HEIDENHAIN iTNC 530 (340 49x-03) - Manual (Page 612)

612 11 Programming: Q Parameters
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11.11 Preassigned Q Parameters
The Q parameters Q100 to Q199 are assigned values by the TNC.
These values include:
„ Values from the PLC
„ Tool and spindle data
„ Data on operating status
„
Results of measurements from touch probe cycles etc.
Values from the PLC: Q100 to Q107
The TNC uses the parameters Q100 to Q107 to transfer values from
the PLC to an NC program.
WMAT block: QS100
The TNC saves the material defined in the WMAT block in parameter
QS100.
Active tool radius: Q108
The active value of the tool radius is assigned to Q108. Q108 is
calculated from:
„ Tool radius R (Tool table or TOOL DEF block)
„ Delta value DR from the tool table
„
Delta value DR from the TOOL CALL block
Do not use preassigned Q parameters (or QS parameters)
between Q100 and Q199 (QS100 and QS199) as calculation
parameters in NC programs. Otherwise you might receive
undesired results.