
B–64113EN–1/01
4. REFERENCE POSITION ESTABLISHMENT
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The reference position establishment procedure is explained below.
<1> The tool is fed along a specified axis at the reference position return
FL feedrate (parameter No. 1425).
<2> Upon detection of a reference mark on the scale, the tool is stopped
briefly then fed at the reference position return FL feedrate.
<3> Step <2> above is repeated until three or four reference marks are
detected on the scale. Then, the reference position is established,
and the reference position established signal (ZRF1, ZRF2, ZRF3,
etc.) is set to 1.
<4> The tool is fed to a specified end point at a rapid traverse rate.
A time chart for the above procedure is shown below.
ZRFn
G00 command
Reference mark
Feedrate
Rapid traverse rate
FL feedrate
Time
Fig. 4.8 (b) Time chart for reference position establishment (G00)
The specifications for the steps of detecting reference marks and
establishing the reference position (steps <1> to <3> above) are the same
as for the conventional linear scale with absolute addressing reference
marks. The restrictions are also the same.
For details, see Section 4.7, ”Linear Scale I/F with Absolute Address
Referenced Mark (A/B Phase)/Linear Scale with Distance–Coded
Reference Marks (Serial)”.
The tool path in the G00 command is explained below.
(1)When no axis requires the reference position establishment operation
When the reference position has already been established for all
specified axes, the reference position establishment operation is not
performed.
For example, suppose that the reference position is already established
for the X–, Y–, and Z–axes, and that G00 Xxx Yyy ZZz; is specified.
Then, normal rapid traverse operation takes place. The tool path
follows the setting in bit 1 (LRP) of parameter No. 1401.
D Operation
D Tool path