HEIDENHAIN TNC 640 (34059x-05) ISO programming - Manual (Page 560)

Test run and program run
17.4 Test Run
17
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TNC 640 | User's ManualDIN/ISO Programming | 1/2015
17.4 Test Run
Application
In the Test Run mode of operation, you can simulate programs and
program sections to reduce programming errors during program
run. The TNC checks the programs for the following:
Geometrical incompatibilities
Missing data
Impossible jumps
Violation of the machine's working space
The following functions are also available:
Blockwise test run
Interruption of test at any block
Optional block skip
Functions for graphic simulation
Measure machining time
Additional status display
Danger of collision!
The TNC cannot graphically simulate all traverse
motions actually performed by the machine. These
include
Traverse motions during tool change, if the
machine manufacturer defined them in a tool-
change macro or via the PLC
Positioning movements that the machine
manufacturer defined in an M-function macro
Positioning movements that the machine
manufacturer performs via the PLC
HEIDENHAIN therefore recommends proceeding
with caution for every new program, even when the
program test did not output any error message, and
no visible damage to the workpiece occurred.
After a tool call, the TNC always starts a program test
at the following position:
In the working plane in the center of the defined
BLK FORM
In the tool axis, 1 mm above the
MAX point
defined in the BLK FORM
With rotationally symmetric workpiece blanks, the
TNC starts a program test run after a tool call at the
following position:
In the machining plane at the position X=0, Y=0
In the tool axis 1 mm above the defined
workpiece blank
In order to ensure unambiguous behavior during
program run, after a tool change you should always
move to a position from which the TNC can position
the tool for machining without causing a collision.