Siemens SINUMERIK 840D sl Operating Manual page 232

Creating a ShopTurn program
7.4 Fundamentals
Incremental dimensions (INC)
With incremental dimensions (also referred to as sequential dimensions) a position
specification refers to the previously programmed point, i.e. the input value corresponds to
the path to be traversed. As a rule, the plus/minus sign does not matter when entering the
incremental value, only the absolute value of the increment is evaluated. For some
parameters, the plus/minus sign specifies the traversing direction. These exceptions are
identified in the parameter table of the individual functions.
Figure 7-8
The position specifications for points P1 to P4 in incremental dimensions are as follows:
P1: X12.5 Z-7.5 (relative to the zero point)
P2: X7.5 Z-7.5 (relative to P1)
P3:X0 Z-10 (relative to P2)
P4: X10 Z-10 (relative to P3)
232
Incremental dimensions
Operating Manual, 02/2012, 6FC5398-8CP40-3BA0
Turning