Siemens SINUMERIK 840D sl Function Manual page 1901

Figure 2-47
Example
On the machine in the figure, the rotary axis of the table is pointing in the positive Y direction.
The table is rotated by +45 degrees. PAROT defines a frame, which similarly describes a
rotation of 45 degrees about the Y axis. The coordinate system is not rotated relative to the
actual environment (marked in the figure with "Position of the coordinate system after
TCARR"), but is rotated by -45 degrees relative to the defined coordinate system (position
after PAROT). If this coordinate system is defined with ROT Y-45, for example, and if the
toolholder is then selected with active TCOFR, an angle of +45 degrees will be determined for
the rotary axis of the toolholder.
Rotary table
With rotary tables (kinematic types P and M), activation with TCARR similarly does not lead to
an immediate rotation of the coordinate system (see figure), i.e., even though the zero point
of the coordinate system is offset relative to the machine, while remaining fixed relative to
the zero point of the workpiece, the orientation remains unchanged in space.
Basic logic functions: Tool Offset (W1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
Zero offset on activation of a rotary table with TCARR
Detailed Description
2.5 Toolholder with orientation capability
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