Siemens sinumerik 808d Programming And Operating Manual page 113

DP and DPR (final drilling depth)
The final drilling depth can be specified either absolute (DP) or relative (DPR) to the
reference plane.
With relative specification, the cycle will calculate the resulting depth automatically using the
positions of reference and retraction planes.
Note
If a value is entered both for DP and for DPR, the final drilling depth is derived from DPR. If
this differs from the absolute depth programmed via DP, the message "Depth:
Corresponding to value for relative depth" is output in the message line.
If the values for reference and retraction planes are identical, a relative depth specification is
not permitted. The error message 61101 "Reference plane defined incorrectly" is output and
the cycle is not executed. This error message is also output if the retraction plane is located
after the reference plane, i.e. its distance to the final drilling depth is smaller.
Turning Part 2: Programming (Siemens instructions)
Programming and Operating Manual, 05/2012, 6FC5398-5DP10-0BA0
Cycles
2.4 Drilling cycles
113