
3.SAFETY FUNCTIONS B-63494EN/02
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Timing diagram from door close state to door open state
The following diagram shows the timings at which the door is opened
and closed again.
ORQ
*LGD
*LGD_P1
(Actual door unlock signal)
SGD_P
SGD2
Door closed
Door opened
(1) (2) (3) (4)
(5)
t
Door closed
ORQ_P
Actual door status
(1) When the guard open request signal (ORQ) is input, it checks
that the machine position and speed are within safe ranges. Then,
the guard unlock signal (*LGD) is turned on.
(2) When *LGD goes on, the Ladder program turns on the unlock
signal. This example assumes that the protective door has an
electromagnetic lock mechanism. While the door is open, the
unlock signal is turned off.
(3) The door is open.
(4) The protective door is closed and locked. After this, the guard
open request signal (ORQ) must be turned off.
(5) When ORQ goes off, the CNC turns *LGD off.
CAUTION
Reserve a time of 100 ms or longer (t in the figure)
from when the door is closed (locked) until the
guard open request signal (ORQ) goes off. If this
time requirement is not satisfied, an alarm may be
raised when the door is closed (locked). ガードオ
ープン要求信号(ORQ)をオンしている間は操作盤の
ランプを点灯するなどして作業者に知らせるよう
にしてください。