HEIDENHAIN TNC 410 User Manual

Page 219

10 Programming: Q Parameters

206

0.1 Pr

inciple and Ov

erview

10.1 Principle and Overview

You can program an entire family of parts on the TNC with 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 299. They are grouped according to three ranges:

Meaning

Range

Freely applicable parameters, global for

Q0 to Q99

all programs in the TNC memory. When you call
OEM cycles, these parameters are only effective
locally (depending on MP7251).

Parameters for special TNC functions

Q100 to Q199

Parameters that are primarily used for cycles,

Q200 to Q299

globally effective for all programs and OEM
cycles that are stored 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.”