Siemens SINUMERIK 840D sl Function Manual page 599

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External program memory

External program memory can be found on the following data carriers:

● Local drive

● Network drive

Only the USB interfaces on the operator panel front or the TCU can be used as interface

for the processing of an external program on a USB drive.

Applications

● Direct execution from external programs

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.

● Execution of external subprograms from the part program

The external subprogram is called through the part program command EXTCALL with

specification of a call path (optional) and the subprogram name (→ see "Executing external

subprograms (EXTCALL) (Page 600)").

Parameter assignment

A reloading memory (FIFO buffer) must be reserved in the dynamic NC memory for executing

a program in "execution from external source" mode.

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

Programs with jump commands

For external programs that contain jump commands (GOTOF, GOTOB, CASE, FOR, LOOP,

WHILE, REPEAT, IF, ELSE, ENDIF etc.) the jump destinations must lie within the post loading

Basic Functions

Function Manual, 01/2015, 6FC5397-0BP40-5BA2

Tool/workpiece damage caused by the USB FlashDrive

It is recommended that a USB-FlashDrive is not used for the execution of an external

subprogram. A communication interruption to the USB FlashDrive during the execution of

the subprogram due to contact problems, failure, abort through trigger or unintentional

unplugging, results in an immediate machining stop. The tool and/or workpiece could be

K1: Mode group, channel, program operation, reset response

9.14 Program control

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