MITSUBISHI ELECTRIC MELSERVO MR-J2S- A - Manual (Page 329)

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15. ABSOLUTE POSITION DETECTION SYSTEM
If the address of the machine home position is changed to any coordinate value other than "0", the
programmable controller coordinate system will be as illustrated below.
The power should be turned ON/OFF in the range in which the address increases on moving away
from the home position.
0 20000
20000 30000 70000
50000 0
20000 30000 70000
50000 20000
0 0
Machine home position Home position
Programmable
controller coordinate
system
ABS
coordinate
system
a) If revolution direction parameter (Pr. 14) 0
Programmable
controller coordinate
system
ABS
coordinate
system
Direction in which
address increases Direction in which
address increases
Machine home position Home position
Absolute position data can be detected Absolute position data can be detected
ABS coordinate value error occurs if
power is turned on within this range ABS coordinate value error occurs if
power is turned on within this range
* Home position address changed to "2000" * Home position address changed to "2000"
b) If revolution direction parameter (Pr. 14) 1
(c) In a positioning program, the address of the positioning point should be determined by adding the
home position address to the target position address.
Example) After home position return, execute positioning at 1) to 3).
1) Positioning at position address 80000
(PC coordinate 140000)
2) Positioning at position address 130000
(PC coordinate 190000)
3) Positioning at position address 0
(PC coordinate 60000)
0
50000
10000 50000
0
100000
50000
60000 150000
1)
(80000 60000)
2)
(130000 60000)
(0 60000)
3)
ABS coordinate
error region
Programmable
controller
coordinate
system
ABS coordinate
system
Mechanical limit
Machine home position Home position (operation home
Stroke limit
* Home position address changed to "50000"
If revolution direction parameter (Pr. 14) 0
Direction in which
address increases
position)