Siemens SINUMERIK 828D Function Manual page 710

K2: Axis Types, Coordinate Systems, Frames
10.4 Coordinate systems
The following coordinate systems are defined:
MCS Machine Coordinat System
BCS Basic Coordinate System
BZS Basic Zero System
SZS Settable Zero System
WCS Workpiece Coordinate System
Interrelationships between coordinate systems
The coordinate systems are determined by the kinematic transformation and the FRAMES.
A kinematic transformation is used to derive the BCS from the MCS. If no kinematic transformation is active, the
BCS is the same as the MCS.
The basic frame maps the BCS onto the BKS.
An activated adjustable FRAME G54...G599 ENS is derived from the BNS.
The WCS, which is the basis for programming, is defined by the programmable FRAME.
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Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Basic Functions