HEIDENHAIN TNC 426B (280 472) ISO programming - Manual (Page 269)

10 Programming: Q Parameters 254
1
0.1 Pr
inciple and Ov
erview
10.1 Principle and Overview
You can program an entire family of parts in a single part program.
You do this by entering variables called
Q parameters instead of
fixed numerical values.
Q parameters can represent information such as:
■ Coordinate values
■ Feed rates
■ RPM
■ Cycle data
Q parameters also enable you to program contours that are defined
through mathematical functions. You can also use Q parameters to
make the execution of machining steps depend on logical
conditions.
Q parameters are designated by the letter Q and a number between
0 and 399. They are grouped according to three ranges:
Meaning Range
Freely applicable parameters, global for Q0 to Q99
all programs in the TNC memory.
Parameters for special TNC functions Q100 to Q199
Parameters that are primarily used for cycles, Q200 to Q399
global for all programs (TNC 410: to Q299)
in the TNC memory
Programming notes
You can mix Q parameters and fixed numerical values within a
program.
Q parameters can be assigned numerical values between
–99 999.9999 and +99 999.9999.
Some Q parameters are always assigned the same data
by the TNC. For example, Q108 is always assigned the
current tool radius. For further information, see section
“10.9 Preassigned Q Parameters.”
If you are using the parameters Q1 to Q99 in OEM
cycles, define via
MP7251 whether the parameters are only to be used
locally in the OEM cycles, or may be used globally.
Q4
Q2
Q3 Q1
Q5
Q6
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