12 Punching and Nibbling 08.9712.2 Automatic path segmentation 12840 DNCU 572NCU 573840Di Siemens AG 2000. All rights reserved12-422 SINUMERIK 840D/840Di/810D/FM-NC Programming Guide Advanced (PGA) – 04.00 EditionNumber of SPN path segmentsSPN defines the number of path segments to begenerated from the total traversing distance. Thelength of the segments is calculated automatically.Since SPN is non-modal, punching or nibbling mustbe activated beforehand with PON or SONrespectively.SPP and SPN in the same blockIf you program both the path segment length (SPP)and the number of path segments (SPN) in thesame block, then SPN applies to this block and SPPto all the following blocks.If SPP was activated before SPN, then it takes effectagain after the block with SPN.X2/Y2 Programmed traversing distanceX1 Automatically calculated segment in XY1 Automatically calculated segment in YX2 XX1Y1Y2YAdditional notesProvided that punching/nibbling functions areavailable in the control, then it is possible to programthe automatic path segmentation function with SPNor SPP even when the punching/nibbling functionsare not in use.12.2.2 Path segmentation for single axesIf single axes are defined as punching/nibbling axesin addition to path axes, then the automatic pathsegmentation function can be activated for them.Response of single axis to SPPThe programmed path segment length (SPP)basically refers to the path axes.For this reason, the SPP value is ignored in blockswhich contain a single axis motion and an SPPvalue, but not a programmed path axis.