Siemens SIMATIC FM 453, Manual

Page: 244 / 380

9-44
FM 453 Servo Drive / Step Drive Positioning Module
C79000-G7076-C453-01
9.3.4 Zero Offset (Job No. 12)
You can use this function to shift the current zero point.
A selection, change or cancellation of a zero offset takes effect with the next
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:
Machine
axis Working range,
Start = 0
Target position
= 120 Working range,
End = 200
Zero offset by –50
(shift of reference
point)
Actual position
= 150
Working range,
End = 250
Working range,
Start = 50 Target
position =
120
– Zero point
Actual
position =
100
–50
Fig. 9-1 Zero Offset
The zero offset can be deleted by:
S
Transmitting shift value = 0
S
Starting Reference-Point Approach mode
S
Set reference point
S
Eliminating axis synchronization (e.g. by a restart).
Overview
Function of
Zero offset
Description of Functions