Siemens SIMOTION Function Manual page 14

Overview of Path Interpolation
1.2 Terminology
Object coordinate system (OCS)
As of SIMOTION V4.1.2, in addition to the base coordinate system (BCS), object coordinate
systems (OCS) with the path object are also available. Path motions can be specified either
in the BCS or in the OCS. The object coordinate systems are defined in their reference
position using frame transformations for the BCS. They can be coupled with a specified
motion value in the x direction of the OCS on the TrackingIn interface.
OCS reference position
Position of the OCS for the motion sequence value equal to zero. The OCS reference
position for the BCS is defined using a frame transformation.
Polynomial path
Path in 2D or 3D that describes a polynomial segment.
Synchronous motion, path-synchronous motion
Synchronous coupling of an axis with a path motion; output on a positioning axis
TrackingIn interface
The trackingIn input interconnection interface of the path object can be interconnected with
another TO that provides an output interface with motion information. This can be, for
example, the motion setpoint or actual value of an axis or the actual value of an external
encoder.
14
TO Path Interpolation
Function Manual, 11/2010