CHAPTER 3 MAINTENANCE
4. Absolute Position Detection
III
– 13
4.2 Starting up absolute position detection
(1) When the absolute position basic point has not been established.
When the zero point has not been initialized, or when the absolute position has been lost after
initialization, an error or warning will occur.
In this state, the coordinate system will not be set, so limits will be applied in each modoe. Thus,
carry out zero point initialization to establish the coordinate system.
Absolute position detection method
Operation mode
Dog-type Dogless-type
General movement
commands
Not possible
(Note 1)
Not
possible
(Note 2)
Memory, tape, MDI
G28 Possible
Not possible
(Note 2)
JOG feed, rapid traverse, handle, stop
Possible
Possible
Reference point return
Possible
Not possible
(Note 1)
The program error "PR0430 Return incomplete axis exists" will occur.
(Note 2)
Automatic start is not possible.
(2) Selecting the zero point initialization method
Select the zero point initialization method with the following parameters.
130041 Abs on
∗
(Axis spec param screen)
0: Incremental position detection
1: Absolute position detection (dog-type)
2: Absolute position detection (dogless-type)
270005 No stopper
(Zero point set screen)
0: Machine end stopper method
1: Marked point alignment method
270008 Ref posn type
(Zero point set screen)
0: The machine end or marked point is set as the
absolute position basic point.
1: The grid point is set as the absolute position
basic point.
(3) Setting other machine parameters
The following parameters must be set in addition to those in item (2).
150004 Grspc
(Z-point rtn param screen)
Set the grid interval with mm unit.
160017 SPEC
∗
(Servo param screen)
Set the absolute position detection valid bit (bit 7) to
"1".
Set as a hexadecimal.
(4) Initializing the zero point
Refer to the explanations given in sections 4.3 to 4.5 and initialize the zero point.
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