HEIDENHAIN TNC 640 (34059x-02) ISO programming - Manual (Page 528)

Test run and program run
17.5 Program run
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TNC 640 | User's Manual for DIN/ISO Programming | 5/2013
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
Go to the first block of the current program to start a block scan:
Enter GOTO "0"
Select mid-program startup: Press the MID-
PROGRAM STARTUP soft key
Start-up at N: Enter the block number N at which
the block scan should end
Program: Enter the name of the program
containing block N
Repetitions: If block N is located in a program
section repeat or in a subprogram that is to be run
repeatedly, enter the number of repetitions to be
calculated in the block scan
Start mid-program startup: Press the machine
START button
Contour approach (see following section)
Entering a program with the GOTO key
If you use the GOTO block number key for going into
a program, neither the TNC nor the PLC will execute
any functions that ensure a safe start.
If you use the GOTO block number key for going into
a subprogram,
the TNC will skip the end of the subprogram ( G98
L0)
the TNC will reset function M126 (Shorter-path
traverse of rotary axes)
In such cases you must always use the mid-program
startup function.