Mitsubishi Electric MELSERVO-J4 Series Instruction Manual page 197

4. HOW TO USE THE POINT TABLE
The following shows the relation between the stop interval at the home position return and the linear
encoder resolution. For example, when the linear encoder resolution is 0.001 μm and the parameter
for the stop interval at the home position return, [Pr. PL01], is set to "_ 5 _ _" (16777216 pulses), the
stop interval is 16.777 mm. The value inside a bold box indicates the recommended stop interval for
each linear encoder resolution.
Linear encoder
resolution [µm]
Pr. PL01
Stop interval
[pulse]
_ 0 _ _ 8192
_ 1 _ _ 131072
_ 2 _ _ 262144
_ 3 _ _ 1048576
_ 4 _ _ 4194304
_ 5 _ _ 16777216
_ 6 _ _ 67108864
In the case of a dog type home position return, after the proximity dog signal rear end is detected,
the nearest home position reference position shifted by the home position shift distance is used as
the home position.
Set one linear encoder home position in the full stroke, and set it in the proximity dog signal
detection position.
When two or more reference marks exist during the full stroke of the linear encoder, select "Enabled
(1 _ _ _)" of "Linear scale multipoint Z-phase input function selection" in [Pr. PC28].
Linear servo motor
speed
Proximity dog
signal
Reference home
position
Linear servo motor
position
Note 1. Changeable with [Pr. PL01].
0.001 0.005 0.01 0.02
0.008 0.041 0.082 0.164
0.131 0.655 1.311 2.621
0.262 1.311 2.621 5.243
1.049 5.243 10.486 20.972
4.194 20.972 41.943 83.886
16.777 83.886 167.772 335.544
67.109 335.544 671.089 1342.177
Home position return speed
0 mm/s
ON
OFF
Linear encoder home position
2. Home position shift distance can be changed with [Pr. PT07] and [Pr. PT69].
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0.05 0.1 0.2
0.410 0.819 1.638
6.554 13.107 26.214
13.107 26.214 52.429
52.429 104.858 209.715
209.715 419.430 838.861
838.861 1677.722 3355.443
3355.443 6710.886 13421.773 33554.432 67108.864 134217.728
Home position return direction
Creep speed
1048576 pulses (Note 1)
1048576 pulses × n + Home position shift distance
(Note 2)
4 - 70
[Unit: mm]
0.5 1 2
4.096 8.192 16.384
65.536 131.072 262.144
131.072 262.144 524.288
524.288 1048.576 2097.152
2097.152 4194.304 8388.608
8388.608 16777.216 33554.432
Home position shift distance
Home position