:
 Select "Extras > DINplus word...". The control opens the "Insert DIN
PLUS word" selection list.
 Select WHILE.
 Enter the condition.
 Insert NC blocks between WHILE and ENDWHILE.
Relational operators
< Less than
<= Less than or equal to
<> Not equal to
> Greater than
>= Greater than or equal to
== Equal to
Combining conditions:
AND Logical AND operation
OR Logical OR operation
Bit
which means
numerical
value
Bit
which means
numerical
value
0 1 8 256
1 2 9 512
2 4 10 1024
3 8 11 2048
4 16 12 4096
5 32 13 8192
6 64 14 16384
7 128 15 32768
Example: WHILE..ENDWHILE
. . .
N.. WHILE (#l4<10) AND (#l5>=0)
N.. G0 Xi10
. . .
N.. ENDWHILE
. . .
 You can combine up to two conditions.
 If the condition you program in the WHILE command is
always true, the program remains in an endless loop.
This is one of the most frequent causes of error when
working with program repeats.