HEIDENHAIN TNC 640 (34059x-02) - Manual (Page 336)

Programming: Q Parameters
9.12 Preassigned Q parameters
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TNC 640 | User's Manual
HEIDENHAIN Conversational Programming | 5/2013
9.12 Preassigned Q parameters
The Q parameters Q100 to Q199 are assigned values by the TNC.
The following types of information 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.
The TNC saves the values for the preassigned Q parameters Q108,
Q114 and Q115 to Q117 in the unit of measure used by the active
program.
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.
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.
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
The TNC remembers the current tool radius even if
the power is interrupted.
Tool axis: Q109
The value of Q109 depends on the current tool axis:
Tool axis Parameter value
No tool axis defined Q109 = –1
X axis Q109 = 0
Y axis Q109 = 1
Z axis Q109 = 2
U axis Q109 = 6
V axis Q109 = 7
W axis Q109 = 8