HEIDENHAIN TNC 640, User Manual, Page: 376 / 948

Programming Q Parameters | Principle and overview of functions
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HEIDENHAIN | TNC 640 | Conversational Programming User's Manual | 10/2017
10.1 Principle and overview of functions
With Q parameters you can program entire families of parts in a
single NC program by programming variable Q parameters instead
of fixed numerical values.
Use Q parameters for e.g.:
Coordinate values
Feed rates
Spindle speeds
Cycle data
With Q parameters you can also:
Program contours that are defined through mathematical
functions
Make execution of machining steps depend on certain logical
conditions
Variably design FK programs
Q parameters are always identified with letters and numbers. The
letters determine the type of Q parameter and the numbers the
Q parameter range.
For more information, see the table below:
Q parameter
type Q parameter range Meaning
Q parameters: Parameters affect all NC programs in the control’s memory
0 – 99 Parameters for the user , if there are no overlaps with the
HEIDENHAIN-SL cycles
100 – 199 Parameters for special functions on the control that can be read
by NC programs of the user or by cycles
200 – 1199 Parameters primarily used for HEIDENHAIN cycles
1200 – 1399 Parameters that are primarily used with manufacturer cycles when
values are given back to the user program
1400 – 1599 Parameters primarily used as input parameters for manufacturer
cycles
1600 – 1999 Parameters for users
QL parameters: Parameters only effective locally within an NC program
0 – 499 Parameters for users
QR parameters: Parameters permanently (remanence) affect all NC programs
in the control’s memory, even after a power interruption
0 to 99 Parameters for users
100 to 199 Parameters for HEIDENHAIN functions (e.g., cycles)
200 to 499 Parameters for the machine tool builder (e.g., cycles)