HEIDENHAIN TNC 640 (34059x-01) ISO programming - Manual (Page 430)

430 Test Run and Program Run
15.5 Pr
ogr
am r
u
n Mid-program startup (block scan)
With the RESTORE POS AT N feature (block scan) you can start a part
program at any block you desire. The TNC scans the program blocks
up to that point. Machining can be graphically simulated.
If you have interrupted a part program with an INTERNAL STOP, the
TNC automatically offers the interrupted block N for mid-program
startup.
The RESTORE POS AT N feature must be enabled and
adapted by the machine tool builder. Refer to your
machine manual.
Mid-program startup must not begin in a subprogram.
All necessary programs, tables and pallet files must be
selected in a program run mode of operation (status M).
If the program contains a programmed interruption before
the startup block, the block scan is interrupted. Press the
machine START button to continue the block scan.
After a block scan, return the tool to the calculated position
with RESTORE POSITION.
Tool length compensation does not take effect until after
the tool call and a following positioning block. This also
applies if you have only changed the tool length.
The TNC skips all touch probe cycles in a mid-program
startup. Result parameters that are written to from these
cycles might therefore remain empty.
You may not use mid-program startup if the following
occurs after a tool change in the machining program:
„ The program is started in an FK sequence
„ The stretch filter is active
„ Pallet management is used
„ The program is started in a threading cycle (Cycles 17,
18, 19, 206, 207 and 209) or the subsequent program
block
„ Touch-probe cycles 0, 1 and 3 are used before program
start