Siemens SINUMERIK 840D sl Function Manual page 718

Detailed description
2.9 Program control
Applications
• Direct execution from external programs
• Execution of external sub-programs from the part program
Parameterization
A reloading memory (FIFO buffer) must be reserved in the dynamic NC memory for
executing a program in the "Executing from external" mode (main program or subroutine).
Size of FIFO buffer
The size of the FIFO buffer is set in the machine data:
MD18360 $MN_MM_EXT_PROG_BUFFER_SIZE (FIFO buffer size for processing from
external)
Default: 30 kbyte
Number of the FIFO buffer
One FIFO buffer must be provided each for all programs (main run or subroutine) that are
executed simultaneously in the "Execution from external source" mode.
The number of the FIFO buffer is set in the machine data:
MD18362 $MN_MM_EXT_PROG_NUM (number of externally executed program levels
executable simultaneously)
Behavior during RESET, POWER ON
External program calls are aborted through RESET and POWER ON and the concerned
FIFO buffers are erased.
A program selected for "Execution from external source" remains selected for "Execution
from external source" even after RESET / part program end. A POWER ON deletes the
selection.
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In principle, any program that is accessible via the directory structure of the interface in
the "Execution from external" HMI mode can be selected and executed.
The external subroutine is called through the part program command EXTCALL with
specification of a call path (optional) and the subroutine identifier (→ refer to Chapter:
"Execution from external subroutines").
Basic logic functions: Mode group, channel, program operation, reset response (K1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0