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10
MOD Functions
TNC 426/TNC 425/TNC 415 B/TNC 407
10.8 Unit of Measurement
This MOD function determines whether 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 INCH.
The value is displayed to 4 decimal places.
10.9 Programming Language for $MDI
The PROGRAM INPUT mod function lets you decide whether to program
the $MDI file in HEIDENHAIN conversational dialog or in G-codes in
accordance with ISO.
• To program the $MDI.H file in conversational dialog,
set the PROGRAM INPUT function to HEIDENHAIN.
• To program the $MDI.I file according to ISO,
set the PROGRAM INPUT function to ISO.
10.10 Selecting the Axes for Generating L Blocks
(conversational programming only)
The AXIS SELECTION input field enables you to define the current tool
position coordinates that are transferred to an L block. To generate a
separate L block, press the "ACTUAL POSITION CAPTURE" soft key
(see User's Manual for HEIDENHAIN Conversational Programming). On
the TNC 407, up to 3 coordinates can be transferred; on the TNC 415 B,
TNC 425 and TNC 426 controls, you can transfer up to 5 coordinates. The
axes are selected by bit-oriented definition, similar to programming the
machine parameters.
AXIS SELECTION
%11111
Transfer the X, Y, Z, IV, and V axes
AXIS SELECTION
%01111
Transfer the X, Y, Z, and IV axes
AXIS SELECTION
%00111
Transfer the X, Y, and Z axes
AXIS SELECTION
%00011
Transfer the X and Y axes
AXIS SELECTION
%00001
Transfer the X axis
