HEIDENHAIN TNC 320 (340 55x-03) - Manual (Page 456)

456 11 Test Run and Program Run
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1
.4 T
e
st Run
11.4 Test Run
Function
In the Test Run mode of operation you can simulate programs and
program sections to prevent errors from occurring 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
„ Optional block skip
„ Functions for graphic simulation
„ Measuring the machining time
„ Additional status display
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, and
„ positioning movements that lead to a pallet change.
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, at the MIN point defined in the
BLK FORM.
„ In the tool axis, 1 mm above the MAX point defined in the
BLK FORM
If you call the same tool, the TNC resumes program
simulation from the position last programmed before the
tool call.
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.