Siemens SINUMERIK 840D sl Programming Manual page 395

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Table of Contents

Example of the use of CTABSSV and CTABSEV

Determining the curve segment belonging to master value X = 30.

N10 DEF REAL STARTPOS

N20 DEF REAL ENDPOS

N30 DEF REAL GRADIENT

N100 CTABDEF(Y,X,1,0)

N120 X20 Y10

N130 X40 Y40

N140 X60 Y10

N160 CTABEND

N200 STARTPOS =

CTABSSV(30.0, 1, GRADIENT)

N210 ENDPOS =

CTABSEV(30.0, 1, GRADIENT)

Reading table positions, CTAB, CTABINV

CTABINV therefore requires an approximate value (approxLV) for the expected leading

value. CTABINV returns the leading value that is closest to the approximate value. The

approximate value can be the leading value from the previous interpolation cycle.

Job planning

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

;Begin of the table definition

;Starting position 1st table segment

;End position of the 1st table segment =

;Start position of the

;2nd table segment ...

;End of table definition

;Start position Y in segment 2 = 10

;End position Y in segment 2 = 40

;Segment 2 belongs to LV X = 30.0.

Path traversing behavior

9.3 Curve tables (CTAB)