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6 MOTION PROGRAMS FOR POSITIONING CONTROL
6.13.17 G28 Home position return
Code G28
Function Home position return
When the home position return request is ON, the mid point
designation is ignored and a proximity dog, count, data set, dog
cradle, stopper or limit switch combined type home position return.
When the home position return request is OFF, the axis returns from
the current position to the home position through the specified mid
point at high-speed feed rate.
Format
2
Mid point coordinates
8XxGYyZz;
[Explanation]
(1) When the home position return request is ON, this command ignores a mid point
and returns the specified axis to the home position. When the home position
return request signal (M2409+20n) is OFF, this command positions the axis from
the current position to the home position through the specified mid point at high-
speed feed rate.
Home position return request signal (M2409+20n)
is ON
Home position
Mid point
Current position
(2) The home position return method is determined by the home position return data
at the home position return request ON.
(3) Be sure to set the axis which executes the home position return. The home
position return is not executed without setting.
(4) Be sure to set the mid point coordinates.
(5) The mid point data setting can be made by direct setting (numerical value) or
indirect setting (variable : #
).
(6) The tool length offset and virtual mechanical coordinates (Refer to Section
6.13.29.) of the axis which executed the home position are cancel.
Mid point designation depends on the position command system (G90, G91)
currently selected.