HEIDENHAIN TNC 640 (34059x-01) ISO programming - Manual (Page 454)

454 MOD Functions
16.6 P
o
sition Displa
y T
y
pes
16.6 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:
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.
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;
difference between actual and target positions DIST