HEIDENHAIN TNC 310 (286 140) - Manual (Page 228)

13 MOD Functions 216
13.5 Mac
hine-Specific User P
ar
amet
ers
13.6 Select the position displa
y;
13.7 Select Units of Measur
e
13.5 Machine-Specific User Parameters
The machine tool builder can assign functions to up to 16
USER PARAMETERS. Your machine manual provides
more detailed information.
13.6 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 by the TNC
NOML.
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 actual positions
LAG
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.
13.7 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/INCH 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.
NOML.
ACTL. LAG
REF DIST.