Channel-Specific Frames ($P_Chbfr, $P_Ubfr) - Siemens SINUMERIK 840D sl Programming Manual

Work preparation
3.8 Coordinate transformations (frames)
Geometrical relationships and frame chains
With global frames there is no geometrical relationship between the axes. It is therefore not
possible to perform rotations or program geometry axis identifiers.
Rotations cannot be used on global frames. The programming of a rotation is denied with alarm
18310 "Channel %1 Block %2 Frame: rotation not allowed".
It is possible to chain global frames and channel-specific frames. The resulting frame contains
all frame components including the rotations for all axes. The assignment of a frame with
rotation components to a global frame is denied with alarm "Frame: rotation not allowed".
Global frames
Global basic frames $P_NCBFR[n]
Up to eight global basic frames can be configured:
Channel-specific basic frames can also be available.
Global frames can be read and written from all channels of a control. When writing global
frames, the user must ensure channel coordination. This can be implemented, for example,
through wait markers (WAITMC).
Note
Machine manufacturer
The number of global basic frames is configured via the machine data.
Further information: Function Manual Basic Functions
Settable frames ($P_UIFR[n])
All settable frames G500, G54...G599 can be configured either globally or channel-specifically.
Note
Machine manufacturer
All settable frames can be reconfigured as global frames with the aid of machine data
MD18601 $MN_MM_NUM_GLOBAL_USER_FRAMES.
Channel axis identifiers and machine axis identifiers can be used as axis identifiers in frame
program commands. Programming the geometry identifiers is rejected with an alarm.
3.8.8.1

Channel-specific frames ($P_CHBFR, $P_UBFR)

Settable frames or basic frames can be read and written via the part program and via the OPI
by the operator and by the PLC.
The fine offset can also be used for global frames. Global frames are suppressed in the same
way as channel-specific frames, via G53, G153, SUPA and G500.
Machine manufacturer
648
Programming Manual, 12/2019, 6FC5398-2EP40-0BA0
NC programming