HEIDENHAIN iTNC 530 (340 49x-04) ISO programming - Manual (Page 558)

558 11 Programming: Q-Parameters
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11.10 Preassigned Q Parameters
The Q parameters Q100 to Q122 are assigned values by the TNC. The
Q parameters are assigned:
„ 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 TOOL CALL block
Preassigned Q parameters between Q100 and Q199 must
not be used as calculation parameters in NC programs.
Otherwise you might receive undesired results.