HEIDENHAIN TNC 620 (340 56x-02) ISO programming - Manual (Page 398)

398 MOD Functions
15.7 Unit of Measur
ement
15.7 Unit of Measurement
Application
This MOD function 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/inches function to mm. The value is displayed to 3 decimal
places.
„ To select the inch system (e.g. X = 0.6216 inches), set the Change
mm/inches function to inches. The value is displayed to 4 decimal
places.
If you would like to activate the inch display, the TNC shows the feed
rate in inch/min. In an inch program you must enter the feed rate larger
by a factor of 10.