
PROGRAMMING
6. REFERENCE POSITION
B–63444EN/01
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Positioning to the intermediate or reference positions are performed at the
rapid traverse rate of each axis.
Therefore, for safety, the tool length compensation should be cancelled
before executing this command.
The coordinates for the intermediate position are stored in the controller
only for the axes for which a value is specified in a G28 block. For the
other axes, the previously specified coordinates are used.
Example N1 G28 X40.0 ; Intermediate position (X40.0)
N2 G28 Z60.0 ; Intermediate position (X40.0, Z60.0)
G27 command positions the tool at rapid traverse rate. If the tool reaches
the reference position, the reference position return lamp lights up.
However, if the position reached by the tool is not the reference position,
an alarm (No. 092) is displayed.
Before a machine coordinate system is established with the first reference
position return after power–on, the manual and automatic reference
position return feedrates and automatic rapid traverse rate conform to the
setting of parameter No. 1428 for each axis. Even after a machine
coordinate system is established lupon the completion of reference
position return, the manual reference postiion return feedrate conforms to
the setting of the parameter.
NOTE
1 To this feedrate, a rapid traverse override (F
0
,25,50,100%)
is applied, for which the setting is 100%.
2 After a machine coordinate system has been established
upon the completion of reference position return, the
automatic reference position return feedrate will conform to
the ordinary rapid traverse rate.
3 For the manual rapid traverse rate used before a machine
coordinate system is established upon the completion of
reference position return a jog feedrate or manual rapid
traverse rate can be selected usting RPD (bit 0 of parameter
No. 1401).
Before a coordinate
system is established
After a coordinate
system is established
Automatic reference posi-
tion return (G28)
No. 1428 No.1420
Automatic rapid traverse
(G00)
No.1428 No.1420
Manual reference position
return
No.1428 No.1428
Manual rapid traverse rate No.1423 *1 No.1424
Explanations
D Reference position
return (G28)
D Reference position
return check (G27)
D Setting of the reference
position return feedrate