
B–62073E–1/04 2. INTERFACE BETWEEN CNC AND PMC–NA OR NB
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(f) Reference position return end signals (ZP1, ZP2, ZP3,...)
[Classification]
Output signals
[Function] These signals report that the tool is at the reference position on a controlled axis.
These signals are provided for axes in a one–to–one correspondence. A number appended
to a signal represents a controlled axis number.
ZP1
1 ……Reference position return end signal for the first axis
2 ……Reference position return end signal for the second axis
3 ……Reference position return end signal for the third axis
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[Output Condition]
These signals go high when:
i. Manual reference position return is completed, and the current position is in the effective
area.
ii. Automatic reference position return (G28) is completed, and the current position is in the
effective area.
iii. Reference position return check (G27) is completed normally, and the current position
is in the effective area.
These signals go low when:
i. The tool has moved from the reference position.
ii. An emergency stop is applied.
iii. A servo alarm is raised.
(g) Second reference position return end signals (ZP21, ZP22, ZP23,...)
Third reference position return end signals (ZP31, ZP32, ZP33,...)
Fourth reference position return end signals (ZP41, ZP42, ZP43,...)
[Classification]
Output signals
[Function] The second, third, and fourth reference position end signals report the tool is at the second,
third, and fourth reference positions on a controlled axis, respectively. These signals are pro-
vided for axes in a one–to–one correspondence. A numeric character appended to the end
of a signal represents a controlled axis number, and a numeric character immediately follow-
ing ZP represents a reference position number.
Z P 2 1
1 ……Return end signal for the first axis
2 ……Return end signal for the second axis
3 ……Return end signal for the third axis
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2 ……End of second reference position return
3 ……End of third reference position return
4 ……End of fourth reference position return
[Output Condition]
These signals go high when:
i. The second, third, or fourth reference position return (G30) is completed, and the current
position is in the effective area.
These signals go low when:
i. The tool has moved from the reference position.
ii. An emergency stop is applied.
iii. A servo alarm is raised.