Siemens SINUMERIK 840D sl Programming Manual page 857

RMIBL DISPR=... or RME DISPR=... allows you to select a repositioning point which lies
before the interruption point or the block end point.
DISPR=... allows you to describe the contour distance in mm/inch between the repositioning
point and the interruption before the end point. Even for high values, this point cannot be further
away than the block start point.
If no DISPR=... command is programmed, then DISPR=0 applies and with it the interruption
point (with RMIBL) or the block end point (with RMEBL).
DISPR sign
The sign of DISPR is evaluated. In the case of a plus sign, the behavior is as previously.
In the case of a minus sign, approach is behind the interruption point or, with RMBBL, behind
the block start point.
The distance between interruption point and approach point depends on the value of DISPR.
Even for higher values, this point can lie in the block end point at the maximum.
Application example:
A sensor will recognize the approach to a clamp. An ASUB is initiated to bypass the clamp.
Afterwards, a negative DISPR is repositioned on one point behind the clamp and the program
is continued.
NC programming
Programming Manual, 12/2019, 6FC5398-2EP40-0BA0
Work preparation
3.14 Path traversing behavior
857