Siemens SINUMERIK 840D sl Programming Manual page 538

Work preparation
3.2 Subprogram technique
Note
ShopMill/ShopTurn programs
The contour descriptions added at the file end mean the ShopMill and ShopTurn programs
must be stored completely in the read-only memory.
A separate reload memory is required for external subprograms executed in parallel.
Reset / end of program / POWER ON
Reset and POWER ON cause external subprogram calls to be interrupted and the associated
load memory to be deleted.
A program selected for "Execution from external source" remains selected for "Execution from
external source" after a reset / end of program. The behavior does not differ from internally
selected programs, assuming that the external program memory is still available.
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Programming Manual, 12/2019, 6FC5398-2EP40-0BA0
NC programming