Siemens SINUMERIK 840D sl Function Manual page 749

SPOF
Punching and nibbling OFF
The SPOF function terminates all punching and nibbling functions. In this state, the NCK
responds neither to the "Stroke active" signal nor to the PLC signals specific to punching and
nibbling functions.
If SPOF is programmed together with a travel command in one block (and in all further blocks
if punching/nibbling is not activated with SON or PON), the machine approaches the
programmed position without the initiation of a punching operation. SPOF deselects SON,
SONS, PON and PONS and corresponds to the Reset condition.
Programming example:
:
:
N20 G90 X100 SON
N25 X50 SPOF
:
:
SON
Nibbling ON
SON activates the nibbling function and deselects the other functions in G group35 (e.g. PON).
In contrast to punching, the first stroke is made at the start point of the block with the
activating command, i.e. before the first machine motion.
SON has a modal action, i.e. it remains active until either SPOF or PON is programmed or until
the program end is reached.
The stroke initiation is suppressed in blocks without traversing information relating to the
axes designated as punching or nibbling axes (typically those in the active plane). If a stroke
still needs to be initiated, then one of the punching/nibbling axes must be programmed with a
0 traversing path. If the first block with SON is a block without traversing information of the
type mentioned, then only one stroke takes place in this block since the start and end points
are identical.
Programming example:
:
:
N70 X50 SPOF
N80 X100 SON
:
:
Extended Functions
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
; activate nibbling
; deactivate nibbling,
; position without stroke initiation
; position without punch initiation
; activate nibbling, initiate a stroke before the
; motion (X=50) and on completion of the programmed
; movement (X=100)
Punching and Nibbling (N4)
Activation and deactivation
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