Siemens SINUMERIK 840D sl Function Manual page 794

Brief description
1.2 Coordinate systems
SZS
The settable zero system (SZS) is the workpiece coordinate system with a programmable
frame from the viewpoint of the WCS. The workpiece zero is defined by the settable frames
G54 to G599.
WCS
The workpiece coordinate system (WCS) has the following properties:
• In the workpiece coordinate system all the axes coordinates are programmed (parts
• It is made up of geometry axes and special axes.
• Geometry axes always form a perpendicular Cartesian coordinate system
• Special axes form a coordinate system without any geometrical relation between the
• The names of the geometry axes and special axes can be defined.
• The workpiece coordinate system can be translated, rotated, scaled or mirrored with
Zero offset external
The zero offset external has the following properties:
• At a time defined in the PLC, a predefined additional zero offset between the basic and
• The magnitudes of the offsets can be set by the following for each of the axes involved:
• Activated offsets take effect at the instant the first motion block of the relevant axes is
• The activated offsets are retained after RESET and end of program.
• After POWER ON, the last active offset is still stored in the control but must be
10
program).
special axes.
FRAMES (TRANS, ROT, SCALE, MIRROR).
Multiple translations, rotational movements, etc., are also possible.
the workpiece coordinate systems is activated.
– PLC
– Operator Panel
– Part program
processed after offset activation. The offsets are superimposed on the programmed path
(no interpolation).
The velocity, at which the zero offset external is applied, is as follows:
Programmed F value plus +1/2 JOG velocity
The zero offset external is traversed at the end of G0 blocks.
reactivated by the PLC.
Basic logic functions: Axes, coordinate systems, frames (K2)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0