Siemens SINUMERIK 840DE Programming Manual page 501

Zero offset
Specification of a new reference point for a coordinate system through reference to an
existing zero point and a -> frame.
1. Adjustable
2. External
3. Programmable
Zero offset external
Zero offset specified by the -> PLC.
Fundamentals
Programming Manual, 10.2004 Edition, 6FC5 298-7AB00-0BP1
SINUMERIK 840D: A configurable number of adjustable zero offsets is available for each
CNC axis. The offsets, which can be selected via G functions are effective on an
alternating basis.
In addition to all the offsets, which define the position of the workpiece zero point, an
external zero offset can be overlaid by means of the handwheel (DRF offset) or from the
PLC.
Zero offsets are programmable for all path and positioning axes with the TRANS
command.
Glossary
Glossary-25