Description of Functions
9-47
FM 353 Stepper Drive Positioning Module
6ES7 353-1AH01-8BG0
Example of a zero offset:
Machine
axis
Working range,
Start = 0
Target posi-
tion = 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 posi-
tion = 120
− Zero point
Actual posi-
tion = 100
−50
Workpiece
coordinates
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).
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° After shift value = −50°
Actual value 350°
Actual value
40°
Range start/
Range end 0/360°
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.
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