Siemens SINUMERIK 840D Function Manual page 440

M3: Coupled axes
14.2 Curve tables
● Axis names from gantry axis groups cannot be used to define a table (only leading axis are
possible).
● Depending on the following machine data, jumps in the following axis may be tolerated if a
movement is missing in the leading axis.
MD20900 $MC_CTAB_ENABLE_NO_LEADMOTION (curve tables with discontinuity of the
following axis)
The other restrictions listed above still apply.
Axis assignment
Does not take effect until coupling is activated with curve table.
Note
The dynamic limit values of the motion commands for a curve table are not checked until
activation or interpolation.
Starting value
The first motion command in the definition of a curve table defines the starting value for the
leading and following value.
All instructions that cause a preprocessing stop must be hidden.
Example 1
Without tool radius compensation, without memory type
Program code
N100 CTABDEF(AX2, AX1, 3.0)
N110 AX1=0 AX2=0
N110 AX1=20 AX2=0
N120 AX1=100 AX2=6
N130 AX1=150 AX2=6
N130 AX1=180 AX2=0
N200 CTABEND
440
Comment
; start of the definition for the non-
; periodic curve table no. 3
; 1st Motion instruction specifies the start value
; leading value: 0, Following value: 0
; 1st Curve segment: Master value: 0...20,
; following value: Starting value ...0
; 2nd Curve segment: Master value: 20...100,
; following value: 0...6
; 3rd Curve segment: Master value: 100...150,
; following value 6
; 4th Curve segment: Master value: 150...180,
; following value: 6...0
; end of the definition, the curve table
; is generated in its internal representation.
; the advance is reorganized to the status
; at the start of N100
Function Manual, 06/2019, A5E47437747B AA
Axes and spindles