Siemens Sinumerik 840D sl Programming Manual page 674

Punching and nibbling
12.2 Automatic path segmentation
Number of SPN path segments
SPN defines the number of path segments to be generated from the total traversing distance.
The length of the segments is calculated automatically. Since SPN is non-modal, punching or
nibbling must be activated beforehand with PON or SON respectively.
SPP and SPN in the same block
If you program both the path segment length (SPP) and the number of path segments (SPN) in
the same block, then SPN applies to this block and SPP to all the following blocks. If SPP was
activated before SPN, then it takes effect again after the block with SPN.
Note
Provided that punching/nibbling functions are available in the control, then it is possible to
program the automatic path segmentation function with SPN or SPP even independent of
this technology.
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Programming Manual, 02/2011, 6FC5398-2BP40-1BA0
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