Siemens SINUMERIK 808D ADVANCED Programming And Operating Manual page 126

See the following illustration for final drilling depth:
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.
Programming example: Drilling_centering
This program produces three drill holes using the CYCLE81 drilling cycle. The drilling axis is always the Z axis.
See the following example for drilling centering_drilling on turning center without tool:
N10 G0 G17 G90 F200 S300 M3
N20 D1 T3 Z110
N30 X0
N40 CYCLE81(110, 100, 2, 35,)
M30
126
; Specification of technology values
; Approach retraction plane
; Approach drilling position
; Cycle call with absolute end drilling depth, safety
clearance and incomplete parameter list
; Program end
Programming and Operating Manual (Turning)
6FC5398-5DP10-0BA2, 06/2015