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8 OPR CONTROL
8.2.8 OPR method (6): Count method 2)
The following shows an operation outline of the "method 2)" OPR method.
The "count method 2)" method is effective when a "zero signal" cannot be received.
(Note that compared to the "count method 1)" method, using this method will result in
more deviation in the stop position during machine OPR.)
The machine OPR is started.
(The machine begins the acceleration designated in "
1)
direction designated in "
acceleration is completed.)
2)
The machine begins decelerating when the near-point dog ON is detected.
3)
The machine decelerates to the "
The pulse output from the QD75 will stop and the machine OPR will be completed when the machine
moves the movement amount set in "
4)
from the near-point dog ON position.
Machine OPR start
(Positioning start signal)
OPR request flag
[ Md.31 Status : b3]
OPR complete flag
[ Md.31 Status : b4]
Md.26 Axis operation status Standing by
Md.34 Movement amount
after near-point dog ON
Md.20 Current feed value
Md.21 Machine feed value
Operation chart
Pr.44
OPR direction". It then moves at the "
Pr.47
Pr.50
Pr. 46 OPR speed
V
Near-point dog
ON
OFF
ON
OFF
OFF
In OPR
Inconsistent
0
Inconsistent
Value the machine moved is stored
Fig. 8.14 Count method 2) machine OPR
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Pr.51
OPR acceleration time selection", in the
Creep speed", and subsequently moves at that speed.
Setting for the movement amount after near-point dog ON "
Pr.50 Setting for the movement amount
after near-point dog ON
Pr. 47 Creep speed
t
Md.34 Movement amount after near-point dog ON
Leave sufficient distance from the OP
position to the near-point dog OFF
ON
OFF
ON
Standing by
1
Value of
OP address
8 - 18
MELSEC-Q
Pr.46
OPR speed" when the
.
1
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