Siemens SIMATIC S5 Manual page 132

Machine Data, Modes and Traversing Programs
Example: The traversing range of a linear axis lies between the software limit
switches; a reference point has been set.
Software start limit switch:
Software end limit switch:
Traversing range is from - 500 mm to 700 mm.
Following a tool offset of 100 mm in a forward direction, these limits change as
follows:
Software start limit switch:
Software end limit switch:
The new range limits must be taken into account when specifying absolute target
positions.
You will find an overview of all TO options in Section 5.4.2 under the heading
"G Functions".
Rotary axis
The tool offset value must always be less than the difference between the
end of the traversing range and the start of the traversing range.
If the value is too high, it is rejected and an error message displayed.
A tool offset value that is within the permissible range modifies the actual posi-
tion by the tool offset value. This does not affect the traversing range, which
maintains its original range limits.
Example:
Traversing range prior to the TO
0 to 360°
5-60
- 500 mm
700 mm
- 400 mm
800 mm
Traversing range after a TO of 30°
IP 266
0 to 360°
EWA 4NEB 812 6057-02