
4.REFERENCE POSITION ESTABLISHMENT B-63783EN-1/01
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4.7.1 Enhancement of Distance Coded Linear Scale
Overview
The distance coded linear scale interface can now be used for the
following controlled axes:
Rotation axis
Synchronization control axis
PMC control axis
In addition, the range of parameter No. 5227 that sets the distance from
the scale zero point to a reference position has been expanded.
- Distance coded rotary encoder
At a joint on the circle of a distance coded rotary encoder, the intervals
between reference marks and the settings in parameter Nos. 1896 and
5226 do not match. Accordingly, in movement passing this joint, a
reference position cannot be established (between a and b in Fig. 1)
Therefore, when the distance coded rotary encoder is used, and
reference position return is started from point A in the following figure
toward point B, a reference position is established again automatically
after point B is reached, then movement to point C takes place to
establish a reference position.
9.64
°
9.98
°
9.96
°
19.66
°
20.02
°
20.02
°
20.02
°
9.94
°
20.00
°
20.00
°
20.00
°
B
C
b
a
Fig.4.7.1 (a) Distance Coded Rotary Encoder
When the distance coded rotary encoder is used, and bit 1 (ROS) of
parameter No. 1006 is set to 1 (the machine coordinate system of the
rotation axis is of the rotation axis type), the reference position
established by this function is obtained from the travel amount per
rotation of the rotation axis even if the machine rotates through more
than one turn.