Siemens SINUMERIK 840D sl Function Manual page 629

The following conditions apply:
● Path segmentation is active only when SON or PON is active.
(Exception: MD26014 $MC_PUNCH_PATH_SPLITTING = 1)
● SPP is modally active, i.e. the programmed segment remains valid until it is programmed
again, but it can be suppressed on a block-by-block (non-modal) basis by means of SPN.
● The path segments are rounded off by the control system if required so that a total
programmed distance can be divided into an integral number of path sections.
● The path segment unit is either mm/stroke or inch/stroke (depending on axis settings).
● If the programmed SPP value is greater than the traversing distance, then the axis is
positioned on the programmed end position without path segmentation.
● SPP = 0, reset or program end delete the programmed SPP value. The SPP value is not
deleted when punching/nibbling is deactivated.
SPN
The automatic path segmentation function SPN divides the traversing path into the
programmed number of path segments.
The following conditions apply:
● Path segmentation is active only when SON or PON is active.
(Exception: MD26014 $MC_PUNCH_PATH_SPLITTING = 1)
● SPN has a non-modal action.
● Any previously programmed SPP value is suppressed for the block containing SPN, but is
re-activated again in the following blocks.
Supplementary conditions
● The path segmentation function is operative with linear and circular interpolation.
The interpolation mode remains unchanged, i.e. circles are traversed when circular
interpolation is selected.
● If a block contains both SPN (number of strokes) and SPP (stroke path), then the number
of blocks is activated in the current block while the stroke path is activated in all blocks that
follow.
● Path segmentation is active only in conjunction with punching or nibbling functions.
(Exception: MD26014 $MC_PUNCH_PATH_SPLITTING = 1).
● Any programmed auxiliary functions are output before, during the first or after the last sub-
block.
● In the case of blocks without traversing information, the rules which govern the
programming of SON and PON also apply to SPP and SPN. In other words, a stroke is initiated
only if an axis motion has been programmed.
Extended Functions
Function Manual, 10/2015, 6FC5397-1BP40-5BA3
N4: Own channel - only 840D sl
10.4 Automatic path segmentation
629