Siemens SINUMERIK 840Di Function Manual page 668

Detailed Description
2.9 Program control
Buffer interpretation
• Settable size of reload memory / FIFO buffer:
2.9.6 Execution from external subroutines
Subprogram call
The "external" subroutine is called with part program command
• EXTCALL with specified <path> and optionally <program name>
Program command EXTCALL is capable of reloading a program in "Execution from external
source" mode via the HMI. The external programs must be accessible via the directory
structure on the HMI operator interface. They can be stored on the following data media:
HMI Advanced:
HMI Embedded:
Setting Data
SD42700 $SC_EXT_PROG_PATH
SD42700 $SC_EXT_PROG_PATH can be used to set the call path flexibly.
SD42700 $SC_EXT_PROG_PATH contains the path name, which, together with the
programmed subroutine identifier, represents the absolute path name of the program to be
called.
If an external subroutine is called without an absolute path name, HMI Advanced runs
through the same search path as applied when a subroutine is called from the NC main
memory.
2-132
A FIFO buffer must be set up in the NCK in order to execute a program (main program or
subroutine) in "Execution from external" mode. The default setting for this buffer size is
30KB.
Machine data MD18360 $MN_MM_EXT_PROG_BUFFER_SIZE can be used to define
the size of the reload buffer. The number of reload buffers is set with
MD18362 $MN_MM_EXT_PROG_BUFFER_NUM. A reload buffer must be made
available for each of the programs (main run or subroutine) that are processed
simultaneously in "Execution from external source" mode.
Reload buffers are set up in the NCK DRAM. If there is insufficient DRAM available,
Alarm 4077 "New value of machine data MD 18360/18362 not set" is generated.
Local hard disk or network drive
ATA card or network drive
Mode Group, Channel, Program Operation, Reset Response (K1)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0