Positioning; Zero Offset - Siemens SIMATIC S7-300 Manual

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 zero
A selection, change or cancellation of a zero offset takes effect with the next
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, Target posi-
Start = 50 tion = 120
–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 posi- Working range,
tion = 120 End = 200
Actual
position =
100
Working range,
End = 250
Actual posi-
tion = 150
FM 354 Servo Drive Positioning Module