Siemens Sinumerik 840D sl Function Manual page 186

DNC Plant/DNC Cell (FBDN1)
10 Configuration

Spacer
If a file contains several NC programs that are to be sent to a machine
together, certain controllers require a spacer to be transmitted between the
individual NC programs.
The spacer consists of a configurable number (SpacerSize) of identical
characters (SpacerChar).
Note
If code conversion is activated, the spacer is converted too. (This is not the case
with the header and trailer, which must be configured directly in line with the code
type.)
Up to six strings can be configured for the search to determine where the
spacer is to be inserted. Three strings are used for searching for a start-of-
program identifier (SpacerMark1..3), and three for an end-of-program identifier
(SpacerMarkInsertAfter1..3).
Note
A search should be carried out for start-of-program identifiers only or end-of-
program identifiers only, otherwise two spacers may be inserted between the NC
programs.
When the system searches for start-of-program identifiers, the spacer is
inserted before the line containing the start-of-program identifier.
When the system searches for end-of-program identifiers, the spacer is inserted
after the line containing the end-of-program identifier.

Spacer size
The spacer size is specified in bytes. It describes the number of spacer
characters to be inserted.
Extract from machine configuration file:
SpacerSize=15
FBDN1/10-178
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Motion Control Information System DNC (FBDN) - 04/10 Edition
05.07