Siemens SINUMERIK 840D sl Programming Manual page 529

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N10 G1 G91 SON X10 Y10

N20 SPP=3.5 X15 Y15

When the total traversing distance is 15 mm and the path segment length 3.5 mm, the

quotient is not an integer value (4.28). In this case, the SPP value is reduced down to the

next possible integer quotient. The result in this example would be a path segment length of

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.

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, 03/2006 Edition, 6FC5398-2BP10-1BA0

Punching and nibbling

12.2 Automatic path segmentation