
3.MANUAL OPERATION OPERATION B-63944EN/02
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3.9.2 Reference Position Return
(1) When the reference position is not established and the axis
moved by turning the feed axis direction signal
(+J1,-J1,+J2,-J2,...) to "1" in REF mode, the reference position
establishment procedure is executed.
(2) When the reference position is already established and the axis is
moved by turning the feed axis direction signal
(+J1,-J1,+J2,-J2,...) to "1" in REF mode, the axis is moved to the
reference point without executing the reference position
establishment procedure.
(3) When the reference position is not established and the reference
position return command (G28) is executed, the reference
position establishment procedure is executed. The next
movement the axis depends on the setting of parameter RFS
(No.1818#0).
(4) When the reference position is already established and the
reference position command (G28) is executed, the movement of
the axis depends on the setting of parameter RF2 (No.1818#1).
3.9.3 Distance Coded Rotary Encoder
In case of setting a rotary axis, if a parameter DCRx (No. 1815#3) is
set, the setting axis is regarded as being equiped with a distance coded
rotary encoder.
In case of distance coded rotary encoder, the marker interval may be
different from parameter setting value. (a-b section of the following
figure) When the reference point return is executed through this
section, it is not able to establish the reference point. Therefore, in
case of distance coded rotary encoder, if the reference point return is
started for B point from A point of below figure, the reference point is
not established yet at B point. The reference point return is re-started
for C point. The reference point return procedure is finished at C
point.
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b
a
• When the reference point return procedure is executed, the
coordinate value are rounded in 0 to 360 degree, even if Machine
coordinate values are linear axis type.