Frame Chain And Coordinate Systems; Overview - Siemens SINUMERIK 840D sl Function Manual

K2: Axis Types, Coordinate Systems, Frames
10.5 Frames
● All channels of an NCU can read and write NCU-global frames equally.
● As the assignment of machine axes to channel axes and, in particular, to geometry axes,
can be different in all channels, there is consequently no unique cross-channel geometric
relationship between the channel axes. Therefore, only offset, scaling and mirroring is
possible for NCU-global frames. Rotations are not possible.
Note
Program coordination
The coordination of channel-specific accesses to NCU-global frames is the sole responsibility
of the user. It is recommended that the commands for the program coordination be used.
References
Programming Manual, Job Planning; Section "Flexible NC programming" > "Program
coordination (INIT, START, WAITM, WAITMC, WAITE, SETM, CLEARM)"
10.5.4

Frame chain and coordinate systems

10.5.4.1

Overview

The figure below shows the frame chain for the current complete frame. The frame chain is
located between the basic coordinate system (BCS) and the workpiece coordinate system
(WCS).
The settable zero system (SZS) corresponds to the WCS transformed by the programmable
frame. The basic zero system (BZS) still includes the current settable frame. The system frame
for the external work offset exists only if it has been configured. Otherwise, the external work
offset is traversed as overlaid movement of the axis.
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Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions