Siemens SIMATIC FM 453 Manual page 244

Description of Functions
9.3.4 Zero Offset (Job No. 12)
Overview
You can use this function to shift the current zero point.
Function of
A selection, change or cancellation of a zero offset takes effect with the next
Zero offset positioning action. With a zero offset, the instantaneous shift of a coordinate
system is canceled, provided that a zero offset was already active and the
specified shift was executed (relatively). All coordinates and software limit
switches, the reference point and the actual value are updated accordingly.
Example of a zero offset:
Fig. 9-1
The zero offset can be deleted by:
9-44
Working range,
Machine
Start = 0
axis
Zero offset by –50
(shift of reference
point)
Working range,
Start = 50
–50
– Zero point
Zero Offset
Transmitting shift value = 0
Starting Reference-Point Approach mode
Set reference point
Eliminating axis synchronization (e.g. by a restart).
Target position
= 120
Actual
position =
100
Target
Working range,
position =
End = 250
120
Actual position
= 150
FM 453 Servo Drive / Step Drive Positioning Module
C79000-G7076-C453-01
Working range,
End = 200