Siemens SINUMERIK 840Di sl Function Manual page 65

Also in this case, the tool length offset must be cleared.
If a tool length offset is to remain active extending beyond a RESET, and a transformation
change of the tool carrier that can be oriented takes place, then Alarm 21665 "channel %1
$AA_TOFF[ ] reset" is output. In this case, the tool length offset is set to 0.
After POWER ON, all tool length offsets are set to 0.0.
The function is de-activated after POWER ON.
Behavior for the operating mode change and REPOS
The tool length offset remains active even when the operating mode is changed. The offset
can be executed in all modes - with the exception of JOG and REF.
If a tool length offset is interpolated on account of $AA_TOFF[ ] during mode change, the
mode change cannot take place until the interpolation of the tool length offset has been
completed. Alarm 16907 "Channel %1 action %2 <ALNX> possible only in stop state" is
output.
The tool length offset is also active during REPOS.
Boundary conditions
For an existing tool length offset, to avoid Alarm 21670 "Channel %1 block %2 inadmissible
change to the tool direction because $AA_TOFF active", then the following should be
observed:
• Deactivate transformation TROFOOF
• Change CP after PTP and PTP-travel in the mode JOG
• Geometry axis change and change of plane
• Block search
Synchronized actions
Function Manual, 11/2006, 6FC5397-5BP10-2BA0
A tool length offset must be cancelled before a transformation in the part program with
TOFFOF( ).
When changing over from CP to PTP a transformation is deactivated. A tool length offset
must be cleared before the changeover. If, when changing over to axis-specific manual
traverse in the JOG mode, a tool length offset is active, then a change to PTP is not
executed and alarm 21670 is issued. CP remains active until the tool length offset was
cleared using TOFFOF.
In case of geo-axis replacement, a tool length offset in the direction of the geometry axis
must be cleared beforehand via TOFFOF( ).
If a tool length offset is available when a plane is changed, then this must be cleared
beforehand via TOFFOF( ).
The instructions TOFFON( ) and TOFFOF( ) are not collected and output in an action block
during block search.
Detailed description
2.4 Actions in synchronized actions
65