Siemens SIMATIC S5 Manual page 125

IP 266
Rotary axis:
When using a rotary axis, you may specify an absolute zero offset value outside
the boundaries of the positioning range.
Example: A continuous belt has a positioning range of 0 to 200 mm. The current
actual position is 150 mm.
An absolute zero offset of 300 mm changes the coordinate system
The current actual position is now 300 mm. The positioning range starts at
150 mm and the end of the positioning range is 350 mm.
The coordinate system was thus offset by the value
ZO - Actval
abs old
From this point on, all absolute target specifications must lie within the new
positioning range limits.
Act. position 0 mm = PS
150 mm 200 mm = PE
PS = Start of positioning range
PE = End of positioning range
Figure 5-24. Zero Offset for a Rotary Axis
You will find an overview of all zero offsets in those portions of Section 5.4 which
deal with G functions G53 to G57.
EWA 4NEB 812 6057-02
Machine Data, Modes and Traversing Programs
Absolute ZO
300 mm
Act. position
300 mm
150 mm = PS
350 mm = PE
5-53