HEIDENHAIN TNC 410 - Manual (Page 285)

14 MOD Functions 272
14.6 Position Display Types
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 NOML.
by the TNC
Actual position: current tool position
ACTL.
Reference position: the actual position as referenced REF
to the machine datum
Distance remaining to the programmed position;
DIST.
difference between actual and target positions
Servo lag: difference between nominal and
LAG
actual positions
With the MOD function Position display 1 you can select the
position display in the status display. With Position display 2 you can
select the position display in the additional status display.
14.7 Unit of Measurement
The MOD function Change MM/INCHES determines whether the
coordinates are displayed in millimeters (metric system) or inches.
■ To select the metric system (e.g. X = 15.789 mm) set the Change
MM/INCH function to mm. The value is displayed with 3 digits
after the decimal point.
■ To select the inch system (e.g. X = 0.6216 inch) set the Change
MM/inches function to inches. The value is displayed to 4 decimal
places.
This MOD function also determines the unit of measurement when
you open a new program.
14.6 P
osition Displa
y
Types;
14.7 Unit of Measur
ement
NOML.
ACTL. LAG
REF DIST.