Siemens SINUMERIK 840D sl Function Manual page 757

Block search
In the case of a search for a block containing a nibbling function, it is possible to program
whether the punch stroke is executed at the block beginning or suppressed.
The setting is programmed in machine data:
MD11450 $MN_SEARCH_RUN_MODE
Bit
5
References:
/FB1/ Function Manual, Basic Functions; Mode Group, Channel, Program Operation, Reset
Response (K1), Section "Block search"
10.3.3 Compatibility with earlier systems
Use of M functions
As in earlier versions, macro technology allows special M functions to be used instead of
language commands (compatibility).
The M functions and equivalent language commands as used in earlier systems are as
follows:
M20, M23
M22
M25
M26
Note
M functions can be configured in machine data.
When M functions are assigned to language commands, it must be noted that M functions
are organized in auxiliary function groups.
Extended Functions
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Value Meaning
0 Punch stroke at beginning of block is suppressed.
1 Punch stroke at beginning of block is executed.
SPOF
≙
SON
≙
PON
≙
PDELAYON
≙
Punching and Nibbling (N4)
Activation and deactivation
757