HEIDENHAIN 530 (340 49x-07) ISO programming - Manual (Page 306)

306 Programming: Q-Parameters
9.1
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Pr
eassigned Q P
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9.10 Preassigned Q Parameters
The Q parameters Q100 to Q199 are assigned values by the TNC. The
following are assigned to Q parameters:
„ 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 G99 block)
„ Delta value DR from the tool table
„ Delta value DR from the T 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.
The TNC remembers the current tool radius even if the
power is interrupted.