Machine Data and Incremental Dimensions
8-20
FM 351 Positioning Module
C79000-G7076-C351-02
Example of Absolute Encoder Adjustment
In the example, the following is assumed:
• Reference point coordinate = –125 mm
• Working range of SSW_STRT = – 1000 mm to SSW_END = 1000 mm
• Absolute encoder adjustment = 0
• Encoder range = 2048 increments with a resolution of 1 mm/pulse
• The absolute encoder used cannot be exactly adjusted mechanically and also
does not have the option of setting the encoder value.
Axis
–1000 0
Value of absolute encoder
2047
–125
Axis
–1000 10000–125
Encoder value 0
Current
Encoders
Desired
1)
2)
1)
Correlation between the coordinate system and the encoder values with the set abso-
lute encoder adjustment. The encoder value 0 corresponds to the actual value -125.
Required correlation of the coordinate system with the encoder. At this position the
coordinate should be -125.
2)
0
Actual value
Result After Setting the Reference Point
After “set reference point”, the relationship is as follows:
The reference point coordinate on the axis (-125) is assigned to the encoder value
(1798) calculated from the absolute encoder adjustment.
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