HEIDENHAIN iTNC 530 User Manual page 275

Meaning
Freely applicable parameters, globally
effective for all programs stored in the TNC
memory
Freely usable QL parameters, only effective
locally (within a program)
Freely usable QR parameters that are
nonvolatile, i.e. they remain in effect even
after a power interruption
QS parameters (the S stands for string) are also available on the TNC
and enable you to process texts. In principle, the same ranges are
available for QS parameters as for Q parameters (see table above).
Note that for the QS parameters the QS100 to QS199 range
is reserved for internal texts.
HEIDENHAIN iTNC 530
Range
Q1600 to Q1999
QL0 to QL499
QR0 to QR499
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