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7 Utility Functions (Fn)
7-28
7.18 Origin Setting (Fn020)
This function is used to set the current position of an absolute linear scale as the origin (zero point position).
This function can be used with the following products.
Mitutoyo Corporation
ABS ST780A
series
Model: ABS ST78A/ST78AL
(1) Preparation
The following conditions must be met to set the origin.
• The write prohibited setting parameter (Fn010) mu
st be set to Write permitted (P.0000).
• The servo ON signal (/S-ON) must be OFF.
(2) Operating Procedure
Use the following procedure.
• After execution of origin setting, the servo ready (/S-RDY) signal will become inactive
because the system position data will have been changed. Always turn the power
supply OFF and then ON again after execution of origin setting.
• After execution of origin setting, the servo
motor phase data in the SERVOPACK will
be discarded. Execute polarity detection (Fn080) again to save the servomotor phase
data in the SERVOPACK.
Step
Display after Opera-
tion
Keys Operation
1 Press the MODE/SET Key to select the utility function.
2 Press the UP or DOWN Key to select
Fn020.
3
Press the DATA/SHIFT Key for
approximately one second.
The display shown on the left appears.
4
Press the UP Key until "O
SET5" is displayed.
Note:
If there is a mistake during key operations, "no_oP" will
flash for approximately one second and then "Fn000" will
be displayed again.
5
Press the MODE/SET Key to set the origin of the linear
sc
ale.
After the setting is completed, "donE" flash
es on the display
and the screen returns to the message shown on the left.
6
Press the DATA/SHIFT Key for appro
ximately one second.
"Fn020" is displayed again.
7 To enable the change in the setting, turn the power OFF and ON again.
MODE
SET
DATA
MODE
SET
DATA
MODE
SET
DATA
MODE
/
SET
DATA
/
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