Siemens SINUMERIK 880 Programming Manual page 93

01.93
Programming of fictitious axes is not permissible in reset position (G130, G230, G330). When
transformation is selected, no real axes used for transformation may be programmed.
Each selection/deselection of transformations requires the function "Empty buffer" (@714).
This function is initiated internally by the block preparation.
On selection/deselection of transformations, all axes must once be programmed with G90 if
compensating values have previously been allowed for (zero offsets, tool offsets ...).
Before activating the transformation, CRC and TNRC must be deselected. A transformation is
always assigned permanently to a channel.
The plane definition in the channel-specific machine data applies to the real system. On
selection of a transformation, a plane is set for the fictitious system.
The fictitious plane is defined in the transformation data by assigning fictitious axes. Deviations
from the basic planes can be programmed with G16. With TRANSMIT, the initial plane setting
is defined as G17. G17 is set automatically after transformation has been selected. After its
deselection, an automatic reset is made to the plane which was effective before transformation
selection. Parallel transformations in different channels must not act on the same axes.
The transformation must not be selected or deselected in a contour block sequence.
In the blocks after selection and deselection of the transformation, absolute dimensioning
(G90) is required.
If a block search is used in the program the following must be observed:
• The real axes involved in the transformation must not be in a position which corresponds
to the origin of the fictitious coordinate system when the block search is initiated.
• The path from the position before the start of the block search to the final position of the
block to be searched for must not lead through the origin.
Note:
• With TRANSMIT the programmed path speed is reduced such that the maximum speed of
rotation of the rotary axis is not exceeded. This is especially the case for movements near
the turning centre.
In rapid traverse the speed is also reduced if the rotary axis is not involved in the
movement (applies to SINUMERIK 880, SW6 only).
• In JOG the feedrate reduction can only partially take effect, because the final position of
the movement is not known. In this case drops in feedrate might occur.
• The use of an angle head cutter in TRANSMIT is only possible to a limited degree, block
search causes an alarm.
© Siemens AG 1991 All Rights Reserved
SINUMERIK 880, (PG)
4.2.10 Transformation of coordinates TRANSMIT, G131,G231,G331
6ZB5 410-0HD02
4 Programming of Motion Blocks
4–35