6.7 Zero Point Offset 2 - 4 - Siemens SIMATIC S5 Manual

Machining Programs and their Structure
1st reach, op. 2nd reach. op. 5th reach. op.
4 0
Fig. a20 Tool length offset
2.6.6.7 Zero Point Offset
You can program a relative displacement of the coordinate system of your axis during a machin-
ing program. This offset is added to offsets executed with mode BA12 ("zero offset absolute") or
BA13 ("zero offset relative").
I n machining programs, only one of the four offset values selected in the machine data can be ac-
tivated (G54...G57). If a second zero offset is activated, the first is no longer effective.
The direction of the offset depends on the sign in the machine data,
On completion of a machining program, the offsets activated in the machining program are auto-
matically switched off again, This is, however, not the case if the machining program stops owing
to an error message or because of a stop command. In this case, the basic coordinate system
can only be established again by clearing all offsets with operating mode BA14 ("clear zero off-
set"), G53 also clears offsets executed in subroutines.
2-42
Fig. 2/21 Tool length offset
Actual pos.