Executing External Subprograms (Extcall) - Siemens SINUMERIK 840D sl Function Manual

K1: Mode group, channel, program operation, reset response
9.14 Program control
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.
Number of FIFO buffers
One FIFO buffer must be provided for each one of the programs that are executed
simultaneously in "execution from external source" mode.
The number of FIFO buffers is set in the machine data:
MD18362 $MN_MM_EXT_PROG_NUM (number of externally executed program levels
executable simultaneously)
Behavior on reset, power-on
External program calls are aborted using reset and power-on and the particular FIFO buffers
are erased.
A main program selected from an external program memory is selected again automatically
after a power-on if the same program memory is still available and execution of EXTCALL calls
has been activated in MD9106 $MM_SERVER_EXTCALL_PROGRAMS.
9.14.8

Executing external subprograms (EXTCALL)

Function
Individual machining steps for producing complex workpieces may involve program sequences
that require so much memory that they cannot be stored in the NC memory.
In such cases, the user has the option of executing the program sequences as subprograms
from an external program memory in the "Execution from external source" mode with the help
of the EXTCALL part program command.
Preconditions
The following preconditions are applicable to the execution from external subprograms:
● The subprograms must be accessible via the directory structure of the operator interface.
● A reloading memory (FIFO buffer) must be reserved for each subprogram in the dynamic
NC memory.
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Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions