Siemens SIMATIC FM 353 Manual page 247

Example of a zero offset:
Machine
axis
Zero offset by −50
(shift of reference
point)
Workpiece
coordinates
Fig. 9-1
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).
Rotary axis
The following restriction applies to a rotary axis:
Zero offset < Rotary-axis range. The actual value is normalized.
Example:
Range start/Range end 0/360°
Actual value 350°
The start and end of the range are shifted −50°.
Exceptions:
In the Incremental Relative, MDI and Automatic modes, a zero offset is not pos-
sible until the block has been processed (position reached, programmed stop set),
i.e. it is not possible when the axis is stationary after execution is interrupted with
an abnormal stop.
FM 353 Stepper Drive Positioning Module
6ES7 353-1AH01-8BG0
Working range,
Start = 0
Working range,
Start = 50
−50
− Zero point
Zero offset
Target posi-
tion = 120
Actual posi-
tion = 100
Target posi-
tion = 120
Actual position
= 150
After shift value = −50°
Actual value
Range start/
Range end 0/360°
Description of Functions
Working range,
End = 200
Working range,
End = 250
40
°
9-47