HEIDENHAIN TNC 640 (34059x-04) ISO programming - Manual (Page 558)

MOD functions
18.5 Position Display Types
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TNC 640 | User's Manual for DIN/ISO Programming | 3/2014
18.5 Position Display Types
Application
In the Manual Operation mode and in the Program Run modes of
operation, you can select the type of coordinates to be displayed.
The figure at right shows the different tool positions:
Starting position
Target position of the tool
Workpiece datum
Machine datum
The TNC position displays can show the following coordinates:
Function Display
Nominal position: the value presently
commanded by the TNC
NOML.
Actual position; current tool position ACTL.
Reference position; the actual position relative
to the machine datum
REF ACTL
Reference position; the nominal position
relative to the machine datum
REF NOML
Servo lag; difference between nominal and
actual positions (following error)
LAG
Distance remaining to the programmed
position in the input system; difference
between actual and target positions
ACTDST
Distance remaining to the programmed
position with reference to the machine datum;
difference between reference and target
positions
REFDST
Traverses that were carried out with
handwheel superimpositioning (M118)
M118
With the MOD function Position display 1, you can select the
position display in the status display.
With the MOD function
Position display 2, you can select the
position display in the status display.