Yaskawa YASNAC PC NC I/O Signal Function Manual - Manual (Page 41)

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YASNAC PCNC I/O Signal Function Manual Chapter 5: Coordinate Systems
(d) At the third reference point output signal
In automatic operation, when an axis is positioned at the third reference point through the
execution of the “G30 P3” command in a part program, the corresponding output signals
(3ZPX to 3ZP5) are closed indicating that the axis is at the third reference point.
(e) At the fourth reference point output signal
In automatic operation, when an axis is positioned at the fourth reference point through the
execution of the “G30 P4” command in a part program, the corresponding output signals
(4ZPX to 4ZP5) are closed indicating that the axis is at the fourth reference point.