HEIDENHAIN TNC 426 (280 476) - Manual (Page 465)

438 12 MOD Functions
12.1
0 Select the unit of measur
ement
12.10 Select the unit of
measurement
Function
This MOD function determines whether the coordinates are displayed
in millimeters (metric system) or inches.
n
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.
n 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.
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 large
by a factor of 10.