Siemens SINUMERIK 840Di sl Programming Manual page 124

Motion commands
4.2 Travel commands with polar coordinates, polar angle, polar radius
The polar angle can be defined both absolutely and incrementally.
When incremental coordinates are entered (AP=IC...), the last angle programmed is taken
as the reference. The polar angle is stored until a new pole is defined or the working plane is
changed.
If no pole is defined, then the origin of the current workpiece coordinate system is considered
as pole.
Polar radius RP
The polar radius remains stored until a new value is input.
If the modally active polar radius is RP = 0
The polar radius is calculated from the distance between the starting point vector in the polar
plane and the active pole vector. The calculated polar radius is stored modally afterwards.
This applies irrespective of a selected pole definition such as G110, G111, G112. If both
points are programmed identically, this radius becomes 0 and alarm 14095 is generated.
If a pole angle AP is programmed with RP = 0
If the current block contains a polar angle AP rather than a polar radius RP and if there is a
difference between the current position and pole in workpiece coordinates, then this
difference is applied as the polar radius and stored modally. If the difference = 0, the pole
coordinates are specified again and the modal polar radius remains zero.
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Programming Manual, 11/2006, 6FC5398-1BP10-2BA0
Fundamentals