HEIDENHAIN TNC 640 (34059x-04) ISO programming - Manual (Page 556)

MOD functions
18.3 Machine settings
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TNC 640 | User's Manual for DIN/ISO Programming | 3/2014
Select kinematics
The Select Kinematics function must be enabled and
adapted by the machine manufacturer.
Refer to your machine manual.
You can use this function to test programs whose kinematics
does not match the active machine kinematics. If your machine
manufacturer saved different kinematic configurations in your
machine, you can activate one of these kinematics configurations
with the MOD function. When you select a kinematics model for
the test run this does not affect machine kinematics.
Danger of collision!
When you switch the kinematics model for machine
operation, the TNC implements all of subsequent
movements with modified kinematics.
Ensure that you have selected the correct kinematics
in the test run for checking your workpiece.