Siemens SINUMERIK 840D sl Programming Manual page 908

Work preparation
3.16 Axis couplings
Program code
N220 STARTPARA=CTABTSP(1,GRADIENT)
N230 ENDPARA=CTABTEP(1,GRADIENT)
N240 MINVAL=CTABTMIN(1)
N250 MAXVAL=CTABTMAX(1)
Example 2:
Determination of following axis values at the start and end of the curve segment associated with
leading axis value X=30.
Program code
N10 DEF REAL STARTPOS
N20 DEF REAL ENDPOS
N30 DEF REAL GRADIENT
...
N100 CTABDEF(Y,X,1,0)
N110 X0 Y0
N120 X20 Y10
N130 X40 Y40
N140 X60 Y10
N150 X80 Y0
N160 CTABEND
...
N200 STARTPOS=CTABSSV(30.0,1,GRADIENT) ; Start position Y in 2nd segment = 10
N210 ENDPOS=CTABSEV(30.0,1,GRADIENT)
Further information
Use in synchronized actions
All commands for reading curve table values can also be used in synchronized actions (see
also the chapter titled "Motion-synchronous actions").
When using the CTABINV, CTABTMIN, and CTABTMAX commands, make sure that:
● Sufficient NC power is available at the time of execution
or
● The number of segments in the curve table is queried prior to the call, so that the table
concerned can be subdivided if necessary
CTAB with non-periodic curve tables
If the specified <master value> is outside the definition range, the upper or lower limit is output
as the following value:
908
Comment
; Master axis value at start of curve table =
0
; Master axis value at end of curve table = 80
; Minimum value of following axis with Y=5
; Maximum value of following axis with Y=40
Comment
; Start of table definition.
; Start position 1st table segment
; End position 1st table segment =
start position 2nd table segment
; End position 2nd table segment = ...
; End of table definition.
; End position Y in 2nd segment = 40
Programming Manual, 12/2019, 6FC5398-2EP40-0BA0
NC programming