Siemens SINUMERIK 840D sl Programming Manual page 221

RESET, POWER ON
RESET and POWER ON cause external subprogram calls to be interrupted and the
associated load memory to be erased.
A subprogram selected for "Execution from external source" remains selected for "Execution
from external source" after a RESET/part-program end. A POWER ON deletes the selection.
Examples
1. Execution from local hard disk
Systems: SINUMERIK solution line/powerline with HMI Advanced
The "_N_MAIN_MPF" main program is stored in NC memory and is selected for execution:
Program code
N010 PROC MAIN
N020 ...
N030 EXTCALL ("ROUGHING")
N040 ...
N050 M30
The "_N_ROUGHING_SPF" subprogram to be reloaded is stored on the local hard disk in
the directory "_N_WKS_DIR/_N_WST1".
The subprogram path is preset in SD42700:
SD42700 $SC_EXT_PROG_PATH = "_N_WKS_DIR/_N_WST1"
Program code
N010 PROC ROUGHING
N020 G1 F1000
N030 X= ... Y= ... Z= ...
N040 ...
...
...
N999999 M17
Job Planning
Programming Manual, 06/2009, 6FC5398-2BP20-0BA0
Flexible NC programming
1.25 Subprogram technique
221