HEIDENHAIN TNC 640 (34059x-01) ISO programming - Manual (Page 228)

228 Programming: Q Parameters
8.5 If-Then Decisions with Q
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8.5 If-Then Decisions with
Q Parameters
Application
The TNC can make logical If-Then decisions by comparing a
Q parameter with another Q parameter or with a numerical value. If
the condition is fulfilled, the TNC continues the program at the label
that is programmed after the condition (for information on labels, see
"Labeling Subprograms and Program Section Repeats", page 204). If it
is not fulfilled, the TNC continues with the next block.
To call another program as a subprogram, enter a % program call after
the block with the target label.
Unconditional jumps
An unconditional jump is programmed by entering a conditional jump
whose condition is always true. Example:
D09 P01 +10 P02 +10 P03 1 *
Programming If-Then decisions
Press the JUMP soft key to call the If-Then conditions. The TNC then
displays the following soft keys:
Function Soft key
D09 : IF EQUAL, JUMP
Example: D09 P01 +Q1 P02 +Q3 P03 "SPCAN25" *
If the two values or parameters are equal, jump to the
given label.
D10 : IF UNEQUAL, JUMP
Example: D10 P01 +10 P02 -Q5 P03 10 *
If the two values or parameters are unequal, jump to
the given label.
D11 : IF GREATER, JUMP
Example: D11 P01 +Q1 P02 +10 P03 5 *
If the first value or parameter is greater than the
second, jump to the given label.
D12 : IF LESS, JUMP
Example: D12 P01 +Q5 P02 +0 P03 "ANYNAME" *
If the first value or parameter is less than the second,
jump to the given label.