Siemens SINUMERIK 840Di sl Programming Manual page 119

Parameters
G110
G111
G112
X Y Z
AP=
RP=
Note
In the NC program you can switch non-modally between polar and Cartesian coordinates..
You come directly back into the Cartesian system by using the Cartesian coordinate
identifiers (X, Y, Z...). The defined pole is moreover retained up to program end.
Note
All the commands relating to pole input must be programmed in a separate NC block
If no pole is specified, the origin of the current coordinate system applies.
Fundamentals
Programming Manual, 11/2006, 6FC5398-1BP10-2BA0
4.2 Travel commands with polar coordinates, polar angle, polar radius
Polar programming relative to the last programmed setpoint position
Polar programming relative to origin of current workpiece coordinate
system
Polar programming relative to the last valid pole
Coordinate identifiers of the axes to be traversed
Polar angle, value range ±0...360°, angle refers to horizontal axis of
the working plane
Polar radius in mm or inches always in absolute positive values.
Motion commands
119